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

LeetCode Topics

Math

0069-sqrtx
0241-different-ways-to-add-parentheses
0264-ugly-number-ii
0273-integer-to-english-words
0368-largest-divisible-subset
0539-minimum-time-difference
0592-fraction-addition-and-subtraction
0650-2-keys-keyboard
0797-rabbits-in-forest
0870-magic-squares-in-grid
0909-stone-game
1240-stone-game-ii
1421-find-numbers-with-even-number-of-digits
1477-product-of-the-last-k-numbers
1500-count-largest-group
1631-number-of-sub-arrays-with-odd-sum
1642-water-bottles
1889-check-if-number-is-a-sum-of-powers-of-three
1951-find-the-winner-of-the-circular-game
1993-sum-of-all-subset-xor-totals
2106-find-greatest-common-divisor-of-array
2155-find-missing-observations
2160-minimum-operations-to-make-a-uni-value-grid
2202-sum-of-k-mirror-numbers
2448-count-number-of-bad-pairs
2649-count-total-number-of-colored-cells
2704-maximum-difference-by-remapping-a-digit
2802-find-the-punishment-number-of-an-integer
2903-insert-greatest-common-divisors-in-linked-list
2998-count-symmetric-integers
3172-divisible-and-non-divisible-sums-difference
3201-distribute-candies-among-children-ii
3227-find-missing-and-repeated-values
3243-count-the-number-of-powerful-integers
3321-type-of-triangle
3555-final-array-state-after-k-multiplication-operations-i
3629-total-characters-in-string-after-transformations-i
3637-count-number-of-balanced-permutations
3682-count-the-number-of-arrays-with-k-matching-adjacent-elements
3754-maximum-manhattan-distance-after-k-changes

Simulation

0592-fraction-addition-and-subtraction
0906-walking-robot-simulation
0921-spiral-matrix-iii
1642-water-bottles
1803-average-waiting-time
1951-find-the-winner-of-the-circular-game
2006-find-the-student-that-will-replace-the-chalk
2021-remove-all-occurrences-of-a-substring
2048-build-array-from-permutation
2076-sum-of-digits-of-string-after-convert
2155-find-missing-observations
2232-adding-spaces-to-a-string
2411-spiral-matrix-iv
2551-apply-operations-to-an-array
2800-minimum-string-length-after-removing-substrings
3447-clear-digits
3555-final-array-state-after-k-multiplication-operations-i

