leetcode

Collection of daily challenges and rest of em, thanks to leethub and its daddy

LeetCode Topics

String

0020-valid-parentheses
0038-count-and-say
0165-compare-version-numbers
0166-fraction-to-recurring-decimal
0474-ones-and-zeroes
0768-partition-labels
0868-push-dominoes
1006-vowel-spellchecker
1058-lexicographically-smallest-equivalent-string
1264-maximum-number-of-words-you-can-type
1302-delete-characters-to-make-fancy-string
1350-remove-sub-folders-from-the-filesystem
1353-find-resultant-array-after-removing-anagrams
1460-number-of-substrings-containing-all-three-characters
1636-number-of-substrings-with-only-1s
1700-minimum-time-to-make-rope-colorful
1747-lexicographically-smallest-string-after-applying-operations
1818-maximum-score-from-removing-substrings
2079-delete-duplicate-folders-in-system
2137-final-value-of-variable-after-performing-operations
2140-longest-subsequence-repeated-k-times
2147-number-of-ways-to-divide-a-long-corridor
2220-find-all-possible-recipes-from-given-supplies
2237-longest-palindrome-by-concatenating-two-letter-words
2260-divide-a-string-into-groups-of-size-k
2346-largest-3-same-digit-number-in-string
2395-longest-binary-subsequence-less-than-or-equal-to-k
2429-design-a-food-rating-system
2463-minimum-recolors-to-get-k-consecutive-black-blocks
2520-using-a-robot-to-print-the-lexicographically-smallest-string
2887-sort-vowels-in-a-string
3142-longest-unequal-adjacent-groups-subsequence-ii
3360-minimum-deletions-to-make-string-k-special
3396-valid-word
3445-lexicographically-minimum-string-after-removing-stars
3462-vowels-game-in-a-string
3569-count-of-substrings-containing-every-vowel-and-k-consonants-ii
3606-coupon-code-validator
3617-find-the-original-typed-string-i
3618-find-the-original-typed-string-ii
3630-total-characters-in-string-after-transformations-ii
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
3768-check-if-digits-are-equal-in-string-after-operations-i
3797-design-spreadsheet
3872-find-most-frequent-vowel-and-consonant

Stack

0020-valid-parentheses
0937-online-stock-span
1628-count-submatrices-with-all-ones
1633-minimum-number-of-increments-on-subarrays-to-form-a-target-array
1818-maximum-score-from-removing-substrings
2307-replace-non-coprime-numbers-in-array
2520-using-a-robot-to-print-the-lexicographically-smallest-string
3001-apply-operations-to-maximize-score
3445-lexicographically-minimum-string-after-removing-stars

Math

0007-reverse-integer
0166-fraction-to-recurring-decimal
0231-power-of-two
0326-power-of-three
0342-power-of-four
0368-largest-divisible-subset
0553-optimal-division
0679-24-game
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
1018-largest-perimeter-triangle
1411-convert-binary-number-in-a-linked-list-to-integer
1421-find-numbers-with-even-number-of-digits
1426-find-n-unique-integers-sum-up-to-zero
1448-maximum-69-number
1500-count-largest-group
1523-count-odd-numbers-in-an-interval-range
1529-max-difference-you-can-get-from-changing-an-integer
1636-number-of-substrings-with-only-1s
1642-water-bottles
1925-count-square-sum-triples
1993-sum-of-all-subset-xor-totals
2050-count-good-numbers
2147-number-of-ways-to-divide-a-long-corridor
2160-minimum-operations-to-make-a-uni-value-grid
2174-next-greater-numerically-balanced-number
2202-sum-of-k-mirror-numbers
2307-replace-non-coprime-numbers-in-array
2415-count-the-number-of-ideal-arrays
2432-number-of-zero-filled-subarrays
2610-closest-prime-numbers-in-range
2661-smallest-missing-non-negative-integer-after-operations
2704-maximum-difference-by-remapping-a-digit
2998-count-symmetric-integers
3001-apply-operations-to-maximize-score
3172-divisible-and-non-divisible-sums-difference
3190-find-minimum-operations-to-make-all-elements-divisible-by-three
3201-distribute-candies-among-children-ii
3278-find-the-number-of-ways-to-place-people-i
3279-alice-and-bob-playing-flower-game
3336-water-bottles-ii
3433-count-mentions-per-user
3462-vowels-game-in-a-string
3512-minimum-operations-to-make-array-sum-divisible-by-k
3548-find-the-count-of-good-integers
3577-count-the-number-of-computer-unlocking-permutations
3600-find-the-k-th-character-in-string-game-i
3601-find-the-k-th-character-in-string-game-ii
3623-count-number-of-trapezoids-i
3625-count-number-of-trapezoids-ii
3630-total-characters-in-string-after-transformations-ii
3682-count-the-number-of-arrays-with-k-matching-adjacent-elements
3744-minimum-operations-to-make-array-elements-zero
3754-maximum-manhattan-distance-after-k-changes
3768-check-if-digits-are-equal-in-string-after-operations-i
3830-find-closest-person

