Leetcode-submissions

LeetCode Topics

Two Pointers

0005-longest-palindromic-substring
0011-container-with-most-water
0042-trapping-rain-water
0075-sort-colors
0088-merge-sorted-array
0143-reorder-list
0151-reverse-words-in-a-string
0283-move-zeroes
0295-find-median-from-data-stream
0345-reverse-vowels-of-a-string
0392-is-subsequence
0455-assign-cookies
0567-permutation-in-string
0633-sum-of-square-numbers
0653-two-sum-iv-input-is-a-bst
0658-find-k-closest-elements
0768-partition-labels
0853-most-profit-assigning-work
0958-sort-array-by-parity-ii
1019-squares-of-a-sorted-array
1129-longest-string-chain
1468-check-if-n-and-its-double-exist
1566-check-if-a-word-occurs-as-a-prefix-of-any-word-in-a-sentence
1621-number-of-subsequences-that-satisfy-the-given-sum-condition
2232-adding-spaces-to-a-string
2265-partition-array-according-to-given-pivot
2320-find-all-k-distant-indices-in-an-array
2414-move-pieces-to-obtain-a-string
2481-strictly-palindromic-number
2497-maximum-matching-of-players-with-trainers
2551-apply-operations-to-an-array
2581-divide-players-into-teams-of-equal-skill
2699-count-the-number-of-fair-pairs
2707-merge-two-2d-arrays-by-summing-values
2816-lexicographically-smallest-palindrome
3081-minimum-array-length-after-pair-removals
3195-separate-black-and-white-balls
3487-find-maximum-removals-from-source-string

String

0003-longest-substring-without-repeating-characters
0005-longest-palindromic-substring
0006-zigzag-conversion
0013-roman-to-integer
0017-letter-combinations-of-a-phone-number
0020-valid-parentheses
0032-longest-valid-parentheses
0044-wildcard-matching
0049-group-anagrams
0058-length-of-last-word
0072-edit-distance
0076-minimum-window-substring
0079-word-search
0115-distinct-subsequences
0126-word-ladder-ii
0127-word-ladder
0132-palindrome-partitioning-ii
0151-reverse-words-in-a-string
0205-isomorphic-strings
0214-shortest-palindrome
0242-valid-anagram
0257-binary-tree-paths
0297-serialize-and-deserialize-binary-tree
0345-reverse-vowels-of-a-string
0383-ransom-note
0389-find-the-difference
0392-is-subsequence
0402-remove-k-digits
0412-fizz-buzz
0424-longest-repeating-character-replacement
0516-longest-palindromic-subsequence
0537-complex-number-multiplication
0567-permutation-in-string
0583-delete-operation-for-two-strings
0678-valid-parenthesis-string
0692-top-k-frequent-words
0721-accounts-merge
0768-partition-labels
0812-rotate-string
0851-goat-latin
0920-uncommon-words-from-two-sentences
0952-word-subsets
0957-minimum-add-to-make-parentheses-valid
1044-find-common-characters
1129-longest-string-chain
1170-shortest-common-supersequence
1250-longest-common-subsequence
1302-delete-characters-to-make-fancy-string
1350-remove-sub-folders-from-the-filesystem
1423-maximum-number-of-occurrences-of-a-substring
1437-minimum-insertion-steps-to-make-a-string-palindrome
1460-number-of-substrings-containing-all-three-characters
1502-construct-k-palindrome-strings
1508-longest-happy-prefix
1520-number-of-steps-to-reduce-a-number-in-binary-representation-to-one
1524-string-matching-in-an-array
1537-maximum-score-after-splitting-a-string
1543-simplified-fractions
1547-destination-city
1561-rearrange-words-in-a-sentence
1566-check-if-a-word-occurs-as-a-prefix-of-any-word-in-a-sentence
1737-maximum-nesting-depth-of-the-parentheses
1764-maximum-repeating-substring
1786-count-the-number-of-consistent-strings
1818-maximum-score-from-removing-substrings
1895-minimum-number-of-operations-to-move-all-balls-to-each-box
1915-check-if-one-string-swap-can-make-strings-equal
2021-remove-all-occurrences-of-a-substring
2059-unique-length-3-palindromic-subsequences
2113-find-the-kth-largest-integer-in-the-array
2220-find-all-possible-recipes-from-given-supplies
2232-adding-spaces-to-a-string
2237-longest-palindrome-by-concatenating-two-letter-words
2260-divide-a-string-into-groups-of-size-k
2292-counting-words-with-a-given-prefix
2293-minimum-number-of-steps-to-make-two-strings-anagram-ii
2346-largest-3-same-digit-number-in-string
2395-longest-binary-subsequence-less-than-or-equal-to-k
2414-move-pieces-to-obtain-a-string
2463-minimum-recolors-to-get-k-consecutive-black-blocks
2492-length-of-the-longest-alphabetical-continuous-substring
2580-circular-sentence
2691-count-vowel-strings-in-ranges
2800-minimum-string-length-after-removing-substrings
2816-lexicographically-smallest-palindrome
3143-longest-unequal-adjacent-groups-subsequence-i
3150-shortest-and-lexicographically-smallest-beautiful-string
3174-minimum-number-of-changes-to-make-binary-string-beautiful
3194-find-words-containing-character
3195-separate-black-and-white-balls
3267-find-longest-special-substring-that-occurs-thrice-i
3276-minimum-number-of-pushes-to-type-word-ii
3309-count-prefix-and-suffix-pairs-i
3360-minimum-deletions-to-make-string-k-special
3396-valid-word
3445-lexicographically-minimum-string-after-removing-stars
3447-clear-digits
3455-minimum-length-of-string-after-operations
3484-lexicographically-smallest-string-after-a-swap
3487-find-maximum-removals-from-source-string
3566-find-the-sequence-of-strings-appeared-on-the-screen
3567-convert-date-to-binary
3569-count-of-substrings-containing-every-vowel-and-k-consonants-ii
3570-count-of-substrings-containing-every-vowel-and-k-consonants-i
3617-find-the-original-typed-string-i
3634-find-mirror-score-of-a-string
3684-substring-matching-pattern
3753-maximum-difference-between-even-and-odd-frequency-i
3754-maximum-manhattan-distance-after-k-changes
3872-find-most-frequent-vowel-and-consonant

Greedy

0011-container-with-most-water
0044-wildcard-matching
0045-jump-game-ii
0055-jump-game
0122-best-time-to-buy-and-sell-stock-ii
0402-remove-k-digits
0410-split-array-largest-sum
0435-non-overlapping-intervals
0455-assign-cookies
0605-can-place-flowers
0624-maximum-distance-in-arrays
0670-maximum-swap
0678-valid-parenthesis-string
0714-best-time-to-buy-and-sell-stock-with-transaction-fee
0768-partition-labels
0797-rabbits-in-forest
0853-most-profit-assigning-work
0876-hand-of-straights
0890-lemonade-change
0957-minimum-add-to-make-parentheses-valid
1407-group-the-people-given-the-group-size-they-belong-to
1448-maximum-69-number
1478-maximum-number-of-events-that-can-be-attended
1502-construct-k-palindrome-strings
1529-max-difference-you-can-get-from-changing-an-integer
1818-maximum-score-from-removing-substrings
1917-maximum-average-pass-ratio
2188-minimized-maximum-of-products-distributed-to-any-store
2237-longest-palindrome-by-concatenating-two-letter-words
2248-minimum-cost-of-buying-candies-with-discount
2264-minimum-sum-of-four-digit-number-after-splitting-digits
2387-partition-array-such-that-maximum-difference-is-k
2395-longest-binary-subsequence-less-than-or-equal-to-k
2437-maximum-number-of-groups-entering-a-competition
2497-maximum-matching-of-players-with-trainers
2509-minimize-xor
2600-maximum-tastiness-of-candy-basket
2640-maximum-number-of-integers-to-choose-from-a-range-i
2704-maximum-difference-by-remapping-a-digit
2720-minimize-the-maximum-difference-of-pairs
2816-lexicographically-smallest-palindrome
3081-minimum-array-length-after-pair-removals
3143-longest-unequal-adjacent-groups-subsequence-i
3171-minimum-equal-sum-of-two-arrays-after-replacing-zeros
3195-separate-black-and-white-balls
3241-divide-array-into-arrays-with-max-difference
3264-maximum-points-after-enemy-battles
3276-minimum-number-of-pushes-to-type-word-ii
3360-minimum-deletions-to-make-string-k-special
3445-lexicographically-minimum-string-after-removing-stars
3484-lexicographically-smallest-string-after-a-swap
3741-reschedule-meetings-for-maximum-free-time-ii
3743-reschedule-meetings-for-maximum-free-time-i
3788-maximum-unique-subarray-sum-after-deletion
3868-find-maximum-area-of-a-triangle
3876-transform-array-to-all-equal-elements
3904-minimum-adjacent-swaps-to-alternate-parity