Array

0001-two-sum
0034-find-first-and-last-position-of-element-in-sorted-array
0035-search-insert-position
0040-combination-sum-ii
0073-set-matrix-zeroes
0081-search-in-rotated-sorted-array-ii
0135-candy
0162-find-peak-element
0179-largest-number
0368-largest-divisible-subset
0407-trapping-rain-water-ii
0494-target-sum
0539-minimum-time-difference
0624-maximum-distance-in-arrays
0632-smallest-range-covering-elements-from-k-lists
0689-maximum-sum-of-3-non-overlapping-subarrays
0729-my-calendar-i
0731-my-calendar-ii
0780-max-chunks-to-make-sorted
0787-sliding-puzzle
0792-binary-search
0797-rabbits-in-forest
0854-making-a-large-island
0870-magic-squares-in-grid
0890-lemonade-change
0905-length-of-longest-fibonacci-subsequence
0906-walking-robot-simulation
0909-stone-game
0921-spiral-matrix-iii
0925-construct-binary-tree-from-preorder-and-postorder-traversal
0952-word-subsets
0999-regions-cut-by-slashes
1240-stone-game-ii
1256-rank-transform-of-an-array
1293-three-consecutive-odds
1325-path-with-maximum-probability
1335-maximum-candies-allocated-to-k-children
1350-remove-sub-folders-from-the-filesystem
1364-tuple-with-same-product
1402-count-square-submatrices-with-all-ones
1421-find-numbers-with-even-number-of-digits
1435-xor-queries-of-a-subarray
1468-check-if-n-and-its-double-exist
1477-product-of-the-last-k-numbers
1485-minimum-cost-to-make-at-least-one-valid-path-in-a-grid
1497-design-a-stack-with-increment-operation
1620-check-if-array-pairs-are-divisible-by-k
1631-number-of-sub-arrays-with-odd-sum
1679-shortest-subarray-to-be-removed-to-make-array-sorted
1694-make-sum-divisible-by-p
1720-crawler-log-folder
1744-number-of-ways-to-form-a-target-string-given-a-dictionary
1755-defuse-the-bomb
1786-count-the-number-of-consistent-strings
1803-average-waiting-time
1819-construct-the-lexicographically-largest-valid-sequence
1849-maximum-absolute-sum-of-any-subarray
1895-minimum-number-of-operations-to-move-all-balls-to-each-box
1923-sentence-similarity-iii
1927-maximum-ascending-subarray-sum
1940-maximum-xor-for-each-query
1951-find-the-winner-of-the-circular-game
1993-sum-of-all-subset-xor-totals
2006-find-the-student-that-will-replace-the-chalk
2035-count-sub-islands
2048-build-array-from-permutation
2054-the-number-of-the-smallest-unoccupied-chair
2106-find-greatest-common-divisor-of-array
2144-maximum-difference-between-increasing-elements
2145-grid-game
2150-kth-smallest-product-of-two-sorted-arrays
2155-find-missing-observations
2160-minimum-operations-to-make-a-uni-value-grid
2163-kth-distinct-string-in-an-array
2179-most-beautiful-item-for-each-query
2204-find-subsequence-of-length-k-with-the-largest-sum
2215-finding-3-digit-even-numbers
2220-find-all-possible-recipes-from-given-supplies
2232-adding-spaces-to-a-string
2262-solving-questions-with-brainpower
2280-count-good-triplets-in-an-array
2308-divide-array-into-equal-pairs
2356-largest-combination-with-bitwise-and-greater-than-zero
2387-partition-array-such-that-maximum-difference-is-k
2394-count-subarrays-with-score-less-than-k
2411-spiral-matrix-iv
2448-count-number-of-bad-pairs
2465-shifting-letters-ii
2488-divide-intervals-into-minimum-number-of-groups
2494-sum-of-prefix-scores-of-strings
2533-bitwise-xor-of-all-pairings
2545-height-of-binary-tree-after-subtree-removal-queries
2551-apply-operations-to-an-array
2564-most-profitable-path-in-a-tree
2581-divide-players-into-teams-of-equal-skill
2586-longest-square-streak-in-an-array
2616-maximal-score-after-applying-k-operations
2626-count-the-number-of-good-subarrays
2685-first-completely-painted-row-or-column
2691-count-vowel-strings-in-ranges
2711-minimum-time-to-visit-a-cell-in-a-grid
2720-minimize-the-maximum-difference-of-pairs
2764-maximum-number-of-fish-in-a-grid
2766-find-the-prefix-common-array-of-two-arrays
2792-neighboring-bitwise-xor
2794-maximum-number-of-moves-in-a-grid
2888-minimum-index-of-a-valid-split
2891-maximum-beauty-of-an-array-after-applying-operation
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
3219-make-lexicographically-smallest-array-by-swapping-elements
3227-find-missing-and-repeated-values
3241-divide-array-into-arrays-with-max-difference
3307-find-the-maximum-sum-of-node-values
3309-count-prefix-and-suffix-pairs-i
3321-type-of-triangle
3329-find-the-length-of-the-longest-common-prefix
3348-minimum-cost-walk-in-weighted-graph
3372-longest-strictly-increasing-or-strictly-decreasing-subarray
3380-shortest-subarray-with-or-at-least-k-ii
3429-special-array-i
3430-count-days-without-meetings
3475-minimum-operations-to-make-binary-array-elements-equal-to-one-i
3501-delete-nodes-from-linked-list-present-in-array
3555-final-array-state-after-k-multiplication-operations-i
3627-find-minimum-time-to-reach-last-room-i
3643-zero-array-transformation-ii
3647-zero-array-transformation-iii
3747-maximum-difference-between-adjacent-elements-in-a-circular-array

Recursion

0241-different-ways-to-add-parentheses
0273-integer-to-english-words
1951-find-the-winner-of-the-circular-game

Queue

1951-find-the-winner-of-the-circular-game
3475-minimum-operations-to-make-binary-array-elements-equal-to-one-i

