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

LeetCode Topics

Depth-First Search

0110-balanced-binary-tree
0144-binary-tree-preorder-traversal
0145-binary-tree-postorder-traversal
0365-water-and-jug-problem
0386-lexicographical-numbers
0695-max-area-of-island
0776-n-ary-tree-postorder-traversal
0984-most-stones-removed-with-same-row-or-column
0999-regions-cut-by-slashes
1207-delete-nodes-and-return-forest
1350-remove-sub-folders-from-the-filesystem
1431-all-ancestors-of-a-node-in-a-directed-acyclic-graph
1484-linked-list-in-binary-tree
1653-number-of-good-leaf-nodes-pairs
1691-minimum-number-of-days-to-disconnect-island
2121-find-if-path-exists-in-graph
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

Breadth-First Search

0102-binary-tree-level-order-traversal
0365-water-and-jug-problem
0695-max-area-of-island
0998-check-completeness-of-a-binary-tree
0999-regions-cut-by-slashes
1171-shortest-path-in-binary-matrix
1431-all-ancestors-of-a-node-in-a-directed-acyclic-graph
1484-linked-list-in-binary-tree
1691-minimum-number-of-days-to-disconnect-island
1757-minimum-jumps-to-reach-home
2121-find-if-path-exists-in-graph
2171-second-minimum-time-to-reach-destination
2493-reverse-odd-levels-of-binary-tree
2646-kth-largest-sum-in-a-binary-tree
2677-cousins-in-binary-tree-ii

Graph

0984-most-stones-removed-with-same-row-or-column
1325-path-with-maximum-probability
1431-all-ancestors-of-a-node-in-a-directed-acyclic-graph
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
2121-find-if-path-exists-in-graph
2171-second-minimum-time-to-reach-destination
2472-build-a-matrix-with-conditions
3235-minimum-cost-to-convert-string-i

Topological Sort

1431-all-ancestors-of-a-node-in-a-directed-acyclic-graph
2472-build-a-matrix-with-conditions

Union Find

0695-max-area-of-island
0984-most-stones-removed-with-same-row-or-column
0999-regions-cut-by-slashes
1701-remove-max-number-of-edges-to-keep-graph-fully-traversable
1706-min-cost-to-connect-all-points
2121-find-if-path-exists-in-graph

Array

0001-two-sum
0026-remove-duplicates-from-sorted-array
0056-merge-intervals
0057-insert-interval
0075-sort-colors
0085-maximal-rectangle
0135-candy
0189-rotate-array
0198-house-robber
0215-kth-largest-element-in-an-array
0283-move-zeroes
0350-intersection-of-two-arrays-ii
0493-reverse-pairs
0496-next-greater-element-i
0503-next-greater-element-ii
0575-distribute-candies
0598-range-addition-ii
0611-valid-triangle-number
0624-maximum-distance-in-arrays
0695-max-area-of-island
0719-find-k-th-smallest-pair-distance
0729-my-calendar-i
0735-asteroid-collision
0859-design-circular-deque
0870-magic-squares-in-grid
0883-car-fleet
0890-lemonade-change
0911-profitable-schemes
0921-spiral-matrix-iii
0943-sum-of-subarray-minimums
0948-sort-an-array
0966-binary-subarrays-with-sum
0974-reorder-data-in-log-files
0999-regions-cut-by-slashes
1002-maximum-width-ramp
1014-k-closest-points-to-origin
1044-find-common-characters
1046-max-consecutive-ones-iii
1171-shortest-path-in-binary-matrix
1196-filling-bookcase-shelves
1207-delete-nodes-and-return-forest
1240-stone-game-ii
1256-rank-transform-of-an-array
1293-three-consecutive-odds
1325-path-with-maximum-probability
1330-longest-arithmetic-subsequence-of-given-difference
1333-sort-the-jumbled-numbers
1350-remove-sub-folders-from-the-filesystem
1352-maximum-profit-in-job-scheduling
1402-count-square-submatrices-with-all-ones
1435-xor-queries-of-a-subarray
1496-lucky-numbers-in-a-matrix
1511-count-number-of-teams
1556-make-two-arrays-equal-by-reversing-subarrays
1615-range-sum-of-sorted-subarray-sums
1616-minimum-difference-between-largest-and-smallest-value-in-three-moves
1620-check-if-array-pairs-are-divisible-by-k
1691-minimum-number-of-days-to-disconnect-island
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
1741-sort-array-by-increasing-frequency
1744-number-of-ways-to-form-a-target-string-given-a-dictionary
1755-defuse-the-bomb
1757-minimum-jumps-to-reach-home
1786-count-the-number-of-consistent-strings
1803-average-waiting-time
1878-check-if-array-is-sorted-and-rotated
1923-sentence-similarity-iii
1951-find-the-winner-of-the-circular-game
2006-find-the-student-that-will-replace-the-chalk
2054-the-number-of-the-smallest-unoccupied-chair
2163-kth-distinct-string-in-an-array
2170-count-number-of-maximum-bitwise-or-subsets
2227-sum-of-subarray-ranges
2255-minimum-swaps-to-group-all-1s-together-ii
2306-create-binary-tree-from-descriptions
2356-largest-combination-with-bitwise-and-greater-than-zero
2411-spiral-matrix-iv
2472-build-a-matrix-with-conditions
2479-meeting-rooms-iii
2488-divide-intervals-into-minimum-number-of-groups
2502-sort-the-people
2503-longest-subarray-with-maximum-bitwise-and
2581-divide-players-into-teams-of-equal-skill
2586-longest-square-streak-in-an-array
2616-maximal-score-after-applying-k-operations
2727-number-of-senior-citizens
2755-extra-characters-in-a-string
2846-robot-collisions
2891-maximum-beauty-of-an-array-after-applying-operation
3235-minimum-cost-to-convert-string-i
3329-find-the-length-of-the-longest-common-prefix
3501-delete-nodes-from-linked-list-present-in-array
3579-maximum-possible-number-by-binary-concatenation

