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

LeetCode Topics

String

0003-longest-substring-without-repeating-characters
0008-string-to-integer-atoi
0010-regular-expression-matching
0028-find-the-index-of-the-first-occurrence-in-a-string
0032-longest-valid-parentheses
0038-count-and-say
0043-multiply-strings
0049-group-anagrams
0072-edit-distance
0076-minimum-window-substring
0087-scramble-string
0091-decode-ways
0131-palindrome-partitioning
0187-repeated-dna-sequences
0205-isomorphic-strings
0208-implement-trie-prefix-tree
0242-valid-anagram
0257-binary-tree-paths
0344-reverse-string
0383-ransom-note
0387-first-unique-character-in-a-string
0392-is-subsequence
0394-decode-string
0399-evaluate-division
0424-longest-repeating-character-replacement
0438-find-all-anagrams-in-a-string
0449-serialize-and-deserialize-bst
0451-sort-characters-by-frequency
0459-repeated-substring-pattern
0567-permutation-in-string
0583-delete-operation-for-two-strings
0606-construct-string-from-binary-tree
0647-palindromic-substrings
0678-valid-parenthesis-string
0753-open-the-lock
0768-partition-labels
0926-find-and-replace-pattern
1122-longest-duplicate-substring
1250-longest-common-subsequence
1302-delete-characters-to-make-fancy-string
1437-minimum-insertion-steps-to-make-a-string-palindrome
1516-the-k-th-lexicographical-string-of-all-happy-strings-of-length-n
1818-maximum-score-from-removing-substrings
1890-sum-of-beauty-of-all-substrings
2032-largest-odd-number-in-string
2079-delete-duplicate-folders-in-system
2140-longest-subsequence-repeated-k-times
2220-find-all-possible-recipes-from-given-supplies
2260-divide-a-string-into-groups-of-size-k
2337-remove-digit-from-number-to-maximize-result
2346-largest-3-same-digit-number-in-string
2395-longest-binary-subsequence-less-than-or-equal-to-k
2520-using-a-robot-to-print-the-lexicographically-smallest-string
2819-remove-trailing-zeros-from-a-string
3142-longest-unequal-adjacent-groups-subsequence-ii
3143-longest-unequal-adjacent-groups-subsequence-i
3194-find-words-containing-character
3245-find-beautiful-indices-in-the-given-array-i
3360-minimum-deletions-to-make-string-k-special
3396-valid-word
3445-lexicographically-minimum-string-after-removing-stars
3617-find-the-original-typed-string-i
3618-find-the-original-typed-string-ii
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
3871-minimum-deletions-for-at-most-k-distinct-characters

