Click below to expand and view problems.
Arrays
- https://leetcode.com/problems/3sum/
Medium - https://leetcode.com/problems/add-to-array-form-of-integer/
Easy - https://leetcode.com/problems/all-divisions-with-the-highest-score-of-a-binary-array/
Medium - https://leetcode.com/problems/build-array-from-permutation/
Easy - https://leetcode.com/problems/cells-with-odd-values-in-a-matrix/
Easy - https://leetcode.com/problems/check-if-every-row-and-column-contains-all-numbers/
Easy - https://leetcode.com/problems/check-if-the-sentence-is-pangram/
Easy - https://leetcode.com/problems/combination-sum/
Medium - https://leetcode.com/problems/concatenation-of-array/
Easy - https://leetcode.com/problems/contiguous-array/
Medium - https://leetcode.com/problems/count-elements-with-strictly-smaller-and-greater-elements/
Easy - https://leetcode.com/problems/count-items-matching-a-rule/
Easy - https://leetcode.com/problems/create-target-array-in-the-given-order/
Easy - https://leetcode.com/problems/determine-whether-matrix-can-be-obtained-by-rotation/
Easy - https://leetcode.com/problems/find-all-lonely-numbers-in-the-array/
Medium - https://leetcode.com/problems/find-first-and-last-position-of-element-in-sorted-array/
Medium - https://leetcode.com/problems/find-first-palindromic-string-in-the-array/
Easy - https://leetcode.com/problems/find-n-unique-integers-sum-up-to-zero/
Easy - https://leetcode.com/problems/find-numbers-with-even-number-of-digits/
Easy - https://leetcode.com/problems/find-the-highest-altitude/
Easy - https://leetcode.com/problems/flipping-an-image/
Easy - https://leetcode.com/problems/house-robber/
Medium - https://leetcode.com/problems/how-many-numbers-are-smaller-than-the-current-number/
Easy - https://leetcode.com/problems/intersection-of-two-arrays-ii/
Easy - https://leetcode.com/problems/jump-game/
Medium - https://leetcode.com/problems/keep-multiplying-found-values-by-two/
Easy - https://leetcode.com/problems/kids-with-the-greatest-number-of-candies/
Easy - https://leetcode.com/problems/kids-with-the-greatest-number-of-candies/
Easy - https://leetcode.com/problems/lucky-numbers-in-a-matrix/
Easy - https://leetcode.com/problems/majority-element/
Easy - https://leetcode.com/problems/matrix-diagonal-sum/
Easy - https://leetcode.com/problems/matrix-diagonal-sum/
Easy - https://leetcode.com/problems/maximize-distance-to-closest-person/
Medium - https://leetcode.com/problems/maximum-population-year/
Easy - https://leetcode.com/problems/maximum-subarray/
Easy - https://leetcode.com/problems/median-of-two-sorted-arrays/
Hard - https://leetcode.com/problems/merge-sorted-array/
Easy - https://leetcode.com/problems/minimum-swaps-to-group-all-1s-together-ii/
Medium - https://leetcode.com/problems/number-of-good-pairs/
Easy - https://leetcode.com/problems/number-of-smooth-descent-periods-of-a-stock/
Medium - https://leetcode.com/problems/partition-array-according-to-given-pivot/
Medium - https://leetcode.com/problems/pascals-triangle/
Easy - https://leetcode.com/problems/permutations-ii/
MediumRecursion - https://leetcode.com/problems/plus-one/
Easy - https://leetcode.com/problems/product-of-array-except-self/
Medium - https://leetcode.com/problems/rearrange-array-elements-by-sign/
Medium - https://leetcode.com/problems/remove-duplicates-from-sorted-array/
Easy - https://leetcode.com/problems/reshape-the-matrix/
Easy - https://leetcode.com/problems/richest-customer-wealth/
Easy - https://leetcode.com/problems/rotate-array/
Medium - https://leetcode.com/problems/running-sum-of-1d-array/
Easy - https://leetcode.com/problems/set-matrix-zeroes/
Medium - https://leetcode.com/problems/shuffle-the-array/
Easy - https://leetcode.com/problems/sort-colors/
Medium - https://leetcode.com/problems/spiral-matrix-ii/
Medium - https://leetcode.com/problems/largest-positive-integer-that-exists-with-its-negative/
Medium - https://leetcode.com/problems/valid-mountain-array/
Easy - https://leetcode.com/problems/find-all-k-distant-indices-in-an-array/
EasyRecommended - https://leetcode.com/problems/get-the-maximum-score/
Hard - https://leetcode.com/problems/count-number-of-pairs-with-absolute-difference-k/
Easy - https://leetcode.com/problems/next-permutation/
Medium - https://leetcode.com/problems/3sum-with-multiplicity/
Medium - https://leetcode.com/problems/baseball-game/
Easy - https://leetcode.com/problems/shift-2d-grid/
Easy - https://leetcode.com/problems/game-of-life/
Medium - https://leetcode.com/problems/move-zeroes/
Easy - https://leetcode.com/problems/find-the-k-beauty-of-a-number/
Easy - https://leetcode.com/problems/squares-of-a-sorted-array/
Easy - https://leetcode.com/problems/pascals-triangle-ii/
Easy - https://leetcode.com/problems/partition-array-such-that-maximum-difference-is-k/
Medium - https://leetcode.com/problems/calculate-amount-paid-in-taxes/
Easy - https://leetcode.com/problems/check-if-matrix-is-x-matrix/
Easy - https://leetcode.com/problems/convert-1d-array-into-2d-array/
Easy - https://leetcode.com/problems/rotate-image/
Medium - https://leetcode.com/problems/island-perimeter/
Easy - https://leetcode.com/problems/diagonal-traverse/
Medium - https://leetcode.com/problems/diagonal-traverse/
Medium - https://leetcode.com/problems/alphabet-board-path/
Medium - https://leetcode.com/problems/the-employee-that-worked-on-the-longest-task/
Easy - https://leetcode.com/problems/largest-positive-integer-that-exists-with-its-negative/
Easy - https://leetcode.com/problems/check-if-two-string-arrays-are-equivalent/
Easy - https://leetcode.com/problems/print-words-vertically/
Medium - https://leetcode.com/problems/max-consecutive-ones/
Easy - https://leetcode.com/problems/shortest-distance-to-target-string-in-a-circular-array/
Easy - https://leetcode.com/problems/delete-columns-to-make-sorted/description/
Easy - https://leetcode.com/problems/decompress-run-length-encoded-list/
Easy - https://leetcode.com/problems/shuffle-an-array/
Medium - https://leetcode.com/problems/row-with-maximum-ones/
Easy - https://leetcode.com/problems/watering-plants/
Medium - https://leetcode.com/problems/subrectangle-queries/
Medium
Bit Manipulation
- https://leetcode.com/problems/binary-number-with-alternating-bits/
Easy - https://leetcode.com/problems/number-of-steps-to-reduce-a-number-to-zero/
Easy - https://leetcode.com/problems/single-number/
Easy - https://leetcode.com/problems/check-if-a-string-contains-all-binary-codes-of-size-k/
Medium - https://leetcode.com/problems/maximum-product-of-word-lengths/
Medium - https://leetcode.com/problems/divide-two-integers/