String

0179-largest-number
0241-different-ways-to-add-parentheses
0273-integer-to-english-words
0345-reverse-vowels-of-a-string
0539-minimum-time-difference
0567-permutation-in-string
0592-fraction-addition-and-subtraction
0664-strange-printer
0868-push-dominoes
0920-uncommon-words-from-two-sentences
0952-word-subsets
0957-minimum-add-to-make-parentheses-valid
1058-lexicographically-smallest-equivalent-string
1093-recover-a-tree-from-preorder-traversal
1160-letter-tile-possibilities
1170-shortest-common-supersequence
1304-longest-happy-string
1350-remove-sub-folders-from-the-filesystem
1460-number-of-substrings-containing-all-three-characters
1473-find-the-longest-substring-containing-vowels-in-even-counts
1516-the-k-th-lexicographical-string-of-all-happy-strings-of-length-n
1537-maximum-score-after-splitting-a-string
1566-check-if-a-word-occurs-as-a-prefix-of-any-word-in-a-sentence
1715-split-a-string-into-the-max-number-of-unique-substrings
1720-crawler-log-folder
1744-number-of-ways-to-form-a-target-string-given-a-dictionary
1786-count-the-number-of-consistent-strings
1895-minimum-number-of-operations-to-move-all-balls-to-each-box
1915-check-if-one-string-swap-can-make-strings-equal
1923-sentence-similarity-iii
2021-remove-all-occurrences-of-a-substring
2059-unique-length-3-palindromic-subsequences
2076-sum-of-digits-of-string-after-convert
2095-minimum-number-of-swaps-to-make-the-string-balanced
2140-longest-subsequence-repeated-k-times
2163-kth-distinct-string-in-an-array
2220-find-all-possible-recipes-from-given-supplies
2221-check-if-a-parentheses-string-can-be-valid
2232-adding-spaces-to-a-string
2300-construct-string-with-repeat-limit
2395-longest-binary-subsequence-less-than-or-equal-to-k
2465-shifting-letters-ii
2494-sum-of-prefix-scores-of-strings
2520-using-a-robot-to-print-the-lexicographically-smallest-string
2599-take-k-of-each-character-from-left-and-right
2691-count-vowel-strings-in-ranges
2800-minimum-string-length-after-removing-substrings
3018-make-string-a-subsequence-using-cyclic-increments
3142-longest-unequal-adjacent-groups-subsequence-ii
3143-longest-unequal-adjacent-groups-subsequence-i
3174-minimum-number-of-changes-to-make-binary-string-beautiful
3194-find-words-containing-character
3195-separate-black-and-white-balls
3243-count-the-number-of-powerful-integers
3267-find-longest-special-substring-that-occurs-thrice-i
3276-minimum-number-of-pushes-to-type-word-ii
3309-count-prefix-and-suffix-pairs-i
3329-find-the-length-of-the-longest-common-prefix
3360-minimum-deletions-to-make-string-k-special
3445-lexicographically-minimum-string-after-removing-stars
3447-clear-digits
3455-minimum-length-of-string-after-operations
3569-count-of-substrings-containing-every-vowel-and-k-consonants-ii
3617-find-the-original-typed-string-i
3629-total-characters-in-string-after-transformations-i
3637-count-number-of-balanced-permutations
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

Stack

0776-n-ary-tree-postorder-traversal
0780-max-chunks-to-make-sorted
0957-minimum-add-to-make-parentheses-valid
1497-design-a-stack-with-increment-operation
1679-shortest-subarray-to-be-removed-to-make-array-sorted
1720-crawler-log-folder
2021-remove-all-occurrences-of-a-substring
2095-minimum-number-of-swaps-to-make-the-string-balanced
2221-check-if-a-parentheses-string-can-be-valid
2520-using-a-robot-to-print-the-lexicographically-smallest-string
2800-minimum-string-length-after-removing-substrings
3445-lexicographically-minimum-string-after-removing-stars
3447-clear-digits

Number Theory

2106-find-greatest-common-divisor-of-array
2903-insert-greatest-common-divisors-in-linked-list