Array

0001-two-sum
0015-3sum
0016-3sum-closest
0018-4sum
0026-remove-duplicates-from-sorted-array
0027-remove-element
0033-search-in-rotated-sorted-array
0034-find-first-and-last-position-of-element-in-sorted-array
0035-search-insert-position
0045-jump-game-ii
0049-group-anagrams
0053-maximum-subarray
0054-spiral-matrix
0055-jump-game
0057-insert-interval
0064-minimum-path-sum
0073-set-matrix-zeroes
0074-search-a-2d-matrix
0075-sort-colors
0080-remove-duplicates-from-sorted-array-ii
0081-search-in-rotated-sorted-array-ii
0088-merge-sorted-array
0105-construct-binary-tree-from-preorder-and-inorder-traversal
0106-construct-binary-tree-from-inorder-and-postorder-traversal
0108-convert-sorted-array-to-binary-search-tree
0118-pascals-triangle
0121-best-time-to-buy-and-sell-stock
0122-best-time-to-buy-and-sell-stock-ii
0123-best-time-to-buy-and-sell-stock-iii
0128-longest-consecutive-sequence
0130-surrounded-regions
0135-candy
0152-maximum-product-subarray
0153-find-minimum-in-rotated-sorted-array
0167-two-sum-ii-input-array-is-sorted
0198-house-robber
0200-number-of-islands
0209-minimum-size-subarray-sum
0213-house-robber-ii
0217-contains-duplicate
0219-contains-duplicate-ii
0239-sliding-window-maximum
0240-search-a-2d-matrix-ii
0260-single-number-iii
0283-move-zeroes
0289-game-of-life
0300-longest-increasing-subsequence
0303-range-sum-query-immutable
0304-range-sum-query-2d-immutable
0315-count-of-smaller-numbers-after-self
0322-coin-change
0329-longest-increasing-path-in-a-matrix
0330-patching-array
0347-top-k-frequent-elements
0349-intersection-of-two-arrays
0350-intersection-of-two-arrays-ii
0363-max-sum-of-rectangle-no-larger-than-k
0368-largest-divisible-subset
0378-kth-smallest-element-in-a-sorted-matrix
0399-evaluate-division
0403-frog-jump
0406-queue-reconstruction-by-height
0410-split-array-largest-sum
0416-partition-equal-subset-sum
0417-pacific-atlantic-water-flow
0419-battleships-in-a-board
0435-non-overlapping-intervals
0452-minimum-number-of-arrows-to-burst-balloons
0454-4sum-ii
0456-132-pattern
0475-heaters
0494-target-sum
0498-diagonal-traverse
0525-contiguous-array
0542-01-matrix
0560-subarray-sum-equals-k
0594-longest-harmonious-subsequence
0598-range-addition-ii
0621-task-scheduler
0643-maximum-average-subarray-i
0646-maximum-length-of-pair-chain
0674-longest-continuous-increasing-subsequence
0695-max-area-of-island
0698-partition-to-k-equal-sum-subsets
0719-find-k-th-smallest-pair-distance
0733-flood-fill
0740-delete-and-earn
0741-cherry-pickup
0747-min-cost-climbing-stairs
0753-open-the-lock
0792-binary-search
0794-swim-in-rising-water
0797-rabbits-in-forest
0825-max-increase-to-keep-city-skyline
0833-bus-routes
0860-design-circular-queue
0890-lemonade-change
0892-shortest-subarray-with-sum-at-least-k
0902-minimum-number-of-refueling-stops
0907-koko-eating-bananas
0914-random-point-in-non-overlapping-rectangles
0926-find-and-replace-pattern
0934-bitwise-ors-of-subarrays
0936-rle-iterator
0940-fruit-into-baskets
0945-snakes-and-ladders
0954-maximum-sum-circular-subarray
0964-minimize-malware-spread-ii
0966-binary-subarrays-with-sum
0983-validate-stack-sequences
1014-k-closest-points-to-origin
1016-subarray-sums-divisible-by-k
1019-squares-of-a-sorted-array
1025-minimum-cost-for-tickets
1034-subarrays-with-k-different-integers
1036-rotting-oranges
1056-capacity-to-ship-packages-within-d-days
1081-video-stitching
1171-shortest-path-in-binary-matrix
1184-car-pooling
1196-filling-bookcase-shelves
1242-matrix-block-sum
1249-snapshot-array
1293-three-consecutive-odds
1367-maximum-height-by-stacking-cuboids
1402-count-square-submatrices-with-all-ones
1408-find-the-smallest-divisor-given-a-threshold
1424-maximum-candies-you-can-get-from-boxes
1451-minimum-number-of-taps-to-open-to-water-a-garden
1478-maximum-number-of-events-that-can-be-attended
1510-find-lucky-integer-in-an-array
1522-stone-game-iii
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
1635-number-of-good-pairs
1656-count-good-triplets
1675-magnetic-force-between-two-balls
1706-min-cost-to-connect-all-points
1813-maximum-erasure-value
1815-checking-existence-of-edge-length-limited-paths
1829-maximum-units-on-a-truck
1851-maximum-number-of-events-that-can-be-attended-ii
1888-find-nearest-point-that-has-the-same-x-or-y-coordinate
1962-single-threaded-cpu
1989-minimum-xor-sum-of-two-arrays
1993-sum-of-all-subset-xor-totals
1995-finding-pairs-with-a-certain-sum
2047-find-a-peak-element-ii
2048-build-array-from-permutation
2079-delete-duplicate-folders-in-system
2094-remove-stones-to-minimize-the-total
2144-maximum-difference-between-increasing-elements
2150-kth-smallest-product-of-two-sorted-arrays
2160-minimum-operations-to-make-a-uni-value-grid
2204-find-subsequence-of-length-k-with-the-largest-sum
2206-detonate-the-maximum-bombs
2220-find-all-possible-recipes-from-given-supplies
2229-maximum-fruits-harvested-after-at-most-k-steps
2262-solving-questions-with-brainpower
2267-minimum-difference-in-sums-after-removal-of-elements
2277-count-equal-and-divisible-pairs-in-an-array
2316-count-hills-and-valleys-in-an-array
2320-find-all-k-distant-indices-in-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
2432-number-of-zero-filled-subarrays
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
2626-count-the-number-of-good-subarrays
2656-count-the-number-of-beautiful-subarrays
2689-rearranging-fruits
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
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
3194-find-words-containing-character
3213-count-subarrays-where-max-element-appears-at-least-k-times
3241-divide-array-into-arrays-with-max-difference
3307-find-the-maximum-sum-of-node-values
3321-type-of-triangle
3348-minimum-cost-walk-in-weighted-graph
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
3490-find-the-maximum-length-of-valid-subsequence-i
3491-find-the-maximum-length-of-valid-subsequence-ii
3621-minimum-operations-to-make-array-values-equal-to-k
3639-zero-array-transformation-i
3647-zero-array-transformation-iii
3648-find-the-maximum-number-of-fruits-collected
3685-count-subarrays-of-length-three-with-a-condition
3733-length-of-longest-v-shaped-diagonal-segment
3743-reschedule-meetings-for-maximum-free-time-i
3747-maximum-difference-between-adjacent-elements-in-a-circular-array
3789-maximize-subarrays-after-removing-one-conflicting-pair
3790-fruits-into-baskets-ii
3791-fruits-into-baskets-iii
3809-properties-graph
3834-minimum-operations-to-convert-all-elements-to-zero

Bit Manipulation

0187-repeated-dna-sequences
0222-count-complete-tree-nodes
0231-power-of-two
0260-single-number-iii
0698-partition-to-k-equal-sum-subsets
0934-bitwise-ors-of-subarrays
1989-minimum-xor-sum-of-two-arrays
1993-sum-of-all-subset-xor-totals
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
2656-count-the-number-of-beautiful-subarrays
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

Queue

0239-sliding-window-maximum
0387-first-unique-character-in-a-string
0860-design-circular-queue
0892-shortest-subarray-with-sum-at-least-k
0954-maximum-sum-circular-subarray
2527-count-subarrays-with-fixed-bounds
3475-minimum-operations-to-make-binary-array-elements-equal-to-one-i

Sliding Window

0003-longest-substring-without-repeating-characters
0076-minimum-window-substring
0187-repeated-dna-sequences
0209-minimum-size-subarray-sum
0219-contains-duplicate-ii
0239-sliding-window-maximum
0424-longest-repeating-character-replacement
0438-find-all-anagrams-in-a-string
0567-permutation-in-string
0594-longest-harmonious-subsequence
0643-maximum-average-subarray-i
0867-new-21-game
0892-shortest-subarray-with-sum-at-least-k
0940-fruit-into-baskets
0966-binary-subarrays-with-sum
1034-subarrays-with-k-different-integers
1122-longest-duplicate-substring
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
3213-count-subarrays-where-max-element-appears-at-least-k-times
3475-minimum-operations-to-make-binary-array-elements-equal-to-one-i
3743-reschedule-meetings-for-maximum-free-time-i