Array

0001-two-sum
0004-median-of-two-sorted-arrays
0011-container-with-most-water
0033-search-in-rotated-sorted-array
0034-find-first-and-last-position-of-element-in-sorted-array
0035-search-insert-position
0036-valid-sudoku
0039-combination-sum
0040-combination-sum-ii
0042-trapping-rain-water
0045-jump-game-ii
0049-group-anagrams
0051-n-queens
0053-maximum-subarray
0054-spiral-matrix
0055-jump-game
0056-merge-intervals
0057-insert-interval
0059-spiral-matrix-ii
0063-unique-paths-ii
0064-minimum-path-sum
0073-set-matrix-zeroes
0075-sort-colors
0078-subsets
0079-word-search
0081-search-in-rotated-sorted-array-ii
0084-largest-rectangle-in-histogram
0085-maximal-rectangle
0088-merge-sorted-array
0090-subsets-ii
0105-construct-binary-tree-from-preorder-and-inorder-traversal
0106-construct-binary-tree-from-inorder-and-postorder-traversal
0118-pascals-triangle
0119-pascals-triangle-ii
0120-triangle
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
0136-single-number
0137-single-number-ii
0152-maximum-product-subarray
0153-find-minimum-in-rotated-sorted-array
0169-majority-element
0188-best-time-to-buy-and-sell-stock-iv
0198-house-robber
0209-minimum-size-subarray-sum
0213-house-robber-ii
0215-kth-largest-element-in-an-array
0216-combination-sum-iii
0217-contains-duplicate
0229-majority-element-ii
0239-sliding-window-maximum
0260-single-number-iii
0283-move-zeroes
0300-longest-increasing-subsequence
0307-range-sum-query-mutable
0309-best-time-to-buy-and-sell-stock-with-cooldown
0312-burst-balloons
0315-count-of-smaller-numbers-after-self
0322-coin-change
0347-top-k-frequent-elements
0368-largest-divisible-subset
0410-split-array-largest-sum
0413-arithmetic-slices
0414-third-maximum-number
0416-partition-equal-subset-sum
0435-non-overlapping-intervals
0442-find-all-duplicates-in-an-array
0448-find-all-numbers-disappeared-in-an-array
0455-assign-cookies
0485-max-consecutive-ones
0494-target-sum
0496-next-greater-element-i
0498-diagonal-traverse
0503-next-greater-element-ii
0518-coin-change-ii
0542-01-matrix
0560-subarray-sum-equals-k
0575-distribute-candies
0594-longest-harmonious-subsequence
0605-can-place-flowers
0624-maximum-distance-in-arrays
0628-maximum-product-of-three-numbers
0658-find-k-closest-elements
0665-non-decreasing-array
0673-number-of-longest-increasing-subsequence
0713-subarray-product-less-than-k
0714-best-time-to-buy-and-sell-stock-with-transaction-fee
0721-accounts-merge
0724-find-pivot-index
0735-asteroid-collision
0747-min-cost-climbing-stairs
0794-swim-in-rising-water
0797-rabbits-in-forest
0853-most-profit-assigning-work
0854-making-a-large-island
0876-hand-of-straights
0882-peak-index-in-a-mountain-array
0890-lemonade-change
0905-length-of-longest-fibonacci-subsequence
0907-koko-eating-bananas
0934-bitwise-ors-of-subarrays
0940-fruit-into-baskets
0943-sum-of-subarray-minimums
0944-smallest-range-i
0945-snakes-and-ladders
0952-word-subsets
0954-maximum-sum-circular-subarray
0958-sort-array-by-parity-ii
0966-binary-subarrays-with-sum
0967-minimum-falling-path-sum
1014-k-closest-points-to-origin
1019-squares-of-a-sorted-array
1025-minimum-cost-for-tickets
1034-subarrays-with-k-different-integers
1036-rotting-oranges
1044-find-common-characters
1046-max-consecutive-ones-iii
1056-capacity-to-ship-packages-within-d-days
1073-number-of-enclaves
1121-partition-array-for-maximum-sum
1129-longest-string-chain
1171-shortest-path-in-binary-matrix
1256-rank-transform-of-an-array
1293-three-consecutive-odds
1335-maximum-candies-allocated-to-k-children
1350-remove-sub-folders-from-the-filesystem
1364-tuple-with-same-product
1370-count-number-of-nice-subarrays
1396-count-servers-that-communicate
1402-count-square-submatrices-with-all-ones
1407-group-the-people-given-the-group-size-they-belong-to
1408-find-the-smallest-divisor-given-a-threshold
1468-check-if-n-and-its-double-exist
1478-maximum-number-of-events-that-can-be-attended
1485-minimum-cost-to-make-at-least-one-valid-path-in-a-grid
1497-design-a-stack-with-increment-operation
1510-find-lucky-integer-in-an-array
1524-string-matching-in-an-array
1525-queries-on-a-permutation-with-key
1538-maximum-points-you-can-obtain-from-cards
1547-destination-city
1549-longest-continuous-subarray-with-absolute-diff-less-than-or-equal-to-limit
1570-final-prices-with-a-special-discount-in-a-shop
1572-subrectangle-queries
1586-longest-subarray-of-1s-after-deleting-one-element
1605-minimum-number-of-days-to-make-m-bouquets
1621-number-of-subsequences-that-satisfy-the-given-sum-condition
1628-count-submatrices-with-all-ones
1656-count-good-triplets
1669-minimum-cost-to-cut-a-stick
1675-magnetic-force-between-two-balls
1753-path-with-minimum-effort
1786-count-the-number-of-consistent-strings
1813-maximum-erasure-value
1851-maximum-number-of-events-that-can-be-attended-ii
1878-check-if-array-is-sorted-and-rotated
1886-minimum-limit-of-balls-in-a-bag
1895-minimum-number-of-operations-to-move-all-balls-to-each-box
1900-closest-dessert-cost
1917-maximum-average-pass-ratio
1927-maximum-ascending-subarray-sum
1939-queries-on-number-of-points-inside-a-circle
1940-maximum-xor-for-each-query
