A collection of LeetCode questions to ace the coding interview! - Created using LeetHub v2

LeetCode Topics

Array

0015-3sum
0036-valid-sudoku
0042-trapping-rain-water
0049-group-anagrams
0054-spiral-matrix
0055-jump-game
0056-merge-intervals
0073-set-matrix-zeroes
0075-sort-colors
0118-pascals-triangle
0120-triangle
0162-find-peak-element
0170-two-sum-iii-data-structure-design
0200-number-of-islands
0215-kth-largest-element-in-an-array
0253-meeting-rooms-ii
0255-verify-preorder-sequence-in-binary-search-tree
0259-3sum-smaller
0302-smallest-rectangle-enclosing-black-pixels
0311-sparse-matrix-multiplication
0317-shortest-distance-from-all-buildings
0325-maximum-size-subarray-sum-equals-k
0346-moving-average-from-data-stream
0347-top-k-frequent-elements
0353-design-snake-game
0361-bomb-enemy
0368-largest-divisible-subset
0370-range-addition
0373-find-k-pairs-with-smallest-sums
0407-trapping-rain-water-ii
0416-partition-equal-subset-sum
0474-ones-and-zeroes
0498-diagonal-traverse
0523-continuous-subarray-sum
0527-word-abbreviation
0594-longest-harmonious-subsequence
0611-valid-triangle-number
0621-task-scheduler
0656-coin-path
0683-k-empty-slots
0695-max-area-of-island
0713-subarray-product-less-than-k
0717-1-bit-and-2-bit-characters
0797-rabbits-in-forest
0830-largest-triangle-area
0934-bitwise-ors-of-subarrays
0940-fruit-into-baskets
1006-vowel-spellchecker
1018-binary-prefix-divisible-by-5
1067-campus-bikes-ii
1098-largest-unique-number
1102-check-if-a-number-is-majority-element-in-a-sorted-array
1107-minimum-swaps-to-group-all-1s-together
1108-analyze-user-website-visit-pattern
1118-divide-array-into-increasing-sequences
1132-before-and-after-puzzle
1134-shortest-distance-to-target-color
1143-find-smallest-common-element-in-all-rows
1227-number-of-equivalent-domino-pairs
1262-greatest-sum-divisible-by-three
1293-three-consecutive-odds
1352-maximum-profit-in-job-scheduling
1366-first-unique-number
1402-count-square-submatrices-with-all-ones
1421-find-numbers-with-even-number-of-digits
1478-maximum-number-of-events-that-can-be-attended
1483-rank-teams-by-votes
1510-find-lucky-integer-in-an-array
1586-longest-subarray-of-1s-after-deleting-one-element
1590-make-sum-divisible-by-p
1621-number-of-subsequences-that-satisfy-the-given-sum-condition
1633-minimum-number-of-increments-on-subarrays-to-form-a-target-array
1656-count-good-triplets
1700-minimum-time-to-make-rope-colorful
1713-dot-product-of-two-sparse-vectors
1813-maximum-erasure-value
1834-minimum-number-of-people-to-teach
1851-maximum-number-of-events-that-can-be-attended-ii
1917-maximum-average-pass-ratio
1993-sum-of-all-subset-xor-totals
1995-finding-pairs-with-a-certain-sum
2023-design-movie-rental-system
2048-build-array-from-permutation
2118-maximum-earnings-from-taxi
2137-final-value-of-variable-after-performing-operations
2144-maximum-difference-between-increasing-elements
2150-kth-smallest-product-of-two-sorted-arrays
2160-minimum-operations-to-make-a-uni-value-grid
2169-simple-bank-system
2170-count-number-of-maximum-bitwise-or-subsets
2180-maximum-number-of-tasks-you-can-assign
2204-find-subsequence-of-length-k-with-the-largest-sum
2215-finding-3-digit-even-numbers
2220-find-all-possible-recipes-from-given-supplies
2229-maximum-fruits-harvested-after-at-most-k-steps
2237-longest-palindrome-by-concatenating-two-letter-words
2244-number-of-laser-beams-in-a-bank
2249-count-the-hidden-sequences
2262-solving-questions-with-brainpower
2265-partition-array-according-to-given-pivot
2267-minimum-difference-in-sums-after-removal-of-elements
2274-keep-multiplying-found-values-by-two
2277-count-equal-and-divisible-pairs-in-an-array
2280-count-good-triplets-in-an-array
2307-replace-non-coprime-numbers-in-array
2308-divide-array-into-equal-pairs
2316-count-hills-and-valleys-in-an-array
2320-find-all-k-distant-indices-in-an-array
2324-find-triangular-sum-of-an-array
2387-partition-array-such-that-maximum-difference-is-k
2394-count-subarrays-with-score-less-than-k
2400-minimum-score-after-removals-on-a-tree
2429-design-a-food-rating-system
2432-number-of-zero-filled-subarrays
2435-paths-in-matrix-whose-sum-is-divisible-by-k
2479-meeting-rooms-iii
2497-maximum-matching-of-players-with-trainers
2498-smallest-subarrays-with-maximum-bitwise-or
2503-longest-subarray-with-maximum-bitwise-and
2527-count-subarrays-with-fixed-bounds
2529-range-product-queries-of-powers
2551-apply-operations-to-an-array
2555-design-sql
2588-maximum-number-of-points-from-grid-queries
2607-minimum-subarrays-in-a-valid-split
2614-maximum-count-of-positive-integer-and-negative-integer
2625-increment-submatrices-by-one
2626-count-the-number-of-good-subarrays
2661-smallest-missing-non-negative-integer-after-operations
2665-minimum-time-to-repair-cars
2681-put-marbles-in-bags
2689-rearranging-fruits
2690-house-robber-iv
2699-count-the-number-of-fair-pairs
2707-merge-two-2d-arrays-by-summing-values
2720-minimize-the-maximum-difference-of-pairs
2753-minimum-number-of-operations-to-make-all-array-elements-equal-to-1
2856-count-complete-subarrays-in-an-array
2868-continuous-subarrays
2880-find-the-closest-marked-node
2888-minimum-index-of-a-valid-split
2915-count-of-interesting-subarrays
3001-apply-operations-to-maximize-score
3142-longest-unequal-adjacent-groups-subsequence-ii
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
3213-count-subarrays-where-max-element-appears-at-least-k-times
3241-divide-array-into-arrays-with-max-difference
3242-count-elements-with-maximum-frequency
3251-maximum-area-of-longest-diagonal-rectangle
3277-find-the-number-of-ways-to-place-people-ii
3278-find-the-number-of-ways-to-place-people-i
3307-find-the-maximum-sum-of-node-values
3321-type-of-triangle
3348-minimum-cost-walk-in-weighted-graph
3372-longest-strictly-increasing-or-strictly-decreasing-subarray
3381-maximum-subarray-sum-with-length-divisible-by-k
3430-count-days-without-meetings
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
3490-find-the-maximum-length-of-valid-subsequence-i
3491-find-the-maximum-length-of-valid-subsequence-ii
3512-minimum-operations-to-make-array-sum-divisible-by-k
3592-find-x-sum-of-all-k-long-subarrays-ii
3594-identify-the-largest-outlier-in-an-array
3610-find-x-sum-of-all-k-long-subarrays-i
3619-adjacent-increasing-subarrays-detection-ii
3620-maximum-number-of-distinct-elements-after-operations
3621-minimum-operations-to-make-array-values-equal-to-k
3622-maximum-frequency-of-an-element-after-performing-operations-i
3627-find-minimum-time-to-reach-last-room-i
3628-find-minimum-time-to-reach-last-room-ii
3639-zero-array-transformation-i
3640-maximum-frequency-of-an-element-after-performing-operations-ii
3643-zero-array-transformation-ii
3647-zero-array-transformation-iii
3648-find-the-maximum-number-of-fruits-collected
3656-minimum-number-of-operations-to-make-elements-in-array-distinct
3657-check-if-grid-can-be-cut-into-sections
3685-count-subarrays-of-length-three-with-a-condition
3733-length-of-longest-v-shaped-diagonal-segment
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
3788-maximum-unique-subarray-sum-after-deletion
3789-maximize-subarrays-after-removing-one-conflicting-pair
3790-fruits-into-baskets-ii
3791-fruits-into-baskets-iii
3797-design-spreadsheet
3827-implement-router
3834-minimum-operations-to-convert-all-elements-to-zero
3863-power-grid-maintenance