Prefix Sum

0209-minimum-size-subarray-sum
0303-range-sum-query-immutable
0304-range-sum-query-2d-immutable
0363-max-sum-of-rectangle-no-larger-than-k
0410-split-array-largest-sum
0525-contiguous-array
0560-subarray-sum-equals-k
0892-shortest-subarray-with-sum-at-least-k
0914-random-point-in-non-overlapping-rectangles
0966-binary-subarrays-with-sum
1016-subarray-sums-divisible-by-k
1184-car-pooling
1242-matrix-block-sum
2229-maximum-fruits-harvested-after-at-most-k-steps
2394-count-subarrays-with-score-less-than-k
2529-range-product-queries-of-powers
2656-count-the-number-of-beautiful-subarrays
2915-count-of-interesting-subarrays
3475-minimum-operations-to-make-binary-array-elements-equal-to-one-i
3618-find-the-original-typed-string-ii
3639-zero-array-transformation-i
3647-zero-array-transformation-iii
3789-maximize-subarrays-after-removing-one-conflicting-pair

Hash Table

0001-two-sum
0003-longest-substring-without-repeating-characters
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
0128-longest-consecutive-sequence
0133-clone-graph
0138-copy-list-with-random-pointer
0141-linked-list-cycle
0160-intersection-of-two-linked-lists
0187-repeated-dna-sequences
0205-isomorphic-strings
0208-implement-trie-prefix-tree
0217-contains-duplicate
0219-contains-duplicate-ii
0242-valid-anagram
0347-top-k-frequent-elements
0349-intersection-of-two-arrays
0350-intersection-of-two-arrays-ii
0383-ransom-note
0387-first-unique-character-in-a-string
0424-longest-repeating-character-replacement
0438-find-all-anagrams-in-a-string
0451-sort-characters-by-frequency
0454-4sum-ii
0460-lfu-cache
0525-contiguous-array
0560-subarray-sum-equals-k
0567-permutation-in-string
0594-longest-harmonious-subsequence
0621-task-scheduler
0740-delete-and-earn
0753-open-the-lock
0768-partition-labels
0797-rabbits-in-forest
0833-bus-routes
0926-find-and-replace-pattern
0940-fruit-into-baskets
0964-minimize-malware-spread-ii
0966-binary-subarrays-with-sum
1016-subarray-sums-divisible-by-k
1034-subarrays-with-k-different-integers
1218-lowest-common-ancestor-of-deepest-leaves
1249-snapshot-array
1500-count-largest-group
1510-find-lucky-integer-in-an-array
1635-number-of-good-pairs
1813-maximum-erasure-value
1890-sum-of-beauty-of-all-substrings
1986-largest-color-value-in-a-directed-graph
1995-finding-pairs-with-a-certain-sum
2079-delete-duplicate-folders-in-system
2161-stock-price-fluctuation
2204-find-subsequence-of-length-k-with-the-largest-sum
2220-find-all-possible-recipes-from-given-supplies
2479-meeting-rooms-iii
2520-using-a-robot-to-print-the-lexicographically-smallest-string
2626-count-the-number-of-good-subarrays
2656-count-the-number-of-beautiful-subarrays
2689-rearranging-fruits
2856-count-complete-subarrays-in-an-array
2888-minimum-index-of-a-valid-split
2915-count-of-interesting-subarrays
3360-minimum-deletions-to-make-string-k-special
3445-lexicographically-minimum-string-after-removing-stars
3548-find-the-count-of-good-integers
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
3753-maximum-difference-between-even-and-odd-frequency-i
3754-maximum-manhattan-distance-after-k-changes
3809-properties-graph
3834-minimum-operations-to-convert-all-elements-to-zero
3871-minimum-deletions-for-at-most-k-distinct-characters

Divide and Conquer

0023-merge-k-sorted-lists
0053-maximum-subarray
0105-construct-binary-tree-from-preorder-and-inorder-traversal
0106-construct-binary-tree-from-inorder-and-postorder-traversal
0108-convert-sorted-array-to-binary-search-tree
0240-search-a-2d-matrix-ii
0315-count-of-smaller-numbers-after-self
0347-top-k-frequent-elements
0954-maximum-sum-circular-subarray
1014-k-closest-points-to-origin

Sorting

0015-3sum
0016-3sum-closest
0018-4sum
0049-group-anagrams
0075-sort-colors
0088-merge-sorted-array
0147-insertion-sort-list
0217-contains-duplicate
0242-valid-anagram
0295-find-median-from-data-stream
0347-top-k-frequent-elements
0349-intersection-of-two-arrays
0350-intersection-of-two-arrays-ii
0368-largest-divisible-subset
0378-kth-smallest-element-in-a-sorted-matrix
0406-queue-reconstruction-by-height
0435-non-overlapping-intervals
0451-sort-characters-by-frequency
0452-minimum-number-of-arrows-to-burst-balloons
0475-heaters
0594-longest-harmonious-subsequence
0621-task-scheduler
0646-maximum-length-of-pair-chain
0719-find-k-th-smallest-pair-distance
1014-k-closest-points-to-origin
1019-squares-of-a-sorted-array
1184-car-pooling
1367-maximum-height-by-stacking-cuboids
1478-maximum-number-of-events-that-can-be-attended
1488-sort-integers-by-the-power-value
1621-number-of-subsequences-that-satisfy-the-given-sum-condition
1675-magnetic-force-between-two-balls
1815-checking-existence-of-edge-length-limited-paths
1829-maximum-units-on-a-truck
1851-maximum-number-of-events-that-can-be-attended-ii
1962-single-threaded-cpu
2160-minimum-operations-to-make-a-uni-value-grid
2204-find-subsequence-of-length-k-with-the-largest-sum
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
2689-rearranging-fruits
2888-minimum-index-of-a-valid-split
3241-divide-array-into-arrays-with-max-difference
3307-find-the-maximum-sum-of-node-values
3321-type-of-triangle
3360-minimum-deletions-to-make-string-k-special
3647-zero-array-transformation-iii
3871-minimum-deletions-for-at-most-k-distinct-characters

