LeetCode-Solutions

Created using LeetHub

Array

0075-sort-colors
0330-patching-array
0502-ipo
0853-most-profit-assigning-work
0982-minimum-increment-to-make-array-unique
1137-height-checker
1138-grumpy-bookstore-owner
1217-relative-sort-array
1370-count-number-of-nice-subarrays
1549-longest-continuous-subarray-with-absolute-diff-less-than-or-equal-to-limit
1605-minimum-number-of-days-to-make-m-bouquets
1675-magnetic-force-between-two-balls
2148-minimum-number-of-moves-to-seat-everyone
3231-minimum-number-of-coins-to-be-added

Sorting

0075-sort-colors
0502-ipo
0853-most-profit-assigning-work
0982-minimum-increment-to-make-array-unique
1137-height-checker
1217-relative-sort-array
1675-magnetic-force-between-two-balls
2148-minimum-number-of-moves-to-seat-everyone
3231-minimum-number-of-coins-to-be-added

Counting Sort

0982-minimum-increment-to-make-array-unique
1137-height-checker
1217-relative-sort-array

Hash Table

1217-relative-sort-array
1370-count-number-of-nice-subarrays

Two Pointers

0075-sort-colors
0633-sum-of-square-numbers
0853-most-profit-assigning-work

Greedy

0330-patching-array
0502-ipo
0853-most-profit-assigning-work
0982-minimum-increment-to-make-array-unique
1285-balance-a-binary-search-tree
2148-minimum-number-of-moves-to-seat-everyone
3231-minimum-number-of-coins-to-be-added

Heap (Priority Queue)

0502-ipo
1549-longest-continuous-subarray-with-absolute-diff-less-than-or-equal-to-limit

Math

0633-sum-of-square-numbers
0668-kth-smallest-number-in-multiplication-table
1370-count-number-of-nice-subarrays

Binary Search

0633-sum-of-square-numbers
0668-kth-smallest-number-in-multiplication-table
0853-most-profit-assigning-work
1605-minimum-number-of-days-to-make-m-bouquets
1675-magnetic-force-between-two-balls

String

0488-zuma-game

Dynamic Programming

0488-zuma-game

Stack

0488-zuma-game

Breadth-First Search

0488-zuma-game

Memoization

0488-zuma-game

Sliding Window

1138-grumpy-bookstore-owner
1370-count-number-of-nice-subarrays
1549-longest-continuous-subarray-with-absolute-diff-less-than-or-equal-to-limit

Queue

1549-longest-continuous-subarray-with-absolute-diff-less-than-or-equal-to-limit

Ordered Set

1549-longest-continuous-subarray-with-absolute-diff-less-than-or-equal-to-limit

Monotonic Queue

1549-longest-continuous-subarray-with-absolute-diff-less-than-or-equal-to-limit

Tree

1114-binary-search-tree-to-greater-sum-tree
1285-balance-a-binary-search-tree

Depth-First Search

1114-binary-search-tree-to-greater-sum-tree
1285-balance-a-binary-search-tree

Binary Search Tree

1114-binary-search-tree-to-greater-sum-tree
1285-balance-a-binary-search-tree

Binary Tree

1114-binary-search-tree-to-greater-sum-tree
1285-balance-a-binary-search-tree

Divide and Conquer

1285-balance-a-binary-search-tree

Graph

1916-find-center-of-star-graph

LeetCode Topics

Depth-First Search

0133-clone-graph
0200-number-of-islands
0207-course-schedule
0210-course-schedule-ii
0236-lowest-common-ancestor-of-a-binary-tree
0365-water-and-jug-problem
0386-lexicographical-numbers
0515-find-largest-value-in-each-tree-row
0690-employee-importance
0770-couples-holding-hands
0776-n-ary-tree-postorder-traversal
0803-cheapest-flights-within-k-stops
0964-minimize-malware-spread-ii
0988-flip-equivalent-binary-trees
0999-regions-cut-by-slashes
1008-binary-tree-cameras
1431-all-ancestors-of-a-node-in-a-directed-acyclic-graph
1442-number-of-operations-to-make-network-connected
1653-number-of-good-leaf-nodes-pairs
1663-detect-cycles-in-2d-grid
2035-count-sub-islands
2201-valid-arrangement-of-pairs
2217-step-by-step-directions-from-a-binary-tree-node-to-another
2493-reverse-odd-levels-of-binary-tree
2677-cousins-in-binary-tree-ii
3058-maximum-number-of-k-divisible-components
3439-find-minimum-diameter-after-merging-two-trees
3633-maximize-the-number-of-target-nodes-after-connecting-trees-i