Bit Manipulation

0231-power-of-two
0266-palindrome-permutation
0342-power-of-four
0934-bitwise-ors-of-subarrays
1018-binary-prefix-divisible-by-5
1067-campus-bikes-ii
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
2400-minimum-score-after-removals-on-a-tree
2498-smallest-subarrays-with-maximum-bitwise-or
2503-longest-subarray-with-maximum-bitwise-and
2529-range-product-queries-of-powers
2837-minimum-operations-to-make-the-integer-zero
3307-find-the-maximum-sum-of-node-values
3348-minimum-cost-walk-in-weighted-graph
3475-minimum-operations-to-make-binary-array-elements-equal-to-one-i
3600-find-the-k-th-character-in-string-game-i

Queue

0346-moving-average-from-data-stream
0353-design-snake-game
0683-k-empty-slots
1366-first-unique-number
2180-maximum-number-of-tasks-you-can-assign
2408-number-of-people-aware-of-a-secret
2527-count-subarrays-with-fixed-bounds
2868-continuous-subarrays
3475-minimum-operations-to-make-binary-array-elements-equal-to-one-i
3827-implement-router

Sliding Window

0003-longest-substring-without-repeating-characters
0594-longest-harmonious-subsequence
0683-k-empty-slots
0713-subarray-product-less-than-k
0867-new-21-game
0940-fruit-into-baskets
1084-find-k-length-substrings-with-no-repeated-characters
1107-minimum-swaps-to-group-all-1s-together
1460-number-of-substrings-containing-all-three-characters
1586-longest-subarray-of-1s-after-deleting-one-element
1813-maximum-erasure-value
2229-maximum-fruits-harvested-after-at-most-k-steps
2394-count-subarrays-with-score-less-than-k
2498-smallest-subarrays-with-maximum-bitwise-or
2527-count-subarrays-with-fixed-bounds
2626-count-the-number-of-good-subarrays
2856-count-complete-subarrays-in-an-array
2868-continuous-subarrays
3213-count-subarrays-where-max-element-appears-at-least-k-times
3475-minimum-operations-to-make-binary-array-elements-equal-to-one-i
3483-alternating-groups-ii
3592-find-x-sum-of-all-k-long-subarrays-ii
3610-find-x-sum-of-all-k-long-subarrays-i
3622-maximum-frequency-of-an-element-after-performing-operations-i
3640-maximum-frequency-of-an-element-after-performing-operations-ii
3743-reschedule-meetings-for-maximum-free-time-i
3761-maximum-difference-between-even-and-odd-frequency-ii