Medium - https://leetcode.com/problems/longest-nice-subarray/
Medium - https://leetcode.com/problems/longest-subarray-with-maximum-bitwise-and/
Medium - https://leetcode.com/problems/decode-xored-array/description/ ```Easy``
- https://leetcode.com/problems/number-of-steps-to-reduce-a-number-to-zero/
Easy - https://leetcode.com/problems/xor-operation-in-an-array/description/
Easy - https://leetcode.com/problems/find-the-original-array-of-prefix-xor/
Medium - https://leetcode.com/problems/binary-number-with-alternating-bits/
Medium - https://leetcode.com/problems/gray-code/
Medium - https://leetcode.com/problems/single-number-ii/description/
Medium - https://leetcode.com/problems/find-xor-sum-of-all-pairs-bitwise-and/ ``Hard```
- https://leetcode.com/problems/hamming-distance/
Easy - https://leetcode.com/problems/bitwise-and-of-numbers-range
Medium
Backtracking
- https://leetcode.com/problems/generate-parentheses/
Medium - https://leetcode.com/problems/combination-sum/
Medium - https://leetcode.com/problems/combination-sum-ii/
Medium - https://leetcode.com/problems/n-queens/
Hard - https://leetcode.com/problems/n-queens-ii/
Hard - https://leetcode.com/problems/combinations/
Medium - https://leetcode.com/problems/matchsticks-to-square```Medium```
- https://leetcode.com/problems/maximum-rows-covered-by-columns/
Medium - https://leetcode.com/problems/sudoku-solver/
Hard - https://leetcode.com/problems/subsets-ii/
Medium - https://leetcode.com/problems/find-xor-beauty-of-array/
Medium - https://leetcode.com/problems/restore-ip-addresses/
Medium - https://leetcode.com/problems/the-number-of-beautiful-subsets/
Medium - https://leetcode.com/problems/additive-number/
Medium - https://leetcode.com/problems/letter-tile-possibilities/
Medium - https://leetcode.com/problems/number-of-ways-to-reorder-array-to-get-same-bst/
Hard
Design
- https://leetcode.com/problems/design-an-atm-machine/
Medium - https://leetcode.com/problems/min-stack/
Easy - https://leetcode.com/problems/design-hashset/
Easy - https://leetcode.com/problems/design-hashmap/
Easy - https://leetcode.com/problems/encode-and-decode-tinyurl/
Medium - https://leetcode.com/problems/peeking-iterator/
Medium - https://leetcode.com/problems/implement-stack-using-queues/
Easy - https://leetcode.com/problems/fair-distribution-of-cookies/submissions/
Medium - https://leetcode.com/problems/display-table-of-food-orders-in-a-restaurant/
Medium - https://leetcode.com/problems/design-browser-history/
Medium - https://leetcode.com/problems/design-front-middle-back-queue/
Medium - https://leetcode.com/problems/find-consecutive-integers-from-a-data-stream/
Medium - https://leetcode.com/problems/random-pick-index/
Medium - https://leetcode.com/problems/frequency-tracker/
Medium - https://leetcode.com/problems/design-parking-system/
Medium
Dynamic Programming
- https://leetcode.com/problems/coin-change/
Medium - https://leetcode.com/problems/coin-change-2/
Medium - https://leetcode.com/problems/arithmetic-slices/
Medium - https://leetcode.com/problems/champagne-tower/
Medium - https://leetcode.com/problems/best-time-to-buy-and-sell-stock/
Easy - https://leetcode.com/problems/climbing-stairs/
Easy - https://leetcode.com/problems/n-th-tribonacci-number/
Easy - https://leetcode.com/problems/divisor-game/
Easy - https://leetcode.com/problems/min-cost-climbing-stairs/
Easy - https://leetcode.com/problems/longest-increasing-subsequence/
Medium - https://practice.geeksforgeeks.org/problems/max-sum-without-adjacents2430/1
Easy - https://leetcode.com/problems/delete-and-earn/
Medium - https://leetcode.com/problems/number-of-smooth-descent-periods-of-a-stock/
Medium - https://leetcode.com/problems/counting-bits/
EasyBit Manipulation - https://leetcode.com/problems/integer-break/
Medium - https://leetcode.com/problems/minimum-cost-for-tickets/
Medium - https://leetcode.com/problems/decode-ways/
Medium - https://practice.geeksforgeeks.org/problems/subset-sum-problem-1611555638/1/
MediumRecommended - https://leetcode.com/problems/partition-equal-subset-sum/
Medium - https://practice.geeksforgeeks.org/problems/perfect-sum-problem5633/1#
MediumStandard - https://leetcode.com/problems/target-sum/
MediumRecommended - https://www.codingninjas.com/codestudio/problems/rod-cutting-problem_800284
Medium - https://leetcode.com/problems/longest-common-subsequence/
MediumStandard - https://leetcode.com/problems/letter-combinations-of-a-phone-number/
Medium - https://leetcode.com/problems/delete-operation-for-two-strings/
Medium - https://leetcode.com/problems/minimum-ascii-delete-sum-for-two-strings/
Medium - https://leetcode.com/problems/n-th-tribonacci-number/te-sum-for-two-strings/
Medium - https://leetcode.com/problems/longest-palindromic-subsequence/
Medium - https://leetcode.com/problems/jump-game-ii/
Medium - https://leetcode.com/problems//minimum-insertion-steps-to-make-a-string-palindrome/
Hard - https://leetcode.com/problems/shortest-common-supersequence/
Hard - https://leetcode.com/problems/palindrome-partitioning/
Medium - https://leetcode.com/problems/palindrome-partitioning-ii/
Hard - https://leetcode.com/problems/perfect-squares/
Medium - https://leetcode.com/problems/number-of-ways-to-buy-pens-and-pencils/
Medium - https://leetcode.com/problems/count-sorted-vowel-strings/
Medium - https://leetcode.com/problems/get-maximum-in-generated-array/
Easy - https://leetcode.com/problems/unique-paths-ii/
Medium - https://leetcode.com/problems/palindromic-substrings/
Medium - https://leetcode.com/problems/concatenated-words/
Hard - https://leetcode.com/problems/word-break/
Medium - https://leetcode.com/problems/word-break-ii/
Hard - https://leetcode.com/problems/unique-paths/
Medium - https://leetcode.com/problems/triangle/
Medium - https://leetcode.com/problems/minimum-path-cost-in-a-grid/
Medium - https://leetcode.com/problems/edit-distance/
Hard - https://leetcode.com/problems/longest-string-chain/
Medium - https://leetcode.com/problems/maximum-profit-in-job-scheduling/
Hard - https://leetcode.com/problems/maximum-earnings-from-taxi/
Medium - https://leetcode.com/problems/jump-game/
Medium - https://leetcode.com/problems/string-compression/
Medium - https://leetcode.com/problems/time-needed-to-rearrange-a-binary-string/
Medium - https://leetcode.com/problems/minimum-path-sum/
Medium - https://leetcode.com/problems/fibonacci-number/
Easy - https://leetcode.com/problems/length-of-longest-fibonacci-subsequence/
Medium - https://leetcode.com/problems/interleaving-string/
Medium - https://leetcode.com/problems/out-of-boundary-paths/