Heap (Priority Queue)

0023-merge-k-sorted-lists
0239-sliding-window-maximum
0295-find-median-from-data-stream
0347-top-k-frequent-elements
0378-kth-smallest-element-in-a-sorted-matrix
0451-sort-characters-by-frequency
0621-task-scheduler
0744-network-delay-time
0789-kth-largest-element-in-a-stream
0794-swim-in-rising-water
0803-cheapest-flights-within-k-stops
0892-shortest-subarray-with-sum-at-least-k
0902-minimum-number-of-refueling-stops
1014-k-closest-points-to-origin
1184-car-pooling
1478-maximum-number-of-events-that-can-be-attended
1962-single-threaded-cpu
2094-remove-stones-to-minimize-the-total
2161-stock-price-fluctuation
2204-find-subsequence-of-length-k-with-the-largest-sum
2267-minimum-difference-in-sums-after-removal-of-elements
2479-meeting-rooms-iii
2588-maximum-number-of-points-from-grid-queries
3445-lexicographically-minimum-string-after-removing-stars
3647-zero-array-transformation-iii

Bucket Sort

0347-top-k-frequent-elements
0451-sort-characters-by-frequency

Counting

0347-top-k-frequent-elements
0383-ransom-note
0387-first-unique-character-in-a-string
0451-sort-characters-by-frequency
0594-longest-harmonious-subsequence
0621-task-scheduler
0936-rle-iterator
1034-subarrays-with-k-different-integers
1510-find-lucky-integer-in-an-array
1635-number-of-good-pairs
1890-sum-of-beauty-of-all-substrings
1986-largest-color-value-in-a-directed-graph
2140-longest-subsequence-repeated-k-times
3360-minimum-deletions-to-make-string-k-special
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
3871-minimum-deletions-for-at-most-k-distinct-characters

Quickselect

0347-top-k-frequent-elements
1014-k-closest-points-to-origin

Two Pointers

0015-3sum
0016-3sum-closest
0018-4sum
0026-remove-duplicates-from-sorted-array
0027-remove-element
0028-find-the-index-of-the-first-occurrence-in-a-string
0061-rotate-list
0075-sort-colors
0080-remove-duplicates-from-sorted-array-ii
0082-remove-duplicates-from-sorted-list-ii
0086-partition-list
0088-merge-sorted-array
0141-linked-list-cycle
0143-reorder-list
0160-intersection-of-two-linked-lists
0167-two-sum-ii-input-array-is-sorted
0234-palindrome-linked-list
0283-move-zeroes
0295-find-median-from-data-stream
0344-reverse-string
0349-intersection-of-two-arrays
0350-intersection-of-two-arrays-ii
0392-is-subsequence
0475-heaters
0567-permutation-in-string
0633-sum-of-square-numbers
0647-palindromic-substrings
0719-find-k-th-smallest-pair-distance
0768-partition-labels
1019-squares-of-a-sorted-array
1621-number-of-subsequences-that-satisfy-the-given-sum-condition
1815-checking-existence-of-edge-length-limited-paths
2320-find-all-k-distant-indices-in-an-array
2497-maximum-matching-of-players-with-trainers
2588-maximum-number-of-points-from-grid-queries
3245-find-beautiful-indices-in-the-given-array-i
3683-find-the-lexicographically-largest-string-from-the-box-i

Design

0208-implement-trie-prefix-tree
0295-find-median-from-data-stream
0303-range-sum-query-immutable
0304-range-sum-query-2d-immutable
0449-serialize-and-deserialize-bst
0460-lfu-cache
0789-kth-largest-element-in-a-stream
0860-design-circular-queue
0936-rle-iterator
1249-snapshot-array
1995-finding-pairs-with-a-certain-sum
2161-stock-price-fluctuation

Data Stream

0295-find-median-from-data-stream
0789-kth-largest-element-in-a-stream
2161-stock-price-fluctuation

Greedy

0045-jump-game-ii
0055-jump-game
0122-best-time-to-buy-and-sell-stock-ii
0135-candy
0330-patching-array
0410-split-array-largest-sum
0435-non-overlapping-intervals
0452-minimum-number-of-arrows-to-burst-balloons
0621-task-scheduler
0646-maximum-length-of-pair-chain
0678-valid-parenthesis-string
0768-partition-labels
0770-couples-holding-hands
0797-rabbits-in-forest
0825-max-increase-to-keep-city-skyline
0890-lemonade-change
0902-minimum-number-of-refueling-stops
1081-video-stitching
1448-maximum-69-number
1451-minimum-number-of-taps-to-open-to-water-a-garden
1478-maximum-number-of-events-that-can-be-attended
1529-max-difference-you-can-get-from-changing-an-integer
1818-maximum-score-from-removing-substrings
1829-maximum-units-on-a-truck
2032-largest-odd-number-in-string
2094-remove-stones-to-minimize-the-total
2140-longest-subsequence-repeated-k-times
2279-maximum-split-of-positive-even-integers
2337-remove-digit-from-number-to-maximize-result
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
2689-rearranging-fruits
2704-maximum-difference-by-remapping-a-digit
2720-minimize-the-maximum-difference-of-pairs
3143-longest-unequal-adjacent-groups-subsequence-i
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
3647-zero-array-transformation-iii
3743-reschedule-meetings-for-maximum-free-time-i
3834-minimum-operations-to-convert-all-elements-to-zero
3871-minimum-deletions-for-at-most-k-distinct-characters

Union Find

0128-longest-consecutive-sequence
0130-surrounded-regions
0200-number-of-islands
0399-evaluate-division
0547-number-of-provinces
0695-max-area-of-island
0770-couples-holding-hands
0794-swim-in-rising-water
0964-minimize-malware-spread-ii
1706-min-cost-to-connect-all-points
1815-checking-existence-of-edge-length-limited-paths
2588-maximum-number-of-points-from-grid-queries
2793-count-the-number-of-complete-components
3348-minimum-cost-walk-in-weighted-graph
3809-properties-graph

