316 docs tagged with "Leetcode Medium"

https://leetcode.com/problems/max-consecutive-ones-iii/

https://leetcode.com/problems/binary-tree-level-order-traversal

https://leetcode.com/problems/number-of-enclaves/

https://leetcode.com/problems/binary-tree-zigzag-level-order-traversal/

Python

https://leetcode.com/problems/construct-binary-tree-from-preorder-and-inorder-traversal

https://leetcode.com/problems/construct-binary-tree-from-inorder-and-postorder-traversal

https://leetcode.com/problems/convert-sorted-list-to-binary-search-tree/

https://leetcode.com/problems/shortest-path-in-binary-matrix/

Python

https://leetcode.com/problems/container-with-most-water/

https://leetcode.com/problems/path-sum-ii/

https://leetcode.com/problems/flatten-binary-tree-to-linked-list

https://leetcode.com/problems/longest-common-subsequence/

Python

https://leetcode.com/problems/populating-next-right-pointers-in-each-node

https://leetcode.com/problems/maximum-level-sum-of-a-binary-tree

https://leetcode.com/problems/minimum-cost-to-connect-sticks/

https://leetcode.com/problems/populating-next-right-pointers-in-each-node-ii

https://leetcode.com/problems/integer-to-roman/

Python

https://leetcode.com/problems/smallest-string-with-swaps/

Python

https://leetcode.com/problems/longest-arithmetic-subsequence-of-given-difference/

https://leetcode.com/problems/best-time-to-buy-and-sell-stock-ii

https://leetcode.com/problems/maximum-length-of-a-concatenated-string-with-unique-characters/

https://leetcode.com/problems/minimum-remove-to-make-valid-parentheses/

https://leetcode.com/problems/number-of-closed-islands

https://leetcode.com/problems/search-suggestions-system/

https://leetcode.com/problems/longest-consecutive-sequence/

https://leetcode.com/problems/remove-covered-intervals/

Python

https://leetcode.com/problems/surrounded-regions

https://leetcode.com/problems/deepest-leaves-sum/

Python

Python

https://leetcode.com/problems/palindrome-partitioning

https://leetcode.com/problems/minimum-flips-to-make-a-or-b-equal-to-c

https://leetcode.com/problems/break-a-palindrome/

Python

https://leetcode.com/problems/clone-graph

https://leetcode.com/problems/reduce-array-size-to-the-half/

https://leetcode.com/problems/maximum-product-of-splitted-binary-tree/

https://leetcode.com/problems/single-number-ii/

https://leetcode.com/problems/find-a-corresponding-node-of-a-binary-tree-in-a-clone-of-that-tree/

https://leetcode.com/problems/balance-a-binary-search-tree

https://leetcode.com/problems/word-break/

https://leetcode.com/problems/design-underground-system/

https://leetcode.com/problems/linked-list-cycle-ii

https://leetcode.com/problems/maximum-points-you-can-obtain-from-cards/

https://leetcode.com/problems/diagonal-traverse-ii

https://leetcode.com/problems/reorder-list/

https://leetcode.com/problems/count-good-nodes-in-binary-tree/

https://leetcode.com/problems/pseudo-palindromic-paths-in-a-binary-tree/

https://leetcode.com/problems/lru-cache/

https://leetcode.com/problems/check-if-a-string-contains-all-binary-codes-of-size-k/

https://leetcode.com/problems/maximum-area-of-a-piece-of-cake-after-horizontal-and-vertical-cuts/

https://leetcode.com/problems/insertion-sort-list

https://leetcode.com/problems/sort-list/

https://leetcode.com/problems/longest-subarray-of-1s-after-deleting-one-element/

https://leetcode.com/problems/number-of-subsequences-that-satisfy-the-given-sum-condition/

https://leetcode.com/problems/3sum

https://leetcode.com/problems/reverse-words-in-a-string/

https://leetcode.com/problems/number-of-nodes-in-the-sub-tree-with-the-same-label/description/

https://leetcode.com/problems/maximum-product-subarray

https://leetcode.com/problems/find-minimum-in-rotated-sorted-array

https://leetcode.com/problems/min-cost-to-connect-all-points/

https://leetcode.com/problems/minimum-number-of-vertices-to-reach-all-nodes/

https://leetcode.com/problems/minimum-time-to-make-rope-colorful/

https://leetcode.com/problems/3sum-closest/

https://leetcode.com/problems/one-edit-distance

Python

https://leetcode.com/problems/arithmetic-subarrays/

Python

https://leetcode.com/problems/count-sorted-vowel-strings/

https://leetcode.com/problems/lowest-common-ancestor-of-a-binary-tree-ii/

https://leetcode.com/problems/minimum-deletions-to-make-character-frequencies-unique/