Prefix Sum

0253-meeting-rooms-ii
0325-maximum-size-subarray-sum-equals-k
0370-range-addition
0523-continuous-subarray-sum
0713-subarray-product-less-than-k
1590-make-sum-divisible-by-p
2059-unique-length-3-palindromic-subsequences
2229-maximum-fruits-harvested-after-at-most-k-steps
2249-count-the-hidden-sequences
2394-count-subarrays-with-score-less-than-k
2529-range-product-queries-of-powers
2625-increment-submatrices-by-one
2915-count-of-interesting-subarrays
3381-maximum-subarray-sum-with-length-divisible-by-k
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
3640-maximum-frequency-of-an-element-after-performing-operations-ii
3643-zero-array-transformation-ii
3647-zero-array-transformation-iii
3761-maximum-difference-between-even-and-odd-frequency-ii
3789-maximize-subarrays-after-removing-one-conflicting-pair

Hash Table

0003-longest-substring-without-repeating-characters
0036-valid-sudoku
0049-group-anagrams
0073-set-matrix-zeroes
0146-lru-cache
0166-fraction-to-recurring-decimal
0170-two-sum-iii-data-structure-design
0266-palindrome-permutation
0311-sparse-matrix-multiplication
0314-binary-tree-vertical-order-traversal
0325-maximum-size-subarray-sum-equals-k
0347-top-k-frequent-elements
0353-design-snake-game
0359-logger-rate-limiter
0523-continuous-subarray-sum
0594-longest-harmonious-subsequence
0621-task-scheduler
0768-partition-labels
0778-reorganize-string
0797-rabbits-in-forest
0900-reordered-power-of-2
0940-fruit-into-baskets
1006-vowel-spellchecker
1015-smallest-integer-divisible-by-k
1084-find-k-length-substrings-with-no-repeated-characters
1098-largest-unique-number
1108-analyze-user-website-visit-pattern
1125-design-file-system
1132-before-and-after-puzzle
1143-find-smallest-common-element-in-all-rows
1218-lowest-common-ancestor-of-deepest-leaves
1227-number-of-equivalent-domino-pairs
1264-maximum-number-of-words-you-can-type
1366-first-unique-number
1460-number-of-substrings-containing-all-three-characters
1483-rank-teams-by-votes
1500-count-largest-group
1510-find-lucky-integer-in-an-array
1590-make-sum-divisible-by-p
1713-dot-product-of-two-sparse-vectors
1790-lowest-common-ancestor-of-a-binary-tree-iii
1813-maximum-erasure-value
1834-minimum-number-of-people-to-teach
1986-largest-color-value-in-a-directed-graph
1995-finding-pairs-with-a-certain-sum
2023-design-movie-rental-system
2059-unique-length-3-palindromic-subsequences
2118-maximum-earnings-from-taxi
2161-stock-price-fluctuation
2169-simple-bank-system
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
2274-keep-multiplying-found-values-by-two
2308-divide-array-into-equal-pairs
2429-design-a-food-rating-system
2479-meeting-rooms-iii
2487-optimal-partition-of-string
2555-design-sql
2626-count-the-number-of-good-subarrays
2661-smallest-missing-non-negative-integer-after-operations
2689-rearranging-fruits
2707-merge-two-2d-arrays-by-summing-values
2856-count-complete-subarrays-in-an-array
2888-minimum-index-of-a-valid-split
2915-count-of-interesting-subarrays
3242-count-elements-with-maximum-frequency
3360-minimum-deletions-to-make-string-k-special
3381-maximum-subarray-sum-with-length-divisible-by-k
3445-lexicographically-minimum-string-after-removing-stars
3548-find-the-count-of-good-integers
3592-find-x-sum-of-all-k-long-subarrays-ii
3594-identify-the-largest-outlier-in-an-array
3610-find-x-sum-of-all-k-long-subarrays-i
3621-minimum-operations-to-make-array-values-equal-to-k
3629-total-characters-in-string-after-transformations-i
3630-total-characters-in-string-after-transformations-ii
3656-minimum-number-of-operations-to-make-elements-in-array-distinct
3678-design-task-manager
3753-maximum-difference-between-even-and-odd-frequency-i
3754-maximum-manhattan-distance-after-k-changes
3788-maximum-unique-subarray-sum-after-deletion
3797-design-spreadsheet
3827-implement-router
3834-minimum-operations-to-convert-all-elements-to-zero
3863-power-grid-maintenance
3872-find-most-frequent-vowel-and-consonant

String

0003-longest-substring-without-repeating-characters
0038-count-and-say
0049-group-anagrams
0165-compare-version-numbers
0166-fraction-to-recurring-decimal
0266-palindrome-permutation
0408-valid-word-abbreviation
0474-ones-and-zeroes
0527-word-abbreviation
0680-valid-palindrome-ii
0768-partition-labels
0778-reorganize-string
0868-push-dominoes
1006-vowel-spellchecker
1051-shortest-way-to-form-string
1058-lexicographically-smallest-equivalent-string
1084-find-k-length-substrings-with-no-repeated-characters
1108-analyze-user-website-visit-pattern
1125-design-file-system
1132-before-and-after-puzzle
1264-maximum-number-of-words-you-can-type
1302-delete-characters-to-make-fancy-string
1371-minimum-remove-to-make-valid-parentheses
1460-number-of-substrings-containing-all-three-characters
1483-rank-teams-by-votes
1700-minimum-time-to-make-rope-colorful
1894-merge-strings-alternately
2059-unique-length-3-palindromic-subsequences
2137-final-value-of-variable-after-performing-operations
2140-longest-subsequence-repeated-k-times
2220-find-all-possible-recipes-from-given-supplies
2237-longest-palindrome-by-concatenating-two-letter-words
2244-number-of-laser-beams-in-a-bank
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
2429-design-a-food-rating-system
2487-optimal-partition-of-string
2555-design-sql
2887-sort-vowels-in-a-string
3142-longest-unequal-adjacent-groups-subsequence-ii
3143-longest-unequal-adjacent-groups-subsequence-i
3194-find-words-containing-character
3243-count-the-number-of-powerful-integers
3360-minimum-deletions-to-make-string-k-special
3396-valid-word
3445-lexicographically-minimum-string-after-removing-stars
3462-vowels-game-in-a-string
3493-maximum-number-of-operations-to-move-ones-to-the-end
3617-find-the-original-typed-string-i
3629-total-characters-in-string-after-transformations-i
3630-total-characters-in-string-after-transformations-ii
3637-count-number-of-balanced-permutations
3683-find-the-lexicographically-largest-string-from-the-box-i
3753-maximum-difference-between-even-and-odd-frequency-i
3754-maximum-manhattan-distance-after-k-changes
3761-maximum-difference-between-even-and-odd-frequency-ii
3797-design-spreadsheet
3872-find-most-frequent-vowel-and-consonant