Hash Table

0001-two-sum
0073-set-matrix-zeroes
0141-linked-list-cycle
0264-ugly-number-ii
0432-all-oone-data-structure
0567-permutation-in-string
0632-smallest-range-covering-elements-from-k-lists
0797-rabbits-in-forest
0870-magic-squares-in-grid
0905-length-of-longest-fibonacci-subsequence
0906-walking-robot-simulation
0920-uncommon-words-from-two-sentences
0925-construct-binary-tree-from-preorder-and-postorder-traversal
0952-word-subsets
0984-most-stones-removed-with-same-row-or-column
0999-regions-cut-by-slashes
1160-letter-tile-possibilities
1218-lowest-common-ancestor-of-deepest-leaves
1256-rank-transform-of-an-array
1364-tuple-with-same-product
1460-number-of-substrings-containing-all-three-characters
1468-check-if-n-and-its-double-exist
1473-find-the-longest-substring-containing-vowels-in-even-counts
1500-count-largest-group
1620-check-if-array-pairs-are-divisible-by-k
1694-make-sum-divisible-by-p
1715-split-a-string-into-the-max-number-of-unique-substrings
1786-count-the-number-of-consistent-strings
1915-check-if-one-string-swap-can-make-strings-equal
1986-largest-color-value-in-a-directed-graph
2054-the-number-of-the-smallest-unoccupied-chair
2059-unique-length-3-palindromic-subsequences
2163-kth-distinct-string-in-an-array
2204-find-subsequence-of-length-k-with-the-largest-sum
2215-finding-3-digit-even-numbers
2220-find-all-possible-recipes-from-given-supplies
2300-construct-string-with-repeat-limit
2308-divide-array-into-equal-pairs
2356-largest-combination-with-bitwise-and-greater-than-zero
2448-count-number-of-bad-pairs
2520-using-a-robot-to-print-the-lexicographically-smallest-string
2581-divide-players-into-teams-of-equal-skill
2586-longest-square-streak-in-an-array
2599-take-k-of-each-character-from-left-and-right
2626-count-the-number-of-good-subarrays
2685-first-completely-painted-row-or-column
2766-find-the-prefix-common-array-of-two-arrays
2888-minimum-index-of-a-valid-split
3227-find-missing-and-repeated-values
3267-find-longest-special-substring-that-occurs-thrice-i
3276-minimum-number-of-pushes-to-type-word-ii
3329-find-the-length-of-the-longest-common-prefix
3360-minimum-deletions-to-make-string-k-special
3445-lexicographically-minimum-string-after-removing-stars
3455-minimum-length-of-string-after-operations
3501-delete-nodes-from-linked-list-present-in-array
3569-count-of-substrings-containing-every-vowel-and-k-consonants-ii
3629-total-characters-in-string-after-transformations-i
3753-maximum-difference-between-even-and-odd-frequency-i
3754-maximum-manhattan-distance-after-k-changes

Counting

0920-uncommon-words-from-two-sentences
1160-letter-tile-possibilities
1364-tuple-with-same-product
1620-check-if-array-pairs-are-divisible-by-k
1786-count-the-number-of-consistent-strings
1915-check-if-one-string-swap-can-make-strings-equal
1986-largest-color-value-in-a-directed-graph
2140-longest-subsequence-repeated-k-times
2163-kth-distinct-string-in-an-array
2300-construct-string-with-repeat-limit
2308-divide-array-into-equal-pairs
2356-largest-combination-with-bitwise-and-greater-than-zero
2448-count-number-of-bad-pairs
2494-sum-of-prefix-scores-of-strings
3267-find-longest-special-substring-that-occurs-thrice-i
3276-minimum-number-of-pushes-to-type-word-ii
3360-minimum-deletions-to-make-string-k-special
3455-minimum-length-of-string-after-operations
3629-total-characters-in-string-after-transformations-i
3753-maximum-difference-between-even-and-odd-frequency-i
3754-maximum-manhattan-distance-after-k-changes

Greedy

0135-candy
0179-largest-number
0624-maximum-distance-in-arrays
0632-smallest-range-covering-elements-from-k-lists
0780-max-chunks-to-make-sorted
0797-rabbits-in-forest
0890-lemonade-change
0957-minimum-add-to-make-parentheses-valid
1304-longest-happy-string
2095-minimum-number-of-swaps-to-make-the-string-balanced
2140-longest-subsequence-repeated-k-times
2221-check-if-a-parentheses-string-can-be-valid
2300-construct-string-with-repeat-limit
2387-partition-array-such-that-maximum-difference-is-k
2395-longest-binary-subsequence-less-than-or-equal-to-k
2488-divide-intervals-into-minimum-number-of-groups
2509-minimize-xor
2520-using-a-robot-to-print-the-lexicographically-smallest-string
2616-maximal-score-after-applying-k-operations
2704-maximum-difference-by-remapping-a-digit
2720-minimize-the-maximum-difference-of-pairs
3143-longest-unequal-adjacent-groups-subsequence-i
3171-minimum-equal-sum-of-two-arrays-after-replacing-zeros
3195-separate-black-and-white-balls
3241-divide-array-into-arrays-with-max-difference
3276-minimum-number-of-pushes-to-type-word-ii
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