Python

https://leetcode.com/problems/lowest-common-ancestor-of-a-binary-tree-iii/

Python

https://leetcode.com/problems/max-number-of-k-sum-pairs/

https://leetcode.com/problems/concatenation-of-consecutive-binary-numbers/

https://leetcode.com/problems/partitioning-into-minimum-number-of-deci-binary-numbers/

https://leetcode.com/problems/maximum-erasure-value/

https://leetcode.com/problems/jump-game-vi/

https://leetcode.com/problems/letter-combinations-of-a-phone-number/

https://leetcode.com/problems/where-will-the-ball-fall/

https://mech.run/docs/leetcode/1-500/swapnodesin_pairs

Python

MySQL

https://leetcode.com/problems/nth-highest-salary

Python

Python

https://leetcode.com/problems/repeated-dna-sequences/

https://leetcode.com/problems/minimum-speed-to-arrive-on-time/

https://leetcode.com/problems/rotate-array

https://leetcode.com/problems/remove-nth-node-from-end-of-list

https://leetcode.com/problems/number-of-1-bits/

https://leetcode.com/problems/maximum-alternating-subsequence-sum/

https://leetcode.com/problems/house-robber

https://leetcode.com/problems/binary-tree-right-side-view/

https://leetcode.com/problems/the-number-of-weak-characters-in-the-game/

https://leetcode.com/problems/add-two-numbers

https://leetcode.com/problems/number-of-islands/

https://leetcode.com/problems/find-original-array-from-doubled-array/

https://leetcode.com/problems/remove-colored-pieces-if-both-neighbors-are-the-same-color/

https://leetcode.com/problems/course-schedule/

https://leetcode.com/problems/implement-trie-prefix-tree/

https://leetcode.com/problems/minimum-size-subarray-sum

https://leetcode.com/problems/delete-the-middle-node-of-a-linked-list/submissions/

https://leetcode.com/problems/design-add-and-search-words-data-structure/

Python

https://leetcode.com/problems/longest-palindrome-by-concatenating-two-letter-words/