Medium - https://leetcode.com/problems/knight-probability-in-chessboard/
Medium - https://leetcode.com/problems/check-if-there-is-a-valid-partition-for-the-array/
Medium - https://leetcode.com/problems/k-concatenation-maximum-sum/
Medium - https://leetcode.com/problems/number-of-ways-to-reach-a-position-after-exactly-k-steps/
Medium - https://leetcode.com/problems/count-square-submatrices-with-all-ones/
Medium - https://leetcode.com/problems/all-possible-full-binary-trees/
Medium - https://leetcode.com/problems/minimum-number-of-removals-to-make-mountain-array/
Hard - https://leetcode.com/problems/max-dot-product-of-two-subsequences/
Medium - https://leetcode.com/problems/number-of-dice-rolls-with-target-sum/
Medium - https://leetcode.com/problems/where-will-the-ball-fall/
Medium - https://leetcode.com/problems/unique-binary-search-trees/
Medium - https://leetcode.com/problems/find-the-substring-with-maximum-cost/
Medium - https://leetcode.com/problems/maximum-product-subarray/
Medium - https://leetcode.com/problems/best-time-to-buy-and-sell-stock-ii/
Medium - https://leetcode.com/problems/different-ways-to-add-parentheses/
Medium - https://leetcode.com/problems/unique-binary-search-trees-ii/
Medium - https://leetcode.com/problems/profitable-schemes/
Hard - https://leetcode.com/problems/maximum-value-of-k-coins-from-piles/
Hard - https://leetcode.com/problems/uncrossed-lines/
Medium - https://leetcode.com/problems/make-array-strictly-increasing/
Hard - https://leetcode.com/problems/number-of-increasing-paths-in-a-grid/
Hard - https://leetcode.com/problems/number-of-music-playlists/
hard
Graphs
- https://leetcode.com/problems/flood-fill/
Easy - https://leetcode.com/problems/is-graph-bipartite/
Medium - https://leetcode.com/problems/jump-game-vii/
Medium - https://leetcode.com/problems/find-center-of-star-graph/
Easy - https://leetcode.com/problems/reachable-nodes-with-restrictions/
Medium - https://leetcode.com/problems/snakes-and-ladders/
Medium - https://leetcode.com/problems/max-area-of-island/
Medium - https://leetcode.com/problems/minimum-jumps-to-reach-home/
Medium - https://leetcode.com/problems/lexicographical-numbers/
Medium - https://leetcode.com/problems/word-search/
Medium - https://leetcode.com/problems/find-if-path-exists-in-graph/
Easy - https://leetcode.com/problems/find-the-town-judge/
Easy - https://leetcode.com/problems/minimum-number-of-vertices-to-reach-all-nodes/
Medium - https://leetcode.com/problems/all-paths-from-source-to-target/
Medium - https://leetcode.com/problems/keys-and-rooms/
Medium - https://leetcode.com/problems/pacific-atlantic-water-flow/
Medium - https://leetcode.com/problems/numbers-with-same-consecutive-differences/
Medium - https://leetcode.com/problems/minimum-genetic-mutation/
Medium - https://leetcode.com/problems/nearest-exit-from-entrance-in-maze/
Medium - https://leetcode.com/problems/minimum-score-of-a-path-between-two-cities/
Medium - https://leetcode.com/problems/unique-paths-iii/
Hard - https://leetcode.com/problems/shortest-path-with-alternating-colors/
Medium - https://leetcode.com/problems/minimum-fuel-cost-to-report-to-the-capital/
Medium - https://leetcode.com/problems/minimum-distance-between-bst-nodes/
Easy - https://leetcode.com/problems/check-knight-tour-configuration/
Medium - https://leetcode.com/problems/number-of-closed-islands/
Medium - https://leetcode.com/problems/surrounded-regions/
Medium - https://leetcode.com/problems/number-of-enclaves/
Medium - https://leetcode.com/problems/course-schedule/
Medium - https://leetcode.com/problems/course-schedule-ii/
Medium - https://leetcode.com/problems/rotting-oranges/
Medium - https://leetcode.com/problems/evaluate-division/
Medium - https://leetcode.com/problems/shortest-bridge/
Medium - https://leetcode.com/problems/time-needed-to-inform-all-employees/
Medium - https://leetcode.com/problems/number-of-provinces/
Medium
Greedy
- https://leetcode.com/problems/can-place-flowers/
Easy - https://leetcode.com/problems/container-with-most-water/
Medium - https://leetcode.com/problems/minimum-number-of-arrows-to-burst-balloons/
Medium - https://leetcode.com/problems/non-overlapping-intervals/
Medium - https://leetcode.com/problems/merge-intervals/
Medium - https://leetcode.com/problems/remove-covered-intervals/
Medium - https://leetcode.com/problems/teemo-attacking/
Easy - https://leetcode.com/problems/gas-station/
Easy - https://leetcode.com/problems/last-stone-weight/
Easy - https://leetcode.com/problems/partition-labels/
Medium - https://leetcode.com/problems/smallest-string-with-a-given-numeric-value/
Medium - https://leetcode.com/problems/broken-calculator/
Medium - https://leetcode.com/problems/boats-to-save-people/
Medium - https://leetcode.com/problems/two-city-scheduling/
Medium - https://leetcode.com/problems/container-with-most-water/
Medium - https://leetcode.com/problems/minimum-number-of-operations-to-convert-time/
Easy - https://leetcode.com/problems/minimum-rounds-to-complete-all-tasks/
Medium - https://leetcode.com/problems/removing-minimum-and-maximum-from-array/
Medium - https://leetcode.com/problems/partitioning-into-minimum-number-of-deci-binary-numbers/
Medium - https://leetcode.com/problems/largest-number/
Medium - https://leetcode.com/problems/smallest-value-of-the-rearranged-number/
Medium - https://leetcode.com/problems/minimum-moves-to-equal-array-elements/
Medium - https://leetcode.com/problems/minimum-moves-to-equal-array-elements-ii/
Medium - https://leetcode.com/problems/minimum-operations-to-make-a-uni-value-grid/
Medium - https://leetcode.com/problems/maximum-units-on-a-truck/
Easy - https://leetcode.com/problems/maximum-area-of-a-piece-of-cake-after-horizontal-and-vertical-cuts/
Medium - https://leetcode.com/problems/wiggle-subsequence/
Medium - https://leetcode.com/problems/candy/
Hard - https://leetcode.com/problems/longest-consecutive-sequence/
Medium - https://leetcode.com/problems/maximum-consecutive-floors-without-special-floors/
Medium - https://leetcode.com/problems/max-area-of-island/
Medium - https://leetcode.com/problems/split-array-into-consecutive-subsequences/
Medium - https://leetcode.com/problems/two-furthest-houses-with-different-colors/
Easy - https://leetcode.com/problems/bag-of-tokens/
Medium - https://leetcode.com/problems/find-original-array-from-doubled-array/
Medium - https://leetcode.com/problems/minimum-time-to-make-rope-colorful/description/
Medium - https://leetcode.com/problems/break-a-palindrome/
Medium - https://leetcode.com/problems/minimize-maximum-pair-sum-in-array/