Graph

0133-clone-graph
0207-course-schedule
0329-longest-increasing-path-in-a-matrix
0332-reconstruct-itinerary
0399-evaluate-division
0547-number-of-provinces
0744-network-delay-time
0770-couples-holding-hands
0803-cheapest-flights-within-k-stops
0813-all-paths-from-source-to-target
0964-minimize-malware-spread-ii
1120-flower-planting-with-no-adjacent
1309-sort-items-by-groups-respecting-dependencies
1424-maximum-candies-you-can-get-from-boxes
1431-all-ancestors-of-a-node-in-a-directed-acyclic-graph
1706-min-cost-to-connect-all-points
1815-checking-existence-of-edge-length-limited-paths
1986-largest-color-value-in-a-directed-graph
2090-number-of-ways-to-arrive-at-destination
2201-valid-arrangement-of-pairs
2206-detonate-the-maximum-bombs
2220-find-all-possible-recipes-from-given-supplies
2438-find-closest-node-to-given-two-nodes
2439-longest-cycle-in-a-graph
2671-shortest-cycle-in-a-graph
2793-count-the-number-of-complete-components
3348-minimum-cost-walk-in-weighted-graph
3439-find-minimum-diameter-after-merging-two-trees
3809-properties-graph

Topological Sort

0207-course-schedule
0329-longest-increasing-path-in-a-matrix
1309-sort-items-by-groups-respecting-dependencies
1431-all-ancestors-of-a-node-in-a-directed-acyclic-graph
1986-largest-color-value-in-a-directed-graph
2090-number-of-ways-to-arrive-at-destination
2220-find-all-possible-recipes-from-given-supplies
2439-longest-cycle-in-a-graph

Trie

0208-implement-trie-prefix-tree
0386-lexicographical-numbers
0440-k-th-smallest-in-lexicographical-order
2079-delete-duplicate-folders-in-system

Depth-First Search

0094-binary-tree-inorder-traversal
0098-validate-binary-search-tree
0099-recover-binary-search-tree
0104-maximum-depth-of-binary-tree
0114-flatten-binary-tree-to-linked-list
0117-populating-next-right-pointers-in-each-node-ii
0124-binary-tree-maximum-path-sum
0130-surrounded-regions
0133-clone-graph
0144-binary-tree-preorder-traversal
0145-binary-tree-postorder-traversal
0199-binary-tree-right-side-view
0200-number-of-islands
0207-course-schedule
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
0329-longest-increasing-path-in-a-matrix
0332-reconstruct-itinerary
0386-lexicographical-numbers
0399-evaluate-division
0417-pacific-atlantic-water-flow
0419-battleships-in-a-board
0449-serialize-and-deserialize-bst
0538-convert-bst-to-greater-tree
0547-number-of-provinces
0606-construct-string-from-binary-tree
0687-longest-univalue-path
0695-max-area-of-island
0733-flood-fill
0744-network-delay-time
0770-couples-holding-hands
0774-maximum-depth-of-n-ary-tree
0794-swim-in-rising-water
0803-cheapest-flights-within-k-stops
0813-all-paths-from-source-to-target
0832-binary-tree-pruning
0933-increasing-order-search-tree
0964-minimize-malware-spread-ii
0975-range-sum-of-bst
1114-binary-search-tree-to-greater-sum-tree
1120-flower-planting-with-no-adjacent
1218-lowest-common-ancestor-of-deepest-leaves
1309-sort-items-by-groups-respecting-dependencies
1431-all-ancestors-of-a-node-in-a-directed-acyclic-graph
1544-count-good-nodes-in-binary-tree
2201-valid-arrangement-of-pairs
2206-detonate-the-maximum-bombs
2400-minimum-score-after-removals-on-a-tree
2438-find-closest-node-to-given-two-nodes
2439-longest-cycle-in-a-graph
2793-count-the-number-of-complete-components
3439-find-minimum-diameter-after-merging-two-trees
3633-maximize-the-number-of-target-nodes-after-connecting-trees-i
3809-properties-graph

Breadth-First Search

0102-binary-tree-level-order-traversal
0103-binary-tree-zigzag-level-order-traversal
0104-maximum-depth-of-binary-tree
0107-binary-tree-level-order-traversal-ii
0117-populating-next-right-pointers-in-each-node-ii
0130-surrounded-regions
0133-clone-graph
0199-binary-tree-right-side-view
0200-number-of-islands
0207-course-schedule
0322-coin-change
0329-longest-increasing-path-in-a-matrix
0399-evaluate-division
0417-pacific-atlantic-water-flow
0449-serialize-and-deserialize-bst
0542-01-matrix
0547-number-of-provinces
0695-max-area-of-island
0733-flood-fill
0744-network-delay-time
0753-open-the-lock
0764-n-ary-tree-level-order-traversal
0770-couples-holding-hands
0774-maximum-depth-of-n-ary-tree
0794-swim-in-rising-water
0803-cheapest-flights-within-k-stops
0813-all-paths-from-source-to-target
0833-bus-routes
0945-snakes-and-ladders
0964-minimize-malware-spread-ii
1036-rotting-oranges
1120-flower-planting-with-no-adjacent
1171-shortest-path-in-binary-matrix
1218-lowest-common-ancestor-of-deepest-leaves
1309-sort-items-by-groups-respecting-dependencies
1424-maximum-candies-you-can-get-from-boxes
1431-all-ancestors-of-a-node-in-a-directed-acyclic-graph
1544-count-good-nodes-in-binary-tree
2206-detonate-the-maximum-bombs
2439-longest-cycle-in-a-graph
2588-maximum-number-of-points-from-grid-queries
2671-shortest-cycle-in-a-graph
2793-count-the-number-of-complete-components
3439-find-minimum-diameter-after-merging-two-trees
3633-maximize-the-number-of-target-nodes-after-connecting-trees-i
3809-properties-graph

