Name	Name	Last commit message	Last commit date
Latest commit History 754 Commits
.github/workflows	.github/workflows
0001-two-sum	0001-two-sum
0002-add-two-numbers	0002-add-two-numbers
0003-longest-substring-without-repeating-characters	0003-longest-substring-without-repeating-characters
0004-median-of-two-sorted-arrays	0004-median-of-two-sorted-arrays
0005-longest-palindromic-substring	0005-longest-palindromic-substring
0006-zigzag-conversion	0006-zigzag-conversion
0007-reverse-integer	0007-reverse-integer
0008-string-to-integer-atoi	0008-string-to-integer-atoi
0009-palindrome-number	0009-palindrome-number
0010-regular-expression-matching	0010-regular-expression-matching
0011-container-with-most-water	0011-container-with-most-water
0012-integer-to-roman	0012-integer-to-roman
0013-roman-to-integer	0013-roman-to-integer
0014-longest-common-prefix	0014-longest-common-prefix
0015-3sum	0015-3sum
0016-3sum-closest	0016-3sum-closest
0017-letter-combinations-of-a-phone-number	0017-letter-combinations-of-a-phone-number
0018-4sum	0018-4sum
0019-remove-nth-node-from-end-of-list	0019-remove-nth-node-from-end-of-list
0020-valid-parentheses	0020-valid-parentheses
0021-merge-two-sorted-lists	0021-merge-two-sorted-lists
0022-generate-parentheses	0022-generate-parentheses
0023-merge-k-sorted-lists	0023-merge-k-sorted-lists
0024-swap-nodes-in-pairs	0024-swap-nodes-in-pairs
0025-reverse-nodes-in-k-group	0025-reverse-nodes-in-k-group
0026-remove-duplicates-from-sorted-array	0026-remove-duplicates-from-sorted-array
0027-remove-element	0027-remove-element
0028-find-the-index-of-the-first-occurrence-in-a-string	0028-find-the-index-of-the-first-occurrence-in-a-string
0029-divide-two-integers	0029-divide-two-integers
0030-substring-with-concatenation-of-all-words	0030-substring-with-concatenation-of-all-words
0031-next-permutation	0031-next-permutation
0032-longest-valid-parentheses	0032-longest-valid-parentheses
0033-search-in-rotated-sorted-array	0033-search-in-rotated-sorted-array
0034-find-first-and-last-position-of-element-in-sorted-array	0034-find-first-and-last-position-of-element-in-sorted-array
0035-search-insert-position	0035-search-insert-position
0036-valid-sudoku	0036-valid-sudoku
0037-sudoku-solver	0037-sudoku-solver
0039-combination-sum	0039-combination-sum
0040-combination-sum-ii	0040-combination-sum-ii
0041-first-missing-positive	0041-first-missing-positive
0042-trapping-rain-water	0042-trapping-rain-water
0045-jump-game-ii	0045-jump-game-ii
0046-permutations	0046-permutations
0048-rotate-image	0048-rotate-image
0049-group-anagrams	0049-group-anagrams
0050-powx-n	0050-powx-n
0051-n-queens	0051-n-queens
0052-n-queens-ii	0052-n-queens-ii
0053-maximum-subarray	0053-maximum-subarray
0054-spiral-matrix	0054-spiral-matrix
0055-jump-game	0055-jump-game
0056-merge-intervals	0056-merge-intervals
0057-insert-interval	0057-insert-interval
0058-length-of-last-word	0058-length-of-last-word
0061-rotate-list	0061-rotate-list
0062-unique-paths	0062-unique-paths
0063-unique-paths-ii	0063-unique-paths-ii
0064-minimum-path-sum	0064-minimum-path-sum
0066-plus-one	0066-plus-one
0067-add-binary	0067-add-binary
0068-text-justification	0068-text-justification
0069-sqrtx	0069-sqrtx
0070-climbing-stairs	0070-climbing-stairs
0071-simplify-path	0071-simplify-path
0072-edit-distance	0072-edit-distance
0073-set-matrix-zeroes	0073-set-matrix-zeroes
0074-search-a-2d-matrix	0074-search-a-2d-matrix
0075-sort-colors	0075-sort-colors
0076-minimum-window-substring	0076-minimum-window-substring
0077-combinations	0077-combinations
0078-subsets	0078-subsets
0079-word-search	0079-word-search
0080-remove-duplicates-from-sorted-array-ii	0080-remove-duplicates-from-sorted-array-ii
0082-remove-duplicates-from-sorted-list-ii	0082-remove-duplicates-from-sorted-list-ii
0083-remove-duplicates-from-sorted-list	0083-remove-duplicates-from-sorted-list
0084-largest-rectangle-in-histogram	0084-largest-rectangle-in-histogram
0086-partition-list	0086-partition-list
0088-merge-sorted-array	0088-merge-sorted-array
0092-reverse-linked-list-ii	0092-reverse-linked-list-ii
0094-binary-tree-inorder-traversal	0094-binary-tree-inorder-traversal
0097-interleaving-string	0097-interleaving-string
0098-validate-binary-search-tree	0098-validate-binary-search-tree
0100-same-tree	0100-same-tree
0101-symmetric-tree	0101-symmetric-tree
0102-binary-tree-level-order-traversal	0102-binary-tree-level-order-traversal
0103-binary-tree-zigzag-level-order-traversal	0103-binary-tree-zigzag-level-order-traversal
0104-maximum-depth-of-binary-tree	0104-maximum-depth-of-binary-tree
0105-construct-binary-tree-from-preorder-and-inorder-traversal	0105-construct-binary-tree-from-preorder-and-inorder-traversal
0106-construct-binary-tree-from-inorder-and-postorder-traversal	0106-construct-binary-tree-from-inorder-and-postorder-traversal
0108-convert-sorted-array-to-binary-search-tree	0108-convert-sorted-array-to-binary-search-tree
0110-balanced-binary-tree	0110-balanced-binary-tree
0111-minimum-depth-of-binary-tree	0111-minimum-depth-of-binary-tree
0112-path-sum	0112-path-sum
0114-flatten-binary-tree-to-linked-list	0114-flatten-binary-tree-to-linked-list
0117-populating-next-right-pointers-in-each-node-ii	0117-populating-next-right-pointers-in-each-node-ii
0118-pascals-triangle	0118-pascals-triangle
0119-pascals-triangle-ii	0119-pascals-triangle-ii
0120-triangle	0120-triangle
0121-best-time-to-buy-and-sell-stock	0121-best-time-to-buy-and-sell-stock