Medium - https://leetcode.com/problems/remove-digit-from-number-to-maximize-result/
Easy - https://leetcode.com/problems/max-increase-to-keep-city-skyline/
Medium - https://leetcode.com/problems/maximum-number-of-coins-you-can-get/
Medium - https://leetcode.com/problems/score-after-flipping-matrix/
Medium - https://leetcode.com/problems/find-valid-matrix-given-row-and-column-sums/
Medium - https://leetcode.com/problems/take-k-of-each-character-from-left-and-right/
Medium - https://leetcode.com/problems/partition-string-into-substrings-with-values-at-most-k/
Medium - https://leetcode.com/problems/maximum-ice-cream-bars/
Medium - https://leetcode.com/problems/make-number-of-distinct-characters-equal/
Medium - https://leetcode.com/problems/insert-interval/
Medium - https://leetcode.com/problems/maximum-difference-by-remapping-a-digit/
Easy - https://leetcode.com/problems/minimum-score-by-changing-two-elements/
Medium - https://leetcode.com/problems/minimum-operations-to-reduce-an-integer-to-0/
Easy - https://leetcode.com/problems/merge-two-2d-arrays-by-summing-values/
Easy - https://leetcode.com/problems/find-the-maximum-number-of-marked-indices
Medium - https://leetcode.com/problems/count-ways-to-group-overlapping-ranges/
Medium - https://leetcode.com/problems/distribute-money-to-maximum-children/
Medium - https://leetcode.com/problems/smallest-missing-non-negative-integer-after-operations/
Medium - https://leetcode.com/problems/prime-subtraction-operation/
Medium - https://leetcode.com/problems/k-items-with-the-maximum-sum/
Easy - https://leetcode.com/problems/mice-and-cheese/
Medium - https://leetcode.com/problems/lexicographically-smallest-string-after-substring-operation/
Medium
HashTable
- https://leetcode.com/problems/number-of-matching-subsequences/
Medium - https://leetcode.com/problems/contains-duplicate-ii/
Easy - https://leetcode.com/problems/find-players-with-zero-or-one-losses/
Medium - https://leetcode.com/problems/kth-distinct-string-in-an-array/
Easy - https://leetcode.com/problems/max-number-of-k-sum-pairs/
Medium - https://leetcode.com/problems/contains-duplicate/
Easy - https://leetcode.com/problems/contains-duplicate-iii/
Medium - https://leetcode.com/problems/replace-elements-in-an-array/
Medium - https://leetcode.com/problems/longest-harmonious-subsequence/
Medium - https://leetcode.com/problems/distribute-candies/
Easy - https://leetcode.com/problems/prefix-and-suffix-search/
Hard - https://leetcode.com/problems/longest-word-in-dictionary/
Medium - https://leetcode.com/problems/minimum-deletions-to-make-character-frequencies-unique/
Medium - https://leetcode.com/problems/decode-the-message/
Easy - https://leetcode.com/problems/maximum-number-of-pairs-in-array/
Easy - https://leetcode.com/problems/max-sum-of-a-pair-with-equal-sum-of-digits/
Medium - https://leetcode.com/problems/query-kth-smallest
Medium - https://leetcode.com/problems/minimum-area-rectangle/
Medium - https://leetcode.com/problems/find-and-replace-pattern/
Medium - https://leetcode.com/problems/number-of-arithmetic-triplets/
Easy - https://leetcode.com/problems/merge-similar-items/
Easy - https://leetcode.com/problems/count-number-of-bad-pairs/
Medium - https://leetcode.com/problems/largest-palindromic-number/
Medium - https://leetcode.com/problems/ransom-note/
Easy - https://leetcode.com/problems/count-common-words-with-one-occurrence/
Easy - https://leetcode.com/problems/find-subarrays-with-equal-sum/
Medium - https://leetcode.com/problems/check-distances-between-same-letters/
Easy - https://leetcode.com/problems/find-duplicate-file-in-system/
Medium - https://leetcode.com/problems/count-number-of-distinct-integers-after-reverse-operations/
Medium - https://leetcode.com/problems/majority-element-ii/
Medium - https://leetcode.com/problems/maximum-sum-of-distinct-subarrays-with-length-k/
Medium - https://leetcode.com/problems/most-popular-video-creator/
Medium - https://leetcode.com/problems/task-scheduler/
Medium - https://leetcode.com/problems/valid-sudoku/
Medium - https://leetcode.com/problems/determine-if-two-strings-are-close/
Medium - https://leetcode.com/problems/divide-players-into-teams-of-equal-skill/
Medium - https://leetcode.com/problems/form-smallest-number-from-two-digit-arrays/
Easy - https://leetcode.com/problems/subdomain-visit-count/
Medium - https://leetcode.com/problems/bulls-and-cows/
Medium - https://leetcode.com/problems/rle-iterator/
Medium - https://leetcode.com/problems/count-servers-that-communicate/
Medium - https://leetcode.com/problems/minimum-number-of-steps-to-make-two-strings-anagram/
Medium - https://leetcode.com/problems/find-the-distinct-difference-array/
Easy - https://leetcode.com/problems/finding-the-users-active-minutes/
Medium - https://leetcode.com/problems/group-the-people-given-the-group-size-they-belong-to/
Medium
Heap
- https://leetcode.com/problems/last-stone-weight/
EasyRecommended - https://leetcode.com/problems/top-k-frequent-elements/
Medium - https://leetcode.com/problems/furthest-building-you-can-reach/
Medium - https://leetcode.com/problems/course-schedule-iii/
Hard - https://leetcode.com/problems/construct-target-array-with-multiple-sums/
Hard - https://leetcode.com/problems/sort-the-matrix-diagonally/
Medium - https://leetcode.com/problems/sliding-window-maximum/
Hard - https://leetcode.com/problems/minimum-deletions-to-make-array-divisible/
Hard - https://leetcode.com/problems/minimum-amount-of-time-to-fill-cups/
Easy - https://leetcode.com/problems/reduce-array-size-to-the-half/
Medium - https://leetcode.com/problems/divide-intervals-into-minimum-number-of-groups/
Medium - https://leetcode.com/problems/sort-the-people/
Easy - https://leetcode.com/problems/total-cost-to-hire-k-workers/
Medium - https://leetcode.com/problems/remove-stones-to-minimize-the-total/
Medium - https://leetcode.com/problems/convert-an-array-into-a-2d-array-with-conditions/
Medium - https://leetcode.com/problems/distant-barcodes/
Medium - https://leetcode.com/problems/largest-values-from-labels/
Medium
LinkedLists
- https://leetcode.com/problems/maximum-twin-sum-of-a-linked-list/
Medium - https://leetcode.com/problems/merge-k-sorted-lists/
Hard - https://leetcode.com/problems/merge-nodes-in-between-zeros/
Medium - https://leetcode.com/problems/remove-duplicates-from-sorted-list/
Medium - https://leetcode.com/problems/swap-nodes-in-pairs/
Medium - https://leetcode.com/problems/merge-two-sorted-lists/
Easy - https://leetcode.com/problems/remove-duplicates-from-sorted-list-ii/
Medium - https://leetcode.com/problems/linked-list-cycle/