Breadth-First Search

0127-word-ladder
0133-clone-graph
0200-number-of-islands
0207-course-schedule
0210-course-schedule-ii
0365-water-and-jug-problem
0515-find-largest-value-in-each-tree-row
0690-employee-importance
0770-couples-holding-hands
0787-sliding-puzzle
0803-cheapest-flights-within-k-stops
0964-minimize-malware-spread-ii
0999-regions-cut-by-slashes
1036-rotting-oranges
1431-all-ancestors-of-a-node-in-a-directed-acyclic-graph
1442-number-of-operations-to-make-network-connected
1663-detect-cycles-in-2d-grid
2035-count-sub-islands
2171-second-minimum-time-to-reach-destination
2375-minimum-obstacle-removal-to-reach-corner
2493-reverse-odd-levels-of-binary-tree
2646-kth-largest-sum-in-a-binary-tree
2677-cousins-in-binary-tree-ii
2711-minimum-time-to-visit-a-cell-in-a-grid
3439-find-minimum-diameter-after-merging-two-trees
3517-shortest-distance-after-road-addition-queries-i
3633-maximize-the-number-of-target-nodes-after-connecting-trees-i

Graph

0133-clone-graph
0207-course-schedule
0210-course-schedule-ii
0770-couples-holding-hands
0803-cheapest-flights-within-k-stops
0964-minimize-malware-spread-ii
1325-path-with-maximum-probability
1431-all-ancestors-of-a-node-in-a-directed-acyclic-graph
1442-number-of-operations-to-make-network-connected
1456-find-the-city-with-the-smallest-number-of-neighbors-at-a-threshold-distance
1701-remove-max-number-of-edges-to-keep-graph-fully-traversable
1706-min-cost-to-connect-all-points
2171-second-minimum-time-to-reach-destination
2201-valid-arrangement-of-pairs
2220-find-all-possible-recipes-from-given-supplies
2375-minimum-obstacle-removal-to-reach-corner
2472-build-a-matrix-with-conditions
2711-minimum-time-to-visit-a-cell-in-a-grid
2803-modify-graph-edge-weights
3189-find-champion-ii
3235-minimum-cost-to-convert-string-i
3439-find-minimum-diameter-after-merging-two-trees
3517-shortest-distance-after-road-addition-queries-i
3627-find-minimum-time-to-reach-last-room-i

Topological Sort

0207-course-schedule
0210-course-schedule-ii
1431-all-ancestors-of-a-node-in-a-directed-acyclic-graph
2220-find-all-possible-recipes-from-given-supplies
2472-build-a-matrix-with-conditions

Union Find

0200-number-of-islands
0770-couples-holding-hands
0964-minimize-malware-spread-ii
0989-largest-component-size-by-common-factor
0999-regions-cut-by-slashes
1058-lexicographically-smallest-equivalent-string
1442-number-of-operations-to-make-network-connected
1663-detect-cycles-in-2d-grid
1701-remove-max-number-of-edges-to-keep-graph-fully-traversable
1706-min-cost-to-connect-all-points
2035-count-sub-islands

