List of problems¶
- 0001-two-sum
- 0002-add-two-numbers
- 0003-longest-substring-without-repeating-characters
- 0005-longest-palindromic-substring
- 0006-zigzag-conversion
- 0011-container-with-most-water
- 0012-integer-to-roman
- 0013-roman-to-integer
- 0014-longest-common-prefix
- 0015-3sum
- 0019-remove-nth-node-from-end-of-list
- 0020-valid-parentheses
- 0021-merge-two-sorted-lists
- 0025-reverse-nodes-in-k-group
- 0026-remove-duplicates-from-sorted-array
- 0027-remove-element
- 0028-find-the-index-of-the-first-occurrence-in-a-string
- 0030-substring-with-concatenation-of-all-words
- 0033-search-in-rotated-sorted-array
- 0036-valid-sudoku
- 0042-trapping-rain-water
- 0045-jump-game-ii
- 0048-rotate-image
- 0049-group-anagrams
- 0053-maximum-subarray
- 0054-spiral-matrix
- 0055-jump-game
- 0056-merge-intervals
- 0057-insert-interval
- 0058-length-of-last-word
- 0061-rotate-list
- 0068-text-justification
- 0071-simplify-path
- 0073-set-matrix-zeroes
- 0076-minimum-window-substring
- 0080-remove-duplicates-from-sorted-array-ii
- 0082-remove-duplicates-from-sorted-list-ii
- 0084-largest-rectangle-in-histogram
- 0088-merge-sorted-array
- 0092-reverse-linked-list-ii
- 0100-same-tree
- 0101-symmetric-tree
- 0104-maximum-depth-of-binary-tree
- 0121-best-time-to-buy-and-sell-stock
- 0122-best-time-to-buy-and-sell-stock-ii
- 0125-valid-palindrome
- 0128-longest-consecutive-sequence
- 0134-gas-station
- 0135-candy
- 0138-copy-list-with-random-pointer
- 0141-linked-list-cycle
- 0146-lru-cache
- 0147-insertion-sort-list
- 0150-evaluate-reverse-polish-notation
- 0151-reverse-words-in-a-string
- 0155-min-stack
- 0167-two-sum-ii-input-array-is-sorted
- 0169-majority-element
- 0186-reverse-words-in-a-string-ii
- 0189-rotate-array
- 0190-reverse-bits
- 0202-happy-number
- 0205-isomorphic-strings
- 0206-reverse-linked-list
- 0207-course-schedule
- 0209-minimum-size-subarray-sum
- 0212-word-search-ii
- 0215-kth-largest-element-in-an-array
- 0219-contains-duplicate-ii
- 0224-basic-calculator
- 0226-invert-binary-tree
- 0228-summary-ranges
- 0238-product-of-array-except-self
- 0242-valid-anagram
- 0252-meeting-rooms
- 0253-meeting-rooms-ii
- 0261-graph-valid-tree
- 0269-alien-dictionary
- 0271-encode-and-decode-strings
- 0274-h-index
- 0289-game-of-life
- 0290-word-pattern
- 0323-number-of-connected-components-in-an-undirected-graph
- 0371-sum-of-two-integers
- 0373-find-k-pairs-with-smallest-sums
- 0380-insert-delete-getrandom-o1
- 0383-ransom-note
- 0392-is-subsequence
- 0417-pacific-atlantic-water-flow
- 0424-longest-repeating-character-replacement
- 0452-minimum-number-of-arrows-to-burst-balloons
- 0459-repeated-substring-pattern
- 0460-lfu-cache
- 0482-license-key-formatting
- 0621-task-scheduler
- 0622-design-circular-queue
- 0633-sum-of-square-numbers
- 0636-exclusive-time-of-functions
- 0645-set-mismatch
- 0703-kth-largest-element-in-a-stream
- 0704-binary-search
- 0729-my-calendar-i
- 0739-daily-temperatures
- 0846-hand-of-straights
- 0852-peak-index-in-a-mountain-array
- 0862-shortest-subarray-with-sum-at-least-k
- 0907-sum-of-subarray-minimums
- 0912-sort-an-array
- 0932-beautiful-array
- 0991-broken-calculator
- 0kth-largest-element-in-an-array
- 0top-k-frequent-elements
- 1-two-sum
- 10-regular-expression-matching
- 100-same-tree
- 1009-complement-of-base-10-integer