Easy - https://leetcode.com/problems/add-two-numbers/
Medium - https://leetcode.com/problems/rotate-list/
Medium - https://leetcode.com/problems/copy-list-with-random-pointer/
Medium - https://leetcode.com/problems/remove-nth-node-from-end-of-list/
Medium - https://leetcode.com/problems/swapping-nodes-in-a-linked-list/
Medium - https://leetcode.com/problems/plus-one-linked-list/
MediumPremium - https://leetcode.com/problems/intersection-of-two-linked-lists/
Easy - https://leetcode.com/problems/partition-list/
Medium - https://leetcode.com/problems/reverse-linked-list-ii/
Medium - https://leetcode.com/problems/reverse-linked-list/
Easy - https://leetcode.com/problems/palindrome-linked-list/
Easy - https://leetcode.com/problems/merge-in-between-linked-lists/
Medium - https://leetcode.com/problems/middle-of-the-linked-list/
Easy - https://leetcode.com/problems/linked-list-cycle-ii/
Medium - https://leetcode.com/problems/delete-node-in-a-linked-list/
Medium - https://leetcode.com/problems/delete-the-middle-node-of-a-linked-list
Medium - https://leetcode.com/problems/reorder-list/
Medium - https://leetcode.com/problems/remove-nodes-from-linked-list/
Medium - https://leetcode.com/problems/odd-even-linked-list/
Medium - https://leetcode.com/problems/remove-linked-list-elements/
Easy - https://leetcode.com/problems/reverse-nodes-in-k-group/
Hard - https://leetcode.com/problems/add-two-numbers-ii/
Medium
Maths
- https://leetcode.com/problems/add-digits/
Easy - https://leetcode.com/problems/happy-number/
Easy - https://leetcode.com/problems/find-numbers-with-even-number-of-digits/
Easy - https://leetcode.com/problems/smallest-integer-divisible-by-k/
Medium - https://leetcode.com/problems/minimum-moves-to-reach-target-score/
MediumGreedy - https://leetcode.com/problems/minimum-sum-of-four-digit-number-after-splitting-digits/
Easy - https://leetcode.com/problems/find-three-consecutive-integers-that-sum-to-a-given-number/
Medium - https://leetcode.com/problems/count-integers-with-even-digit-sum/
Easy - https://leetcode.com/problems/number-of-1-bits/
Easy - https://leetcode.com/problems/largest-number-after-digit-swaps-by-parity/
Easy - https://leetcode.com/problems/minimize-result-by-adding-parentheses-to-expression/
Medium - https://leetcode.com/problems/maximum-product-after-k-increments/k
Medium - https://leetcode.com/problems/design-an-atm-machine/
Medium - https://leetcode.com/problems/count-lattice-points-inside-a-circle/
Medium - https://leetcode.com/problems/super-pow/
Medium - https://leetcode.com/problems/count-nice-pairs-in-an-array/
Medium - https://leetcode.com/problems/count-number-of-rectangles-containing-each-point/
Medium - https://leetcode.com/problems/power-of-three/
Easy - https://leetcode.com/problems/power-of-four/
Easy - https://leetcode.com/problems/power-of-two
Easy - https://leetcode.com/problems/reordered-power-of-2/ ````Medium```
- https://leetcode.com/problems/reverse-bits/
Easy - https://leetcode.com/problems/subtract-the-product-and-sum-of-digits-of-an-integer/
Easy - https://leetcode.com/problems/strictly-palindromic-number/
Medium - https://leetcode.com/problems/largest-perimeter-triangle/
Easy - https://leetcode.com/problems/sum-of-number-and-its-reverse/
Medium - https://leetcode.com/problems/average-value-of-even-numbers-that-are-divisible-by-three/
Easy - https://leetcode.com/problems/minimum-addition-to-make-integer-beautiful/
Medium - https://leetcode.com/problems/smallest-value-after-replacing-with-sum-of-prime-factors/
Medium - https://leetcode.com/problems/categorize-box-according-to-criteria/
Easy - https://leetcode.com/problems/count-distinct-numbers-on-board/
Easy - https://leetcode.com/problems/minimum-impossible-or
Easy - https://leetcode.com/problems/find-the-divisibility-array-of-a-string/
Medium - https://leetcode.com/problems/partition-array-into-three-parts-with-equal-sum/
Easy - https://leetcode.com/problems/pass-the-pillow/
Easy - https://leetcode.com/problems/make-k-subarray-sums-equal/
Medium - https://leetcode.com/problems/sum-of-absolute-differences-in-a-sorted-array/
Medium - https://leetcode.com/problems/nim-game/
Maths - https://leetcode.com/problems/factorial-trailing-zeroes/
Medium - https://leetcode.com/problems/fraction-to-recurring-decimal/
Medium - https://leetcode.com/problems/prime-in-diagonal/
Easy - https://leetcode.com/problems/fizz-buzz/
Easy - https://leetcode.com/problems/third-maximum-number/
Easy - https://leetcode.com/problems/add-strings/
Easy - https://leetcode.com/problems/number-complement/
Easy - https://leetcode.com/problems/find-the-maximum-divisibility-score/
Easy - https://leetcode.com/problems/rotate-function/
Medium - https://leetcode.com/problems/find-the-punishment-number-of-an-integer/
Medium
Prefix Sum
- https://leetcode.com/problems/minimum-size-subarray-sum/
Medium - https://leetcode.com/problems/product-of-array-except-self/
Medium - https://leetcode.com/problems/range-sum-query-immutable/
Easy - https://leetcode.com/problems/range-sum-query-2d-immutable/
Medium - https://leetcode.com/problems/continuous-subarray-sum/
Medium - https://leetcode.com/problems/find-pivot-index/
Easy - https://leetcode.com/problems/sum-of-all-odd-length-subarrays/
Easy - https://leetcode.com/problems/minimum-value-to-get-positive-step-by-step-sum/
Easy - https://leetcode.com/problems/find-the-middle-index-in-array/submissions/
Easy - https://leetcode.com/problems/running-sum-of-1d-array/
Easy - https://leetcode.com/problems/minimum-average-difference/
Medium - https://leetcode.com/problems/top-k-frequent-words/
Easy - https://leetcode.com/problems/number-of-ways-to-split-array/
Medium - https://leetcode.com/problems/random-pick-with-weight/
Medium - https://leetcode.com/problems/minimum-operations-to-reduce-x-to-zero/
Medium - https://leetcode.com/problems/count-subarrays-with-score-less-than-k/
Medium - https://leetcode.com/problems/maximum-erasure-value/
Medium - https://leetcode.com/problems/non-decreasing-array/
Medium - https://leetcode.com/problems/frequency-of-the-most-frequent-element/
Medium - https://leetcode.com/problems/xor-queries-of-a-subarray/
Medium - https://leetcode.com/problems/maximum-points-you-can-obtain-from-cards/
Medium - https://leetcode.com/problems/find-good-days-to-rob-the-bank/
Medium - https://leetcode.com/problems/shifting-letters/
Medium - https://leetcode.com/problems/shifting-letters-ii/
Medium - https://leetcode.com/problems/longest-subsequence-with-limited-sum/
Easy - https://leetcode.com/problems/minimum-amount-of-time-to-collect-garbage/