Sorting

0179-largest-number
0368-largest-divisible-subset
0539-minimum-time-difference
0632-smallest-range-covering-elements-from-k-lists
0780-max-chunks-to-make-sorted
1256-rank-transform-of-an-array
1468-check-if-n-and-its-double-exist
2160-minimum-operations-to-make-a-uni-value-grid
2179-most-beautiful-item-for-each-query
2204-find-subsequence-of-length-k-with-the-largest-sum
2215-finding-3-digit-even-numbers
2387-partition-array-such-that-maximum-difference-is-k
2488-divide-intervals-into-minimum-number-of-groups
2581-divide-players-into-teams-of-equal-skill
2586-longest-square-streak-in-an-array
2888-minimum-index-of-a-valid-split
2891-maximum-beauty-of-an-array-after-applying-operation
3219-make-lexicographically-smallest-array-by-swapping-elements
3241-divide-array-into-arrays-with-max-difference
3276-minimum-number-of-pushes-to-type-word-ii
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
3647-zero-array-transformation-iii

Matrix

0073-set-matrix-zeroes
0407-trapping-rain-water-ii
0787-sliding-puzzle
0854-making-a-large-island
0870-magic-squares-in-grid
0921-spiral-matrix-iii
0999-regions-cut-by-slashes
1402-count-square-submatrices-with-all-ones
1485-minimum-cost-to-make-at-least-one-valid-path-in-a-grid
2035-count-sub-islands
2145-grid-game
2160-minimum-operations-to-make-a-uni-value-grid
2411-spiral-matrix-iv
2685-first-completely-painted-row-or-column
2711-minimum-time-to-visit-a-cell-in-a-grid
2764-maximum-number-of-fish-in-a-grid
2794-maximum-number-of-moves-in-a-grid
3227-find-missing-and-repeated-values
3627-find-minimum-time-to-reach-last-room-i

Depth-First Search

0110-balanced-binary-tree
0386-lexicographical-numbers
0684-redundant-connection
0776-n-ary-tree-postorder-traversal
0854-making-a-large-island
0984-most-stones-removed-with-same-row-or-column
0999-regions-cut-by-slashes
1093-recover-a-tree-from-preorder-traversal
1218-lowest-common-ancestor-of-deepest-leaves
1350-remove-sub-folders-from-the-filesystem
1484-linked-list-in-binary-tree
1558-course-schedule-iv
2035-count-sub-islands
2201-valid-arrangement-of-pairs
2246-maximum-employees-to-be-invited-to-a-meeting
2438-find-closest-node-to-given-two-nodes
2545-height-of-binary-tree-after-subtree-removal-queries
2564-most-profitable-path-in-a-tree
2764-maximum-number-of-fish-in-a-grid
3439-find-minimum-diameter-after-merging-two-trees
3633-maximize-the-number-of-target-nodes-after-connecting-trees-i
3645-maximize-the-number-of-target-nodes-after-connecting-trees-ii

Breadth-First Search

0407-trapping-rain-water-ii
0684-redundant-connection
0787-sliding-puzzle
0854-making-a-large-island
0999-regions-cut-by-slashes
1218-lowest-common-ancestor-of-deepest-leaves
1484-linked-list-in-binary-tree
1485-minimum-cost-to-make-at-least-one-valid-path-in-a-grid
1558-course-schedule-iv
2035-count-sub-islands
2545-height-of-binary-tree-after-subtree-removal-queries
2558-minimum-number-of-operations-to-sort-a-binary-tree-by-level
2564-most-profitable-path-in-a-tree
2711-minimum-time-to-visit-a-cell-in-a-grid
2764-maximum-number-of-fish-in-a-grid
3439-find-minimum-diameter-after-merging-two-trees
3633-maximize-the-number-of-target-nodes-after-connecting-trees-i
3645-maximize-the-number-of-target-nodes-after-connecting-trees-ii

Union Find

0684-redundant-connection
0854-making-a-large-island
0984-most-stones-removed-with-same-row-or-column
0999-regions-cut-by-slashes
1058-lexicographically-smallest-equivalent-string
2035-count-sub-islands
2764-maximum-number-of-fish-in-a-grid
3219-make-lexicographically-smallest-array-by-swapping-elements
3348-minimum-cost-walk-in-weighted-graph