Hash Table

0001-two-sum
0003-longest-substring-without-repeating-characters
0076-minimum-window-substring
0141-linked-list-cycle
0142-linked-list-cycle-ii
0166-fraction-to-recurring-decimal
0202-happy-number
0264-ugly-number-ii
0350-intersection-of-two-arrays-ii
0424-longest-repeating-character-replacement
0438-find-all-anagrams-in-a-string
0496-next-greater-element-i
0567-permutation-in-string
0575-distribute-candies
0726-number-of-atoms
0870-magic-squares-in-grid
0966-binary-subarrays-with-sum
0984-most-stones-removed-with-same-row-or-column
0999-regions-cut-by-slashes
1044-find-common-characters
1207-delete-nodes-and-return-forest
1256-rank-transform-of-an-array
1330-longest-arithmetic-subsequence-of-given-difference
1473-find-the-longest-substring-containing-vowels-in-even-counts
1556-make-two-arrays-equal-by-reversing-subarrays
1619-path-crossing
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
1741-sort-array-by-increasing-frequency
1786-count-the-number-of-consistent-strings
2054-the-number-of-the-smallest-unoccupied-chair
2163-kth-distinct-string-in-an-array
2306-create-binary-tree-from-descriptions
2356-largest-combination-with-bitwise-and-greater-than-zero
2479-meeting-rooms-iii
2502-sort-the-people
2581-divide-players-into-teams-of-equal-skill
2586-longest-square-streak-in-an-array
2677-cousins-in-binary-tree-ii
2755-extra-characters-in-a-string
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

Two Pointers

0005-longest-palindromic-substring
0019-remove-nth-node-from-end-of-list
0026-remove-duplicates-from-sorted-array
0075-sort-colors
0141-linked-list-cycle
0142-linked-list-cycle-ii
0143-reorder-list
0151-reverse-words-in-a-string
0189-rotate-array
0202-happy-number
0234-palindrome-linked-list
0283-move-zeroes
0350-intersection-of-two-arrays-ii
0567-permutation-in-string
0611-valid-triangle-number
0719-find-k-th-smallest-pair-distance
0908-middle-of-the-linked-list
1615-range-sum-of-sorted-subarray-sums
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
3195-separate-black-and-white-balls

Binary Search

0350-intersection-of-two-arrays-ii
0493-reverse-pairs
0611-valid-triangle-number
0719-find-k-th-smallest-pair-distance
0729-my-calendar-i
1046-max-consecutive-ones-iii
1352-maximum-profit-in-job-scheduling
1615-range-sum-of-sorted-subarray-sums
2006-find-the-student-that-will-replace-the-chalk
2586-longest-square-streak-in-an-array
2891-maximum-beauty-of-an-array-after-applying-operation