Medium - https://leetcode.com/problems/find-all-good-indices/
Medium - https://leetcode.com/problems/find-the-pivot-integer/
Easy - https://leetcode.com/problems/left-and-right-sum-differences/
Easy - https://leetcode.com/problems/minimum-operations-to-make-all-array-elements-equal/
Medium - https://leetcode.com/problems/corporate-flight-bookings/
Medium - https://leetcode.com/problems/sum-of-distances/
Medium - https://leetcode.com/problems/find-the-score-of-all-prefixes-of-an-array/
Medium - https://leetcode.com/problems/binary-subarrays-with-sum/
Medium - https://leetcode.com/problems/minimum-number-of-operations-to-move-all-balls-to-each-box/
Medium - https://leetcode.com/problems/k-radius-subarray-averages/
Medium
Queue
- https://leetcode.com/problems/implement-queue-using-stacks/
Easy - https://leetcode.com/problems/time-needed-to-buy-tickets/
Easy - https://www.codingninjas.com/reverse-first-k-elements-of-queue
Easy - https://leetcode.com/problems/design-circular-queue/
Medium - https://leetcode.com/problems/find-the-winner-of-the-circular-game/
Medium - https://leetcode.com/problems/design-front-middle-back-queue/
Medium - https://leetcode.com/problems/product-of-the-last-k-numbers/
Medium - https://leetcode.com/problems/shortest-path-in-binary-matrix/
Medium
Recursion
- https://www.geeksforgeeks.org/sum-triangle-from-array/
EasyGFG - https://leetcode.com/problems/sudoku-solver/
Hard - https://leetcode.com/problems/combination-sum-iii/
Medium - https://leetcode.com/problems/elimination-game/
Medium - https://leetcode.com/problems/k-th-symbol-in-grammar/
Medium - https://leetcode.com/problems/count-and-say/
Medium - https://leetcode.com/problems/find-kth-bit-in-nth-binary-string/
Medium - https://leetcode.com/problems/construct-quad-tree/
Medium
Search
- https://leetcode.com/problems/arranging-coins/
Easy - https://leetcode.com/problems/binary-search/
Very Easy - https://leetcode.com/problems/check-if-n-and-its-double-exist/
Easy - https://leetcode.com/problems/kth-smallest-element-in-a-sorted-matrix/
Medium - https://leetcode.com/problems/count-negative-numbers-in-a-sorted-matrix/
Easy - https://leetcode.com/problems/fair-candy-swap/
Easy - https://leetcode.com/problems/find-first-and-last-position-of-element-in-sorted-array/
Easy - https://leetcode.com/problems/find-in-mountain-array/
Hard - https://leetcode.com/problems/find-minimum-in-rotated-sorted-array/
Medium - https://leetcode.com/problems/find-smallest-letter-greater-than-target/
Easy - https://leetcode.com/problems/first-bad-version/
Very Easy - https://leetcode.com/problems/guess-number-higher-or-lower/
Very Easy - https://leetcode.com/problems/intersection-of-two-arrays-ii/
Easy - https://leetcode.com/problems/intersection-of-two-arrays/
Easy - https://leetcode.com/problems/single-element-in-a-sorted-array/
Medium - https://leetcode.com/problems/special-array-with-x-elements-greater-than-or-equal-x/
Easy - https://leetcode.com/problems/sqrtx/
Very Easy - https://leetcode.com/problems/valid-perfect-square/
Very Easy - https://www.geeksforgeeks.org/find-rotation-count-rotated-sorted-array/
Easy - https://leetcode.com/problems/median-of-two-sorted-arrays/
Hard - https://leetcode.com/problems/maximum-candies-allocated-to-k-children/
Medium - https://leetcode.com/problems/successful-pairs-of-spells-and-potions/
Medium - https://leetcode.com/problems/count-number-of-rectangles-containing-each-point/
Medium - https://leetcode.com/problems/powx-n/
Medium - https://leetcode.com/problems/capacity-to-ship-packages-within-d-days/
Medium - https://leetcode.com/problems/minimized-maximum-of-products-distributed-to-any-store/
Medium - https://leetcode.com/problems/my-calendar-i/
Medium - https://leetcode.com/problems/median-of-two-sorted-arrays/
Hard - https://leetcode.com/problems/maximum-count-of-positive-integer-and-negative-integer/
Easy
Sorting
-
BubbleSort
-
CustomSort
- https://leetcode.com/problems/matrix-cells-in-distance-order/
Easy - https://leetcode.com/problems/sort-the-jumbled-numbers/
Medium - https://leetcode.com/problems/kth-largest-element-in-a-stream/
Easy - https://leetcode.com/problems/find-closest-number-to-zero/
Easy - https://leetcode.com/problems/sort-array-by-parity/
Easy - https://leetcode.com/problems/missing-number/
Easy - https://leetcode.com/problems/sender-with-largest-word-count/
MediumArray - https://leetcode.com/problems/maximum-total-importance-of-roads/
Medium - https://leetcode.com/problems/top-k-frequent-words/
Medium - https://leetcode.com/problems/queue-reconstruction-by-height/
Medium - https://leetcode.com/problems/sort-characters-by-frequency/
Medium - https://leetcode.com/problems/delete-greatest-value-in-each-row/
Easy - https://leetcode.com/problems/longest-square-streak-in-an-array/
Medium - https://leetcode.com/problems/sort-the-students-by-their-kth-score/
Medium - https://leetcode.com/problems/custom-sort-string/
Medium - https://leetcode.com/problems/neither-minimum-nor-maximum/
Medium
- https://leetcode.com/problems/matrix-cells-in-distance-order/
-
CycleSort
- https://leetcode.com/problems/missing-number/
Easy - https://leetcode.com/problems/set-mismatch/ ```Easy`https://leetcode.com/problems/majority-element-ii/``
- https://leetcode.com/problems/find-all-numbers-disappeared-in-an-array/
Easy - https://leetcode.com/problems/find-the-duplicate-number/
Medium - https://leetcode.com/problems/find-all-duplicates-in-an-array/
Medium
- https://leetcode.com/problems/missing-number/
-
InsertionSort
-
SelectionSort
Stack
- https://leetcode.com/problems/daily-temperatures/
Medium - https://leetcode.com/problems/min-stack/
Easy - https://leetcode.com/problems/backspace-string-compare/
Easy - https://leetcode.com/problems/implement-stack-using-queues/
Easy - https://leetcode.com/problems/valid-parentheses/
Easy - https://leetcode.com/problems/next-greater-element-i/
Easy - https://www.interviewbit.com/problems/nearest-smaller-element/#
Easy - https://practice.geeksforgeeks.org/problems/sort-a-stack/1
Easy - https://leetcode.com/problems/increasing-order-search-tree/
Medium - https://leetcode.com/problems/largest-rectangle-in-histogram/
HardRecommended - https://leetcode.com/problems/minimum-add-to-make-parentheses-valid/
Medium - https://leetcode.com/problems/maximal-rectangle/
Hard - https://leetcode.com/problems/is-subsequence/
Easy - https://leetcode.com/problems/remove-k-digits/
MediumRecommended - https://leetcode.com/problems/score-of-parentheses/
Medium - https://leetcode.com/problems/minimum-remove-to-make-valid-parentheses/