Number Theory

2307-replace-non-coprime-numbers-in-array
2415-count-the-number-of-ideal-arrays
2610-closest-prime-numbers-in-range
3001-apply-operations-to-maximize-score
3768-check-if-digits-are-equal-in-string-after-operations-i

Array

0011-container-with-most-water
0018-4sum
0036-valid-sudoku
0037-sudoku-solver
0073-set-matrix-zeroes
0075-sort-colors
0135-candy
0136-single-number
0368-largest-divisible-subset
0407-trapping-rain-water-ii
0416-partition-equal-subset-sum
0417-pacific-atlantic-water-flow
0474-ones-and-zeroes
0498-diagonal-traverse
0553-optimal-division
0594-longest-harmonious-subsequence
0611-valid-triangle-number
0679-24-game
0717-1-bit-and-2-bit-characters
0759-set-intersection-size-at-least-two
0794-swim-in-rising-water
0797-rabbits-in-forest
0830-largest-triangle-area
0940-fruit-into-baskets
0945-snakes-and-ladders
1006-vowel-spellchecker
1018-largest-perimeter-triangle
1018-binary-prefix-divisible-by-5
1049-minimum-domino-rotations-for-equal-row
1111-minimum-score-triangulation-of-polygon
1227-number-of-equivalent-domino-pairs
1293-three-consecutive-odds
1335-maximum-candies-allocated-to-k-children
1350-remove-sub-folders-from-the-filesystem
1353-find-resultant-array-after-removing-anagrams
1402-count-square-submatrices-with-all-ones
1421-find-numbers-with-even-number-of-digits
1424-maximum-candies-you-can-get-from-boxes
1426-find-n-unique-integers-sum-up-to-zero
1478-maximum-number-of-events-that-can-be-attended
1510-find-lucky-integer-in-an-array
1586-longest-subarray-of-1s-after-deleting-one-element
1590-make-sum-divisible-by-p
1612-avoid-flood-in-the-city
1621-number-of-subsequences-that-satisfy-the-given-sum-condition
1628-count-submatrices-with-all-ones
1633-minimum-number-of-increments-on-subarrays-to-form-a-target-array
1656-count-good-triplets
1700-minimum-time-to-make-rope-colorful
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
2079-delete-duplicate-folders-in-system
2137-final-value-of-variable-after-performing-operations
2141-maximum-running-time-of-n-computers
2144-maximum-difference-between-increasing-elements
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
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
2249-count-the-hidden-sequences
2262-solving-questions-with-brainpower
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
2320-find-all-k-distant-indices-in-an-array
2331-intersection-of-multiple-arrays
2343-count-unguarded-cells-in-the-grid
2387-partition-array-such-that-maximum-difference-is-k
2392-successful-pairs-of-spells-and-potions
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
2478-longest-nice-subarray
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
2588-maximum-number-of-points-from-grid-queries
2614-maximum-count-of-positive-integer-and-negative-integer
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
2720-minimize-the-maximum-difference-of-pairs
2856-count-complete-subarrays-in-an-array
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
3152-maximum-value-of-an-ordered-triplet-ii
3154-maximum-value-of-an-ordered-triplet-i
3190-find-minimum-operations-to-make-all-elements-divisible-by-three
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
3278-find-the-number-of-ways-to-place-people-i
3307-find-the-maximum-sum-of-node-values
3348-minimum-cost-walk-in-weighted-graph
3381-maximum-subarray-sum-with-length-divisible-by-k
3383-taking-maximum-energy-from-the-mystic-dungeon
3430-count-days-without-meetings
3433-count-mentions-per-user
3437-maximum-total-damage-with-spell-casting
3459-find-the-minimum-area-to-cover-all-ones-ii
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
3501-delete-nodes-from-linked-list-present-in-array
3512-minimum-operations-to-make-array-sum-divisible-by-k
3531-count-covered-buildings
3573-best-time-to-buy-and-sell-stock-v
3577-count-the-number-of-computer-unlocking-permutations
3583-count-special-triplets
3606-coupon-code-validator
3610-find-x-sum-of-all-k-long-subarrays-i
3612-adjacent-increasing-subarrays-detection-i
3616-make-array-elements-equal-to-zero
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
3623-count-number-of-trapezoids-i
3625-count-number-of-trapezoids-ii
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
3723-sum-of-good-numbers
3733-length-of-longest-v-shaped-diagonal-segment
3741-reschedule-meetings-for-maximum-free-time-ii
3743-reschedule-meetings-for-maximum-free-time-i
3744-minimum-operations-to-make-array-elements-zero
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
3863-power-grid-maintenance