1946-minimum-absolute-sum-difference
1993-sum-of-all-subset-xor-totals
1995-finding-pairs-with-a-certain-sum
2113-find-the-kth-largest-integer-in-the-array
2116-count-number-of-pairs-with-absolute-difference-k
2144-maximum-difference-between-increasing-elements
2145-grid-game
2160-minimum-operations-to-make-a-uni-value-grid
2170-count-number-of-maximum-bitwise-or-subsets
2188-minimized-maximum-of-products-distributed-to-any-store
2204-find-subsequence-of-length-k-with-the-largest-sum
2210-find-target-indices-after-sorting-array
2215-finding-3-digit-even-numbers
2220-find-all-possible-recipes-from-given-supplies
2232-adding-spaces-to-a-string
2233-number-of-smooth-descent-periods-of-a-stock
2237-longest-palindrome-by-concatenating-two-letter-words
2248-minimum-cost-of-buying-candies-with-discount
2262-solving-questions-with-brainpower
2265-partition-array-according-to-given-pivot
2292-counting-words-with-a-given-prefix
2308-divide-array-into-equal-pairs
2316-count-hills-and-valleys-in-an-array
2320-find-all-k-distant-indices-in-an-array
2356-largest-combination-with-bitwise-and-greater-than-zero
2358-number-of-ways-to-split-array
2387-partition-array-such-that-maximum-difference-is-k
2432-number-of-zero-filled-subarrays
2437-maximum-number-of-groups-entering-a-competition
2448-count-number-of-bad-pairs
2473-max-sum-of-a-pair-with-equal-sum-of-digits
2478-longest-nice-subarray
2497-maximum-matching-of-players-with-trainers
2498-smallest-subarrays-with-maximum-bitwise-or
2503-longest-subarray-with-maximum-bitwise-and
2526-longest-increasing-subsequence-ii
2529-range-product-queries-of-powers
2533-bitwise-xor-of-all-pairings
2551-apply-operations-to-an-array
2581-divide-players-into-teams-of-equal-skill
2600-maximum-tastiness-of-candy-basket
2614-maximum-count-of-positive-integer-and-negative-integer
2621-find-xor-beauty-of-array
2631-sort-the-students-by-their-kth-score
2640-maximum-number-of-integers-to-choose-from-a-range-i
2665-minimum-time-to-repair-cars
2685-first-completely-painted-row-or-column
2690-house-robber-iv
2691-count-vowel-strings-in-ranges
2692-take-gifts-from-the-richest-pile
2695-find-score-of-an-array-after-marking-all-elements
2699-count-the-number-of-fair-pairs
2707-merge-two-2d-arrays-by-summing-values
2718-minimum-operations-to-make-all-array-elements-equal
2720-minimize-the-maximum-difference-of-pairs
2766-find-the-prefix-common-array-of-two-arrays
2792-neighboring-bitwise-xor
2888-minimum-index-of-a-valid-split
2891-maximum-beauty-of-an-array-after-applying-operation
3081-minimum-array-length-after-pair-removals
3143-longest-unequal-adjacent-groups-subsequence-i
3152-maximum-value-of-an-ordered-triplet-ii
3154-maximum-value-of-an-ordered-triplet-i
3171-minimum-equal-sum-of-two-arrays-after-replacing-zeros
3194-find-words-containing-character
3227-find-missing-and-repeated-values
3241-divide-array-into-arrays-with-max-difference
3251-maximum-area-of-longest-diagonal-rectangle
3264-maximum-points-after-enemy-battles
3278-find-the-number-of-ways-to-place-people-i
3309-count-prefix-and-suffix-pairs-i
3321-type-of-triangle
3372-longest-strictly-increasing-or-strictly-decreasing-subarray
3373-maximum-prime-difference
3404-minimum-number-of-operations-to-satisfy-conditions
3427-special-array-ii
3428-find-the-xor-of-numbers-which-appear-twice
3429-special-array-i
3430-count-days-without-meetings
3434-find-the-number-of-distinct-colors-among-the-balls
3461-find-the-minimum-area-to-cover-all-ones-i
3475-minimum-operations-to-make-binary-array-elements-equal-to-one-i
3483-alternating-groups-ii
3487-find-maximum-removals-from-source-string
3490-find-the-maximum-length-of-valid-subsequence-i
3491-find-the-maximum-length-of-valid-subsequence-ii
3555-final-array-state-after-k-multiplication-operations-i
3606-minimum-element-after-replacement-with-digit-sum
3621-minimum-operations-to-make-array-values-equal-to-k
3622-maximum-frequency-of-an-element-after-performing-operations-i
3632-button-with-longest-push-time
3639-zero-array-transformation-i
3643-zero-array-transformation-ii
3653-maximum-subarray-sum-with-length-divisible-by-k
3656-minimum-number-of-operations-to-make-elements-in-array-distinct
3657-check-if-grid-can-be-cut-into-sections
3704-count-partitions-with-even-sum-difference
3708-zigzag-grid-traversal-with-skip
3741-reschedule-meetings-for-maximum-free-time-ii
3743-reschedule-meetings-for-maximum-free-time-i
3747-maximum-difference-between-adjacent-elements-in-a-circular-array
3748-sort-matrix-by-diagonals
3750-closest-equal-element-queries
3788-maximum-unique-subarray-sum-after-deletion
3790-fruits-into-baskets-ii
3791-fruits-into-baskets-iii
3820-number-of-unique-xor-triplets-ii
3824-number-of-unique-xor-triplets-i
3837-grid-teleportation-traversal
3838-path-existence-queries-in-a-graph-i
3868-find-maximum-area-of-a-triangle
3876-transform-array-to-all-equal-elements
3892-best-time-to-buy-and-sell-stock-v
3904-minimum-adjacent-swaps-to-alternate-parity
3907-count-prime-gap-balanced-subarrays
3909-minimum-increments-to-equalize-leaf-paths
3914-check-if-any-element-has-prime-frequency