- 101-symmetric-tree
- 1011-capacity-to-ship-packages-within-d-days
- 102-binary-tree-level-order-traversal
- 1022-sum-of-root-to-leaf-binary-numbers
- 104-maximum-depth-of-binary-tree
- 1041-robot-bounded-in-circle
- 1046-last-stone-weight
- 1047-remove-all-adjacent-duplicates-in-string
- 1048-longest-string-chain
- 105-construct-binary-tree-from-preorder-and-inorder-traversal
- 1074-number-of-submatrices-that-sum-to-target
- 108-convert-sorted-array-to-binary-search-tree
- 1091-shortest-path-in-binary-matrix
- 1094-car-pooling
- 11-container-with-most-water
- 1115-print-foobar-alternately
- 114-flatten-binary-tree-to-linked-list
- 116-populating-next-right-pointers-in-each-node
- 117-populating-next-right-pointers-in-each-node-ii
- 118-pascals-triangle
- 1192-critical-connections-in-a-network
- 1195-fizz-buzz-multithreaded
- 12-integer-to-roman
- 120-triangle
- 1200-minimum-absolute-difference
- 1202-smallest-string-with-swaps
- 1209-remove-all-adjacent-duplicates-in-string-ii
- 121-best-time-to-buy-and-sell-stock
- 1220-count-vowels-permutation
- 123-best-time-to-buy-and-sell-stock-iii
- 1233-remove-sub-folders-from-the-filesystem
- 124-binary-tree-maximum-path-sum
- 1268-search-suggestions-system
- 127-word-ladder
- 128-longest-consecutive-sequence
- 1291-sequential-digits
- 1296-divide-array-in-sets-of-k-consecutive-numbers
- 1302-deepest-leaves-sum
- 1305-all-elements-in-two-binary-search-trees
- 131-palindrome-partitioning
- 1310-xor-queries-of-a-subarray
- 132-palindrome-partitioning-ii
- 1332-remove-palindromic-subsequences
- 134-gas-station
- 1342-number-of-steps-to-reduce-a-number-to-zero
- 1345-jump-game-iv
- 135-candy
- 1354-construct-target-array-with-multiple-sums
- 1365-how-many-numbers-are-smaller-than-the-current-number
- 1379-find-a-corresponding-node-of-a-binary-tree-in-a-clone-of-that-tree
- 138-copy-list-with-random-pointer
- 1396-design-underground-system
- 140-word-break-ii
- 142-linked-list-cycle-ii
- 1423-maximum-points-you-can-obtain-from-cards
- 143-reorder-list
- 146-lru-cache
- 1461-check-if-a-string-contains-all-binary-codes-of-size-k
- 1463-cherry-pickup-ii
- 1465-maximum-area-of-a-piece-of-cake-after-horizontal-and-vertical-cuts
- 1472-design-browser-history
- 1475-final-prices-with-a-special-discount-in-a-shop
- 1480-running-sum-of-1d-array
- 1491-average-salary-excluding-the-minimum-and-maximum-salary
- 15-3sum
- 150-evaluate-reverse-polish-notation
- 1510-stone-game-iv
- 152-maximum-product-subarray
- 1523-count-odd-numbers-in-an-interval-range
- 155-min-stack
- 1584-min-cost-to-connect-all-points
- 1590-make-sum-divisible-by-p
- 1592-rearrange-spaces-between-words
- 1598-crawler-log-folder
- 160-intersection-of-two-linked-lists
- 1631-path-with-minimum-effort
- 1641-count-sorted-vowel-strings
- 1642-furthest-building-you-can-reach
- 1647-minimum-deletions-to-make-character-frequencies-unique
- 167-two-sum-ii-input-array-is-sorted
- 1672-richest-customer-wealth
- 1679-max-number-of-k-sum-pairs
- 1689-partitioning-into-minimum-number-of-deci-binary-numbers
- 1695-maximum-erasure-value
- 1696-jump-game-vi
- 17-letter-combinations-of-a-phone-number
- 1700-number-of-students-unable-to-eat-lunch
- 1710-maximum-units-on-a-truck
- 1711-count-good-meals
- 172-factorial-trailing-zeroes
- 1720-decode-xored-array