LeetCode-Multiverse

Collection of LeetCode questions & solutions.

LeetCode Topics

Array


0001-two-sum
0004-median-of-two-sorted-arrays
0011-container-with-most-water
0015-3sum
0016-3sum-closest
0018-4sum
0026-remove-duplicates-from-sorted-array
0027-remove-element
0031-next-permutation
0033-search-in-rotated-sorted-array
0034-find-first-and-last-position-of-element-in-sorted-array
0035-search-insert-position
0036-valid-sudoku
0037-sudoku-solver
0039-combination-sum
0040-combination-sum-ii
0041-first-missing-positive
0042-trapping-rain-water
0045-jump-game-ii
0046-permutations
0048-rotate-image
0049-group-anagrams
0051-n-queens
0053-maximum-subarray
0054-spiral-matrix
0055-jump-game
0056-merge-intervals
0057-insert-interval
0063-unique-paths-ii
0064-minimum-path-sum
0066-plus-one
0068-text-justification
0073-set-matrix-zeroes
0074-search-a-2d-matrix
0075-sort-colors
0078-subsets
0079-word-search
0080-remove-duplicates-from-sorted-array-ii
0084-largest-rectangle-in-histogram
0088-merge-sorted-array
0105-construct-binary-tree-from-preorder-and-inorder-traversal
0106-construct-binary-tree-from-inorder-and-postorder-traversal
0108-convert-sorted-array-to-binary-search-tree
0118-pascals-triangle
0119-pascals-triangle-ii
0120-triangle
0121-best-time-to-buy-and-sell-stock
0122-best-time-to-buy-and-sell-stock-ii
0123-best-time-to-buy-and-sell-stock-iii
0128-longest-consecutive-sequence
0130-surrounded-regions
0134-gas-station
0135-candy
0136-single-number
0137-single-number-ii
0139-word-break
0149-max-points-on-a-line
0150-evaluate-reverse-polish-notation
0152-maximum-product-subarray
0153-find-minimum-in-rotated-sorted-array
0162-find-peak-element
0167-two-sum-ii-input-array-is-sorted
0169-majority-element
0188-best-time-to-buy-and-sell-stock-iv
0189-rotate-array
0198-house-robber
0200-number-of-islands
0209-minimum-size-subarray-sum
0212-word-search-ii
0215-kth-largest-element-in-an-array
0216-combination-sum-iii
0217-contains-duplicate
0219-contains-duplicate-ii
0221-maximal-square
0228-summary-ranges
0238-product-of-array-except-self
0239-sliding-window-maximum
0240-search-a-2d-matrix-ii
0274-h-index
0283-move-zeroes
0287-find-the-duplicate-number
0289-game-of-life
0300-longest-increasing-subsequence
0303-range-sum-query-immutable
0307-range-sum-query-mutable
0322-coin-change
0334-increasing-triplet-subsequence
0347-top-k-frequent-elements
0373-find-k-pairs-with-smallest-sums
0380-insert-delete-getrandom-o1
0399-evaluate-division
0416-partition-equal-subset-sum
0435-non-overlapping-intervals
0452-minimum-number-of-arrows-to-burst-balloons
0502-ipo
0542-01-matrix
0560-subarray-sum-equals-k
0605-can-place-flowers
0621-task-scheduler
0643-maximum-average-subarray-i
0714-best-time-to-buy-and-sell-stock-with-transaction-fee
0721-accounts-merge
0724-find-pivot-index
0733-flood-fill
0735-asteroid-collision
0739-daily-temperatures
0747-min-cost-climbing-stairs
0772-construct-quad-tree
0792-binary-search
0833-bus-routes
0907-koko-eating-bananas
0945-snakes-and-ladders
0954-maximum-sum-circular-subarray
1014-k-closest-points-to-origin
1036-rotting-oranges
1046-max-consecutive-ones-iii
1305-number-of-visible-people-in-a-queue
1319-unique-number-of-occurrences
1392-find-the-difference-of-two-arrays
1397-search-suggestions-system
1438-longest-continuous-subarray-with-absolute-diff-less-than-or-equal-to-limit
1483-rank-teams-by-votes
1528-kids-with-the-greatest-number-of-candies
1586-longest-subarray-of-1s-after-deleting-one-element
1798-max-number-of-k-sum-pairs
1833-find-the-highest-altitude
1876-map-of-highest-peak
1878-check-if-array-is-sorted-and-rotated
2038-nearest-exit-from-entrance-in-maze
2102-find-the-middle-index-in-array
2392-successful-pairs-of-spells-and-potions
2428-equal-row-and-column-pairs
2553-total-cost-to-hire-k-workers
2636-maximum-subsequence-score
3820-number-of-unique-xor-triplets-ii
3824-number-of-unique-xor-triplets-i
3846-minimum-operations-to-make-array-sum-divisible-by-k