Tree

0110-balanced-binary-tree
0776-n-ary-tree-postorder-traversal
0783-search-in-a-binary-search-tree
0789-kth-largest-element-in-a-stream
0925-construct-binary-tree-from-preorder-and-postorder-traversal
1093-recover-a-tree-from-preorder-traversal
1218-lowest-common-ancestor-of-deepest-leaves
1484-linked-list-in-binary-tree
2545-height-of-binary-tree-after-subtree-removal-queries
2558-minimum-number-of-operations-to-sort-a-binary-tree-by-level
2564-most-profitable-path-in-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
3645-maximize-the-number-of-target-nodes-after-connecting-trees-ii

Design

0432-all-oone-data-structure
0729-my-calendar-i
0731-my-calendar-ii
0789-kth-largest-element-in-a-stream
1477-product-of-the-last-k-numbers
1497-design-a-stack-with-increment-operation

Binary Search Tree

0034-find-first-and-last-position-of-element-in-sorted-array
0035-search-insert-position
0069-sqrtx
0081-search-in-rotated-sorted-array-ii
0162-find-peak-element
0729-my-calendar-i
0731-my-calendar-ii
0783-search-in-a-binary-search-tree
0789-kth-largest-element-in-a-stream
0792-binary-search
1335-maximum-candies-allocated-to-k-children
1468-check-if-n-and-its-double-exist
1679-shortest-subarray-to-be-removed-to-make-array-sorted
2006-find-the-student-that-will-replace-the-chalk
2150-kth-smallest-product-of-two-sorted-arrays
2179-most-beautiful-item-for-each-query
2280-count-good-triplets-in-an-array
2394-count-subarrays-with-score-less-than-k
2586-longest-square-streak-in-an-array
2720-minimize-the-maximum-difference-of-pairs
2891-maximum-beauty-of-an-array-after-applying-operation
3267-find-longest-special-substring-that-occurs-thrice-i
3643-zero-array-transformation-ii

Heap (Priority Queue)

0264-ugly-number-ii
0407-trapping-rain-water-ii
0632-smallest-range-covering-elements-from-k-lists
0789-kth-largest-element-in-a-stream
1304-longest-happy-string
1325-path-with-maximum-probability
1485-minimum-cost-to-make-at-least-one-valid-path-in-a-grid
2054-the-number-of-the-smallest-unoccupied-chair
2204-find-subsequence-of-length-k-with-the-largest-sum
2300-construct-string-with-repeat-limit
2488-divide-intervals-into-minimum-number-of-groups
2616-maximal-score-after-applying-k-operations
2711-minimum-time-to-visit-a-cell-in-a-grid
3445-lexicographically-minimum-string-after-removing-stars
3555-final-array-state-after-k-multiplication-operations-i
3627-find-minimum-time-to-reach-last-room-i
3647-zero-array-transformation-iii

Binary Tree

0110-balanced-binary-tree
0783-search-in-a-binary-search-tree
0789-kth-largest-element-in-a-stream
0925-construct-binary-tree-from-preorder-and-postorder-traversal
1093-recover-a-tree-from-preorder-traversal
1218-lowest-common-ancestor-of-deepest-leaves
1484-linked-list-in-binary-tree
2545-height-of-binary-tree-after-subtree-removal-queries
2558-minimum-number-of-operations-to-sort-a-binary-tree-by-level

Data Stream

0789-kth-largest-element-in-a-stream
1477-product-of-the-last-k-numbers

Backtracking

0040-combination-sum-ii
0494-target-sum
1160-letter-tile-possibilities
1516-the-k-th-lexicographical-string-of-all-happy-strings-of-length-n
1715-split-a-string-into-the-max-number-of-unique-substrings
1819-construct-the-lexicographically-largest-valid-sequence
1993-sum-of-all-subset-xor-totals
2140-longest-subsequence-repeated-k-times
2802-find-the-punishment-number-of-an-integer

Dynamic Programming

0241-different-ways-to-add-parentheses
0264-ugly-number-ii
0368-largest-divisible-subset
0494-target-sum
0650-2-keys-keyboard
0664-strange-printer
0689-maximum-sum-of-3-non-overlapping-subarrays
0868-push-dominoes
0905-length-of-longest-fibonacci-subsequence
0909-stone-game
1170-shortest-common-supersequence
1240-stone-game-ii
1402-count-square-submatrices-with-all-ones
1631-number-of-sub-arrays-with-odd-sum
1744-number-of-ways-to-form-a-target-string-given-a-dictionary
1849-maximum-absolute-sum-of-any-subarray
1986-largest-color-value-in-a-directed-graph
2061-painting-a-grid-with-three-different-colors
2090-number-of-ways-to-arrive-at-destination
2262-solving-questions-with-brainpower
2395-longest-binary-subsequence-less-than-or-equal-to-k
2562-count-ways-to-build-good-strings
2586-longest-square-streak-in-an-array
2794-maximum-number-of-moves-in-a-grid
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
3629-total-characters-in-string-after-transformations-i
3637-count-number-of-balanced-permutations