- 1721-swapping-nodes-in-a-linked-list
- 173-binary-search-tree-iterator
- 179-largest-number
- 18-4sum
- 1863-sum-of-all-subset-xor-totals
- 189-rotate-array
- 191-number-of-1-bits
- 1929-concatenation-of-array
- 199-binary-tree-right-side-view
- 2-add-two-numbers
- 20-valid-parentheses
- 2044-count-number-of-maximum-bitwise-or-subsets
- 206-reverse-linked-list
- 21-merge-two-sorted-lists
- 211-design-add-and-search-words-data-structure
- 212-word-search-ii
- 2138-divide-a-string-into-groups-of-size-k
- 215-kth-largest-element-in-an-array
- 216-combination-sum-iii
- 224-basic-calculator
- 225-implement-stack-using-queues
- 226-invert-binary-tree
- 2279-maximum-bags-with-full-capacity-of-rocks
- 23-merge-k-sorted-lists
- 230-kth-smallest-element-in-a-bst
- 232-implement-queue-using-stacks
- 234-palindrome-linked-list
- 235-lowest-common-ancestor-of-a-binary-search-tree
- 236-lowest-common-ancestor-of-a-binary-tree
- 2365-task-scheduler-ii
- 2385-amount-of-time-for-binary-tree-to-be-infected
- 239-sliding-window-maximum
- 240-search-a-2d-matrix-ii
- 2405-optimal-partition-of-string
- 242-valid-anagram
- 2571-minimum-operations-to-reduce-an-integer-to-0
- 258-add-digits
- 26-remove-duplicates-from-sorted-array
- 268-missing-number
- 284-peeking-iterator
- 287-find-the-duplicate-number
- 289-game-of-life
- 29-divide-two-integers
- 290-word-pattern
- 295-find-median-from-data-stream
- 2965-find-missing-and-repeated-values
- 297-serialize-and-deserialize-binary-tree
- 3-longest-substring-without-repeating-characters
- 300-longest-increasing-subsequence
- 303-range-sum-query-immutable
- 304-range-sum-query-2d-immutable
- 307-range-sum-query-mutable
- 3071-minimum-operations-to-write-the-letter-y-on-a-grid
- 31-next-permutation
- 315-count-of-smaller-numbers-after-self
- 3174-3292-414-third-maximum-number
- 318-maximum-product-of-word-lengths
- 32-longest-valid-parentheses
- 322-coin-change
- 3229-minimum-operations-to-make-array-equal-to-target
- 329-longest-increasing-path-in-a-matrix
- 338-counting-bits
- 34-find-first-and-last-position-of-element-in-sorted-array
- 341-flatten-nested-list-iterator
- 344-reverse-string
- 347-top-k-frequent-elements
- 3487-maximum-unique-subarray-sum-after-deletion
- 354-russian-doll-envelopes
- 355-design-twitter
- 3662-filter-characters-by-frequency
- 376-wiggle-subsequence
- 382-linked-list-random-node
- 388-longest-absolute-file-path
- 389-find-the-difference
- 39-combination-sum
- 399-evaluate-division
- 4-median-of-two-sorted-arrays
- 406-queue-reconstruction-by-height
- 41-first-missing-positive
- 410-split-array-largest-sum
- 412-fizz-buzz
- 416-partition-equal-subset-sum
- 421-maximum-xor-of-two-numbers-in-an-array
- 429-n-ary-tree-level-order-traversal
- 438-find-all-anagrams-in-a-string
- 45-jump-game-ii
- 452-minimum-number-of-arrows-to-burst-balloons
- 454-4sum-ii
- 456-132-pattern
- 46-permutations
- 460-lfu-cache
- 462-minimum-moves-to-equal-array-elements-ii
- 463-island-perimeter
- 47-permutations-ii
- 473-matchsticks-to-square
- 474-ones-and-zeroes
- 494-target-sum
- 4sum-ii
- 5-longest-palindromic-substring
- 509-fibonacci-number
- 51-n-queens
- 52-n-queens-ii
- 520-detect-capital
- 525-contiguous-array
- 53-maximum-subarray
- 532-k-diff-pairs-in-an-array
- 535-encode-and-decode-tinyurl
- 538-convert-bst-to-greater-tree