Dynamic Programming


0005-longest-palindromic-substring
0022-generate-parentheses
0032-longest-valid-parentheses
0042-trapping-rain-water
0045-jump-game-ii
0053-maximum-subarray
0055-jump-game
0062-unique-paths
0063-unique-paths-ii
0064-minimum-path-sum
0070-climbing-stairs
0072-edit-distance
0097-interleaving-string
0118-pascals-triangle
0119-pascals-triangle-ii
0120-triangle
0121-best-time-to-buy-and-sell-stock
0122-best-time-to-buy-and-sell-stock-ii
0123-best-time-to-buy-and-sell-stock-iii
0124-binary-tree-maximum-path-sum
0131-palindrome-partitioning
0139-word-break
0152-maximum-product-subarray
0188-best-time-to-buy-and-sell-stock-iv
0198-house-robber
0221-maximal-square
0279-perfect-squares
0300-longest-increasing-subsequence
0322-coin-change
0338-counting-bits
0392-is-subsequence
0416-partition-equal-subset-sum
0435-non-overlapping-intervals
0542-01-matrix
0678-valid-parenthesis-string
0714-best-time-to-buy-and-sell-stock-with-transaction-fee
0747-min-cost-climbing-stairs
0806-domino-and-tromino-tiling
0954-maximum-sum-circular-subarray
1236-n-th-tribonacci-number
1250-longest-common-subsequence
1474-longest-zigzag-path-in-a-binary-tree
1586-longest-subarray-of-1s-after-deleting-one-element

Greedy


0011-container-with-most-water
0045-jump-game-ii
0055-jump-game
0122-best-time-to-buy-and-sell-stock-ii
0134-gas-station
0135-candy
0334-increasing-triplet-subsequence
0409-longest-palindrome
0435-non-overlapping-intervals
0452-minimum-number-of-arrows-to-burst-balloons
0502-ipo
0605-can-place-flowers
0621-task-scheduler
0649-dota2-senate
0678-valid-parenthesis-string
0714-best-time-to-buy-and-sell-stock-with-transaction-fee
0768-partition-labels
2636-maximum-subsequence-score

Hash Table


0001-two-sum
0003-longest-substring-without-repeating-characters
0012-integer-to-roman
0013-roman-to-integer
0017-letter-combinations-of-a-phone-number
0030-substring-with-concatenation-of-all-words
0036-valid-sudoku
0037-sudoku-solver
0041-first-missing-positive
0049-group-anagrams
0073-set-matrix-zeroes
0076-minimum-window-substring
0105-construct-binary-tree-from-preorder-and-inorder-traversal
0106-construct-binary-tree-from-inorder-and-postorder-traversal
0127-word-ladder
0128-longest-consecutive-sequence
0133-clone-graph
0138-copy-list-with-random-pointer
0139-word-break
0141-linked-list-cycle
0142-linked-list-cycle-ii
0146-lru-cache
0149-max-points-on-a-line
0160-intersection-of-two-linked-lists
0169-majority-element
0202-happy-number
0205-isomorphic-strings
0208-implement-trie-prefix-tree
0217-contains-duplicate
0219-contains-duplicate-ii
0242-valid-anagram
0290-word-pattern
0347-top-k-frequent-elements
0380-insert-delete-getrandom-o1
0383-ransom-note
0387-first-unique-character-in-a-string
0409-longest-palindrome
0432-all-oone-data-structure
0433-minimum-genetic-mutation
0438-find-all-anagrams-in-a-string
0560-subarray-sum-equals-k
0567-permutation-in-string
0621-task-scheduler
0721-accounts-merge
0768-partition-labels
0833-bus-routes
1023-time-based-key-value-store
1319-unique-number-of-occurrences
1392-find-the-difference-of-two-arrays
1483-rank-teams-by-votes
1777-determine-if-two-strings-are-close
1798-max-number-of-k-sum-pairs
2413-smallest-number-in-infinite-set
2428-equal-row-and-column-pairs