Array

0033-search-in-rotated-sorted-array
0040-combination-sum-ii
0056-merge-intervals
0079-word-search
0137-single-number-ii
0179-largest-number
0188-best-time-to-buy-and-sell-stock-iv
0200-number-of-islands
0212-word-search-ii
0240-search-a-2d-matrix-ii
0300-longest-increasing-subsequence
0312-burst-balloons
0336-palindrome-pairs
0494-target-sum
0539-minimum-time-difference
0540-single-element-in-a-sorted-array
0624-maximum-distance-in-arrays
0689-maximum-sum-of-3-non-overlapping-subarrays
0690-employee-importance
0719-find-k-th-smallest-pair-distance
0729-my-calendar-i
0731-my-calendar-ii
0780-max-chunks-to-make-sorted
0787-sliding-puzzle
0870-magic-squares-in-grid
0890-lemonade-change
0892-shortest-subarray-with-sum-at-least-k
0906-walking-robot-simulation
0921-spiral-matrix-iii
0948-sort-an-array
0964-minimize-malware-spread-ii
0989-largest-component-size-by-common-factor
0999-regions-cut-by-slashes
1002-maximum-width-ramp
1017-odd-even-jump
1036-rotting-oranges
1063-best-sightseeing-pair
1147-flip-columns-for-maximum-number-of-equal-rows
1240-stone-game-ii
1256-rank-transform-of-an-array
1293-three-consecutive-odds
1325-path-with-maximum-probability
1333-sort-the-jumbled-numbers
1435-xor-queries-of-a-subarray
1468-check-if-n-and-its-double-exist
1496-lucky-numbers-in-a-matrix
1511-count-number-of-teams
1524-string-matching-in-an-array
1616-minimum-difference-between-largest-and-smallest-value-in-three-moves
1620-check-if-array-pairs-are-divisible-by-k
1663-detect-cycles-in-2d-grid
1679-shortest-subarray-to-be-removed-to-make-array-sorted
1694-make-sum-divisible-by-p
1706-min-cost-to-connect-all-points
1711-find-valid-matrix-given-row-and-column-sums
1720-crawler-log-folder
1744-number-of-ways-to-form-a-target-string-given-a-dictionary
1755-defuse-the-bomb
1895-minimum-number-of-operations-to-move-all-balls-to-each-box
1917-maximum-average-pass-ratio
1923-sentence-similarity-iii
1951-find-the-winner-of-the-circular-game
1962-single-threaded-cpu
2006-find-the-student-that-will-replace-the-chalk
2035-count-sub-islands
2054-the-number-of-the-smallest-unoccupied-chair
2067-maximum-number-of-points-with-cost
2132-convert-1d-array-into-2d-array
2155-find-missing-observations
2163-kth-distinct-string-in-an-array
2164-two-best-non-overlapping-events
2170-count-number-of-maximum-bitwise-or-subsets
2179-most-beautiful-item-for-each-query
2188-minimized-maximum-of-products-distributed-to-any-store
2220-find-all-possible-recipes-from-given-supplies
2255-minimum-swaps-to-group-all-1s-together-ii
2306-create-binary-tree-from-descriptions
2356-largest-combination-with-bitwise-and-greater-than-zero
2375-minimum-obstacle-removal-to-reach-corner
2411-spiral-matrix-iv
2465-shifting-letters-ii
2472-build-a-matrix-with-conditions
2488-divide-intervals-into-minimum-number-of-groups
2494-sum-of-prefix-scores-of-strings
2502-sort-the-people
2503-longest-subarray-with-maximum-bitwise-and
2552-maximum-sum-of-distinct-subarrays-with-length-k
2554-minimum-total-distance-traveled
2581-divide-players-into-teams-of-equal-skill
2586-longest-square-streak-in-an-array
2616-maximal-score-after-applying-k-operations
2640-maximum-number-of-integers-to-choose-from-a-range-i
2691-count-vowel-strings-in-ranges
2695-find-score-of-an-array-after-marking-all-elements
2699-count-the-number-of-fair-pairs
2711-minimum-time-to-visit-a-cell-in-a-grid
2716-prime-subtraction-operation
2755-extra-characters-in-a-string
2794-maximum-number-of-moves-in-a-grid
2846-robot-collisions
2868-continuous-subarrays
2891-maximum-beauty-of-an-array-after-applying-operation
3181-find-building-where-alice-and-bob-can-meet
3235-minimum-cost-to-convert-string-i
3291-find-if-array-can-be-sorted
3329-find-the-length-of-the-longest-common-prefix
3427-special-array-ii
3501-delete-nodes-from-linked-list-present-in-array
3517-shortest-distance-after-road-addition-queries-i
3522-find-the-power-of-k-size-subarrays-i
3523-find-the-power-of-k-size-subarrays-ii
3528-reach-end-of-array-with-max-score
3555-final-array-state-after-k-multiplication-operations-i
3622-maximum-frequency-of-an-element-after-performing-operations-i
3627-find-minimum-time-to-reach-last-room-i
3640-maximum-frequency-of-an-element-after-performing-operations-ii
3646-sum-of-good-subsequences