Dynamic Programming

0368-largest-divisible-subset
0416-partition-equal-subset-sum
0474-ones-and-zeroes
0553-optimal-division
0806-domino-and-tromino-tiling
0826-soup-servings
0867-new-21-game
0868-push-dominoes
1111-minimum-score-triangulation-of-polygon
1402-count-square-submatrices-with-all-ones
1586-longest-subarray-of-1s-after-deleting-one-element
1628-count-submatrices-with-all-ones
1633-minimum-number-of-increments-on-subarrays-to-form-a-target-array
1700-minimum-time-to-make-rope-colorful
1732-minimum-one-bit-operations-to-make-integers-zero
1851-maximum-number-of-events-that-can-be-attended-ii
2028-the-earliest-and-latest-rounds-where-players-compete
2061-painting-a-grid-with-three-different-colors
2090-number-of-ways-to-arrive-at-destination
2147-number-of-ways-to-divide-a-long-corridor
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
2882-ways-to-express-an-integer-as-sum-of-powers
3142-longest-unequal-adjacent-groups-subsequence-ii
3307-find-the-maximum-sum-of-node-values
3437-maximum-total-damage-with-spell-casting
3490-find-the-maximum-length-of-valid-subsequence-i
3491-find-the-maximum-length-of-valid-subsequence-ii
3573-best-time-to-buy-and-sell-stock-v
3618-find-the-original-typed-string-ii
3630-total-characters-in-string-after-transformations-ii
3648-find-the-maximum-number-of-fruits-collected
3733-length-of-longest-v-shaped-diagonal-segment

Sliding Window

0594-longest-harmonious-subsequence
0867-new-21-game
0940-fruit-into-baskets
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
2463-minimum-recolors-to-get-k-consecutive-black-blocks
2478-longest-nice-subarray
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
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
3569-count-of-substrings-containing-every-vowel-and-k-consonants-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

Hash Table

0036-valid-sudoku
0037-sudoku-solver
0073-set-matrix-zeroes
0166-fraction-to-recurring-decimal
0594-longest-harmonious-subsequence
0768-partition-labels
0797-rabbits-in-forest
0900-reordered-power-of-2
0940-fruit-into-baskets
1006-vowel-spellchecker
1015-smallest-integer-divisible-by-k
1218-lowest-common-ancestor-of-deepest-leaves
1227-number-of-equivalent-domino-pairs
1264-maximum-number-of-words-you-can-type
1353-find-resultant-array-after-removing-anagrams
1460-number-of-substrings-containing-all-three-characters
1500-count-largest-group
1510-find-lucky-integer-in-an-array
1590-make-sum-divisible-by-p
1612-avoid-flood-in-the-city
1813-maximum-erasure-value
1834-minimum-number-of-people-to-teach
1995-finding-pairs-with-a-certain-sum
2023-design-movie-rental-system
2079-delete-duplicate-folders-in-system
2169-simple-bank-system
2174-next-greater-numerically-balanced-number
2204-find-subsequence-of-length-k-with-the-largest-sum
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
2331-intersection-of-multiple-arrays
2429-design-a-food-rating-system
2479-meeting-rooms-iii
2520-using-a-robot-to-print-the-lexicographically-smallest-string
2626-count-the-number-of-good-subarrays
2661-smallest-missing-non-negative-integer-after-operations
2689-rearranging-fruits
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
3437-maximum-total-damage-with-spell-casting
3445-lexicographically-minimum-string-after-removing-stars
3501-delete-nodes-from-linked-list-present-in-array
3531-count-covered-buildings
3548-find-the-count-of-good-integers
3569-count-of-substrings-containing-every-vowel-and-k-consonants-ii
3583-count-special-triplets
3606-coupon-code-validator
3610-find-x-sum-of-all-k-long-subarrays-i
3621-minimum-operations-to-make-array-values-equal-to-k
3623-count-number-of-trapezoids-i
3625-count-number-of-trapezoids-ii
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
3863-power-grid-maintenance
3872-find-most-frequent-vowel-and-consonant