Hash Table

0001-two-sum
0003-longest-substring-without-repeating-characters
0013-roman-to-integer
0017-letter-combinations-of-a-phone-number
0036-valid-sudoku
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
0126-word-ladder-ii
0127-word-ladder
0128-longest-consecutive-sequence
0146-lru-cache
0169-majority-element
0205-isomorphic-strings
0217-contains-duplicate
0229-majority-element-ii
0242-valid-anagram
0347-top-k-frequent-elements
0355-design-twitter
0383-ransom-note
0389-find-the-difference
0424-longest-repeating-character-replacement
0442-find-all-duplicates-in-an-array
0448-find-all-numbers-disappeared-in-an-array
0496-next-greater-element-i
0560-subarray-sum-equals-k
0567-permutation-in-string
0575-distribute-candies
0594-longest-harmonious-subsequence
0653-two-sum-iv-input-is-a-bst
0692-top-k-frequent-words
0721-accounts-merge
0768-partition-labels
0797-rabbits-in-forest
0876-hand-of-straights
0893-all-nodes-distance-k-in-binary-tree
0900-reordered-power-of-2
0905-length-of-longest-fibonacci-subsequence
0920-uncommon-words-from-two-sentences
0940-fruit-into-baskets
0952-word-subsets
0966-binary-subarrays-with-sum
0984-most-stones-removed-with-same-row-or-column
1029-vertical-order-traversal-of-a-binary-tree
1034-subarrays-with-k-different-integers
1044-find-common-characters
1129-longest-string-chain
1218-lowest-common-ancestor-of-deepest-leaves
1256-rank-transform-of-an-array
1364-tuple-with-same-product
1370-count-number-of-nice-subarrays
1407-group-the-people-given-the-group-size-they-belong-to
1423-maximum-number-of-occurrences-of-a-substring
1460-number-of-substrings-containing-all-three-characters
1468-check-if-n-and-its-double-exist
1502-construct-k-palindrome-strings
1510-find-lucky-integer-in-an-array
1547-destination-city
1786-count-the-number-of-consistent-strings
1813-maximum-erasure-value
1915-check-if-one-string-swap-can-make-strings-equal
1995-finding-pairs-with-a-certain-sum
2059-unique-length-3-palindromic-subsequences
2116-count-number-of-pairs-with-absolute-difference-k
2204-find-subsequence-of-length-k-with-the-largest-sum
2215-finding-3-digit-even-numbers
2220-find-all-possible-recipes-from-given-supplies
2237-longest-palindrome-by-concatenating-two-letter-words
2293-minimum-number-of-steps-to-make-two-strings-anagram-ii
2308-divide-array-into-equal-pairs
2356-largest-combination-with-bitwise-and-greater-than-zero
2434-design-a-number-container-system
2448-count-number-of-bad-pairs
2461-amount-of-time-for-binary-tree-to-be-infected
2473-max-sum-of-a-pair-with-equal-sum-of-digits
2581-divide-players-into-teams-of-equal-skill
2640-maximum-number-of-integers-to-choose-from-a-range-i
2685-first-completely-painted-row-or-column
2695-find-score-of-an-array-after-marking-all-elements
2707-merge-two-2d-arrays-by-summing-values
2766-find-the-prefix-common-array-of-two-arrays
2888-minimum-index-of-a-valid-split
3081-minimum-array-length-after-pair-removals
3227-find-missing-and-repeated-values
3267-find-longest-special-substring-that-occurs-thrice-i
3276-minimum-number-of-pushes-to-type-word-ii
3360-minimum-deletions-to-make-string-k-special
3428-find-the-xor-of-numbers-which-appear-twice
3434-find-the-number-of-distinct-colors-among-the-balls
3445-lexicographically-minimum-string-after-removing-stars
3455-minimum-length-of-string-after-operations
3487-find-maximum-removals-from-source-string
3569-count-of-substrings-containing-every-vowel-and-k-consonants-ii
3570-count-of-substrings-containing-every-vowel-and-k-consonants-i
3621-minimum-operations-to-make-array-values-equal-to-k
3634-find-mirror-score-of-a-string
3653-maximum-subarray-sum-with-length-divisible-by-k
3656-minimum-number-of-operations-to-make-elements-in-array-distinct
3750-closest-equal-element-queries
3753-maximum-difference-between-even-and-odd-frequency-i
3754-maximum-manhattan-distance-after-k-changes
3788-maximum-unique-subarray-sum-after-deletion
3837-grid-teleportation-traversal
3838-path-existence-queries-in-a-graph-i
3868-find-maximum-area-of-a-triangle
3872-find-most-frequent-vowel-and-consonant
3914-check-if-any-element-has-prime-frequency

Math

0007-reverse-integer
0009-palindrome-number
0013-roman-to-integer
0050-powx-n
0062-unique-paths
0069-sqrtx
0070-climbing-stairs
0231-power-of-two
0326-power-of-three
0342-power-of-four
0368-largest-divisible-subset
0371-sum-of-two-integers
0412-fizz-buzz
0441-arranging-coins
0504-base-7
0507-perfect-number
0537-complex-number-multiplication
0628-maximum-product-of-three-numbers
0633-sum-of-square-numbers
0670-maximum-swap
0728-self-dividing-numbers
0797-rabbits-in-forest
0900-reordered-power-of-2
0944-smallest-range-i
1014-k-closest-points-to-origin
1370-count-number-of-nice-subarrays
1448-maximum-69-number
1529-max-difference-you-can-get-from-changing-an-integer
1543-simplified-fractions
1585-the-kth-factor-of-n
1610-xor-operation-in-an-array
1630-count-odd-numbers-in-an-interval-range
1889-check-if-number-is-a-sum-of-powers-of-three
1939-queries-on-number-of-points-inside-a-circle
1993-sum-of-all-subset-xor-totals
2050-count-good-numbers
2160-minimum-operations-to-make-a-uni-value-grid
2233-number-of-smooth-descent-periods-of-a-stock
2264-minimum-sum-of-four-digit-number-after-splitting-digits
2278-find-three-consecutive-integers-that-sum-to-a-given-number
2351-number-of-ways-to-buy-pens-and-pencils
2432-number-of-zero-filled-subarrays
2437-maximum-number-of-groups-entering-a-competition
2448-count-number-of-bad-pairs
2481-strictly-palindromic-number
2571-find-the-pivot-integer
2575-minimum-cuts-to-divide-a-circle
2610-closest-prime-numbers-in-range
2621-find-xor-beauty-of-array
2649-count-total-number-of-colored-cells
2704-maximum-difference-by-remapping-a-digit
2752-sum-multiples
2812-find-the-maximum-achievable-number
2998-count-symmetric-integers
3172-divisible-and-non-divisible-sums-difference
3201-distribute-candies-among-children-ii
3227-find-missing-and-repeated-values
3278-find-the-number-of-ways-to-place-people-i
3279-alice-and-bob-playing-flower-game
3321-type-of-triangle
3373-maximum-prime-difference
3555-final-array-state-after-k-multiplication-operations-i
3567-convert-date-to-binary
3600-find-the-k-th-character-in-string-game-i
3606-minimum-element-after-replacement-with-digit-sum
3704-count-partitions-with-even-sum-difference
3754-maximum-manhattan-distance-after-k-changes
3820-number-of-unique-xor-triplets-ii
3824-number-of-unique-xor-triplets-i
3859-maximum-product-of-two-digits
3868-find-maximum-area-of-a-triangle
3907-count-prime-gap-balanced-subarrays
3914-check-if-any-element-has-prime-frequency

Brainteaser

2481-strictly-palindromic-number
2503-longest-subarray-with-maximum-bitwise-and
2533-bitwise-xor-of-all-pairings

Tree

0094-binary-tree-inorder-traversal
0098-validate-binary-search-tree
0099-recover-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
0110-balanced-binary-tree
0111-minimum-depth-of-binary-tree
0114-flatten-binary-tree-to-linked-list
0124-binary-tree-maximum-path-sum
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
0257-binary-tree-paths
0297-serialize-and-deserialize-binary-tree
0450-delete-node-in-a-bst
0543-diameter-of-binary-tree
0637-average-of-levels-in-binary-tree
0653-two-sum-iv-input-is-a-bst
0662-maximum-width-of-binary-tree
0783-search-in-a-binary-search-tree
0784-insert-into-a-binary-search-tree
0789-kth-largest-element-in-a-stream
0893-all-nodes-distance-k-in-binary-tree
1029-vertical-order-traversal-of-a-binary-tree
1218-lowest-common-ancestor-of-deepest-leaves
1498-find-a-corresponding-node-of-a-binary-tree-in-a-clone-of-that-tree
2384-root-equals-sum-of-children
2461-amount-of-time-for-binary-tree-to-be-infected
3633-maximize-the-number-of-target-nodes-after-connecting-trees-i
3909-minimum-increments-to-equalize-leaf-paths

Design

0146-lru-cache
0173-binary-search-tree-iterator
0295-find-median-from-data-stream
0297-serialize-and-deserialize-binary-tree
0307-range-sum-query-mutable
0355-design-twitter
0789-kth-largest-element-in-a-stream
0937-online-stock-span
1497-design-a-stack-with-increment-operation
1572-subrectangle-queries
1995-finding-pairs-with-a-certain-sum
2434-design-a-number-container-system