Dynamic Programming

0072-edit-distance
0188-best-time-to-buy-and-sell-stock-iv
0241-different-ways-to-add-parentheses
0264-ugly-number-ii
0300-longest-increasing-subsequence
0312-burst-balloons
0338-counting-bits
0494-target-sum
0516-longest-palindromic-subsequence
0650-2-keys-keyboard
0664-strange-printer
0689-maximum-sum-of-3-non-overlapping-subarrays
0803-cheapest-flights-within-k-stops
1008-binary-tree-cameras
1017-odd-even-jump
1063-best-sightseeing-pair
1240-stone-game-ii
1250-longest-common-subsequence
1456-find-the-city-with-the-smallest-number-of-neighbors-at-a-threshold-distance
1511-count-number-of-teams
1744-number-of-ways-to-form-a-target-string-given-a-dictionary
1756-minimum-deletions-to-make-string-balanced
2067-maximum-number-of-points-with-cost
2164-two-best-non-overlapping-events
2554-minimum-total-distance-traveled
2586-longest-square-streak-in-an-array
2755-extra-characters-in-a-string
2794-maximum-number-of-moves-in-a-grid
3646-sum-of-good-subsequences

Greedy

0179-largest-number
0624-maximum-distance-in-arrays
0670-maximum-swap
0770-couples-holding-hands
0780-max-chunks-to-make-sorted
0890-lemonade-change
0957-minimum-add-to-make-parentheses-valid
1304-longest-happy-string
1616-minimum-difference-between-largest-and-smallest-value-in-three-moves
1711-find-valid-matrix-given-row-and-column-sums
1818-maximum-score-from-removing-substrings
1917-maximum-average-pass-ratio
2095-minimum-number-of-swaps-to-make-the-string-balanced
2300-construct-string-with-repeat-limit
2488-divide-intervals-into-minimum-number-of-groups
2616-maximal-score-after-applying-k-operations
2640-maximum-number-of-integers-to-choose-from-a-range-i
2716-prime-subtraction-operation
3195-separate-black-and-white-balls
3276-minimum-number-of-pushes-to-type-word-ii
3528-reach-end-of-array-with-max-score

Sorting

0056-merge-intervals
0179-largest-number
0539-minimum-time-difference
0719-find-k-th-smallest-pair-distance
0726-number-of-atoms
0780-max-chunks-to-make-sorted
0948-sort-an-array
1256-rank-transform-of-an-array
1333-sort-the-jumbled-numbers
1468-check-if-n-and-its-double-exist
1616-minimum-difference-between-largest-and-smallest-value-in-three-moves
1962-single-threaded-cpu
2164-two-best-non-overlapping-events
2179-most-beautiful-item-for-each-query
2488-divide-intervals-into-minimum-number-of-groups
2502-sort-the-people
2554-minimum-total-distance-traveled
2581-divide-players-into-teams-of-equal-skill
2586-longest-square-streak-in-an-array
2640-maximum-number-of-integers-to-choose-from-a-range-i
2646-kth-largest-sum-in-a-binary-tree
2695-find-score-of-an-array-after-marking-all-elements
2699-count-the-number-of-fair-pairs
2846-robot-collisions
2891-maximum-beauty-of-an-array-after-applying-operation
3276-minimum-number-of-pushes-to-type-word-ii
3291-find-if-array-can-be-sorted
3622-maximum-frequency-of-an-element-after-performing-operations-i
3640-maximum-frequency-of-an-element-after-performing-operations-ii

Linked List

0023-merge-k-sorted-lists
0432-all-oone-data-structure
0725-split-linked-list-in-parts
1337-design-skiplist
2182-find-the-minimum-and-maximum-number-of-nodes-between-critical-points
2299-merge-nodes-in-between-zeros
2411-spiral-matrix-iv
2903-insert-greatest-common-divisors-in-linked-list
3501-delete-nodes-from-linked-list-present-in-array