Counting

0347-top-k-frequent-elements
0594-longest-harmonious-subsequence
0621-task-scheduler
0778-reorganize-string
0900-reordered-power-of-2
1118-divide-array-into-increasing-sequences
1143-find-smallest-common-element-in-all-rows
1227-number-of-equivalent-domino-pairs
1483-rank-teams-by-votes
1510-find-lucky-integer-in-an-array
1986-largest-color-value-in-a-directed-graph
2140-longest-subsequence-repeated-k-times
2237-longest-palindrome-by-concatenating-two-letter-words
2308-divide-array-into-equal-pairs
2614-maximum-count-of-positive-integer-and-negative-integer
3242-count-elements-with-maximum-frequency
3360-minimum-deletions-to-make-string-k-special
3493-maximum-number-of-operations-to-move-ones-to-the-end
3594-identify-the-largest-outlier-in-an-array
3629-total-characters-in-string-after-transformations-i
3630-total-characters-in-string-after-transformations-ii
3753-maximum-difference-between-even-and-odd-frequency-i
3754-maximum-manhattan-distance-after-k-changes
3872-find-most-frequent-vowel-and-consonant

Binary Search

0162-find-peak-element
0259-3sum-smaller
0302-smallest-rectangle-enclosing-black-pixels
0611-valid-triangle-number
0713-subarray-product-less-than-k
1051-shortest-way-to-form-string
1102-check-if-a-number-is-majority-element-in-a-sorted-array
1134-shortest-distance-to-target-color
1143-find-smallest-common-element-in-all-rows
1352-maximum-profit-in-job-scheduling
1621-number-of-subsequences-that-satisfy-the-given-sum-condition
1851-maximum-number-of-events-that-can-be-attended-ii
2118-maximum-earnings-from-taxi
2150-kth-smallest-product-of-two-sorted-arrays
2180-maximum-number-of-tasks-you-can-assign
2229-maximum-fruits-harvested-after-at-most-k-steps
2280-count-good-triplets-in-an-array
2394-count-subarrays-with-score-less-than-k
2498-smallest-subarrays-with-maximum-bitwise-or
2614-maximum-count-of-positive-integer-and-negative-integer
2665-minimum-time-to-repair-cars
2690-house-robber-iv
2699-count-the-number-of-fair-pairs
2720-minimize-the-maximum-difference-of-pairs
3619-adjacent-increasing-subarrays-detection-ii
3622-maximum-frequency-of-an-element-after-performing-operations-i
3640-maximum-frequency-of-an-element-after-performing-operations-ii
3643-zero-array-transformation-ii
3790-fruits-into-baskets-ii
3791-fruits-into-baskets-iii
3827-implement-router

Math

0166-fraction-to-recurring-decimal
0231-power-of-two
0326-power-of-three
0342-power-of-four
0368-largest-divisible-subset
0523-continuous-subarray-sum
0797-rabbits-in-forest
0826-soup-servings
0830-largest-triangle-area
0867-new-21-game
0900-reordered-power-of-2
1015-smallest-integer-divisible-by-k
1411-convert-binary-number-in-a-linked-list-to-integer
1421-find-numbers-with-even-number-of-digits
1440-convert-integer-to-the-sum-of-two-no-zero-integers
1448-maximum-69-number
1500-count-largest-group
1889-check-if-number-is-a-sum-of-powers-of-three
1993-sum-of-all-subset-xor-totals
2050-count-good-numbers
2160-minimum-operations-to-make-a-uni-value-grid
2202-sum-of-k-mirror-numbers
2244-number-of-laser-beams-in-a-bank
2307-replace-non-coprime-numbers-in-array
2324-find-triangular-sum-of-an-array
2383-add-two-integers
2415-count-the-number-of-ideal-arrays
2432-number-of-zero-filled-subarrays
2607-minimum-subarrays-in-a-valid-split
2610-closest-prime-numbers-in-range
2649-count-total-number-of-colored-cells
2661-smallest-missing-non-negative-integer-after-operations
2753-minimum-number-of-operations-to-make-all-array-elements-equal-to-1
2998-count-symmetric-integers
3001-apply-operations-to-maximize-score
3172-divisible-and-non-divisible-sums-difference
3201-distribute-candies-among-children-ii
3216-distribute-candies-among-children-iii
3243-count-the-number-of-powerful-integers
3277-find-the-number-of-ways-to-place-people-ii
3278-find-the-number-of-ways-to-place-people-i
3279-alice-and-bob-playing-flower-game
3321-type-of-triangle
3336-water-bottles-ii
3462-vowels-game-in-a-string
3512-minimum-operations-to-make-array-sum-divisible-by-k
3548-find-the-count-of-good-integers
3600-find-the-k-th-character-in-string-game-i
3629-total-characters-in-string-after-transformations-i
3630-total-characters-in-string-after-transformations-ii
3637-count-number-of-balanced-permutations
3682-count-the-number-of-arrays-with-k-matching-adjacent-elements
3754-maximum-manhattan-distance-after-k-changes
3830-find-closest-person