Divide and Conquer


0004-median-of-two-sorted-arrays
0023-merge-k-sorted-lists
0053-maximum-subarray
0105-construct-binary-tree-from-preorder-and-inorder-traversal
0106-construct-binary-tree-from-inorder-and-postorder-traversal
0108-convert-sorted-array-to-binary-search-tree
0148-sort-list
0169-majority-element
0190-reverse-bits
0191-number-of-1-bits
0215-kth-largest-element-in-an-array
0240-search-a-2d-matrix-ii
0347-top-k-frequent-elements
0772-construct-quad-tree
0954-maximum-sum-circular-subarray
1014-k-closest-points-to-origin

Sorting


0015-3sum
0016-3sum-closest
0018-4sum
0049-group-anagrams
0056-merge-intervals
0075-sort-colors
0088-merge-sorted-array
0148-sort-list
0169-majority-element
0215-kth-largest-element-in-an-array
0217-contains-duplicate
0242-valid-anagram
0274-h-index
0295-find-median-from-data-stream
0347-top-k-frequent-elements
0435-non-overlapping-intervals
0452-minimum-number-of-arrows-to-burst-balloons
0502-ipo
0621-task-scheduler
0721-accounts-merge
1014-k-closest-points-to-origin
1397-search-suggestions-system
1483-rank-teams-by-votes
1777-determine-if-two-strings-are-close
1798-max-number-of-k-sum-pairs
2392-successful-pairs-of-spells-and-potions
2636-maximum-subsequence-score

Counting


0169-majority-element
0347-top-k-frequent-elements
0383-ransom-note
0387-first-unique-character-in-a-string
0621-task-scheduler
1483-rank-teams-by-votes
1777-determine-if-two-strings-are-close

Math


0002-add-two-numbers
0009-palindrome-number
0012-integer-to-roman
0013-roman-to-integer
0029-divide-two-integers
0048-rotate-image
0050-powx-n
0062-unique-paths
0066-plus-one
0067-add-binary
0069-sqrtx
0070-climbing-stairs
0149-max-points-on-a-line
0150-evaluate-reverse-polish-notation
0168-excel-sheet-column-title
0171-excel-sheet-column-number
0172-factorial-trailing-zeroes
0189-rotate-array
0202-happy-number
0224-basic-calculator
0279-perfect-squares
0380-insert-delete-getrandom-o1
1014-k-closest-points-to-origin
1146-greatest-common-divisor-of-strings
1236-n-th-tribonacci-number
3820-number-of-unique-xor-triplets-ii
3824-number-of-unique-xor-triplets-i
3846-minimum-operations-to-make-array-sum-divisible-by-k

Two Pointers


0005-longest-palindromic-substring
0011-container-with-most-water
0015-3sum
0016-3sum-closest
0018-4sum
0019-remove-nth-node-from-end-of-list
0026-remove-duplicates-from-sorted-array
0027-remove-element
0028-find-the-index-of-the-first-occurrence-in-a-string
0031-next-permutation
0042-trapping-rain-water
0061-rotate-list
0075-sort-colors
0080-remove-duplicates-from-sorted-array-ii
0082-remove-duplicates-from-sorted-list-ii
0086-partition-list
0088-merge-sorted-array
0125-valid-palindrome
0141-linked-list-cycle
0142-linked-list-cycle-ii
0148-sort-list
0151-reverse-words-in-a-string
0160-intersection-of-two-linked-lists
0167-two-sum-ii-input-array-is-sorted
0189-rotate-array
0202-happy-number
0234-palindrome-linked-list
0283-move-zeroes
0287-find-the-duplicate-number
0295-find-median-from-data-stream
0345-reverse-vowels-of-a-string
0392-is-subsequence
0443-string-compression
0567-permutation-in-string
0768-partition-labels
0908-middle-of-the-linked-list
1798-max-number-of-k-sum-pairs
1894-merge-strings-alternately
2216-delete-the-middle-node-of-a-linked-list
2236-maximum-twin-sum-of-a-linked-list
2392-successful-pairs-of-spells-and-potions
2553-total-cost-to-hire-k-workers