Simulation

0906-walking-robot-simulation
0921-spiral-matrix-iii
1642-water-bottles
1667-find-kth-bit-in-nth-binary-string
1951-find-the-winner-of-the-circular-game
2006-find-the-student-that-will-replace-the-chalk
2076-sum-of-digits-of-string-after-convert
2132-convert-1d-array-into-2d-array
2155-find-missing-observations
2299-merge-nodes-in-between-zeros
2411-spiral-matrix-iv
2645-pass-the-pillow
2695-find-score-of-an-array-after-marking-all-elements
2800-minimum-string-length-after-removing-substrings
2846-robot-collisions
3555-final-array-state-after-k-multiplication-operations-i

Math

0029-divide-two-integers
0241-different-ways-to-add-parentheses
0264-ugly-number-ii
0365-water-and-jug-problem
0539-minimum-time-difference
0564-find-the-closest-palindrome
0650-2-keys-keyboard
0670-maximum-swap
0870-magic-squares-in-grid
0989-largest-component-size-by-common-factor
1240-stone-game-ii
1642-water-bottles
1951-find-the-winner-of-the-circular-game
2155-find-missing-observations
2645-pass-the-pillow
2716-prime-subtraction-operation
2903-insert-greatest-common-divisors-in-linked-list
3555-final-array-state-after-k-multiplication-operations-i

Binary Search

0033-search-in-rotated-sorted-array
0240-search-a-2d-matrix-ii
0300-longest-increasing-subsequence
0540-single-element-in-a-sorted-array
0719-find-k-th-smallest-pair-distance
0729-my-calendar-i
0731-my-calendar-ii
0732-my-calendar-iii
0892-shortest-subarray-with-sum-at-least-k
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
2164-two-best-non-overlapping-events
2179-most-beautiful-item-for-each-query
2188-minimized-maximum-of-products-distributed-to-any-store
2586-longest-square-streak-in-an-array
2640-maximum-number-of-integers-to-choose-from-a-range-i
2699-count-the-number-of-fair-pairs
2716-prime-subtraction-operation
2891-maximum-beauty-of-an-array-after-applying-operation
3181-find-building-where-alice-and-bob-can-meet
3267-find-longest-special-substring-that-occurs-thrice-i
3427-special-array-ii
3622-maximum-frequency-of-an-element-after-performing-operations-i
3640-maximum-frequency-of-an-element-after-performing-operations-ii

Design

0208-implement-trie-prefix-tree
0432-all-oone-data-structure
0715-range-module
0729-my-calendar-i
0731-my-calendar-ii
0732-my-calendar-iii
0789-kth-largest-element-in-a-stream
1337-design-skiplist
1953-finding-mk-average

Segment Tree

0715-range-module
0729-my-calendar-i
0731-my-calendar-ii
0732-my-calendar-iii
3181-find-building-where-alice-and-bob-can-meet

Prefix Sum

0731-my-calendar-ii
0732-my-calendar-iii
0892-shortest-subarray-with-sum-at-least-k
1240-stone-game-ii
1435-xor-queries-of-a-subarray
1473-find-the-longest-substring-containing-vowels-in-even-counts
1694-make-sum-divisible-by-p
1895-minimum-number-of-operations-to-move-all-balls-to-each-box
2006-find-the-student-that-will-replace-the-chalk
2059-unique-length-3-palindromic-subsequences
2465-shifting-letters-ii
2488-divide-intervals-into-minimum-number-of-groups
2691-count-vowel-strings-in-ranges
3427-special-array-ii
3622-maximum-frequency-of-an-element-after-performing-operations-i
3640-maximum-frequency-of-an-element-after-performing-operations-ii

Ordered Set

0715-range-module
0729-my-calendar-i
0731-my-calendar-ii
0732-my-calendar-iii
1017-odd-even-jump
1953-finding-mk-average
2868-continuous-subarrays