Two Pointers

0015-3sum
0042-trapping-rain-water
0075-sort-colors
0165-compare-version-numbers
0170-two-sum-iii-data-structure-design
0253-meeting-rooms-ii
0259-3sum-smaller
0272-closest-binary-search-tree-value-ii
0408-valid-word-abbreviation
0611-valid-triangle-number
0680-valid-palindrome-ii
0768-partition-labels
0868-push-dominoes
1051-shortest-way-to-form-string
1621-number-of-subsequences-that-satisfy-the-given-sum-condition
1713-dot-product-of-two-sparse-vectors
1790-lowest-common-ancestor-of-a-binary-tree-iii
1894-merge-strings-alternately
2265-partition-array-according-to-given-pivot
2320-find-all-k-distant-indices-in-an-array
2414-move-pieces-to-obtain-a-string
2497-maximum-matching-of-players-with-trainers
2551-apply-operations-to-an-array
2588-maximum-number-of-points-from-grid-queries
2699-count-the-number-of-fair-pairs
2707-merge-two-2d-arrays-by-summing-values
3683-find-the-lexicographically-largest-string-from-the-box-i

Simulation

0054-spiral-matrix
0353-design-snake-game
0498-diagonal-traverse
2048-build-array-from-permutation
2137-final-value-of-variable-after-performing-operations
2169-simple-bank-system
2265-partition-array-according-to-given-pivot
2274-keep-multiplying-found-values-by-two
2324-find-triangular-sum-of-an-array
2408-number-of-people-aware-of-a-secret
2479-meeting-rooms-iii
2551-apply-operations-to-an-array
3336-water-bottles-ii
3600-find-the-k-th-character-in-string-game-i
3790-fruits-into-baskets-ii

Number Theory

2307-replace-non-coprime-numbers-in-array
2415-count-the-number-of-ideal-arrays
2607-minimum-subarrays-in-a-valid-split
2610-closest-prime-numbers-in-range
2753-minimum-number-of-operations-to-make-all-array-elements-equal-to-1
3001-apply-operations-to-maximize-score

Union Find

0200-number-of-islands
0323-number-of-connected-components-in-an-undirected-graph
0695-max-area-of-island
1058-lexicographically-smallest-equivalent-string
1100-connecting-cities-with-minimum-cost
2588-maximum-number-of-points-from-grid-queries
2793-count-the-number-of-complete-components
3348-minimum-cost-walk-in-weighted-graph
3863-power-grid-maintenance

Graph

0323-number-of-connected-components-in-an-undirected-graph
1100-connecting-cities-with-minimum-cost
1986-largest-color-value-in-a-directed-graph
2090-number-of-ways-to-arrive-at-destination
2220-find-all-possible-recipes-from-given-supplies
2793-count-the-number-of-complete-components
2880-find-the-closest-marked-node
3348-minimum-cost-walk-in-weighted-graph
3627-find-minimum-time-to-reach-last-room-i
3628-find-minimum-time-to-reach-last-room-ii
3863-power-grid-maintenance

Topological Sort

1986-largest-color-value-in-a-directed-graph
2090-number-of-ways-to-arrive-at-destination
2220-find-all-possible-recipes-from-given-supplies

Depth-First Search

0098-validate-binary-search-tree
0124-binary-tree-maximum-path-sum
0199-binary-tree-right-side-view
0200-number-of-islands
0272-closest-binary-search-tree-value-ii
0285-inorder-successor-in-bst
0302-smallest-rectangle-enclosing-black-pixels
0314-binary-tree-vertical-order-traversal
0323-number-of-connected-components-in-an-undirected-graph
0333-largest-bst-subtree
0364-nested-list-weight-sum-ii
0386-lexicographical-numbers
0543-diameter-of-binary-tree
0663-equal-tree-partition
0695-max-area-of-island
0758-convert-binary-search-tree-to-sorted-doubly-linked-list
0975-range-sum-of-bst
1218-lowest-common-ancestor-of-deepest-leaves
2400-minimum-score-after-removals-on-a-tree
2793-count-the-number-of-complete-components
2872-maximum-number-of-k-divisible-components
3863-power-grid-maintenance

Breadth-First Search

0199-binary-tree-right-side-view
0200-number-of-islands
0302-smallest-rectangle-enclosing-black-pixels
0314-binary-tree-vertical-order-traversal
0317-shortest-distance-from-all-buildings
0323-number-of-connected-components-in-an-undirected-graph
0364-nested-list-weight-sum-ii
0407-trapping-rain-water-ii
0695-max-area-of-island
1218-lowest-common-ancestor-of-deepest-leaves
2588-maximum-number-of-points-from-grid-queries
2793-count-the-number-of-complete-components
3863-power-grid-maintenance

Heap (Priority Queue)