Binary Search Tree

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
0081-search-in-rotated-sorted-array-ii
0098-validate-binary-search-tree
0099-recover-binary-search-tree
0153-find-minimum-in-rotated-sorted-array
0173-binary-search-tree-iterator
0209-minimum-size-subarray-sum
0222-count-complete-tree-nodes
0230-kth-smallest-element-in-a-bst
0235-lowest-common-ancestor-of-a-binary-search-tree
0300-longest-increasing-subsequence
0315-count-of-smaller-numbers-after-self
0410-split-array-largest-sum
0441-arranging-coins
0450-delete-node-in-a-bst
0633-sum-of-square-numbers
0653-two-sum-iv-input-is-a-bst
0658-find-k-closest-elements
0713-subarray-product-less-than-k
0783-search-in-a-binary-search-tree
0784-insert-into-a-binary-search-tree
0789-kth-largest-element-in-a-stream
0794-swim-in-rising-water
0853-most-profit-assigning-work
0882-peak-index-in-a-mountain-array
0907-koko-eating-bananas
1046-max-consecutive-ones-iii
1056-capacity-to-ship-packages-within-d-days
1335-maximum-candies-allocated-to-k-children
1408-find-the-smallest-divisor-given-a-threshold
1468-check-if-n-and-its-double-exist
1605-minimum-number-of-days-to-make-m-bouquets
1621-number-of-subsequences-that-satisfy-the-given-sum-condition
1675-magnetic-force-between-two-balls
1753-path-with-minimum-effort
1851-maximum-number-of-events-that-can-be-attended-ii
1886-minimum-limit-of-balls-in-a-bag
1946-minimum-absolute-sum-difference
2188-minimized-maximum-of-products-distributed-to-any-store
2210-find-target-indices-after-sorting-array
2437-maximum-number-of-groups-entering-a-competition
2498-smallest-subarrays-with-maximum-bitwise-or
2600-maximum-tastiness-of-candy-basket
2614-maximum-count-of-positive-integer-and-negative-integer
2640-maximum-number-of-integers-to-choose-from-a-range-i
2665-minimum-time-to-repair-cars
2690-house-robber-iv
2699-count-the-number-of-fair-pairs
2718-minimum-operations-to-make-all-array-elements-equal
2720-minimize-the-maximum-difference-of-pairs
2891-maximum-beauty-of-an-array-after-applying-operation
3081-minimum-array-length-after-pair-removals
3267-find-longest-special-substring-that-occurs-thrice-i
3427-special-array-ii
3622-maximum-frequency-of-an-element-after-performing-operations-i
3643-zero-array-transformation-ii
3750-closest-equal-element-queries
3790-fruits-into-baskets-ii
3791-fruits-into-baskets-iii
3838-path-existence-queries-in-a-graph-i

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
0355-design-twitter
0658-find-k-closest-elements
0692-top-k-frequent-words
0744-network-delay-time
0789-kth-largest-element-in-a-stream
0794-swim-in-rising-water
0803-cheapest-flights-within-k-stops
1014-k-closest-points-to-origin
1478-maximum-number-of-events-that-can-be-attended
1485-minimum-cost-to-make-at-least-one-valid-path-in-a-grid
1549-longest-continuous-subarray-with-absolute-diff-less-than-or-equal-to-limit
1753-path-with-minimum-effort
1917-maximum-average-pass-ratio
2113-find-the-kth-largest-integer-in-the-array
2204-find-subsequence-of-length-k-with-the-largest-sum
2434-design-a-number-container-system
2473-max-sum-of-a-pair-with-equal-sum-of-digits
2692-take-gifts-from-the-richest-pile
2695-find-score-of-an-array-after-marking-all-elements
3445-lexicographically-minimum-string-after-removing-stars
3555-final-array-state-after-k-multiplication-operations-i

Binary Tree

0094-binary-tree-inorder-traversal
0098-validate-binary-search-tree
0099-recover-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
0110-balanced-binary-tree
0111-minimum-depth-of-binary-tree
0114-flatten-binary-tree-to-linked-list
0124-binary-tree-maximum-path-sum
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
0257-binary-tree-paths
0297-serialize-and-deserialize-binary-tree
0450-delete-node-in-a-bst
0543-diameter-of-binary-tree
0637-average-of-levels-in-binary-tree
0653-two-sum-iv-input-is-a-bst
0662-maximum-width-of-binary-tree
0783-search-in-a-binary-search-tree
0784-insert-into-a-binary-search-tree
0789-kth-largest-element-in-a-stream
0893-all-nodes-distance-k-in-binary-tree
1029-vertical-order-traversal-of-a-binary-tree
1218-lowest-common-ancestor-of-deepest-leaves
1498-find-a-corresponding-node-of-a-binary-tree-in-a-clone-of-that-tree
2384-root-equals-sum-of-children
2461-amount-of-time-for-binary-tree-to-be-infected

Data Stream

0295-find-median-from-data-stream
0789-kth-largest-element-in-a-stream
0937-online-stock-span

Number Theory

1543-simplified-fractions
1585-the-kth-factor-of-n
2610-closest-prime-numbers-in-range
3373-maximum-prime-difference
3907-count-prime-gap-balanced-subarrays
3914-check-if-any-element-has-prime-frequency

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
0169-majority-element
0215-kth-largest-element-in-an-array
0315-count-of-smaller-numbers-after-self
0347-top-k-frequent-elements
0954-maximum-sum-circular-subarray
1014-k-closest-points-to-origin
2113-find-the-kth-largest-integer-in-the-array
2526-longest-increasing-subsequence-ii

Geometry

1014-k-closest-points-to-origin
1939-queries-on-number-of-points-inside-a-circle
2575-minimum-cuts-to-divide-a-circle
3278-find-the-number-of-ways-to-place-people-i
3868-find-maximum-area-of-a-triangle

Sorting

0049-group-anagrams
0056-merge-intervals
0075-sort-colors
0088-merge-sorted-array
0169-majority-element
0215-kth-largest-element-in-an-array
0217-contains-duplicate
0229-majority-element-ii
0242-valid-anagram
0295-find-median-from-data-stream
0347-top-k-frequent-elements
0368-largest-divisible-subset
0389-find-the-difference
0414-third-maximum-number
0435-non-overlapping-intervals
0455-assign-cookies
0594-longest-harmonious-subsequence
0628-maximum-product-of-three-numbers
0658-find-k-closest-elements
0692-top-k-frequent-words
0721-accounts-merge
0853-most-profit-assigning-work
0876-hand-of-straights
0900-reordered-power-of-2
0958-sort-array-by-parity-ii
1014-k-closest-points-to-origin
1019-squares-of-a-sorted-array
1029-vertical-order-traversal-of-a-binary-tree
1129-longest-string-chain
1256-rank-transform-of-an-array
1468-check-if-n-and-its-double-exist
1478-maximum-number-of-events-that-can-be-attended
1561-rearrange-words-in-a-sentence
1621-number-of-subsequences-that-satisfy-the-given-sum-condition
1669-minimum-cost-to-cut-a-stick
1675-magnetic-force-between-two-balls
1851-maximum-number-of-events-that-can-be-attended-ii
1946-minimum-absolute-sum-difference
2113-find-the-kth-largest-integer-in-the-array
2160-minimum-operations-to-make-a-uni-value-grid
2204-find-subsequence-of-length-k-with-the-largest-sum
2210-find-target-indices-after-sorting-array
2215-finding-3-digit-even-numbers
2248-minimum-cost-of-buying-candies-with-discount
2264-minimum-sum-of-four-digit-number-after-splitting-digits
2387-partition-array-such-that-maximum-difference-is-k
2473-max-sum-of-a-pair-with-equal-sum-of-digits
2497-maximum-matching-of-players-with-trainers
2581-divide-players-into-teams-of-equal-skill
2600-maximum-tastiness-of-candy-basket
2631-sort-the-students-by-their-kth-score
2640-maximum-number-of-integers-to-choose-from-a-range-i
2695-find-score-of-an-array-after-marking-all-elements
2699-count-the-number-of-fair-pairs
2718-minimum-operations-to-make-all-array-elements-equal
2888-minimum-index-of-a-valid-split
2891-maximum-beauty-of-an-array-after-applying-operation
3241-divide-array-into-arrays-with-max-difference
3276-minimum-number-of-pushes-to-type-word-ii
3278-find-the-number-of-ways-to-place-people-i
3321-type-of-triangle
3360-minimum-deletions-to-make-string-k-special
3430-count-days-without-meetings
3622-maximum-frequency-of-an-element-after-performing-operations-i
3657-check-if-grid-can-be-cut-into-sections
3748-sort-matrix-by-diagonals
3859-maximum-product-of-two-digits

