photosoftrips/high-on-dsa

Repository with leetcode solutions and dedicated index to prepare for your FAANGM interviews. Feel free to share and contribute to this awesome repository.

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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/ Medium Recursion
• 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/spiral-matrix-iii/ Medium Recommended
• https://leetcode.com/problems/spiral-matrix/ Medium
• https://leetcode.com/problems/summary-ranges/ Easy
• https://leetcode.com/problems/transpose-matrix/ Easy
• https://leetcode.com/problems/two-sum-ii-input-array-is-sorted/ Easy
• https://leetcode.com/problems/two-sum/ Easy
• https://leetcode.com/problems/valid-mountain-array/ Easy
• https://leetcode.com/problems/find-all-k-distant-indices-in-an-array/ Easy Recommended
• 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

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

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

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

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/ Easy Bit 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/ Medium Recommended
• https://leetcode.com/problems/partition-equal-subset-sum/ Medium
• https://practice.geeksforgeeks.org/problems/perfect-sum-problem5633/1# Medium Standard
• https://leetcode.com/problems/target-sum/ Medium Recommended
• https://www.codingninjas.com/codestudio/problems/rod-cutting-problem_800284 Medium
• https://leetcode.com/problems/longest-common-subsequence/ Medium Standard
• 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/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

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

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

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-trimmed-number/ 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

Heap

• https://leetcode.com/problems/last-stone-weight/ Easy Recommended
• 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

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

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/ Medium Premium
• 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

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/ Medium Greedy
• 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/add-one-row-to-tree/description/
• 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

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/ Easy GFG
• https://leetcode.com/problems/sudoku-solver/ Hard
• https://leetcode.com/problems/combination-sum-iii/ Medium
• https://leetcode.com/problems/elimination-game/ 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

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/ Medium Array
  • 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

• CycleSort

  • https://leetcode.com/problems/missing-number/ Easy
  • https://leetcode.com/problems/set-mismatch/ Easy
  • 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

• 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/ Hard Recommended
• 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/ Medium Recommended
• 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

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/ Medium Recommended
• 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/ Medium Recommended
• https://leetcode.com/problems/string-to-integer-atoi/ Medium Recommended
• 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

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

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

Two Pointers

• https://leetcode.com/problems/push-dominoes/ 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 ValueBinary 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

• 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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