0215-kth-largest-element-in-an-array
0253-meeting-rooms-ii
0272-closest-binary-search-tree-value-ii
0347-top-k-frequent-elements
0373-find-k-pairs-with-smallest-sums
0407-trapping-rain-water-ii
0621-task-scheduler
0683-k-empty-slots
0778-reorganize-string
1100-connecting-cities-with-minimum-cost
1478-maximum-number-of-events-that-can-be-attended
1917-maximum-average-pass-ratio
2023-design-movie-rental-system
2161-stock-price-fluctuation
2204-find-subsequence-of-length-k-with-the-largest-sum
2267-minimum-difference-in-sums-after-removal-of-elements
2429-design-a-food-rating-system
2479-meeting-rooms-iii
2588-maximum-number-of-points-from-grid-queries
2681-put-marbles-in-bags
2868-continuous-subarrays
2880-find-the-closest-marked-node
3445-lexicographically-minimum-string-after-removing-stars
3592-find-x-sum-of-all-k-long-subarrays-ii
3610-find-x-sum-of-all-k-long-subarrays-i
3627-find-minimum-time-to-reach-last-room-i
3628-find-minimum-time-to-reach-last-room-ii
3647-zero-array-transformation-iii
3678-design-task-manager
3863-power-grid-maintenance

Shortest Path

2090-number-of-ways-to-arrive-at-destination
2880-find-the-closest-marked-node
3627-find-minimum-time-to-reach-last-room-i
3628-find-minimum-time-to-reach-last-room-ii

Dynamic Programming

0042-trapping-rain-water
0055-jump-game
0118-pascals-triangle
0120-triangle
0124-binary-tree-maximum-path-sum
0333-largest-bst-subtree
0361-bomb-enemy
0368-largest-divisible-subset
0416-partition-equal-subset-sum
0474-ones-and-zeroes
0656-coin-path
0806-domino-and-tromino-tiling
0826-soup-servings
0867-new-21-game
0868-push-dominoes
0934-bitwise-ors-of-subarrays
1067-campus-bikes-ii
1134-shortest-distance-to-target-color
1262-greatest-sum-divisible-by-three
1352-maximum-profit-in-job-scheduling
1402-count-square-submatrices-with-all-ones
1586-longest-subarray-of-1s-after-deleting-one-element
1633-minimum-number-of-increments-on-subarrays-to-form-a-target-array
1700-minimum-time-to-make-rope-colorful
1851-maximum-number-of-events-that-can-be-attended-ii
1986-largest-color-value-in-a-directed-graph
2061-painting-a-grid-with-three-different-colors
2090-number-of-ways-to-arrive-at-destination
2118-maximum-earnings-from-taxi
2262-solving-questions-with-brainpower
2267-minimum-difference-in-sums-after-removal-of-elements
2395-longest-binary-subsequence-less-than-or-equal-to-k
2408-number-of-people-aware-of-a-secret
2415-count-the-number-of-ideal-arrays
2435-paths-in-matrix-whose-sum-is-divisible-by-k
2607-minimum-subarrays-in-a-valid-split
2882-ways-to-express-an-integer-as-sum-of-powers
3142-longest-unequal-adjacent-groups-subsequence-ii
3143-longest-unequal-adjacent-groups-subsequence-i
3243-count-the-number-of-powerful-integers
3307-find-the-maximum-sum-of-node-values
3490-find-the-maximum-length-of-valid-subsequence-i
3491-find-the-maximum-length-of-valid-subsequence-ii
3629-total-characters-in-string-after-transformations-i
3630-total-characters-in-string-after-transformations-ii
3637-count-number-of-balanced-permutations
3648-find-the-maximum-number-of-fruits-collected
3733-length-of-longest-v-shaped-diagonal-segment

Sorting

0015-3sum
0049-group-anagrams
0056-merge-intervals
0075-sort-colors
0215-kth-largest-element-in-an-array
0253-meeting-rooms-ii
0259-3sum-smaller
0314-binary-tree-vertical-order-traversal
0347-top-k-frequent-elements
0368-largest-divisible-subset
0527-word-abbreviation
0594-longest-harmonious-subsequence
0611-valid-triangle-number
0621-task-scheduler
0778-reorganize-string
0900-reordered-power-of-2
1098-largest-unique-number
1108-analyze-user-website-visit-pattern
1132-before-and-after-puzzle
1262-greatest-sum-divisible-by-three
1352-maximum-profit-in-job-scheduling
1478-maximum-number-of-events-that-can-be-attended
1483-rank-teams-by-votes
1621-number-of-subsequences-that-satisfy-the-given-sum-condition
1851-maximum-number-of-events-that-can-be-attended-ii
2118-maximum-earnings-from-taxi
2160-minimum-operations-to-make-a-uni-value-grid
2180-maximum-number-of-tasks-you-can-assign
2204-find-subsequence-of-length-k-with-the-largest-sum
2215-finding-3-digit-even-numbers
2274-keep-multiplying-found-values-by-two
2387-partition-array-such-that-maximum-difference-is-k
2479-meeting-rooms-iii
2497-maximum-matching-of-players-with-trainers
2588-maximum-number-of-points-from-grid-queries
2681-put-marbles-in-bags
2689-rearranging-fruits
2699-count-the-number-of-fair-pairs
2887-sort-vowels-in-a-string
2888-minimum-index-of-a-valid-split
3001-apply-operations-to-maximize-score
3241-divide-array-into-arrays-with-max-difference
3277-find-the-number-of-ways-to-place-people-ii
3278-find-the-number-of-ways-to-place-people-i
3307-find-the-maximum-sum-of-node-values
3321-type-of-triangle
3360-minimum-deletions-to-make-string-k-special
3430-count-days-without-meetings
3620-maximum-number-of-distinct-elements-after-operations
3622-maximum-frequency-of-an-element-after-performing-operations-i
3640-maximum-frequency-of-an-element-after-performing-operations-ii
3647-zero-array-transformation-iii
3657-check-if-grid-can-be-cut-into-sections
3748-sort-matrix-by-diagonals