Binary Search

0611-valid-triangle-number
0794-swim-in-rising-water
1335-maximum-candies-allocated-to-k-children
1612-avoid-flood-in-the-city
1621-number-of-subsequences-that-satisfy-the-given-sum-condition
1851-maximum-number-of-events-that-can-be-attended-ii
2141-maximum-running-time-of-n-computers
2180-maximum-number-of-tasks-you-can-assign
2229-maximum-fruits-harvested-after-at-most-k-steps
2280-count-good-triplets-in-an-array
2392-successful-pairs-of-spells-and-potions
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
3437-maximum-total-damage-with-spell-casting
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

Counting

0594-longest-harmonious-subsequence
0900-reordered-power-of-2
1227-number-of-equivalent-domino-pairs
1510-find-lucky-integer-in-an-array
2140-longest-subsequence-repeated-k-times
2174-next-greater-numerically-balanced-number
2237-longest-palindrome-by-concatenating-two-letter-words
2308-divide-array-into-equal-pairs
2331-intersection-of-multiple-arrays
2614-maximum-count-of-positive-integer-and-negative-integer
3242-count-elements-with-maximum-frequency
3360-minimum-deletions-to-make-string-k-special
3437-maximum-total-damage-with-spell-casting
3583-count-special-triplets
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

Prefix Sum

1590-make-sum-divisible-by-p
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
2915-count-of-interesting-subarrays
3381-maximum-subarray-sum-with-length-divisible-by-k
3383-taking-maximum-energy-from-the-mystic-dungeon
3475-minimum-operations-to-make-binary-array-elements-equal-to-one-i
3616-make-array-elements-equal-to-zero
3618-find-the-original-typed-string-ii
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

Bit Manipulation

0136-single-number
0231-power-of-two
0342-power-of-four
1018-binary-prefix-divisible-by-5
1732-minimum-one-bit-operations-to-make-integers-zero
1993-sum-of-all-subset-xor-totals
2170-count-number-of-maximum-bitwise-or-subsets
2308-divide-array-into-equal-pairs
2400-minimum-score-after-removals-on-a-tree
2478-longest-nice-subarray
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
3601-find-the-k-th-character-in-string-game-ii
3744-minimum-operations-to-make-array-elements-zero

Queue

2180-maximum-number-of-tasks-you-can-assign
2408-number-of-people-aware-of-a-secret
2527-count-subarrays-with-fixed-bounds
3475-minimum-operations-to-make-binary-array-elements-equal-to-one-i
3827-implement-router

Union Find

0794-swim-in-rising-water
1058-lexicographically-smallest-equivalent-string
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

1424-maximum-candies-you-can-get-from-boxes
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
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

2090-number-of-ways-to-arrive-at-destination
2220-find-all-possible-recipes-from-given-supplies

Depth-First Search

0386-lexicographical-numbers
0417-pacific-atlantic-water-flow
0794-swim-in-rising-water
1218-lowest-common-ancestor-of-deepest-leaves
1350-remove-sub-folders-from-the-filesystem
1747-lexicographically-smallest-string-after-applying-operations
2400-minimum-score-after-removals-on-a-tree
2438-find-closest-node-to-given-two-nodes
2793-count-the-number-of-complete-components
2872-maximum-number-of-k-divisible-components
3633-maximize-the-number-of-target-nodes-after-connecting-trees-i
3645-maximize-the-number-of-target-nodes-after-connecting-trees-ii
3863-power-grid-maintenance

Breadth-First Search

0407-trapping-rain-water-ii
0417-pacific-atlantic-water-flow
0794-swim-in-rising-water
0945-snakes-and-ladders
1218-lowest-common-ancestor-of-deepest-leaves
1424-maximum-candies-you-can-get-from-boxes
1747-lexicographically-smallest-string-after-applying-operations
2588-maximum-number-of-points-from-grid-queries
2793-count-the-number-of-complete-components
3633-maximize-the-number-of-target-nodes-after-connecting-trees-i
3645-maximize-the-number-of-target-nodes-after-connecting-trees-ii
3863-power-grid-maintenance