Hash Table

0017-letter-combinations-of-a-phone-number
0127-word-ladder
0133-clone-graph
0208-implement-trie-prefix-tree
0264-ugly-number-ii
0336-palindrome-pairs
0432-all-oone-data-structure
0690-employee-importance
0726-number-of-atoms
0870-magic-squares-in-grid
0906-walking-robot-simulation
0920-uncommon-words-from-two-sentences
0964-minimize-malware-spread-ii
0989-largest-component-size-by-common-factor
0999-regions-cut-by-slashes
1147-flip-columns-for-maximum-number-of-equal-rows
1256-rank-transform-of-an-array
1468-check-if-n-and-its-double-exist
1473-find-the-longest-substring-containing-vowels-in-even-counts
1620-check-if-array-pairs-are-divisible-by-k
1694-make-sum-divisible-by-p
2054-the-number-of-the-smallest-unoccupied-chair
2059-unique-length-3-palindromic-subsequences
2163-kth-distinct-string-in-an-array
2220-find-all-possible-recipes-from-given-supplies
2300-construct-string-with-repeat-limit
2306-create-binary-tree-from-descriptions
2356-largest-combination-with-bitwise-and-greater-than-zero
2502-sort-the-people
2552-maximum-sum-of-distinct-subarrays-with-length-k
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
2640-maximum-number-of-integers-to-choose-from-a-range-i
2677-cousins-in-binary-tree-ii
2695-find-score-of-an-array-after-marking-all-elements
2755-extra-characters-in-a-string
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
3501-delete-nodes-from-linked-list-present-in-array
3646-sum-of-good-subsequences

String

0017-letter-combinations-of-a-phone-number
0072-edit-distance
0079-word-search
0127-word-ladder
0179-largest-number
0208-implement-trie-prefix-tree
0212-word-search-ii
0241-different-ways-to-add-parentheses
0336-palindrome-pairs
0394-decode-string
0516-longest-palindromic-subsequence
0539-minimum-time-difference
0564-find-the-closest-palindrome
0664-strange-printer
0726-number-of-atoms
0812-rotate-string
0920-uncommon-words-from-two-sentences
0957-minimum-add-to-make-parentheses-valid
1058-lexicographically-smallest-equivalent-string
1197-parsing-a-boolean-expression
1250-longest-common-subsequence
1298-reverse-substrings-between-each-pair-of-parentheses
1302-delete-characters-to-make-fancy-string
1304-longest-happy-string
1473-find-the-longest-substring-containing-vowels-in-even-counts
1524-string-matching-in-an-array
1566-check-if-a-word-occurs-as-a-prefix-of-any-word-in-a-sentence
1667-find-kth-bit-in-nth-binary-string
1720-crawler-log-folder
1744-number-of-ways-to-form-a-target-string-given-a-dictionary
1756-minimum-deletions-to-make-string-balanced
1818-maximum-score-from-removing-substrings
1895-minimum-number-of-operations-to-move-all-balls-to-each-box
1923-sentence-similarity-iii
2059-unique-length-3-palindromic-subsequences
2076-sum-of-digits-of-string-after-convert
2095-minimum-number-of-swaps-to-make-the-string-balanced
2163-kth-distinct-string-in-an-array
2217-step-by-step-directions-from-a-binary-tree-node-to-another
2220-find-all-possible-recipes-from-given-supplies
2300-construct-string-with-repeat-limit
2414-move-pieces-to-obtain-a-string
2465-shifting-letters-ii
2494-sum-of-prefix-scores-of-strings
2502-sort-the-people
2580-circular-sentence
2599-take-k-of-each-character-from-left-and-right
2691-count-vowel-strings-in-ranges
2755-extra-characters-in-a-string
2800-minimum-string-length-after-removing-substrings
3174-minimum-number-of-changes-to-make-binary-string-beautiful
3195-separate-black-and-white-balls
3235-minimum-cost-to-convert-string-i
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
3451-string-compression-iii

Recursion

0241-different-ways-to-add-parentheses
0394-decode-string
1197-parsing-a-boolean-expression
1667-find-kth-bit-in-nth-binary-string
1951-find-the-winner-of-the-circular-game

Queue

0892-shortest-subarray-with-sum-at-least-k
1951-find-the-winner-of-the-circular-game
1953-finding-mk-average
2868-continuous-subarrays