Quickselect

0215-kth-largest-element-in-an-array
0347-top-k-frequent-elements
1014-k-closest-points-to-origin
2113-find-the-kth-largest-integer-in-the-array

Simulation

0054-spiral-matrix
0059-spiral-matrix-ii
0412-fizz-buzz
0498-diagonal-traverse
0537-complex-number-multiplication
0735-asteroid-collision
1520-number-of-steps-to-reduce-a-number-in-binary-representation-to-one
1525-queries-on-a-permutation-with-key
2021-remove-all-occurrences-of-a-substring
2232-adding-spaces-to-a-string
2260-divide-a-string-into-groups-of-size-k
2265-partition-array-according-to-given-pivot
2278-find-three-consecutive-integers-that-sum-to-a-given-number
2551-apply-operations-to-an-array
2692-take-gifts-from-the-richest-pile
2695-find-score-of-an-array-after-marking-all-elements
2800-minimum-string-length-after-removing-substrings
3434-find-the-number-of-distinct-colors-among-the-balls
3447-clear-digits
3555-final-array-state-after-k-multiplication-operations-i
3566-find-the-sequence-of-strings-appeared-on-the-screen
3600-find-the-k-th-character-in-string-game-i
3634-find-mirror-score-of-a-string
3708-zigzag-grid-traversal-with-skip
3790-fruits-into-baskets-ii

Matrix

0036-valid-sudoku
0054-spiral-matrix
0059-spiral-matrix-ii
0063-unique-paths-ii
0064-minimum-path-sum
0073-set-matrix-zeroes
0079-word-search
0085-maximal-rectangle
0130-surrounded-regions
0498-diagonal-traverse
0542-01-matrix
0794-swim-in-rising-water
0854-making-a-large-island
0945-snakes-and-ladders
0967-minimum-falling-path-sum
1036-rotting-oranges
1073-number-of-enclaves
1171-shortest-path-in-binary-matrix
1396-count-servers-that-communicate
1402-count-square-submatrices-with-all-ones
1485-minimum-cost-to-make-at-least-one-valid-path-in-a-grid
1572-subrectangle-queries
1628-count-submatrices-with-all-ones
1753-path-with-minimum-effort
2145-grid-game
2160-minimum-operations-to-make-a-uni-value-grid
2631-sort-the-students-by-their-kth-score
2685-first-completely-painted-row-or-column
3227-find-missing-and-repeated-values
3404-minimum-number-of-operations-to-satisfy-conditions
3461-find-the-minimum-area-to-cover-all-ones-i
3708-zigzag-grid-traversal-with-skip
3748-sort-matrix-by-diagonals
3837-grid-teleportation-traversal

Prefix Sum

0209-minimum-size-subarray-sum
0410-split-array-largest-sum
0560-subarray-sum-equals-k
0713-subarray-product-less-than-k
0724-find-pivot-index
0966-binary-subarrays-with-sum
1046-max-consecutive-ones-iii
1370-count-number-of-nice-subarrays
1537-maximum-score-after-splitting-a-string
1538-maximum-points-you-can-obtain-from-cards
1895-minimum-number-of-operations-to-move-all-balls-to-each-box
1940-maximum-xor-for-each-query
2059-unique-length-3-palindromic-subsequences
2145-grid-game
2358-number-of-ways-to-split-array
2529-range-product-queries-of-powers
2571-find-the-pivot-integer
2691-count-vowel-strings-in-ranges
2718-minimum-operations-to-make-all-array-elements-equal
3427-special-array-ii
3475-minimum-operations-to-make-binary-array-elements-equal-to-one-i
3622-maximum-frequency-of-an-element-after-performing-operations-i
3639-zero-array-transformation-i
3643-zero-array-transformation-ii
3653-maximum-subarray-sum-with-length-divisible-by-k
3704-count-partitions-with-even-sum-difference

Binary Indexed Tree

0307-range-sum-query-mutable
0315-count-of-smaller-numbers-after-self
0673-number-of-longest-increasing-subsequence
1525-queries-on-a-permutation-with-key
2526-longest-increasing-subsequence-ii

Counting

0169-majority-element
0229-majority-element-ii
0347-top-k-frequent-elements
0383-ransom-note
0594-longest-harmonious-subsequence
0692-top-k-frequent-words
0900-reordered-power-of-2
0920-uncommon-words-from-two-sentences
1034-subarrays-with-k-different-integers
1364-tuple-with-same-product
1396-count-servers-that-communicate
1502-construct-k-palindrome-strings
1510-find-lucky-integer-in-an-array
1786-count-the-number-of-consistent-strings
1915-check-if-one-string-swap-can-make-strings-equal
2116-count-number-of-pairs-with-absolute-difference-k
2237-longest-palindrome-by-concatenating-two-letter-words
2293-minimum-number-of-steps-to-make-two-strings-anagram-ii
2308-divide-array-into-equal-pairs
2356-largest-combination-with-bitwise-and-greater-than-zero
2448-count-number-of-bad-pairs
2614-maximum-count-of-positive-integer-and-negative-integer
3081-minimum-array-length-after-pair-removals
3267-find-longest-special-substring-that-occurs-thrice-i
3276-minimum-number-of-pushes-to-type-word-ii
3360-minimum-deletions-to-make-string-k-special
3455-minimum-length-of-string-after-operations
3753-maximum-difference-between-even-and-odd-frequency-i
3754-maximum-manhattan-distance-after-k-changes
3872-find-most-frequent-vowel-and-consonant
3914-check-if-any-element-has-prime-frequency

Dynamic Programming

0005-longest-palindromic-substring
0032-longest-valid-parentheses
0042-trapping-rain-water
0044-wildcard-matching
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
0085-maximal-rectangle
0115-distinct-subsequences
0118-pascals-triangle
0119-pascals-triangle-ii
0120-triangle
0122-best-time-to-buy-and-sell-stock-ii
0123-best-time-to-buy-and-sell-stock-iii
0124-binary-tree-maximum-path-sum
0132-palindrome-partitioning-ii
0152-maximum-product-subarray
0188-best-time-to-buy-and-sell-stock-iv
0198-house-robber
0213-house-robber-ii
0300-longest-increasing-subsequence
0309-best-time-to-buy-and-sell-stock-with-cooldown
0312-burst-balloons
0322-coin-change
0368-largest-divisible-subset
0392-is-subsequence
0410-split-array-largest-sum
0413-arithmetic-slices
0416-partition-equal-subset-sum
0435-non-overlapping-intervals
0494-target-sum
0516-longest-palindromic-subsequence
0518-coin-change-ii
0542-01-matrix
0583-delete-operation-for-two-strings
0673-number-of-longest-increasing-subsequence
0678-valid-parenthesis-string
0714-best-time-to-buy-and-sell-stock-with-transaction-fee
0747-min-cost-climbing-stairs
0803-cheapest-flights-within-k-stops
0905-length-of-longest-fibonacci-subsequence
0934-bitwise-ors-of-subarrays
0943-sum-of-subarray-minimums
0954-maximum-sum-circular-subarray
0967-minimum-falling-path-sum
1025-minimum-cost-for-tickets
1121-partition-array-for-maximum-sum
1129-longest-string-chain
1170-shortest-common-supersequence
1250-longest-common-subsequence
1402-count-square-submatrices-with-all-ones
1437-minimum-insertion-steps-to-make-a-string-palindrome
1456-find-the-city-with-the-smallest-number-of-neighbors-at-a-threshold-distance
1586-longest-subarray-of-1s-after-deleting-one-element
1628-count-submatrices-with-all-ones
1669-minimum-cost-to-cut-a-stick
1764-maximum-repeating-substring
1851-maximum-number-of-events-that-can-be-attended-ii
1900-closest-dessert-cost
2090-number-of-ways-to-arrive-at-destination
2233-number-of-smooth-descent-periods-of-a-stock
2262-solving-questions-with-brainpower
2395-longest-binary-subsequence-less-than-or-equal-to-k
2526-longest-increasing-subsequence-ii
2562-count-ways-to-build-good-strings
2882-ways-to-express-an-integer-as-sum-of-powers
3143-longest-unequal-adjacent-groups-subsequence-i
3404-minimum-number-of-operations-to-satisfy-conditions
3487-find-maximum-removals-from-source-string
3490-find-the-maximum-length-of-valid-subsequence-i
3491-find-the-maximum-length-of-valid-subsequence-ii
3892-best-time-to-buy-and-sell-stock-v
3909-minimum-increments-to-equalize-leaf-paths