Shortest Path

2090-number-of-ways-to-arrive-at-destination
3627-find-minimum-time-to-reach-last-room-i
3628-find-minimum-time-to-reach-last-room-ii

Sorting

0018-4sum
0075-sort-colors
0368-largest-divisible-subset
0594-longest-harmonious-subsequence
0611-valid-triangle-number
0759-set-intersection-size-at-least-two
0900-reordered-power-of-2
1018-largest-perimeter-triangle
1353-find-resultant-array-after-removing-anagrams
1478-maximum-number-of-events-that-can-be-attended
1621-number-of-subsequences-that-satisfy-the-given-sum-condition
1851-maximum-number-of-events-that-can-be-attended-ii
2141-maximum-running-time-of-n-computers
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
2274-keep-multiplying-found-values-by-two
2331-intersection-of-multiple-arrays
2387-partition-array-such-that-maximum-difference-is-k
2392-successful-pairs-of-spells-and-potions
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
3278-find-the-number-of-ways-to-place-people-i
3307-find-the-maximum-sum-of-node-values
3360-minimum-deletions-to-make-string-k-special
3430-count-days-without-meetings
3433-count-mentions-per-user
3437-maximum-total-damage-with-spell-casting
3531-count-covered-buildings
3606-coupon-code-validator
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

Matrix

0036-valid-sudoku
0037-sudoku-solver
0073-set-matrix-zeroes
0407-trapping-rain-water-ii
0417-pacific-atlantic-water-flow
0498-diagonal-traverse
0794-swim-in-rising-water
0945-snakes-and-ladders
1402-count-square-submatrices-with-all-ones
1628-count-submatrices-with-all-ones
2160-minimum-operations-to-make-a-uni-value-grid
2343-count-unguarded-cells-in-the-grid
2588-maximum-number-of-points-from-grid-queries
3459-find-the-minimum-area-to-cover-all-ones-ii
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

Two Pointers

0011-container-with-most-water
0018-4sum
0075-sort-colors
0165-compare-version-numbers
0611-valid-triangle-number
0768-partition-labels
0868-push-dominoes
1621-number-of-subsequences-that-satisfy-the-given-sum-condition
2320-find-all-k-distant-indices-in-an-array
2392-successful-pairs-of-spells-and-potions
2497-maximum-matching-of-players-with-trainers
2588-maximum-number-of-points-from-grid-queries
2699-count-the-number-of-fair-pairs
3437-maximum-total-damage-with-spell-casting
3683-find-the-lexicographically-largest-string-from-the-box-i

Heap (Priority Queue)

0407-trapping-rain-water-ii
0794-swim-in-rising-water
1478-maximum-number-of-events-that-can-be-attended
1612-avoid-flood-in-the-city
1917-maximum-average-pass-ratio
2023-design-movie-rental-system
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
3445-lexicographically-minimum-string-after-removing-stars
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

Greedy

0011-container-with-most-water
0135-candy
0611-valid-triangle-number
0759-set-intersection-size-at-least-two
0768-partition-labels
0797-rabbits-in-forest
1018-largest-perimeter-triangle
1049-minimum-domino-rotations-for-equal-row
1448-maximum-69-number
1478-maximum-number-of-events-that-can-be-attended
1529-max-difference-you-can-get-from-changing-an-integer
1612-avoid-flood-in-the-city
1633-minimum-number-of-increments-on-subarrays-to-form-a-target-array
1700-minimum-time-to-make-rope-colorful
1818-maximum-score-from-removing-substrings
1834-minimum-number-of-people-to-teach
1917-maximum-average-pass-ratio
2140-longest-subsequence-repeated-k-times
2141-maximum-running-time-of-n-computers
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
2497-maximum-matching-of-players-with-trainers
2520-using-a-robot-to-print-the-lexicographically-smallest-string
2661-smallest-missing-non-negative-integer-after-operations
2681-put-marbles-in-bags
2689-rearranging-fruits
2704-maximum-difference-by-remapping-a-digit
2720-minimize-the-maximum-difference-of-pairs
3001-apply-operations-to-maximize-score
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
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

Monotonic Stack

0937-online-stock-span
1628-count-submatrices-with-all-ones
1633-minimum-number-of-increments-on-subarrays-to-form-a-target-array
3001-apply-operations-to-maximize-score