Dynamic Programming

0010-regular-expression-matching
0032-longest-valid-parentheses
0045-jump-game-ii
0053-maximum-subarray
0055-jump-game
0062-unique-paths
0064-minimum-path-sum
0072-edit-distance
0087-scramble-string
0091-decode-ways
0095-unique-binary-search-trees-ii
0118-pascals-triangle
0121-best-time-to-buy-and-sell-stock
0122-best-time-to-buy-and-sell-stock-ii
0123-best-time-to-buy-and-sell-stock-iii
0124-binary-tree-maximum-path-sum
0131-palindrome-partitioning
0152-maximum-product-subarray
0198-house-robber
0213-house-robber-ii
0300-longest-increasing-subsequence
0322-coin-change
0329-longest-increasing-path-in-a-matrix
0368-largest-divisible-subset
0375-guess-number-higher-or-lower-ii
0392-is-subsequence
0403-frog-jump
0410-split-array-largest-sum
0416-partition-equal-subset-sum
0435-non-overlapping-intervals
0494-target-sum
0542-01-matrix
0552-student-attendance-record-ii
0583-delete-operation-for-two-strings
0646-maximum-length-of-pair-chain
0647-palindromic-substrings
0678-valid-parenthesis-string
0688-knight-probability-in-chessboard
0698-partition-to-k-equal-sum-subsets
0740-delete-and-earn
0741-cherry-pickup
0747-min-cost-climbing-stairs
0803-cheapest-flights-within-k-stops
0815-champagne-tower
0826-soup-servings
0836-race-car
0867-new-21-game
0902-minimum-number-of-refueling-stops
0930-all-possible-full-binary-trees
0934-bitwise-ors-of-subarrays
0954-maximum-sum-circular-subarray
1025-minimum-cost-for-tickets
1081-video-stitching
1196-filling-bookcase-shelves
1250-longest-common-subsequence
1367-maximum-height-by-stacking-cuboids
1402-count-square-submatrices-with-all-ones
1437-minimum-insertion-steps-to-make-a-string-palindrome
1451-minimum-number-of-taps-to-open-to-water-a-garden
1488-sort-integers-by-the-power-value
1522-stone-game-iii
1527-number-of-ways-to-paint-n-3-grid
1628-count-submatrices-with-all-ones
1851-maximum-number-of-events-that-can-be-attended-ii
1986-largest-color-value-in-a-directed-graph
1989-minimum-xor-sum-of-two-arrays
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
2262-solving-questions-with-brainpower
2267-minimum-difference-in-sums-after-removal-of-elements
2395-longest-binary-subsequence-less-than-or-equal-to-k
2415-count-the-number-of-ideal-arrays
2882-ways-to-express-an-integer-as-sum-of-powers
3142-longest-unequal-adjacent-groups-subsequence-ii
3143-longest-unequal-adjacent-groups-subsequence-i
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
3618-find-the-original-typed-string-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

Shortest Path

0399-evaluate-division
0744-network-delay-time
0803-cheapest-flights-within-k-stops
2090-number-of-ways-to-arrive-at-destination

Math

0002-add-two-numbers
0043-multiply-strings
0062-unique-paths
0231-power-of-two
0367-valid-perfect-square
0368-largest-divisible-subset
0375-guess-number-higher-or-lower-ii
0390-elimination-game
0598-range-addition-ii
0633-sum-of-square-numbers
0755-reach-a-number
0797-rabbits-in-forest
0826-soup-servings
0867-new-21-game
0914-random-point-in-non-overlapping-rectangles
1014-k-closest-points-to-origin
1307-ugly-number-iii
1411-convert-binary-number-in-a-linked-list-to-integer
1448-maximum-69-number
1500-count-largest-group
1522-stone-game-iii
1529-max-difference-you-can-get-from-changing-an-integer
1635-number-of-good-pairs
1993-sum-of-all-subset-xor-totals
2032-largest-odd-number-in-string
2050-count-good-numbers
2160-minimum-operations-to-make-a-uni-value-grid
2202-sum-of-k-mirror-numbers
2206-detonate-the-maximum-bombs
2279-maximum-split-of-positive-even-integers
2415-count-the-number-of-ideal-arrays
2432-number-of-zero-filled-subarrays
2704-maximum-difference-by-remapping-a-digit
2998-count-symmetric-integers
3172-divisible-and-non-divisible-sums-difference
3201-distribute-candies-among-children-ii
3321-type-of-triangle
3548-find-the-count-of-good-integers
3600-find-the-k-th-character-in-string-game-i
3601-find-the-k-th-character-in-string-game-ii
3629-total-characters-in-string-after-transformations-i
3630-total-characters-in-string-after-transformations-ii
3637-count-number-of-balanced-permutations
3754-maximum-manhattan-distance-after-k-changes

Matrix

0054-spiral-matrix
0064-minimum-path-sum
0073-set-matrix-zeroes
0074-search-a-2d-matrix
0130-surrounded-regions
0200-number-of-islands
0240-search-a-2d-matrix-ii
0289-game-of-life
0304-range-sum-query-2d-immutable
0329-longest-increasing-path-in-a-matrix
0363-max-sum-of-rectangle-no-larger-than-k
0378-kth-smallest-element-in-a-sorted-matrix
0417-pacific-atlantic-water-flow
0419-battleships-in-a-board
0498-diagonal-traverse
0542-01-matrix
0695-max-area-of-island
0733-flood-fill
0741-cherry-pickup
0794-swim-in-rising-water
0825-max-increase-to-keep-city-skyline
0945-snakes-and-ladders
1036-rotting-oranges
1171-shortest-path-in-binary-matrix
1242-matrix-block-sum
1402-count-square-submatrices-with-all-ones
1628-count-submatrices-with-all-ones
2047-find-a-peak-element-ii
2160-minimum-operations-to-make-a-uni-value-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
3648-find-the-maximum-number-of-fruits-collected
3733-length-of-longest-v-shaped-diagonal-segment