Tree

0098-validate-binary-search-tree
0124-binary-tree-maximum-path-sum
0199-binary-tree-right-side-view
0255-verify-preorder-sequence-in-binary-search-tree
0272-closest-binary-search-tree-value-ii
0285-inorder-successor-in-bst
0314-binary-tree-vertical-order-traversal
0333-largest-bst-subtree
0543-diameter-of-binary-tree
0663-equal-tree-partition
0758-convert-binary-search-tree-to-sorted-doubly-linked-list
0975-range-sum-of-bst
1218-lowest-common-ancestor-of-deepest-leaves
1790-lowest-common-ancestor-of-a-binary-tree-iii
2400-minimum-score-after-removals-on-a-tree
2872-maximum-number-of-k-divisible-components
3307-find-the-maximum-sum-of-node-values

Binary Tree

0098-validate-binary-search-tree
0124-binary-tree-maximum-path-sum
0199-binary-tree-right-side-view
0255-verify-preorder-sequence-in-binary-search-tree
0272-closest-binary-search-tree-value-ii
0285-inorder-successor-in-bst
0314-binary-tree-vertical-order-traversal
0333-largest-bst-subtree
0543-diameter-of-binary-tree
0663-equal-tree-partition
0758-convert-binary-search-tree-to-sorted-doubly-linked-list
0975-range-sum-of-bst
1218-lowest-common-ancestor-of-deepest-leaves
1790-lowest-common-ancestor-of-a-binary-tree-iii

Matrix

0036-valid-sudoku
0054-spiral-matrix
0073-set-matrix-zeroes
0200-number-of-islands
0302-smallest-rectangle-enclosing-black-pixels
0311-sparse-matrix-multiplication
0317-shortest-distance-from-all-buildings
0361-bomb-enemy
0407-trapping-rain-water-ii
0498-diagonal-traverse
0695-max-area-of-island
1143-find-smallest-common-element-in-all-rows
1402-count-square-submatrices-with-all-ones
2160-minimum-operations-to-make-a-uni-value-grid
2244-number-of-laser-beams-in-a-bank
2435-paths-in-matrix-whose-sum-is-divisible-by-k
2588-maximum-number-of-points-from-grid-queries
2625-increment-submatrices-by-one
3461-find-the-minimum-area-to-cover-all-ones-i
3627-find-minimum-time-to-reach-last-room-i
3628-find-minimum-time-to-reach-last-room-ii
3648-find-the-maximum-number-of-fruits-collected
3733-length-of-longest-v-shaped-diagonal-segment
3748-sort-matrix-by-diagonals
3797-design-spreadsheet

Greedy

0055-jump-game
0253-meeting-rooms-ii
0527-word-abbreviation
0611-valid-triangle-number
0621-task-scheduler
0680-valid-palindrome-ii
0768-partition-labels
0778-reorganize-string
0797-rabbits-in-forest
1051-shortest-way-to-form-string
1262-greatest-sum-divisible-by-three
1448-maximum-69-number
1478-maximum-number-of-events-that-can-be-attended
1633-minimum-number-of-increments-on-subarrays-to-form-a-target-array
1700-minimum-time-to-make-rope-colorful
1834-minimum-number-of-people-to-teach
1917-maximum-average-pass-ratio
2140-longest-subsequence-repeated-k-times
2180-maximum-number-of-tasks-you-can-assign
2237-longest-palindrome-by-concatenating-two-letter-words
2387-partition-array-such-that-maximum-difference-is-k
2395-longest-binary-subsequence-less-than-or-equal-to-k
2487-optimal-partition-of-string
2497-maximum-matching-of-players-with-trainers
2661-smallest-missing-non-negative-integer-after-operations
2681-put-marbles-in-bags
2689-rearranging-fruits
2720-minimize-the-maximum-difference-of-pairs
3001-apply-operations-to-maximize-score
3143-longest-unequal-adjacent-groups-subsequence-i
3171-minimum-equal-sum-of-two-arrays-after-replacing-zeros
3241-divide-array-into-arrays-with-max-difference
3307-find-the-maximum-sum-of-node-values
3360-minimum-deletions-to-make-string-k-special
3445-lexicographically-minimum-string-after-removing-stars
3493-maximum-number-of-operations-to-move-ones-to-the-end
3620-maximum-number-of-distinct-elements-after-operations
3647-zero-array-transformation-iii
3741-reschedule-meetings-for-maximum-free-time-ii
3743-reschedule-meetings-for-maximum-free-time-i
3788-maximum-unique-subarray-sum-after-deletion
3834-minimum-operations-to-convert-all-elements-to-zero

Design

0146-lru-cache
0170-two-sum-iii-data-structure-design
0346-moving-average-from-data-stream
0353-design-snake-game
0359-logger-rate-limiter
1125-design-file-system
1366-first-unique-number
1713-dot-product-of-two-sparse-vectors
1995-finding-pairs-with-a-certain-sum
2023-design-movie-rental-system
2161-stock-price-fluctuation
2169-simple-bank-system
2429-design-a-food-rating-system
2555-design-sql
3678-design-task-manager
3797-design-spreadsheet
3827-implement-router

Data Stream

0170-two-sum-iii-data-structure-design
0346-moving-average-from-data-stream
0359-logger-rate-limiter
1366-first-unique-number
2161-stock-price-fluctuation