Medium - https://leetcode.com/problems/simplify-path/
Medium - https://leetcode.com/problems/validate-stack-sequences/
Medium - https://leetcode.com/problems/remove-all-adjacent-duplicates-in-string-ii/
Medium - https://leetcode.com/problems/132-pattern/
Medium - https://leetcode.com/problems/flatten-nested-list-iterator/
Medium - https://leetcode.com/problems/remove-all-adjacent-duplicates-in-string/
Easy - https://leetcode.com/problems/steps-to-make-array-non-decreasing/
Medium - https://leetcode.com/problems/maximum-product-of-word-lengths/
Medium - https://leetcode.com/problems/minimum-deletions-to-make-array-beautiful/
Medium - https://leetcode.com/problems/construct-smallest-number-from-di-string/
Medium - https://leetcode.com/problems/longest-absolute-file-path/
Medium - https://leetcode.com/problems/removing-stars-from-a-string/
Medium - https://leetcode.com/problems/maximum-binary-tree/
Medium - https://leetcode.com/problems/make-the-string-great/
Easy - https://leetcode.com/problems/online-stock-span/
Medium - https://leetcode.com/problems/basic-calculator-ii/
Medium - https://leetcode.com/problems/validate-stack-sequences/
Medium - https://leetcode.com/problems/decode-string/
Medium - https://leetcode.com/problems/reveal-cards-in-increasing-order/
Medium - https://leetcode.com/problems/minimum-string-length-after-removing-substrings/
Easy
Strings
- https://leetcode.com/problems/adding-spaces-to-a-string/
Medium - https://leetcode.com/problems/matchsticks-to-square/
Medium - https://leetcode.com/problems/find-substring-with-given-hash-value/
MediumRecommended - https://leetcode.com/problems/find-the-difference/ ```Easy``
- https://leetcode.com/problems/longest-palindrome-by-concatenating-two-letter-words/
Medium - https://leetcode.com/problems/minimum-number-of-steps-to-make-two-strings-anagram-ii/
Easy - https://leetcode.com/problems/permutation-in-string/
Medium - https://leetcode.com/problems/robot-bounded-in-circle/
MediumRecommended - https://leetcode.com/problems/string-to-integer-atoi/
MediumRecommended - https://leetcode.com/problems/word-pattern/
Easy - https://leetcode.com/problems/cells-in-a-range-on-an-excel-sheet/
Easy - https://leetcode.com/problems/maximum-repeating-substring/
Easy - https://leetcode.com/problems/binary-watch/
Easy - https://leetcode.com/problems/reverse-string/
Easy - https://leetcode.com/problems/valid-palindrome-ii/
Easy - https://leetcode.com/problems/compare-strings-by-frequency-of-the-smallest-character/
Medium - https://leetcode.com/problems/zigzag-conversion/
Medium - https://leetcode.com/problems/count-prefixes-of-a-given-string/
Easy - https://leetcode.com/problems/find-resultant-array-after-removing-anagrams/submissions/
Easy - https://leetcode.com/problems/check-if-number-has-equal-digit-count-and-digit-value/
Easy - https://leetcode.com/problems/contains-duplicate/
Easy - https://leetcode.com/problems/rearrange-characters-to-make-target-string/
Easy - https://leetcode.com/problems/find-common-characters/
Easy - https://leetcode.com/problems/remove-palindromic-subsequences/
Easy - https://leetcode.com/problems/strong-password-checker-ii/
Easy - https://leetcode.com/problems/number-of-segments-in-a-string/
Easy - https://leetcode.com/problems/string-without-aaa-or-bbb/
Medium - https://leetcode.com/problems/search-suggestions-system/
Medium - https://leetcode.com/problems/short-encoding-of-words/
Medium - https://leetcode.com/problems/greatest-english-letter-in-upper-and-lower-case/
Easy - https://leetcode.com/problems/unique-morse-code-words/
Easy - https://leetcode.com/problems/count-asterisks/
Easy - https://leetcode.com/problems/valid-anagram/
Easy - https://leetcode.com/problems/longest-ideal-subsequence/
Medium - https://leetcode.com/problems/first-unique-character-in-a-string/
Easy - https://leetcode.com/problems/minimum-recolors-to-get-k-consecutive-black-blocks/
Easy - https://leetcode.com/problems/isomorphic-strings/
Easy - https://leetcode.com/problems/check-if-a-word-occurs-as-a-prefix-of-any-word-in-a-sentence/
Easy - https://leetcode.com/problems/maximum-number-of-vowels-in-a-substring-of-given-length/
Medium - https://leetcode.com/problems/longest-palindrome/
Easy - https://leetcode.com/problems/strong-password-checker/
Hard - https://leetcode.com/problems/reverse-words-in-a-string/
Medium - https://leetcode.com/problems/reverse-vowels-of-a-string/
Easy - https://leetcode.com/problems/determine-if-string-halves-are-alike/
Easy - https://leetcode.com/problems/circular-sentence/
Easy - https://leetcode.com/problems/maximum-value-of-a-string-in-an-array/
Easy - https://leetcode.com/problems/count-pairs-of-similar-strings/
Easy - https://leetcode.com/problems/greatest-common-divisor-of-strings/
Easy - https://leetcode.com/problems/defanging-an-ip-address/
Easy - https://leetcode.com/problems/find-the-longest-balanced-substring-of-a-binary-string/
Easy - https://leetcode.com/problems/delete-characters-to-make-fancy-string/
Easy - https://leetcode.com/problems/repeated-substring-pattern/
Easy - https://leetcode.com/problems/find-the-width-of-columns-of-a-grid/
Easy - https://leetcode.com/problems/minimum-additions-to-make-valid-string/
Easy - https://leetcode.com/problems/merge-strings-alternately/
Easy - https://leetcode.com/problems/lexicographically-smallest-palindrome/
Easy - https://leetcode.com/problems/minimize-string-length/
Easy - https://leetcode.com/problems/check-if-a-string-is-an-acronym-of-words/
Easy
Trees
- https://leetcode.com/problems/insert-into-a-binary-search-tree/
Medium - https://leetcode.com/problems/all-elements-in-two-binary-search-trees/
Medium - https://leetcode.com/problems/convert-bst-to-greater-tree/
Medium - https://leetcode.com/problems/recover-binary-search-tree/
Medium - https://leetcode.com/problems/kth-smallest-element-in-a-bst/
Medium - https://leetcode.com/problems/maximum-depth-of-binary-tree/
Easy - https://leetcode.com/problems/minimum-depth-of-binary-tree/
Easy - https://leetcode.com/problems/diameter-of-binary-tree/
Easy - https://leetcode.com/problems/count-complete-tree-nodes/
Medium - https://leetcode.com/problems/binary-tree-right-side-view/
Medium - https://leetcode.com/problems/balanced-binary-tree/
Easy - https://leetcode.com/problems/remove-duplicates-from-sorted-array/
Medium - https://leetcode.com/problems/binary-tree-inorder-traversal/
Easy - https://leetcode.com/problems/populating-next-right-pointers-in-each-node/
Medium - https://leetcode.com/problems/binary-tree-zigzag-level-order-traversal/
Medium - https://leetcode.com/problems/count-complete-tree-nodes/