Tree

0094-binary-tree-inorder-traversal
0095-unique-binary-search-trees-ii
0098-validate-binary-search-tree
0099-recover-binary-search-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
0107-binary-tree-level-order-traversal-ii
0108-convert-sorted-array-to-binary-search-tree
0114-flatten-binary-tree-to-linked-list
0117-populating-next-right-pointers-in-each-node-ii
0124-binary-tree-maximum-path-sum
0144-binary-tree-preorder-traversal
0145-binary-tree-postorder-traversal
0199-binary-tree-right-side-view
0222-count-complete-tree-nodes
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
0449-serialize-and-deserialize-bst
0450-delete-node-in-a-bst
0538-convert-bst-to-greater-tree
0606-construct-string-from-binary-tree
0687-longest-univalue-path
0764-n-ary-tree-level-order-traversal
0774-maximum-depth-of-n-ary-tree
0783-search-in-a-binary-search-tree
0784-insert-into-a-binary-search-tree
0789-kth-largest-element-in-a-stream
0832-binary-tree-pruning
0930-all-possible-full-binary-trees
0933-increasing-order-search-tree
0975-range-sum-of-bst
1040-maximum-binary-tree-ii
1114-binary-search-tree-to-greater-sum-tree
1218-lowest-common-ancestor-of-deepest-leaves
1544-count-good-nodes-in-binary-tree
2400-minimum-score-after-removals-on-a-tree
3307-find-the-maximum-sum-of-node-values
3439-find-minimum-diameter-after-merging-two-trees
3633-maximize-the-number-of-target-nodes-after-connecting-trees-i

Binary Tree

0094-binary-tree-inorder-traversal
0095-unique-binary-search-trees-ii
0098-validate-binary-search-tree
0099-recover-binary-search-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
0107-binary-tree-level-order-traversal-ii
0108-convert-sorted-array-to-binary-search-tree
0114-flatten-binary-tree-to-linked-list
0117-populating-next-right-pointers-in-each-node-ii
0124-binary-tree-maximum-path-sum
0144-binary-tree-preorder-traversal
0145-binary-tree-postorder-traversal
0199-binary-tree-right-side-view
0222-count-complete-tree-nodes
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
0449-serialize-and-deserialize-bst
0450-delete-node-in-a-bst
0538-convert-bst-to-greater-tree
0606-construct-string-from-binary-tree
0687-longest-univalue-path
0783-search-in-a-binary-search-tree
0784-insert-into-a-binary-search-tree
0789-kth-largest-element-in-a-stream
0832-binary-tree-pruning
0930-all-possible-full-binary-trees
0933-increasing-order-search-tree
0975-range-sum-of-bst
1040-maximum-binary-tree-ii
1114-binary-search-tree-to-greater-sum-tree
1218-lowest-common-ancestor-of-deepest-leaves
1544-count-good-nodes-in-binary-tree

Backtracking

0095-unique-binary-search-trees-ii
0131-palindrome-partitioning
0257-binary-tree-paths
0494-target-sum
0698-partition-to-k-equal-sum-subsets
0813-all-paths-from-source-to-target
1516-the-k-th-lexicographical-string-of-all-happy-strings-of-length-n
1993-sum-of-all-subset-xor-totals
2140-longest-subsequence-repeated-k-times
2279-maximum-split-of-positive-even-integers

Combinatorics

0062-unique-paths
1307-ugly-number-iii
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
3637-count-number-of-balanced-permutations

Enumeration

1656-count-good-triplets
1993-sum-of-all-subset-xor-totals
2140-longest-subsequence-repeated-k-times
2202-sum-of-k-mirror-numbers
2337-remove-digit-from-number-to-maximize-result
2998-count-symmetric-integers
3201-distribute-candies-among-children-ii
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
3789-maximize-subarrays-after-removing-one-conflicting-pair

Recursion

0002-add-two-numbers
0010-regular-expression-matching
0021-merge-two-sorted-lists
0024-swap-nodes-in-pairs
0025-reverse-nodes-in-k-group
0143-reorder-list
0203-remove-linked-list-elements
0206-reverse-linked-list
0231-power-of-two
0234-palindrome-linked-list
0390-elimination-game
0394-decode-string
0930-all-possible-full-binary-trees
2050-count-good-numbers
3600-find-the-k-th-character-in-string-game-i
3601-find-the-k-th-character-in-string-game-ii

Number Theory

1307-ugly-number-iii
2415-count-the-number-of-ideal-arrays

Monotonic Queue

0239-sliding-window-maximum
0892-shortest-subarray-with-sum-at-least-k
0954-maximum-sum-circular-subarray
2527-count-subarrays-with-fixed-bounds

Binary Search

0033-search-in-rotated-sorted-array
0034-find-first-and-last-position-of-element-in-sorted-array
0035-search-insert-position
0074-search-a-2d-matrix
0081-search-in-rotated-sorted-array-ii
0153-find-minimum-in-rotated-sorted-array
0167-two-sum-ii-input-array-is-sorted
0209-minimum-size-subarray-sum
0222-count-complete-tree-nodes
0240-search-a-2d-matrix-ii
0278-first-bad-version
0300-longest-increasing-subsequence
0315-count-of-smaller-numbers-after-self
0349-intersection-of-two-arrays
0350-intersection-of-two-arrays-ii
0363-max-sum-of-rectangle-no-larger-than-k
0367-valid-perfect-square
0378-kth-smallest-element-in-a-sorted-matrix
0410-split-array-largest-sum
0456-132-pattern
0475-heaters
0633-sum-of-square-numbers
0719-find-k-th-smallest-pair-distance
0755-reach-a-number
0792-binary-search
0794-swim-in-rising-water
0892-shortest-subarray-with-sum-at-least-k
0907-koko-eating-bananas
0914-random-point-in-non-overlapping-rectangles
1056-capacity-to-ship-packages-within-d-days
1122-longest-duplicate-substring
1249-snapshot-array
1307-ugly-number-iii
1408-find-the-smallest-divisor-given-a-threshold
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
1851-maximum-number-of-events-that-can-be-attended-ii
2047-find-a-peak-element-ii
2150-kth-smallest-product-of-two-sorted-arrays
2229-maximum-fruits-harvested-after-at-most-k-steps
2394-count-subarrays-with-score-less-than-k
2498-smallest-subarrays-with-maximum-bitwise-or
2720-minimize-the-maximum-difference-of-pairs
3245-find-beautiful-indices-in-the-given-array-i
3790-fruits-into-baskets-ii
3791-fruits-into-baskets-iii