Stack

0394-decode-string
0726-number-of-atoms
0776-n-ary-tree-postorder-traversal
0780-max-chunks-to-make-sorted
0957-minimum-add-to-make-parentheses-valid
1002-maximum-width-ramp
1017-odd-even-jump
1197-parsing-a-boolean-expression
1298-reverse-substrings-between-each-pair-of-parentheses
1679-shortest-subarray-to-be-removed-to-make-array-sorted
1720-crawler-log-folder
1756-minimum-deletions-to-make-string-balanced
1818-maximum-score-from-removing-substrings
2095-minimum-number-of-swaps-to-make-the-string-balanced
2800-minimum-string-length-after-removing-substrings
2846-robot-collisions
3181-find-building-where-alice-and-bob-can-meet

Tree

0236-lowest-common-ancestor-of-a-binary-tree
0515-find-largest-value-in-each-tree-row
0690-employee-importance
0776-n-ary-tree-postorder-traversal
0789-kth-largest-element-in-a-stream
0988-flip-equivalent-binary-trees
1008-binary-tree-cameras
1653-number-of-good-leaf-nodes-pairs
2217-step-by-step-directions-from-a-binary-tree-node-to-another
2306-create-binary-tree-from-descriptions
2493-reverse-odd-levels-of-binary-tree
2646-kth-largest-sum-in-a-binary-tree
2677-cousins-in-binary-tree-ii
3058-maximum-number-of-k-divisible-components
3439-find-minimum-diameter-after-merging-two-trees
3633-maximize-the-number-of-target-nodes-after-connecting-trees-i

Binary Tree

0236-lowest-common-ancestor-of-a-binary-tree
0515-find-largest-value-in-each-tree-row
0789-kth-largest-element-in-a-stream
0988-flip-equivalent-binary-trees
1008-binary-tree-cameras
1653-number-of-good-leaf-nodes-pairs
2217-step-by-step-directions-from-a-binary-tree-node-to-another
2306-create-binary-tree-from-descriptions
2493-reverse-odd-levels-of-binary-tree
2646-kth-largest-sum-in-a-binary-tree
2677-cousins-in-binary-tree-ii

Matrix

0079-word-search
0200-number-of-islands
0212-word-search-ii
0240-search-a-2d-matrix-ii
0787-sliding-puzzle
0870-magic-squares-in-grid
0921-spiral-matrix-iii
0999-regions-cut-by-slashes
1036-rotting-oranges
1147-flip-columns-for-maximum-number-of-equal-rows
1496-lucky-numbers-in-a-matrix
1663-detect-cycles-in-2d-grid
1711-find-valid-matrix-given-row-and-column-sums
2035-count-sub-islands
2132-convert-1d-array-into-2d-array
2375-minimum-obstacle-removal-to-reach-corner
2411-spiral-matrix-iv
2472-build-a-matrix-with-conditions
2711-minimum-time-to-visit-a-cell-in-a-grid
2794-maximum-number-of-moves-in-a-grid
3627-find-minimum-time-to-reach-last-room-i

Divide and Conquer

0023-merge-k-sorted-lists
0240-search-a-2d-matrix-ii
0948-sort-an-array

Heap (Priority Queue)

0023-merge-k-sorted-lists
0264-ugly-number-ii
0789-kth-largest-element-in-a-stream
0803-cheapest-flights-within-k-stops
0892-shortest-subarray-with-sum-at-least-k
0948-sort-an-array
1304-longest-happy-string
1325-path-with-maximum-probability
1917-maximum-average-pass-ratio
1953-finding-mk-average
1962-single-threaded-cpu
2054-the-number-of-the-smallest-unoccupied-chair
2164-two-best-non-overlapping-events
2300-construct-string-with-repeat-limit
2375-minimum-obstacle-removal-to-reach-corner
2488-divide-intervals-into-minimum-number-of-groups
2616-maximal-score-after-applying-k-operations
2695-find-score-of-an-array-after-marking-all-elements
2711-minimum-time-to-visit-a-cell-in-a-grid
2803-modify-graph-edge-weights
2868-continuous-subarrays
3181-find-building-where-alice-and-bob-can-meet
3555-final-array-state-after-k-multiplication-operations-i
3627-find-minimum-time-to-reach-last-room-i