Counting Sort


0274-h-index

Design


0146-lru-cache
0155-min-stack
0173-binary-search-tree-iterator
0208-implement-trie-prefix-tree
0211-design-add-and-search-words-data-structure
0232-implement-queue-using-stacks
0295-find-median-from-data-stream
0297-serialize-and-deserialize-binary-tree
0303-range-sum-query-immutable
0307-range-sum-query-mutable
0380-insert-delete-getrandom-o1
0432-all-oone-data-structure
0937-online-stock-span
0969-number-of-recent-calls
1023-time-based-key-value-store
2413-smallest-number-in-infinite-set

Randomized


0380-insert-delete-getrandom-o1

Prefix Sum


0209-minimum-size-subarray-sum
0238-product-of-array-except-self
0303-range-sum-query-immutable
0560-subarray-sum-equals-k
0724-find-pivot-index
1046-max-consecutive-ones-iii
1833-find-the-highest-altitude
2102-find-the-middle-index-in-array

Stack


0020-valid-parentheses
0032-longest-valid-parentheses
0042-trapping-rain-water
0071-simplify-path
0084-largest-rectangle-in-histogram
0094-binary-tree-inorder-traversal
0114-flatten-binary-tree-to-linked-list
0144-binary-tree-preorder-traversal
0145-binary-tree-postorder-traversal
0150-evaluate-reverse-polish-notation
0155-min-stack
0173-binary-search-tree-iterator
0224-basic-calculator
0232-implement-queue-using-stacks
0234-palindrome-linked-list
0394-decode-string
0678-valid-parenthesis-string
0735-asteroid-collision
0739-daily-temperatures
0937-online-stock-span
1305-number-of-visible-people-in-a-queue
2236-maximum-twin-sum-of-a-linked-list
2470-removing-stars-from-a-string

Monotonic Stack


0042-trapping-rain-water
0084-largest-rectangle-in-histogram
0739-daily-temperatures
0937-online-stock-span
1305-number-of-visible-people-in-a-queue

String


0003-longest-substring-without-repeating-characters
0005-longest-palindromic-substring
0006-zigzag-conversion
0012-integer-to-roman
0013-roman-to-integer
0014-longest-common-prefix
0017-letter-combinations-of-a-phone-number
0020-valid-parentheses
0022-generate-parentheses
0028-find-the-index-of-the-first-occurrence-in-a-string
0030-substring-with-concatenation-of-all-words
0032-longest-valid-parentheses
0049-group-anagrams
0058-length-of-last-word
0067-add-binary
0068-text-justification
0071-simplify-path
0072-edit-distance
0076-minimum-window-substring
0079-word-search
0097-interleaving-string
0125-valid-palindrome
0127-word-ladder
0131-palindrome-partitioning
0139-word-break
0151-reverse-words-in-a-string
0168-excel-sheet-column-title
0171-excel-sheet-column-number
0205-isomorphic-strings
0208-implement-trie-prefix-tree
0211-design-add-and-search-words-data-structure
0212-word-search-ii
0224-basic-calculator
0242-valid-anagram
0290-word-pattern
0297-serialize-and-deserialize-binary-tree
0345-reverse-vowels-of-a-string
0383-ransom-note
0387-first-unique-character-in-a-string
0392-is-subsequence
0394-decode-string
0399-evaluate-division
0409-longest-palindrome
0433-minimum-genetic-mutation
0438-find-all-anagrams-in-a-string
0443-string-compression
0567-permutation-in-string
0649-dota2-senate
0678-valid-parenthesis-string
0721-accounts-merge
0768-partition-labels
1023-time-based-key-value-store
1146-greatest-common-divisor-of-strings
1250-longest-common-subsequence
1397-search-suggestions-system
1483-rank-teams-by-votes
1567-maximum-number-of-vowels-in-a-substring-of-given-length
1777-determine-if-two-strings-are-close
1894-merge-strings-alternately
2470-removing-stars-from-a-string

Trie


0014-longest-common-prefix
0139-word-break
0208-implement-trie-prefix-tree
0211-design-add-and-search-words-data-structure
0212-word-search-ii
1397-search-suggestions-system

String Matching


0028-find-the-index-of-the-first-occurrence-in-a-string

Simulation


0054-spiral-matrix
0067-add-binary
0068-text-justification
0289-game-of-life
0735-asteroid-collision
2428-equal-row-and-column-pairs
2470-removing-stars-from-a-string
2553-total-cost-to-hire-k-workers

Binary Search


0004-median-of-two-sorted-arrays
0033-search-in-rotated-sorted-array
0034-find-first-and-last-position-of-element-in-sorted-array
0035-search-insert-position
0069-sqrtx
0074-search-a-2d-matrix
0153-find-minimum-in-rotated-sorted-array
0162-find-peak-element
0167-two-sum-ii-input-array-is-sorted
0209-minimum-size-subarray-sum
0222-count-complete-tree-nodes
0240-search-a-2d-matrix-ii
0278-first-bad-version
0287-find-the-duplicate-number
0300-longest-increasing-subsequence
0374-guess-number-higher-or-lower
0792-binary-search
0907-koko-eating-bananas
1023-time-based-key-value-store
1046-max-consecutive-ones-iii
1397-search-suggestions-system
2392-successful-pairs-of-spells-and-potions