Memoization

0070-climbing-stairs
2395-longest-binary-subsequence-less-than-or-equal-to-k

Stack

0020-valid-parentheses
0032-longest-valid-parentheses
0042-trapping-rain-water
0084-largest-rectangle-in-histogram
0085-maximal-rectangle
0094-binary-tree-inorder-traversal
0114-flatten-binary-tree-to-linked-list
0143-reorder-list
0144-binary-tree-preorder-traversal
0145-binary-tree-postorder-traversal
0173-binary-search-tree-iterator
0402-remove-k-digits
0496-next-greater-element-i
0503-next-greater-element-ii
0678-valid-parenthesis-string
0735-asteroid-collision
0937-online-stock-span
0943-sum-of-subarray-minimums
0957-minimum-add-to-make-parentheses-valid
1497-design-a-stack-with-increment-operation
1570-final-prices-with-a-special-discount-in-a-shop
1628-count-submatrices-with-all-ones
1737-maximum-nesting-depth-of-the-parentheses
1818-maximum-score-from-removing-substrings
2021-remove-all-occurrences-of-a-substring
2800-minimum-string-length-after-removing-substrings
3445-lexicographically-minimum-string-after-removing-stars
3447-clear-digits
3634-find-mirror-score-of-a-string

Backtracking

0017-letter-combinations-of-a-phone-number
0039-combination-sum
0040-combination-sum-ii
0051-n-queens
0078-subsets
0079-word-search
0090-subsets-ii
0126-word-ladder-ii
0216-combination-sum-iii
0257-binary-tree-paths
0494-target-sum
1900-closest-dessert-cost
1993-sum-of-all-subset-xor-totals
2170-count-number-of-maximum-bitwise-or-subsets

Monotonic Stack

0042-trapping-rain-water
0084-largest-rectangle-in-histogram
0085-maximal-rectangle
0402-remove-k-digits
0496-next-greater-element-i
0503-next-greater-element-ii
0937-online-stock-span
0943-sum-of-subarray-minimums
1570-final-prices-with-a-special-discount-in-a-shop
1628-count-submatrices-with-all-ones

Linked List

0023-merge-k-sorted-lists
0025-reverse-nodes-in-k-group
0114-flatten-binary-tree-to-linked-list
0143-reorder-list
0146-lru-cache
0355-design-twitter

Recursion

0025-reverse-nodes-in-k-group
0044-wildcard-matching
0050-powx-n
0143-reorder-list
0231-power-of-two
0326-power-of-three
0342-power-of-four
2050-count-good-numbers
3600-find-the-k-th-character-in-string-game-i

Bit Manipulation

0078-subsets
0090-subsets-ii
0136-single-number
0137-single-number-ii
0222-count-complete-tree-nodes
0231-power-of-two
0260-single-number-iii
0342-power-of-four
0371-sum-of-two-integers
0389-find-the-difference
0934-bitwise-ors-of-subarrays
1520-number-of-steps-to-reduce-a-number-in-binary-representation-to-one
1610-xor-operation-in-an-array
1786-count-the-number-of-consistent-strings
1940-maximum-xor-for-each-query
1993-sum-of-all-subset-xor-totals
2059-unique-length-3-palindromic-subsequences
2170-count-number-of-maximum-bitwise-or-subsets
2308-divide-array-into-equal-pairs
2356-largest-combination-with-bitwise-and-greater-than-zero
2478-longest-nice-subarray
2498-smallest-subarrays-with-maximum-bitwise-or
2503-longest-subarray-with-maximum-bitwise-and
2509-minimize-xor
2529-range-product-queries-of-powers
2533-bitwise-xor-of-all-pairings
2621-find-xor-beauty-of-array
2766-find-the-prefix-common-array-of-two-arrays
2792-neighboring-bitwise-xor
3428-find-the-xor-of-numbers-which-appear-twice
3475-minimum-operations-to-make-binary-array-elements-equal-to-one-i
3600-find-the-k-th-character-in-string-game-i
3820-number-of-unique-xor-triplets-ii
3824-number-of-unique-xor-triplets-i

Depth-First Search

0079-word-search
0094-binary-tree-inorder-traversal
0098-validate-binary-search-tree
0099-recover-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
0114-flatten-binary-tree-to-linked-list
0124-binary-tree-maximum-path-sum
0130-surrounded-regions
0144-binary-tree-preorder-traversal
0145-binary-tree-postorder-traversal
0199-binary-tree-right-side-view
0207-course-schedule
0210-course-schedule-ii
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
0257-binary-tree-paths
0297-serialize-and-deserialize-binary-tree
0386-lexicographical-numbers
0543-diameter-of-binary-tree
0547-number-of-provinces
0637-average-of-levels-in-binary-tree
0653-two-sum-iv-input-is-a-bst
0662-maximum-width-of-binary-tree
0721-accounts-merge
0744-network-delay-time
0794-swim-in-rising-water
0801-is-graph-bipartite
0803-cheapest-flights-within-k-stops
0820-find-eventual-safe-states
0854-making-a-large-island
0893-all-nodes-distance-k-in-binary-tree
0984-most-stones-removed-with-same-row-or-column
1029-vertical-order-traversal-of-a-binary-tree
1073-number-of-enclaves
1218-lowest-common-ancestor-of-deepest-leaves
1300-critical-connections-in-a-network
1350-remove-sub-folders-from-the-filesystem
1396-count-servers-that-communicate
1442-number-of-operations-to-make-network-connected
1498-find-a-corresponding-node-of-a-binary-tree-in-a-clone-of-that-tree
1753-path-with-minimum-effort
2438-find-closest-node-to-given-two-nodes
2461-amount-of-time-for-binary-tree-to-be-infected
2793-count-the-number-of-complete-components
3633-maximize-the-number-of-target-nodes-after-connecting-trees-i
3909-minimum-increments-to-equalize-leaf-paths

Trie

0386-lexicographical-numbers
0692-top-k-frequent-words
1350-remove-sub-folders-from-the-filesystem
3309-count-prefix-and-suffix-pairs-i