Merge Sort

0023-merge-k-sorted-lists
0948-sort-an-array

Bucket Sort

0948-sort-an-array

Radix Sort

0948-sort-an-array

Counting Sort

0920-uncommon-words-from-two-sentences
0948-sort-an-array
1620-check-if-array-pairs-are-divisible-by-k
2163-kth-distinct-string-in-an-array
2300-construct-string-with-repeat-limit
2356-largest-combination-with-bitwise-and-greater-than-zero
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

Shortest Path

0803-cheapest-flights-within-k-stops
1325-path-with-maximum-probability
1456-find-the-city-with-the-smallest-number-of-neighbors-at-a-threshold-distance
2171-second-minimum-time-to-reach-destination
2375-minimum-obstacle-removal-to-reach-corner
2711-minimum-time-to-visit-a-cell-in-a-grid
2803-modify-graph-edge-weights
3235-minimum-cost-to-convert-string-i
3627-find-minimum-time-to-reach-last-room-i

Binary Indexed Tree

1511-count-number-of-teams
3181-find-building-where-alice-and-bob-can-meet

Sliding Window

0892-shortest-subarray-with-sum-at-least-k
1755-defuse-the-bomb
2255-minimum-swaps-to-group-all-1s-together-ii
2552-maximum-sum-of-distinct-subarrays-with-length-k
2599-take-k-of-each-character-from-left-and-right
2868-continuous-subarrays
2891-maximum-beauty-of-an-array-after-applying-operation
3267-find-longest-special-substring-that-occurs-thrice-i
3522-find-the-power-of-k-size-subarrays-i
3523-find-the-power-of-k-size-subarrays-ii
3622-maximum-frequency-of-an-element-after-performing-operations-i
3640-maximum-frequency-of-an-element-after-performing-operations-ii

Binary Search Tree

0789-kth-largest-element-in-a-stream

Data Stream

0789-kth-largest-element-in-a-stream
1953-finding-mk-average

Backtracking

0017-letter-combinations-of-a-phone-number
0040-combination-sum-ii
0079-word-search
0212-word-search-ii
0494-target-sum
2170-count-number-of-maximum-bitwise-or-subsets

Two Pointers

0719-find-k-th-smallest-pair-distance
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
2414-move-pieces-to-obtain-a-string
2488-divide-intervals-into-minimum-number-of-groups
2581-divide-players-into-teams-of-equal-skill
2699-count-the-number-of-fair-pairs
3195-separate-black-and-white-balls

Game Theory

1240-stone-game-ii

Bit Manipulation

0029-divide-two-integers
0137-single-number-ii
0338-counting-bits
0476-number-complement
1435-xor-queries-of-a-subarray
1473-find-the-longest-substring-containing-vowels-in-even-counts
2059-unique-length-3-palindromic-subsequences
2170-count-number-of-maximum-bitwise-or-subsets
2323-minimum-bit-flips-to-convert-number
2356-largest-combination-with-bitwise-and-greater-than-zero
2503-longest-subarray-with-maximum-bitwise-and
3291-find-if-array-can-be-sorted
3394-minimum-array-end

Trie

0208-implement-trie-prefix-tree
0212-word-search-ii
0336-palindrome-pairs
0386-lexicographical-numbers
2494-sum-of-prefix-scores-of-strings
2755-extra-characters-in-a-string
3329-find-the-length-of-the-longest-common-prefix

Number Theory

0989-largest-component-size-by-common-factor
2716-prime-subtraction-operation
2903-insert-greatest-common-divisors-in-linked-list

Brainteaser

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

Memoization

0241-different-ways-to-add-parentheses

Doubly-Linked List

0432-all-oone-data-structure

Monotonic Stack

0780-max-chunks-to-make-sorted
1002-maximum-width-ramp
1017-odd-even-jump
1679-shortest-subarray-to-be-removed-to-make-array-sorted
3181-find-building-where-alice-and-bob-can-meet

Enumeration

2170-count-number-of-maximum-bitwise-or-subsets

String Matching

0812-rotate-string
1524-string-matching-in-an-array
1566-check-if-a-word-occurs-as-a-prefix-of-any-word-in-a-sentence

Monotonic Queue

0892-shortest-subarray-with-sum-at-least-k
2868-continuous-subarrays

Eulerian Circuit

2201-valid-arrangement-of-pairs

Minimum Spanning Tree

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