Sliding Window


0003-longest-substring-without-repeating-characters
0030-substring-with-concatenation-of-all-words
0076-minimum-window-substring
0209-minimum-size-subarray-sum
0219-contains-duplicate-ii
0239-sliding-window-maximum
0438-find-all-anagrams-in-a-string
0567-permutation-in-string
0643-maximum-average-subarray-i
1046-max-consecutive-ones-iii
1438-longest-continuous-subarray-with-absolute-diff-less-than-or-equal-to-limit
1567-maximum-number-of-vowels-in-a-substring-of-given-length
1586-longest-subarray-of-1s-after-deleting-one-element

Matrix


0036-valid-sudoku
0037-sudoku-solver
0048-rotate-image
0054-spiral-matrix
0063-unique-paths-ii
0064-minimum-path-sum
0073-set-matrix-zeroes
0074-search-a-2d-matrix
0079-word-search
0130-surrounded-regions
0200-number-of-islands
0212-word-search-ii
0221-maximal-square
0240-search-a-2d-matrix-ii
0289-game-of-life
0542-01-matrix
0733-flood-fill
0772-construct-quad-tree
0945-snakes-and-ladders
1036-rotting-oranges
1876-map-of-highest-peak
2038-nearest-exit-from-entrance-in-maze
2428-equal-row-and-column-pairs

Union Find


0128-longest-consecutive-sequence
0130-surrounded-regions
0200-number-of-islands
0399-evaluate-division
0547-number-of-provinces
0721-accounts-merge

Recursion


0002-add-two-numbers
0021-merge-two-sorted-lists
0024-swap-nodes-in-pairs
0025-reverse-nodes-in-k-group
0050-powx-n
0203-remove-linked-list-elements
0206-reverse-linked-list
0224-basic-calculator
0234-palindrome-linked-list
0394-decode-string

Linked List


0002-add-two-numbers
0019-remove-nth-node-from-end-of-list
0021-merge-two-sorted-lists
0023-merge-k-sorted-lists
0024-swap-nodes-in-pairs
0025-reverse-nodes-in-k-group
0061-rotate-list
0082-remove-duplicates-from-sorted-list-ii
0083-remove-duplicates-from-sorted-list
0086-partition-list
0092-reverse-linked-list-ii
0114-flatten-binary-tree-to-linked-list
0117-populating-next-right-pointers-in-each-node-ii
0138-copy-list-with-random-pointer
0141-linked-list-cycle
0142-linked-list-cycle-ii
0146-lru-cache
0148-sort-list
0160-intersection-of-two-linked-lists
0203-remove-linked-list-elements
0206-reverse-linked-list
0234-palindrome-linked-list
0328-odd-even-linked-list
0432-all-oone-data-structure
0725-split-linked-list-in-parts
0908-middle-of-the-linked-list
2216-delete-the-middle-node-of-a-linked-list
2236-maximum-twin-sum-of-a-linked-list

Doubly-Linked List


0146-lru-cache
0432-all-oone-data-structure

Tree


0094-binary-tree-inorder-traversal
0098-validate-binary-search-tree
0100-same-tree
0101-symmetric-tree
0102-binary-tree-level-order-traversal
0103-binary-tree-zigzag-level-order-traversal
0104-maximum-depth-of-binary-tree
0105-construct-binary-tree-from-preorder-and-inorder-traversal
0106-construct-binary-tree-from-inorder-and-postorder-traversal
0108-convert-sorted-array-to-binary-search-tree
0110-balanced-binary-tree
0111-minimum-depth-of-binary-tree
0112-path-sum
0114-flatten-binary-tree-to-linked-list
0117-populating-next-right-pointers-in-each-node-ii
0124-binary-tree-maximum-path-sum
0129-sum-root-to-leaf-numbers
0144-binary-tree-preorder-traversal
0145-binary-tree-postorder-traversal
0173-binary-search-tree-iterator
0199-binary-tree-right-side-view
0222-count-complete-tree-nodes
0226-invert-binary-tree
0230-kth-smallest-element-in-a-bst
0235-lowest-common-ancestor-of-a-binary-search-tree
0236-lowest-common-ancestor-of-a-binary-tree
0297-serialize-and-deserialize-binary-tree
0437-path-sum-iii
0450-delete-node-in-a-bst
0530-minimum-absolute-difference-in-bst
0543-diameter-of-binary-tree
0637-average-of-levels-in-binary-tree
0772-construct-quad-tree
0783-search-in-a-binary-search-tree
0904-leaf-similar-trees
1116-maximum-level-sum-of-a-binary-tree
1474-longest-zigzag-path-in-a-binary-tree
1544-count-good-nodes-in-binary-tree