Sliding Window

0003-longest-substring-without-repeating-characters
0076-minimum-window-substring
0209-minimum-size-subarray-sum
0239-sliding-window-maximum
0413-arithmetic-slices
0424-longest-repeating-character-replacement
0567-permutation-in-string
0594-longest-harmonious-subsequence
0658-find-k-closest-elements
0713-subarray-product-less-than-k
0940-fruit-into-baskets
0966-binary-subarrays-with-sum
1034-subarrays-with-k-different-integers
1046-max-consecutive-ones-iii
1370-count-number-of-nice-subarrays
1423-maximum-number-of-occurrences-of-a-substring
1460-number-of-substrings-containing-all-three-characters
1538-maximum-points-you-can-obtain-from-cards
1549-longest-continuous-subarray-with-absolute-diff-less-than-or-equal-to-limit
1586-longest-subarray-of-1s-after-deleting-one-element
1813-maximum-erasure-value
2463-minimum-recolors-to-get-k-consecutive-black-blocks
2478-longest-nice-subarray
2498-smallest-subarrays-with-maximum-bitwise-or
2891-maximum-beauty-of-an-array-after-applying-operation
3150-shortest-and-lexicographically-smallest-beautiful-string
3267-find-longest-special-substring-that-occurs-thrice-i
3475-minimum-operations-to-make-binary-array-elements-equal-to-one-i
3483-alternating-groups-ii
3569-count-of-substrings-containing-every-vowel-and-k-consonants-ii
3570-count-of-substrings-containing-every-vowel-and-k-consonants-i
3622-maximum-frequency-of-an-element-after-performing-operations-i
3743-reschedule-meetings-for-maximum-free-time-i
3907-count-prime-gap-balanced-subarrays

Union Find

0128-longest-consecutive-sequence
0130-surrounded-regions
0547-number-of-provinces
0721-accounts-merge
0794-swim-in-rising-water
0801-is-graph-bipartite
0854-making-a-large-island
0984-most-stones-removed-with-same-row-or-column
1073-number-of-enclaves
1396-count-servers-that-communicate
1442-number-of-operations-to-make-network-connected
1753-path-with-minimum-effort
2793-count-the-number-of-complete-components
3838-path-existence-queries-in-a-graph-i

Bucket Sort

0347-top-k-frequent-elements
0692-top-k-frequent-words

String Matching

0214-shortest-palindrome
0812-rotate-string
1508-longest-happy-prefix
1524-string-matching-in-an-array
1566-check-if-a-word-occurs-as-a-prefix-of-any-word-in-a-sentence
1764-maximum-repeating-substring
2292-counting-words-with-a-given-prefix
3309-count-prefix-and-suffix-pairs-i
3684-substring-matching-pattern

Enumeration

0900-reordered-power-of-2
1656-count-good-triplets
1993-sum-of-all-subset-xor-totals
2170-count-number-of-maximum-bitwise-or-subsets
2215-finding-3-digit-even-numbers
2351-number-of-ways-to-buy-pens-and-pencils
2998-count-symmetric-integers
3201-distribute-candies-among-children-ii
3278-find-the-number-of-ways-to-place-people-i
3741-reschedule-meetings-for-maximum-free-time-ii
3820-number-of-unique-xor-triplets-ii
3868-find-maximum-area-of-a-triangle

Combinatorics

0062-unique-paths
1993-sum-of-all-subset-xor-totals
3201-distribute-candies-among-children-ii

Rolling Hash

0214-shortest-palindrome
1508-longest-happy-prefix
3309-count-prefix-and-suffix-pairs-i

Hash Function

0214-shortest-palindrome
1508-longest-happy-prefix
3309-count-prefix-and-suffix-pairs-i

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
0126-word-ladder-ii
0127-word-ladder
0130-surrounded-regions
0199-binary-tree-right-side-view
0207-course-schedule
0210-course-schedule-ii
0226-invert-binary-tree
0297-serialize-and-deserialize-binary-tree
0322-coin-change
0542-01-matrix
0547-number-of-provinces
0637-average-of-levels-in-binary-tree
0653-two-sum-iv-input-is-a-bst
0662-maximum-width-of-binary-tree
0721-accounts-merge
0744-network-delay-time
0794-swim-in-rising-water
0801-is-graph-bipartite
0803-cheapest-flights-within-k-stops
0820-find-eventual-safe-states
0854-making-a-large-island
0893-all-nodes-distance-k-in-binary-tree
0945-snakes-and-ladders
1029-vertical-order-traversal-of-a-binary-tree
1036-rotting-oranges
1073-number-of-enclaves
1171-shortest-path-in-binary-matrix
1218-lowest-common-ancestor-of-deepest-leaves
1396-count-servers-that-communicate
1442-number-of-operations-to-make-network-connected
1485-minimum-cost-to-make-at-least-one-valid-path-in-a-grid
1498-find-a-corresponding-node-of-a-binary-tree-in-a-clone-of-that-tree
1753-path-with-minimum-effort
2461-amount-of-time-for-binary-tree-to-be-infected
2793-count-the-number-of-complete-components
3633-maximize-the-number-of-target-nodes-after-connecting-trees-i
3837-grid-teleportation-traversal

Segment Tree

0307-range-sum-query-mutable
0315-count-of-smaller-numbers-after-self
0673-number-of-longest-increasing-subsequence
2526-longest-increasing-subsequence-ii
3790-fruits-into-baskets-ii
3791-fruits-into-baskets-iii

Ordered Set

0315-count-of-smaller-numbers-after-self
1549-longest-continuous-subarray-with-absolute-diff-less-than-or-equal-to-limit
1946-minimum-absolute-sum-difference
2434-design-a-number-container-system
3790-fruits-into-baskets-ii
3791-fruits-into-baskets-iii

Graph

0207-course-schedule
0210-course-schedule-ii
0547-number-of-provinces
0744-network-delay-time
0801-is-graph-bipartite
0803-cheapest-flights-within-k-stops
0820-find-eventual-safe-states
0984-most-stones-removed-with-same-row-or-column
1300-critical-connections-in-a-network
1442-number-of-operations-to-make-network-connected
1456-find-the-city-with-the-smallest-number-of-neighbors-at-a-threshold-distance
1485-minimum-cost-to-make-at-least-one-valid-path-in-a-grid
1738-maximal-network-rank
2090-number-of-ways-to-arrive-at-destination
2220-find-all-possible-recipes-from-given-supplies
2438-find-closest-node-to-given-two-nodes
2793-count-the-number-of-complete-components
3838-path-existence-queries-in-a-graph-i

Topological Sort

0207-course-schedule
0210-course-schedule-ii
0820-find-eventual-safe-states
2090-number-of-ways-to-arrive-at-destination
2220-find-all-possible-recipes-from-given-supplies

Queue

0239-sliding-window-maximum
0954-maximum-sum-circular-subarray
1549-longest-continuous-subarray-with-absolute-diff-less-than-or-equal-to-limit
2526-longest-increasing-subsequence-ii
3475-minimum-operations-to-make-binary-array-elements-equal-to-one-i
3907-count-prime-gap-balanced-subarrays

Shortest Path

0744-network-delay-time
0803-cheapest-flights-within-k-stops
1456-find-the-city-with-the-smallest-number-of-neighbors-at-a-threshold-distance
1485-minimum-cost-to-make-at-least-one-valid-path-in-a-grid
2090-number-of-ways-to-arrive-at-destination

Iterator

0173-binary-search-tree-iterator

Biconnected Component

1300-critical-connections-in-a-network

Monotonic Queue

0239-sliding-window-maximum
0954-maximum-sum-circular-subarray
1549-longest-continuous-subarray-with-absolute-diff-less-than-or-equal-to-limit
2526-longest-increasing-subsequence-ii
3907-count-prime-gap-balanced-subarrays

Merge Sort

0023-merge-k-sorted-lists
0315-count-of-smaller-numbers-after-self

Doubly-Linked List

0146-lru-cache