https://leetcode.com/problems/solving-questions-with-brainpower/

https://leetcode.com/problems/kth-largest-element-in-an-array/

https://leetcode.com/problems/combination-sum-iii/

https://leetcode.com/problems/generate-parentheses/

https://leetcode.com/problems/count-complete-tree-nodes

https://leetcode.com/problems/rectangle-area/

https://leetcode.com/problems/majority-element-ii

https://leetcode.com/problems/kth-smallest-element-in-a-bst

https://leetcode.com/problems/successful-pairs-of-spells-and-potions

https://leetcode.com/problems/fair-distribution-of-cookies

https://leetcode.com/problems/number-of-zero-filled-subarrays

https://leetcode.com/problems/lowest-common-ancestor-of-a-binary-tree

https://leetcode.com/problems/delete-node-in-a-linked-list/

https://leetcode.com/problems/product-of-array-except-self/

https://leetcode.com/problems/swap-nodes-in-pairs

https://leetcode.com/problems/search-a-2d-matrix-ii/

Python

https://leetcode.com/problems/minimize-maximum-of-array

https://leetcode.com/problems/minimum-fuel-cost-to-report-to-the-capital

https://leetcode.com/problems/count-univalue-subtrees

https://leetcode.com/problems/meeting-rooms-ii/

https://leetcode.com/problems/single-number-iii

https://leetcode.com/problems/check-if-object-instance-of-class

https://leetcode.com/problems/cache-with-time-limit/

https://leetcode.com/problems/memoize

https://leetcode.com/problems/flatten-deeply-nested-array/

https://leetcode.com/problems/debounce/

https://leetcode.com/problems/group-by

https://leetcode.com/problems/curry

https://leetcode.com/problems/promise-pool/

https://leetcode.com/problems/nested-array-generator

https://leetcode.com/problems/array-of-objects-to-matrix

https://leetcode.com/problems/throttle/

https://leetcode.com/problems/call-function-with-custom-context

https://leetcode.com/problems/event-emitter/

https://leetcode.com/problems/differences-between-two-objects/

https://leetcode.com/problems/find-the-index-of-the-first-occurrence-in-a-string

https://leetcode.com/problems/peeking-iterator/

https://leetcode.com/problems/game-of-life/

https://leetcode.com/problems/divide-two-integers/

https://leetcode.com/problems/divide-array-into-arrays-with-max-difference

https://leetcode.com/problems/bulls-and-cows/

https://leetcode.com/problems/longest-substring-without-repeating-characters

https://leetcode.com/problems/longest-increasing-subsequence/

https://leetcode.com/problems/range-sum-query-2d-immutable/

https://leetcode.com/problems/range-sum-query-mutable/

https://leetcode.com/problems/next-permutation/

https://leetcode.com/problems/binary-tree-vertical-order-traversal/

https://leetcode.com/problems/maximum-product-of-word-lengths/

Python

https://leetcode.com/problems/coin-change/

https://leetcode.com/problems/odd-even-linked-list

https://leetcode.com/problems/search-in-rotated-sorted-array

https://leetcode.com/problems/increasing-triplet-subsequence/

https://leetcode.com/problems/house-robber-iii/

https://leetcode.com/problems/find-first-and-last-position-of-element-in-sorted-array/

https://leetcode.com/problems/flatten-nested-list-iterator/

https://leetcode.com/problems/flatten-nested-list-iterator

Python

https://leetcode.com/problems/top-k-frequent-elements/

https://leetcode.com/problems/valid-sudoku

https://leetcode.com/problems/sum-of-two-integers/

https://leetcode.com/problems/wiggle-subsequence/

https://leetcode.com/problems/combination-sum-iv/

Python

https://leetcode.com/problems/insert-delete-getrandom-o1

https://leetcode.com/problems/linked-list-random-node

https://leetcode.com/problems/combination-sum/

https://leetcode.com/problems/decode-string/

https://leetcode.com/problems/evaluate-division/

https://leetcode.com/problems/queue-reconstruction-by-height/solution/

https://leetcode.com/problems/arithmetic-slices/

https://leetcode.com/problems/partition-equal-subset-sum

https://leetcode.com/problems/pacific-atlantic-water-flow/

https://leetcode.com/problems/maximum-xor-of-two-numbers-in-an-array

https://leetcode.com/problems/longest-repeating-character-replacement/

https://leetcode.com/problems/n-ary-tree-level-order-traversal/

https://leetcode.com/problems/multiply-strings

https://leetcode.com/problems/flatten-a-multilevel-doubly-linked-list

https://leetcode.com/problems/non-overlapping-intervals/

Python

https://leetcode.com/problems/find-all-anagrams-in-a-string/

https://leetcode.com/problems/string-compression/

https://leetcode.com/problems/add-two-numbers-ii/

Python

https://leetcode.com/problems/delete-node-in-a-bst

https://leetcode.com/problems/sort-characters-by-frequency/

https://leetcode.com/problems/minimum-number-of-arrows-to-burst-balloons

https://leetcode.com/problems/minimum-moves-to-equal-array-elements/

https://leetcode.com/problems/132-pattern/

https://leetcode.com/problems/permutations/

https://leetcode.com/problems/minimum-moves-to-equal-array-elements-ii/

https://leetcode.com/problems/permutations-ii/

https://leetcode.com/problems/matchsticks-to-square/

https://leetcode.com/problems/rotate-image/

https://leetcode.com/problems/max-consecutive-ones-ii

https://leetcode.com/problems/group-anagrams/

https://leetcode.com/problems/target-sum/

https://leetcode.com/problems/diagonal-traverse

https://leetcode.com/problems/longest-palindromic-substring/

https://leetcode.com/problems/powx-n/

https://leetcode.com/problems/longest-palindromic-subsequence/

https://leetcode.com/problems/coin-change-2/

https://leetcode.com/problems/continuous-subarray-sum/

https://leetcode.com/problems/contiguous-array/

https://leetcode.com/problems/random-pick-with-weight/

Python

https://leetcode.com/problems/convert-bst-to-greater-tree/

https://leetcode.com/problems/spiral-matrix/

https://leetcode.com/problems/single-element-in-a-sorted-array

https://leetcode.com/problems/jump-game/

https://leetcode.com/problems/merge-intervals/

https://leetcode.com/problems/subarray-sum-equals-k/

https://leetcode.com/problems/permutation-in-string/

https://leetcode.com/problems/insert-interval/

https://leetcode.com/problems/out-of-boundary-paths/

https://leetcode.com/problems/shortest-unsorted-continuous-subarray/

https://leetcode.com/problems/delete-operation-for-two-strings/

Python

https://leetcode.com/problems/zigzag-conversion/

https://leetcode.com/problems/find-duplicate-file-in-system/

https://leetcode.com/problems/rotate-list/

https://leetcode.com/problems/unique-paths/

https://leetcode.com/contest/weekly-contest-315/problems/count-number-of-distinct-integers-after-reverse-operations/