Stack

0042-trapping-rain-water
0255-verify-preorder-sequence-in-binary-search-tree
0272-closest-binary-search-tree-value-ii
0364-nested-list-weight-sum-ii
0758-convert-binary-search-tree-to-sorted-doubly-linked-list
1371-minimum-remove-to-make-valid-parentheses
1633-minimum-number-of-increments-on-subarrays-to-form-a-target-array
2307-replace-non-coprime-numbers-in-array
3001-apply-operations-to-maximize-score
3445-lexicographically-minimum-string-after-removing-stars
3834-minimum-operations-to-convert-all-elements-to-zero

Enumeration

0900-reordered-power-of-2
1656-count-good-triplets
1993-sum-of-all-subset-xor-totals
2140-longest-subsequence-repeated-k-times
2170-count-number-of-maximum-bitwise-or-subsets
2202-sum-of-k-mirror-numbers
2215-finding-3-digit-even-numbers
2837-minimum-operations-to-make-the-integer-zero
2998-count-symmetric-integers
3201-distribute-candies-among-children-ii
3277-find-the-number-of-ways-to-place-people-ii
3278-find-the-number-of-ways-to-place-people-i
3548-find-the-count-of-good-integers
3594-identify-the-largest-outlier-in-an-array
3683-find-the-lexicographically-largest-string-from-the-box-i
3741-reschedule-meetings-for-maximum-free-time-ii
3761-maximum-difference-between-even-and-odd-frequency-ii
3789-maximize-subarrays-after-removing-one-conflicting-pair

Ordered Set

0683-k-empty-slots
2023-design-movie-rental-system
2161-stock-price-fluctuation
2280-count-good-triplets-in-an-array
2429-design-a-food-rating-system
2868-continuous-subarrays
3678-design-task-manager
3790-fruits-into-baskets-ii
3791-fruits-into-baskets-iii
3827-implement-router
3863-power-grid-maintenance

Linked List

0146-lru-cache
0758-convert-binary-search-tree-to-sorted-doubly-linked-list
1411-convert-binary-number-in-a-linked-list-to-integer
1618-delete-n-nodes-after-m-nodes-of-a-linked-list

Doubly-Linked List

0146-lru-cache
0758-convert-binary-search-tree-to-sorted-doubly-linked-list

Divide and Conquer

0215-kth-largest-element-in-an-array
0347-top-k-frequent-elements
2280-count-good-triplets-in-an-array

Quickselect

0215-kth-largest-element-in-an-array
0347-top-k-frequent-elements

Monotonic Stack

0042-trapping-rain-water
0255-verify-preorder-sequence-in-binary-search-tree
1633-minimum-number-of-increments-on-subarrays-to-form-a-target-array
3001-apply-operations-to-maximize-score
3834-minimum-operations-to-convert-all-elements-to-zero

Backtracking

1067-campus-bikes-ii
1993-sum-of-all-subset-xor-totals
2140-longest-subsequence-repeated-k-times
2170-count-number-of-maximum-bitwise-or-subsets

Combinatorics

1993-sum-of-all-subset-xor-totals
2324-find-triangular-sum-of-an-array
2415-count-the-number-of-ideal-arrays
3201-distribute-candies-among-children-ii
3216-distribute-candies-among-children-iii
3548-find-the-count-of-good-integers
3637-count-number-of-balanced-permutations
3682-count-the-number-of-arrays-with-k-matching-adjacent-elements

Recursion

0231-power-of-two
0255-verify-preorder-sequence-in-binary-search-tree
0326-power-of-three
0342-power-of-four
2050-count-good-numbers
3600-find-the-k-th-character-in-string-game-i

Binary Indexed Tree

0683-k-empty-slots
2280-count-good-triplets-in-an-array

Segment Tree

0683-k-empty-slots
2280-count-good-triplets-in-an-array
3789-maximize-subarrays-after-removing-one-conflicting-pair
3790-fruits-into-baskets-ii
3791-fruits-into-baskets-iii

Merge Sort

2280-count-good-triplets-in-an-array

Monotonic Queue

0683-k-empty-slots
2180-maximum-number-of-tasks-you-can-assign
2527-count-subarrays-with-fixed-bounds
2868-continuous-subarrays

Binary Search Tree

0098-validate-binary-search-tree
0255-verify-preorder-sequence-in-binary-search-tree
0272-closest-binary-search-tree-value-ii
0285-inorder-successor-in-bst
0333-largest-bst-subtree
0758-convert-binary-search-tree-to-sorted-doubly-linked-list
0975-range-sum-of-bst

Memoization

1986-largest-color-value-in-a-directed-graph
2395-longest-binary-subsequence-less-than-or-equal-to-k
3733-length-of-longest-v-shaped-diagonal-segment

Trie

0386-lexicographical-numbers
0440-k-th-smallest-in-lexicographical-order
0527-word-abbreviation
1125-design-file-system

Brainteaser

2503-longest-subarray-with-maximum-bitwise-and
2837-minimum-operations-to-make-the-integer-zero
3462-vowels-game-in-a-string

Probability and Statistics

0826-soup-servings
0867-new-21-game

Bitmask

1067-campus-bikes-ii

Geometry

0830-largest-triangle-area
3277-find-the-number-of-ways-to-place-people-ii
3278-find-the-number-of-ways-to-place-people-i

Game Theory

3462-vowels-game-in-a-string

Minimum Spanning Tree

1100-connecting-cities-with-minimum-cost

Bucket Sort

0347-top-k-frequent-elements