Depth-First Search


0079-word-search
0094-binary-tree-inorder-traversal
0098-validate-binary-search-tree
0100-same-tree
0101-symmetric-tree
0104-maximum-depth-of-binary-tree
0110-balanced-binary-tree
0111-minimum-depth-of-binary-tree
0112-path-sum
0114-flatten-binary-tree-to-linked-list
0117-populating-next-right-pointers-in-each-node-ii
0124-binary-tree-maximum-path-sum
0129-sum-root-to-leaf-numbers
0130-surrounded-regions
0133-clone-graph
0144-binary-tree-preorder-traversal
0145-binary-tree-postorder-traversal
0199-binary-tree-right-side-view
0200-number-of-islands
0207-course-schedule
0210-course-schedule-ii
0211-design-add-and-search-words-data-structure
0226-invert-binary-tree
0230-kth-smallest-element-in-a-bst
0235-lowest-common-ancestor-of-a-binary-search-tree
0236-lowest-common-ancestor-of-a-binary-tree
0297-serialize-and-deserialize-binary-tree
0310-minimum-height-trees
0399-evaluate-division
0437-path-sum-iii
0530-minimum-absolute-difference-in-bst
0543-diameter-of-binary-tree
0547-number-of-provinces
0637-average-of-levels-in-binary-tree
0721-accounts-merge
0733-flood-fill
0871-keys-and-rooms
0904-leaf-similar-trees
1116-maximum-level-sum-of-a-binary-tree
1474-longest-zigzag-path-in-a-binary-tree
1544-count-good-nodes-in-binary-tree
1576-reorder-routes-to-make-all-paths-lead-to-the-city-zero

Breadth-First Search


0100-same-tree
0101-symmetric-tree
0102-binary-tree-level-order-traversal
0103-binary-tree-zigzag-level-order-traversal
0104-maximum-depth-of-binary-tree
0111-minimum-depth-of-binary-tree
0112-path-sum
0117-populating-next-right-pointers-in-each-node-ii
0127-word-ladder
0130-surrounded-regions
0133-clone-graph
0199-binary-tree-right-side-view
0200-number-of-islands
0207-course-schedule
0210-course-schedule-ii
0226-invert-binary-tree
0279-perfect-squares
0297-serialize-and-deserialize-binary-tree
0310-minimum-height-trees
0322-coin-change
0399-evaluate-division
0433-minimum-genetic-mutation
0530-minimum-absolute-difference-in-bst
0542-01-matrix
0547-number-of-provinces
0637-average-of-levels-in-binary-tree
0721-accounts-merge
0733-flood-fill
0833-bus-routes
0871-keys-and-rooms
0945-snakes-and-ladders
1036-rotting-oranges
1116-maximum-level-sum-of-a-binary-tree
1544-count-good-nodes-in-binary-tree
1576-reorder-routes-to-make-all-paths-lead-to-the-city-zero
1876-map-of-highest-peak
2038-nearest-exit-from-entrance-in-maze

Binary Tree


0094-binary-tree-inorder-traversal
0098-validate-binary-search-tree
0100-same-tree
0101-symmetric-tree
0102-binary-tree-level-order-traversal
0103-binary-tree-zigzag-level-order-traversal
0104-maximum-depth-of-binary-tree
0105-construct-binary-tree-from-preorder-and-inorder-traversal
0106-construct-binary-tree-from-inorder-and-postorder-traversal
0108-convert-sorted-array-to-binary-search-tree
0110-balanced-binary-tree
0111-minimum-depth-of-binary-tree
0112-path-sum
0114-flatten-binary-tree-to-linked-list
0117-populating-next-right-pointers-in-each-node-ii
0124-binary-tree-maximum-path-sum
0129-sum-root-to-leaf-numbers
0144-binary-tree-preorder-traversal
0145-binary-tree-postorder-traversal
0173-binary-search-tree-iterator
0199-binary-tree-right-side-view
0222-count-complete-tree-nodes
0226-invert-binary-tree
0230-kth-smallest-element-in-a-bst
0235-lowest-common-ancestor-of-a-binary-search-tree
0236-lowest-common-ancestor-of-a-binary-tree
0297-serialize-and-deserialize-binary-tree
0437-path-sum-iii
0450-delete-node-in-a-bst
0530-minimum-absolute-difference-in-bst
0543-diameter-of-binary-tree
0637-average-of-levels-in-binary-tree
0783-search-in-a-binary-search-tree
0904-leaf-similar-trees
1116-maximum-level-sum-of-a-binary-tree
1474-longest-zigzag-path-in-a-binary-tree
1544-count-good-nodes-in-binary-tree