Tree

1218-lowest-common-ancestor-of-deepest-leaves
2400-minimum-score-after-removals-on-a-tree
2872-maximum-number-of-k-divisible-components
3307-find-the-maximum-sum-of-node-values
3633-maximize-the-number-of-target-nodes-after-connecting-trees-i
3645-maximize-the-number-of-target-nodes-after-connecting-trees-ii

Binary Tree

1218-lowest-common-ancestor-of-deepest-leaves

Backtracking

0037-sudoku-solver
0679-24-game
1993-sum-of-all-subset-xor-totals
2140-longest-subsequence-repeated-k-times
2170-count-number-of-maximum-bitwise-or-subsets
2174-next-greater-numerically-balanced-number

Combinatorics

1993-sum-of-all-subset-xor-totals
2415-count-the-number-of-ideal-arrays
3201-distribute-candies-among-children-ii
3548-find-the-count-of-good-integers
3577-count-the-number-of-computer-unlocking-permutations
3682-count-the-number-of-arrays-with-k-matching-adjacent-elements
3768-check-if-digits-are-equal-in-string-after-operations-i

Enumeration

0900-reordered-power-of-2
1656-count-good-triplets
1747-lexicographically-smallest-string-after-applying-operations
1925-count-square-sum-triples
1993-sum-of-all-subset-xor-totals
2140-longest-subsequence-repeated-k-times
2170-count-number-of-maximum-bitwise-or-subsets
2174-next-greater-numerically-balanced-number
2202-sum-of-k-mirror-numbers
2837-minimum-operations-to-make-the-integer-zero
2998-count-symmetric-integers
3201-distribute-candies-among-children-ii
3278-find-the-number-of-ways-to-place-people-i
3459-find-the-minimum-area-to-cover-all-ones-ii
3548-find-the-count-of-good-integers
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

Recursion

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
3601-find-the-k-th-character-in-string-game-ii

Divide and Conquer

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

Binary Indexed Tree

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

Segment Tree

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

Ordered Set

2023-design-movie-rental-system
2280-count-good-triplets-in-an-array
2429-design-a-food-rating-system
3678-design-task-manager
3790-fruits-into-baskets-ii
3791-fruits-into-baskets-iii
3827-implement-router
3863-power-grid-maintenance

Monotonic Queue

2180-maximum-number-of-tasks-you-can-assign
2527-count-subarrays-with-fixed-bounds

Design

0937-online-stock-span
1995-finding-pairs-with-a-certain-sum
2023-design-movie-rental-system
2169-simple-bank-system
2429-design-a-food-rating-system
3678-design-task-manager
3797-design-spreadsheet
3827-implement-router

Data Stream

0937-online-stock-span

Trie

0386-lexicographical-numbers
0440-k-th-smallest-in-lexicographical-order
1350-remove-sub-folders-from-the-filesystem
2079-delete-duplicate-folders-in-system

Simulation

0498-diagonal-traverse
1642-water-bottles
2137-final-value-of-variable-after-performing-operations
2169-simple-bank-system
2260-divide-a-string-into-groups-of-size-k
2274-keep-multiplying-found-values-by-two
2343-count-unguarded-cells-in-the-grid
2408-number-of-people-aware-of-a-secret
2479-meeting-rooms-iii
3336-water-bottles-ii
3433-count-mentions-per-user
3600-find-the-k-th-character-in-string-game-i
3616-make-array-elements-equal-to-zero
3768-check-if-digits-are-equal-in-string-after-operations-i
3790-fruits-into-baskets-ii

Memoization

1732-minimum-one-bit-operations-to-make-integers-zero
2028-the-earliest-and-latest-rounds-where-players-compete
2395-longest-binary-subsequence-less-than-or-equal-to-k
3733-length-of-longest-v-shaped-diagonal-segment

Linked List

1411-convert-binary-number-in-a-linked-list-to-integer
3501-delete-nodes-from-linked-list-present-in-array

Hash Function

2079-delete-duplicate-folders-in-system

Brainteaser

2503-longest-subarray-with-maximum-bitwise-and
2837-minimum-operations-to-make-the-integer-zero
3462-vowels-game-in-a-string
3577-count-the-number-of-computer-unlocking-permutations

Probability and Statistics

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

Geometry

0830-largest-triangle-area
3278-find-the-number-of-ways-to-place-people-i
3623-count-number-of-trapezoids-i
3625-count-number-of-trapezoids-ii

Game Theory

3462-vowels-game-in-a-string