https://leetcode.com/contest/weekly-contest-315/problems/sum-of-number-and-its-reverse/

https://leetcode.com/problems/design-circular-queue/

https://leetcode.com/problems/add-one-row-to-tree/

Python

https://leetcode.com/problems/palindromic-substrings/

Python

Python

https://leetcode.com/problems/find-k-closest-elements/

https://leetcode.com/problems/split-array-into-consecutive-subsequences/

https://leetcode.com/problems/non-decreasing-array/

https://leetcode.com/problems/trim-a-binary-search-tree/

https://leetcode.com/problems/number-of-longest-increasing-subsequence/

https://leetcode.com/problems/knight-probability-in-chessboard/

https://leetcode.com/problems/top-k-frequent-words/

https://leetcode.com/problems/max-area-of-island/

https://leetcode.com/problems/reverse-integer/

Python

https://leetcode.com/problems/kth-largest-element-in-a-stream/

https://leetcode.com/problems/design-linked-list/

https://leetcode.com/problems/simplify-path/

https://leetcode.com/problems/minimum-ascii-delete-sum-for-two-strings/

https://leetcode.com/problems/candy-crush/

https://leetcode.com/problems/find-pivot-index/

https://leetcode.com/problems/my-calendar-i/

Python

https://leetcode.com/problems/search-a-2d-matrix

https://leetcode.com/problems/delete-and-earn/

https://leetcode.com/problems/network-delay-time/

https://leetcode.com/problems/all-paths-from-source-to-target/

https://leetcode.com/problems/partition-labels/

https://leetcode.com/problems/toeplitz-matrix/

https://leetcode.com/problems/combinations/

Recursive

Python

https://leetcode.com/problems/is-graph-bipartite/

https://leetcode.com/problems/cheapest-flights-within-k-stops

https://leetcode.com/problems/word-search/

https://leetcode.com/problems/number-of-matching-subsequences/

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

https://leetcode.com/problems/remove-duplicates-from-sorted-array-ii/

https://leetcode.com/problems/find-eventual-safe-states/

https://leetcode.com/problems/binary-tree-pruning/

https://leetcode.com/problems/remove-duplicates-from-sorted-list-ii/

https://leetcode.com/problems/short-encoding-of-words/

https://leetcode.com/problems/binary-trees-with-factors/

https://leetcode.com/problems/image-overlap/

https://leetcode.com/problems/keys-and-rooms/

https://leetcode.com/problems/peak-index-in-a-mountain-array/

https://leetcode.com/problems/mirror-reflection/

https://leetcode.com/problems/partition-list/

https://leetcode.com/problems/reordered-power-of-2/

https://leetcode.com/problems/minimum-number-of-refueling-stops/

Python

https://leetcode.com/problems/boats-to-save-people

https://leetcode.com/problems/findandreplace_pattern/

https://leetcode.com/problems/all-possible-full-binary-trees/

Python

https://leetcode.com/problems/decode-ways/

https://leetcode.com/problems/sort-an-array/

https://leetcode.com/problems/word-subsets/

https://leetcode.com/problems/reverse-linked-list-ii/

https://leetcode.com/problems/3sum-with-multiplicity/

https://leetcode.com/problems/flip-string-to-monotone-increasing/description/

https://leetcode.com/problems/restore-ip-addresses

https://leetcode.com/problems/minimum-falling-path-sum/

https://leetcode.com/problems/validate-stack-sequences/

https://leetcode.com/problems/unique-binary-search-trees-ii

Python

https://leetcode.com/problems/unique-binary-search-trees

Python

https://leetcode.com/problems/interleaving-string/

https://leetcode.com/problems/k-closest-points-to-origin/

https://leetcode.com/problems/largest-perimeter-triangle/

https://leetcode.com/problems/validate-binary-search-tree

https://leetcode.com/problems/time-based-key-value-store/

https://leetcode.com/problems/minimum-cost-for-tickets/

https://leetcode.com/problems/sum-of-even-numbers-after-queries/

Python

https://leetcode.com/problems/recover-binary-search-tree/