Stack

0032-longest-valid-parentheses
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
0234-palindrome-linked-list
0394-decode-string
0456-132-pattern
0678-valid-parenthesis-string
0933-increasing-order-search-tree
0983-validate-stack-sequences
1628-count-submatrices-with-all-ones
1818-maximum-score-from-removing-substrings
2520-using-a-robot-to-print-the-lexicographically-smallest-string
3445-lexicographically-minimum-string-after-removing-stars
3834-minimum-operations-to-convert-all-elements-to-zero

Monotonic Stack

0456-132-pattern
1628-count-submatrices-with-all-ones
3834-minimum-operations-to-convert-all-elements-to-zero

Game Theory

0375-guess-number-higher-or-lower-ii
1522-stone-game-iii

Binary Search Tree

0095-unique-binary-search-trees-ii
0098-validate-binary-search-tree
0099-recover-binary-search-tree
0108-convert-sorted-array-to-binary-search-tree
0230-kth-smallest-element-in-a-bst
0235-lowest-common-ancestor-of-a-binary-search-tree
0449-serialize-and-deserialize-bst
0450-delete-node-in-a-bst
0538-convert-bst-to-greater-tree
0783-search-in-a-binary-search-tree
0784-insert-into-a-binary-search-tree
0789-kth-largest-element-in-a-stream
0933-increasing-order-search-tree
0975-range-sum-of-bst
1114-binary-search-tree-to-greater-sum-tree

Memoization

0329-longest-increasing-path-in-a-matrix
0698-partition-to-k-equal-sum-subsets
0930-all-possible-full-binary-trees
1488-sort-integers-by-the-power-value
1986-largest-color-value-in-a-directed-graph
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

Simulation

0043-multiply-strings
0054-spiral-matrix
0289-game-of-life
0498-diagonal-traverse
0983-validate-stack-sequences
1184-car-pooling
2048-build-array-from-permutation
2260-divide-a-string-into-groups-of-size-k
2479-meeting-rooms-iii
3600-find-the-k-th-character-in-string-game-i
3790-fruits-into-baskets-ii

Ordered Set

0315-count-of-smaller-numbers-after-self
0363-max-sum-of-rectangle-no-larger-than-k
0456-132-pattern
0914-random-point-in-non-overlapping-rectangles
2161-stock-price-fluctuation
3790-fruits-into-baskets-ii
3791-fruits-into-baskets-iii

Interactive

0278-first-bad-version

Linked List

0002-add-two-numbers
0021-merge-two-sorted-lists
0023-merge-k-sorted-lists
0024-swap-nodes-in-pairs
0025-reverse-nodes-in-k-group
0061-rotate-list
0082-remove-duplicates-from-sorted-list-ii
0086-partition-list
0092-reverse-linked-list-ii
0114-flatten-binary-tree-to-linked-list
0117-populating-next-right-pointers-in-each-node-ii
0138-copy-list-with-random-pointer
0141-linked-list-cycle
0143-reorder-list
0147-insertion-sort-list
0160-intersection-of-two-linked-lists
0203-remove-linked-list-elements
0206-reverse-linked-list
0234-palindrome-linked-list
0237-delete-node-in-a-linked-list
0328-odd-even-linked-list
0460-lfu-cache
0860-design-circular-queue
1411-convert-binary-number-in-a-linked-list-to-integer

Rolling Hash

0187-repeated-dna-sequences
1122-longest-duplicate-substring
3245-find-beautiful-indices-in-the-given-array-i

Hash Function

0187-repeated-dna-sequences
1122-longest-duplicate-substring
2079-delete-duplicate-folders-in-system
3245-find-beautiful-indices-in-the-given-array-i

Binary Indexed Tree

0315-count-of-smaller-numbers-after-self
0406-queue-reconstruction-by-height

Segment Tree

0315-count-of-smaller-numbers-after-self
0406-queue-reconstruction-by-height
3789-maximize-subarrays-after-removing-one-conflicting-pair
3790-fruits-into-baskets-ii
3791-fruits-into-baskets-iii

Probability and Statistics

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

Geometry

1014-k-closest-points-to-origin
2206-detonate-the-maximum-bombs

Bitmask

0698-partition-to-k-equal-sum-subsets
1989-minimum-xor-sum-of-two-arrays

Iterator

0936-rle-iterator

Reservoir Sampling

0914-random-point-in-non-overlapping-rectangles

Randomized

0914-random-point-in-non-overlapping-rectangles

Eulerian Circuit

0332-reconstruct-itinerary
2201-valid-arrangement-of-pairs

String Matching

0028-find-the-index-of-the-first-occurrence-in-a-string
0459-repeated-substring-pattern
3245-find-beautiful-indices-in-the-given-array-i

Merge Sort

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

Minimum Spanning Tree

1706-min-cost-to-connect-all-points

Suffix Array

1122-longest-duplicate-substring

Brainteaser

2503-longest-subarray-with-maximum-bitwise-and

Doubly-Linked List

0460-lfu-cache