Game Theory

0909-stone-game
1240-stone-game-ii

Prefix Sum

0731-my-calendar-ii
1240-stone-game-ii
1435-xor-queries-of-a-subarray
1473-find-the-longest-substring-containing-vowels-in-even-counts
1477-product-of-the-last-k-numbers
1537-maximum-score-after-splitting-a-string
1631-number-of-sub-arrays-with-odd-sum
1694-make-sum-divisible-by-p
1895-minimum-number-of-operations-to-move-all-balls-to-each-box
1940-maximum-xor-for-each-query
2006-find-the-student-that-will-replace-the-chalk
2059-unique-length-3-palindromic-subsequences
2145-grid-game
2394-count-subarrays-with-score-less-than-k
2465-shifting-letters-ii
2488-divide-intervals-into-minimum-number-of-groups
2691-count-vowel-strings-in-ranges
3475-minimum-operations-to-make-binary-array-elements-equal-to-one-i
3643-zero-array-transformation-ii
3647-zero-array-transformation-iii
3761-maximum-difference-between-even-and-odd-frequency-ii

Bit Manipulation

0476-number-complement
1435-xor-queries-of-a-subarray
1473-find-the-longest-substring-containing-vowels-in-even-counts
1786-count-the-number-of-consistent-strings
1940-maximum-xor-for-each-query
1993-sum-of-all-subset-xor-totals
2059-unique-length-3-palindromic-subsequences
2308-divide-array-into-equal-pairs
2323-minimum-bit-flips-to-convert-number
2356-largest-combination-with-bitwise-and-greater-than-zero
2509-minimize-xor
2533-bitwise-xor-of-all-pairings
2766-find-the-prefix-common-array-of-two-arrays
2792-neighboring-bitwise-xor
3307-find-the-maximum-sum-of-node-values
3348-minimum-cost-walk-in-weighted-graph
3380-shortest-subarray-with-or-at-least-k-ii
3394-minimum-array-end
3475-minimum-operations-to-make-binary-array-elements-equal-to-one-i

Graph

0684-redundant-connection
0984-most-stones-removed-with-same-row-or-column
1325-path-with-maximum-probability
1485-minimum-cost-to-make-at-least-one-valid-path-in-a-grid
1558-course-schedule-iv
1986-largest-color-value-in-a-directed-graph
2090-number-of-ways-to-arrive-at-destination
2201-valid-arrangement-of-pairs
2220-find-all-possible-recipes-from-given-supplies
2246-maximum-employees-to-be-invited-to-a-meeting
2438-find-closest-node-to-given-two-nodes
2564-most-profitable-path-in-a-tree
2711-minimum-time-to-visit-a-cell-in-a-grid
3189-find-champion-ii
3348-minimum-cost-walk-in-weighted-graph
3439-find-minimum-diameter-after-merging-two-trees
3627-find-minimum-time-to-reach-last-room-i

Shortest Path

1325-path-with-maximum-probability
1485-minimum-cost-to-make-at-least-one-valid-path-in-a-grid
2090-number-of-ways-to-arrive-at-destination
2711-minimum-time-to-visit-a-cell-in-a-grid
3627-find-minimum-time-to-reach-last-room-i

Linked List

0141-linked-list-cycle
0432-all-oone-data-structure
0725-split-linked-list-in-parts
1484-linked-list-in-binary-tree
2411-spiral-matrix-iv
2903-insert-greatest-common-divisors-in-linked-list
3501-delete-nodes-from-linked-list-present-in-array

Two Pointers

0141-linked-list-cycle
0345-reverse-vowels-of-a-string
0567-permutation-in-string
0868-push-dominoes
1468-check-if-n-and-its-double-exist
1566-check-if-a-word-occurs-as-a-prefix-of-any-word-in-a-sentence
1679-shortest-subarray-to-be-removed-to-make-array-sorted
1923-sentence-similarity-iii
2095-minimum-number-of-swaps-to-make-the-string-balanced
2232-adding-spaces-to-a-string
2488-divide-intervals-into-minimum-number-of-groups
2551-apply-operations-to-an-array
2581-divide-players-into-teams-of-equal-skill
3018-make-string-a-subsequence-using-cyclic-increments
3195-separate-black-and-white-balls