Binary Search Tree


0098-validate-binary-search-tree
0108-convert-sorted-array-to-binary-search-tree
0173-binary-search-tree-iterator
0230-kth-smallest-element-in-a-bst
0235-lowest-common-ancestor-of-a-binary-search-tree
0450-delete-node-in-a-bst
0530-minimum-absolute-difference-in-bst
0783-search-in-a-binary-search-tree

Iterator


0173-binary-search-tree-iterator

Bit Manipulation


0029-divide-two-integers
0067-add-binary
0078-subsets
0136-single-number
0137-single-number-ii
0190-reverse-bits
0191-number-of-1-bits
0201-bitwise-and-of-numbers-range
0222-count-complete-tree-nodes
0287-find-the-duplicate-number
0338-counting-bits
1441-minimum-flips-to-make-a-or-b-equal-to-c
3820-number-of-unique-xor-triplets-ii
3824-number-of-unique-xor-triplets-i

Graph


0133-clone-graph
0207-course-schedule
0210-course-schedule-ii
0310-minimum-height-trees
0399-evaluate-division
0547-number-of-provinces
0871-keys-and-rooms
1576-reorder-routes-to-make-all-paths-lead-to-the-city-zero

Shortest Path


0399-evaluate-division

Topological Sort


0207-course-schedule
0210-course-schedule-ii
0310-minimum-height-trees

Backtracking


0017-letter-combinations-of-a-phone-number
0022-generate-parentheses
0037-sudoku-solver
0039-combination-sum
0040-combination-sum-ii
0046-permutations
0051-n-queens
0052-n-queens-ii
0077-combinations
0078-subsets
0079-word-search
0131-palindrome-partitioning
0212-word-search-ii
0216-combination-sum-iii

Merge Sort


0023-merge-k-sorted-lists
0148-sort-list

Heap (Priority Queue)


0023-merge-k-sorted-lists
0215-kth-largest-element-in-an-array
0239-sliding-window-maximum
0295-find-median-from-data-stream
0347-top-k-frequent-elements
0373-find-k-pairs-with-smallest-sums
0502-ipo
0621-task-scheduler
1014-k-closest-points-to-origin
1397-search-suggestions-system
1438-longest-continuous-subarray-with-absolute-diff-less-than-or-equal-to-limit
2413-smallest-number-in-infinite-set
2553-total-cost-to-hire-k-workers
2636-maximum-subsequence-score

Queue


0232-implement-queue-using-stacks
0239-sliding-window-maximum
0387-first-unique-character-in-a-string
0649-dota2-senate
0954-maximum-sum-circular-subarray
0969-number-of-recent-calls
1438-longest-continuous-subarray-with-absolute-diff-less-than-or-equal-to-limit

Monotonic Queue


0239-sliding-window-maximum
0954-maximum-sum-circular-subarray
1438-longest-continuous-subarray-with-absolute-diff-less-than-or-equal-to-limit

Quickselect


0215-kth-largest-element-in-an-array
0347-top-k-frequent-elements
1014-k-closest-points-to-origin

Data Stream


0295-find-median-from-data-stream
0937-online-stock-span
0969-number-of-recent-calls

Geometry


0149-max-points-on-a-line
1014-k-closest-points-to-origin

Memoization


0070-climbing-stairs
0139-word-break
1236-n-th-tribonacci-number

Combinatorics


0062-unique-paths

Database


0175-combine-two-tables
0181-employees-earning-more-than-their-managers
0584-find-customer-referee
1908-recyclable-and-low-fat-products

Bucket Sort


0347-top-k-frequent-elements

Enumeration


3820-number-of-unique-xor-triplets-ii

Binary Indexed Tree


0307-range-sum-query-mutable

Segment Tree


0307-range-sum-query-mutable

Ordered Set


1438-longest-continuous-subarray-with-absolute-diff-less-than-or-equal-to-limit
2413-smallest-number-in-infinite-set

Concurrency


1187-print-foobar-alternately
1216-print-zero-even-odd

Interactive


0278-first-bad-version
0374-guess-number-higher-or-lower

RashadTanjim/LeetCode-Multiverse

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LeetCode-Multiverse

LeetCode Topics

Array

Dynamic Programming

Greedy

Hash Table

Divide and Conquer

Sorting

Counting

Math

Two Pointers

Counting Sort

Design

Randomized

Prefix Sum

Stack

Monotonic Stack

String

Trie

String Matching

Simulation

Binary Search

Sliding Window

Matrix

Union Find

Recursion

Linked List

Doubly-Linked List

Tree

Depth-First Search

Breadth-First Search

Binary Tree

Binary Search Tree

Iterator

Bit Manipulation

Graph

Shortest Path

Topological Sort

Backtracking

Merge Sort

Heap (Priority Queue)

Queue

Monotonic Queue

Quickselect

Data Stream

Geometry

Memoization

Combinatorics

Database

Bucket Sort

Enumeration

Binary Indexed Tree

Segment Tree

Ordered Set

Concurrency

Interactive

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