Medium - https://leetcode.com/problems/search-in-a-binary-search-tree/
Easy - https://leetcode.com/problems/root-equals-sum-of-children/
Easy - https://leetcode.com/problems/same-tree/
Easy - https://leetcode.com/problems/convert-sorted-array-to-binary-search-tree/
Easy - https://leetcode.com/problems/symmetric-tree/
Easy - https://leetcode.com/problems/increasing-order-search-tree/
Easy - https://leetcode.com/problems/binary-search-tree-iterator/
Medium - https://leetcode.com/problems/validate-binary-search-tree/
Medium - https://leetcode.com/problems/two-sum-iv-input-is-a-bst/
Easy - https://leetcode.com/problems/network-delay-time/
Medium - https://leetcode.com/problems/deepest-leaves-sum/
Medium - https://leetcode.com/problems/find-a-corresponding-node-of-a-binary-tree-in-a-clone-of-that-tree/
Medium - https://leetcode.com/problems/critical-connections-in-a-network/
Hard - https://leetcode.com/problems/binary-tree-preorder-traversal/
Easy - https://leetcode.com/problems/n-ary-tree-preorder-traversal/
Easy - https://leetcode.com/problems/minimum-depth-of-binary-tree/
Easy - https://leetcode.com/problems/binary-tree-level-order-traversal/
Medium - https://leetcode.com/problems/binary-tree-zigzag-level-order-traversal/
Medium - https://leetcode.com/problems/min-cost-to-connect-all-points/
Medium - https://leetcode.com/problems/binary-tree-cameras/
Hard - https://leetcode.com/problems/vertical-order-traversal-of-a-binary-tree/
Hard - https://leetcode.com/problems/invert-binary-tree/
Easy - https://leetcode.com/problems/maximum-width-of-binary-tree/
Medium - https://leetcode.com/problems/even-odd-tree/
Medium - https://leetcode.com/problems/find-largest-value-in-each-tree-row/
Medium - https://leetcode.com/problems/binary-tree-tilt/
Easy - https://leetcode.com/problems/path-sum/
Easy - https://leetcode.com/problems/path-sum-ii/
Medium - https://leetcode.com/problems/path-sum-iii/
Medium - https://leetcode.com/problems/construct-binary-tree-from-inorder-and-postorder-traversal/
Medium - https://leetcode.com/problems/construct-binary-tree-from-preorder-and-inorder-traversal/
Medium - https://leetcode.com/problems/construct-string-from-binary-tree/
Easy - https://leetcode.com/problems/lowest-common-ancestor-of-a-binary-tree/
Medium - https://leetcode.com/problems/lowest-common-ancestor-of-a-binary-search-tree/
Medium - https://leetcode.com/problems/count-good-nodes-in-binary-tree/
Medium - https://leetcode.com/problems/n-ary-tree-level-order-traversal/
Medium - https://leetcode.com/problems/binary-tree-pruning/
Medium - https://leetcode.com/problems/balance-a-binary-search-tree/
Medium - https://leetcode.com/problems/maximum-binary-tree-ii/
Medium - https://leetcode.com/problems/pseudo-palindromic-paths-in-a-binary-tree/
Medium - https://leetcode.com/problems/most-frequent-subtree-sum/
Medium - https://leetcode.com/problems/add-one-row-to-tree/
Medium - https://leetcode.com/problems/two-sum-iv-input-is-a-bst/
Easy - https://leetcode.com/problems/delete-leaves-with-a-given-value/
Medium - https://leetcode.com/problems/leaf-similar-trees/
Easy - https://leetcode.com/problems/maximum-product-of-splitted-binary-tree/
Medium - https://leetcode.com/problems/binary-tree-maximum-path-sum/
Hard - https://leetcode.com/problems/sum-root-to-leaf-numbers/
Medium - https://leetcode.com/problems/delete-nodes-and-return-forest/
Medium - https://leetcode.com/problems/kth-largest-sum-in-a-binary-tree/
Medium - https://leetcode.com/problems/maximum-level-sum-of-a-binary-tree/
Medium - https://leetcode.com/problems/check-completeness-of-a-binary-tree/
Medium - https://leetcode.com/problems/binary-tree-level-order-traversal-ii/
Medium - https://leetcode.com/problems/cousins-in-binary-tree-ii/
Medium - https://leetcode.com/problems/cousins-in-binary-tree/
Easy - https://leetcode.com/problems/make-costs-of-paths-equal-in-a-binary-tree/
Medium - https://leetcode.com/problems/find-elements-in-a-contaminated-binary-tree/
Medium
Tries
- https://leetcode.com/problems/design-add-and-search-words-data-structure/
Medium - https://leetcode.com/problems/camelcase-matching/
Medium - https://leetcode.com/problems/longest-word-in-dictionary/
Medium - https://leetcode.com/problems/short-encoding-of-words/
Medium - https://leetcode.com/problems/replace-words/description/
Medium - https://leetcode.com/problems/sum-of-prefix-scores-of-strings/
Hard - https://leetcode.com/problems/implement-trie-prefix-tree/
Medium - https://leetcode.com/problems/implement-magic-dictionary/
Medium
Two Pointers
- https://leetcode.com/problems/push-dominoes/
Medium - https://leetcode.com/problems/string-compression/
Medium - https://leetcode.com/problems/valid-triangle-number/
Medium - https://leetcode.com/problems/append-characters-to-string-to-make-subsequence/
Medium - https://leetcode.com/problems/count-subarrays-with-fixed-bounds/
Hard - https://leetcode.com/problems/repeated-dna-sequences/
Medium - https://leetcode.com/problems/assign-cookies/
Easy - https://leetcode.com/problems/number-of-adjacent-elements-with-the-same-color/
Medium - https://leetcode.com/problems/longest-subarray-of-1s-after-deleting-one-element/
Medium
Concepts
- Print Number from 1 to N && from N to 1 && from 1 to N and N to 1 in same - Sum and Product of Digits in a Number - Reverse A Number - Maximize The Number By Swapping Adjacent Two Digits ```Not Yet Solved```-
dynamic Programming
- Print possible Sum for Target using given number as many times possible
- Longest Common Subsequence
- Printing Longest Common Subsequence
-
binarySearch
- Order Agnostic Binary Search
Binary Search - Search in Infinite Array
Binary Search - Find Binary Search Ceiling Value
Binary Search - Find Binary Search Floor Value
Binary Search - Find Pivot in Rotated Sorted Array
Binary Search - Find Pivot in Rotated Sorted Element with Duplicates
Binary Search - Rotation Count for Rotated Array
Binary Search - Search in Sorted Row and Column Wise Matrix
Binary Search - Search a Matrix sorted Row and Column wise
Binary Search , Matrix - Search a Sorted Matrix
Binary Search , Matrix
- Order Agnostic Binary Search
-
overflow & underflow
- String to Integer - Handling Integer Overflow and Underflow
-
graphs
- Graph Representation
- BFS
- DFS
- Cycle Detection Using BFS
- Cycle Detection Using DFS
- Cycle Detection Using BFS in DAG
- Cycle Detection Using DFS in DAG
- Topological Sort (Linear Ordering of Vertices such that if there is and edge u --> v, u appears before v in that ordering )
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