Memoization

0241-different-ways-to-add-parentheses
1986-largest-color-value-in-a-directed-graph
2395-longest-binary-subsequence-less-than-or-equal-to-k

Trie

0386-lexicographical-numbers
0440-k-th-smallest-in-lexicographical-order
1350-remove-sub-folders-from-the-filesystem
2494-sum-of-prefix-scores-of-strings
3309-count-prefix-and-suffix-pairs-i
3329-find-the-length-of-the-longest-common-prefix

Segment Tree

0729-my-calendar-i
0731-my-calendar-ii
2280-count-good-triplets-in-an-array

Ordered Set

0729-my-calendar-i
0731-my-calendar-ii
2280-count-good-triplets-in-an-array

Doubly-Linked List

0432-all-oone-data-structure

Sliding Window

0567-permutation-in-string
0632-smallest-range-covering-elements-from-k-lists
1460-number-of-substrings-containing-all-three-characters
1755-defuse-the-bomb
2394-count-subarrays-with-score-less-than-k
2599-take-k-of-each-character-from-left-and-right
2626-count-the-number-of-good-subarrays
2891-maximum-beauty-of-an-array-after-applying-operation
3267-find-longest-special-substring-that-occurs-thrice-i
3380-shortest-subarray-with-or-at-least-k-ii
3475-minimum-operations-to-make-binary-array-elements-equal-to-one-i
3569-count-of-substrings-containing-every-vowel-and-k-consonants-ii
3761-maximum-difference-between-even-and-odd-frequency-ii

Monotonic Stack

0780-max-chunks-to-make-sorted
1679-shortest-subarray-to-be-removed-to-make-array-sorted

Database

0176-second-highest-salary
0178-rank-scores
0180-consecutive-numbers
0262-trips-and-users
0601-human-traffic-of-stadium
0608-tree-node
1153-product-sales-analysis-i
1174-sales-analysis-iii
1452-restaurant-growth
1480-movie-rating
1509-replace-employee-id-with-the-unique-identifier
1523-capital-gainloss
1625-group-sold-products-by-the-date
1664-find-users-with-valid-e-mails
1670-patients-with-a-condition
1724-customer-who-visited-but-did-not-make-any-transactions
1734-bank-account-summary-ii
1773-percentage-of-users-attended-a-contest
1801-average-time-of-process-per-machine
1811-fix-names-in-a-table
1827-invalid-tweets
1837-daily-leads-and-partners
1877-find-followers-count
1882-the-number-of-employees-which-report-to-each-employee
1892-find-total-time-spent-by-each-employee
1908-recyclable-and-low-fat-products
1942-primary-department-for-each-employee
2057-count-salary-categories
2087-confirmation-rate
2127-employees-whose-manager-left-the-company
2495-number-of-unique-subjects-taught-by-each-teacher

Eulerian Circuit

2201-valid-arrangement-of-pairs

String Matching

1566-check-if-a-word-occurs-as-a-prefix-of-any-word-in-a-sentence
3309-count-prefix-and-suffix-pairs-i

Rolling Hash

3309-count-prefix-and-suffix-pairs-i

Hash Function

3309-count-prefix-and-suffix-pairs-i

Brainteaser

2533-bitwise-xor-of-all-pairings

Topological Sort

1558-course-schedule-iv
1986-largest-color-value-in-a-directed-graph
2090-number-of-ways-to-arrive-at-destination
2220-find-all-possible-recipes-from-given-supplies
2246-maximum-employees-to-be-invited-to-a-meeting

Divide and Conquer

0925-construct-binary-tree-from-preorder-and-postorder-traversal
2280-count-good-triplets-in-an-array

Combinatorics

1993-sum-of-all-subset-xor-totals
3201-distribute-candies-among-children-ii
3637-count-number-of-balanced-permutations
3682-count-the-number-of-arrays-with-k-matching-adjacent-elements

Enumeration

1993-sum-of-all-subset-xor-totals
2140-longest-subsequence-repeated-k-times
2202-sum-of-k-mirror-numbers
2215-finding-3-digit-even-numbers
2998-count-symmetric-integers
3201-distribute-candies-among-children-ii
3761-maximum-difference-between-even-and-odd-frequency-ii

Binary Indexed Tree

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

Merge Sort

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