- 543-diameter-of-binary-tree
- 560-subarray-sum-equals-k
- 567-permutation-in-string
- 575-distribute-candies
- 576-out-of-boundary-paths
- 581-shortest-unsorted-continuous-subarray
- 583-delete-operation-for-two-strings
- 59-spiral-matrix-ii
- 60-permutation-sequence
- 60133-2155-1-two-sum
- 605-can-place-flowers
- 63-unique-paths-ii
- 630-course-schedule-iii
- 64-minimum-path-sum
- 647-palindromic-substrings
- 653-two-sum-iv-input-is-a-bst
- 658-find-k-closest-elements
- 661-image-smoother
- 665-non-decreasing-array
- 668-kth-smallest-number-in-multiplication-table
- 669-trim-a-binary-search-tree
- 67-add-binary
- 68-text-justification
- 680-valid-palindrome-ii
- 682-baseball-game
- 69-sqrtx
- 692-top-k-frequent-words
- 695-max-area-of-island
- 697-degree-of-an-array
- 7-reverse-integer
- 700-search-in-a-binary-search-tree
- 701-insert-into-a-binary-search-tree
- 703-kth-largest-element-in-a-stream
- 705-design-hashset
- 706-design-hashmap
- 707-design-linked-list
- 719-find-k-th-smallest-pair-distance
- 720-longest-word-in-dictionary
- 733-flood-fill
- 743-network-delay-time
- 745-prefix-and-suffix-search
- 746-min-cost-climbing-stairs
- 78-subsets
- 785-is-graph-bipartite
- 792-number-of-matching-subsequences
- 8-string-to-integer-atoi
- 80-remove-duplicates-from-sorted-array-ii
- 820-short-encoding-of-words
- 823-binary-trees-with-factors
- 84-largest-rectangle-in-histogram
- 844-backspace-string-compare
- 849-maximize-distance-to-closest-person
- 86-partition-list
- 863-all-nodes-distance-k-in-binary-tree
- 867-transpose-matrix
- 875-koko-eating-bananas
- 88-merge-sorted-array
- 890-find-and-replace-pattern
- 897-increasing-order-search-tree
- 9-palindrome-number
- 905-sort-array-by-parity
- 907-sum-of-subarray-minimums
- 91-decode-ways
- 916-word-subsets
- 92-reverse-linked-list-ii
- 923-3sum-with-multiplicity
- 93-restore-ip-addresses
- 941-valid-mountain-array
- 95-unique-binary-search-trees-ii
- 968-binary-tree-cameras
- 97-interleaving-string
- 979-distribute-coins-in-binary-tree
- 98-validate-binary-search-tree
- 981-time-based-key-value-store
- 99-recover-binary-search-tree
- 992-subarrays-with-k-different-integers
- 994-rotting-oranges
- basic-calculator-ii
- burst-balloons
- consecutive-characters
- course-schedule-ii
- decode-string
- distinct-subsequences
- fibonacci-number
- find-all-numbers-disappeared-in-an-array
- find-the-town-judge
- height-checker
- insertion-sort-list
- k-closest-points-to-origin
- maximal-square
- maximum-depth-of-n-ary-tree
- maximum-difference-between-node-and-ancestor
- maximum-gap
- merge-intervals
- middle-of-the-linked-list
- minimum-absolute-difference
- minimum-height-trees
- nth-magical-number
- number-complement
- numbers-at-most-n-given-digit-set
- pairs-of-songs-with-total-durations-divisible-by-60
- partition-equal-subset-sum
- partition-to-k-equal-sum-subsets
- path-sum
- path-sum-ii
- path-sum-iii
- perfect-squares
- populating-next-right-pointers-in-each-node
- power-of-two
- query-kth-smallest-trimmed-number
- range-sum-of-bst
- reorder-list
- reverse-linked-list
- reverse-words-in-a-string
- serialize-and-deserialize-binary-tree
- smallest-integer-divisible-by-k
- sort-an-array
- sort-colors
- squares-of-a-sorted-array
- third-maximum-number
- two-sum
- unique-email-addresses
- zigzag-conversion