Sorting

0056-merge-intervals
0075-sort-colors
0215-kth-largest-element-in-an-array
0350-intersection-of-two-arrays-ii
0611-valid-triangle-number
0719-find-k-th-smallest-pair-distance
0726-number-of-atoms
0883-car-fleet
0935-orderly-queue
0948-sort-an-array
0974-reorder-data-in-log-files
1014-k-closest-points-to-origin
1256-rank-transform-of-an-array
1333-sort-the-jumbled-numbers
1352-maximum-profit-in-job-scheduling
1556-make-two-arrays-equal-by-reversing-subarrays
1615-range-sum-of-sorted-subarray-sums
1616-minimum-difference-between-largest-and-smallest-value-in-three-moves
1741-sort-array-by-increasing-frequency
2479-meeting-rooms-iii
2488-divide-intervals-into-minimum-number-of-groups
2502-sort-the-people
2581-divide-players-into-teams-of-equal-skill
2586-longest-square-streak-in-an-array
2646-kth-largest-sum-in-a-binary-tree
2846-robot-collisions
2891-maximum-beauty-of-an-array-after-applying-operation
3276-minimum-number-of-pushes-to-type-word-ii

Greedy

0135-candy
0611-valid-triangle-number
0624-maximum-distance-in-arrays
0670-maximum-swap
0890-lemonade-change
0957-minimum-add-to-make-parentheses-valid
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
2032-largest-odd-number-in-string
2095-minimum-number-of-swaps-to-make-the-string-balanced
2488-divide-intervals-into-minimum-number-of-groups
2616-maximal-score-after-applying-k-operations
3195-separate-black-and-white-balls
3276-minimum-number-of-pushes-to-type-word-ii

Linked List

0019-remove-nth-node-from-end-of-list
0021-merge-two-sorted-lists
0092-reverse-linked-list-ii
0141-linked-list-cycle
0142-linked-list-cycle-ii
0143-reorder-list
0206-reverse-linked-list
0234-palindrome-linked-list
0725-split-linked-list-in-parts
0859-design-circular-deque
0908-middle-of-the-linked-list
1484-linked-list-in-binary-tree
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

0043-multiply-strings
0735-asteroid-collision
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
2076-sum-of-digits-of-string-after-convert
2299-merge-nodes-in-between-zeros
2411-spiral-matrix-iv
2479-meeting-rooms-iii
2645-pass-the-pillow
2800-minimum-string-length-after-removing-substrings
2846-robot-collisions

Math

0043-multiply-strings
0166-fraction-to-recurring-decimal
0189-rotate-array
0202-happy-number
0241-different-ways-to-add-parentheses
0264-ugly-number-ii
0365-water-and-jug-problem
0598-range-addition-ii
0650-2-keys-keyboard
0670-maximum-swap
0870-magic-squares-in-grid
0935-orderly-queue
1014-k-closest-points-to-origin
1240-stone-game-ii
1642-water-bottles
1951-find-the-winner-of-the-circular-game
2032-largest-odd-number-in-string
2645-pass-the-pillow
2903-insert-greatest-common-divisors-in-linked-list
3553-check-if-two-chessboard-squares-have-the-same-color

Recursion

0021-merge-two-sorted-lists
0143-reorder-list
0206-reverse-linked-list
0234-palindrome-linked-list
0241-different-ways-to-add-parentheses
1951-find-the-winner-of-the-circular-game

Queue

0859-design-circular-deque
1951-find-the-winner-of-the-circular-game

Stack

0085-maximal-rectangle
0143-reorder-list
0144-binary-tree-preorder-traversal
0145-binary-tree-postorder-traversal
0234-palindrome-linked-list
0496-next-greater-element-i
0503-next-greater-element-ii
0726-number-of-atoms
0735-asteroid-collision
0776-n-ary-tree-postorder-traversal
0883-car-fleet
0943-sum-of-subarray-minimums
0957-minimum-add-to-make-parentheses-valid
1002-maximum-width-ramp
1078-remove-outermost-parentheses
1298-reverse-substrings-between-each-pair-of-parentheses
1666-make-the-string-great
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
2227-sum-of-subarray-ranges
2800-minimum-string-length-after-removing-substrings
2846-robot-collisions

String

0003-longest-substring-without-repeating-characters
0005-longest-palindromic-substring
0014-longest-common-prefix
0043-multiply-strings
0076-minimum-window-substring
0091-decode-ways
0151-reverse-words-in-a-string
0166-fraction-to-recurring-decimal
0214-shortest-palindrome
0241-different-ways-to-add-parentheses
0424-longest-repeating-character-replacement
0438-find-all-anagrams-in-a-string
0567-permutation-in-string
0726-number-of-atoms
0812-rotate-string
0935-orderly-queue
0957-minimum-add-to-make-parentheses-valid
0974-reorder-data-in-log-files
1044-find-common-characters
1078-remove-outermost-parentheses
1298-reverse-substrings-between-each-pair-of-parentheses
1302-delete-characters-to-make-fancy-string
1350-remove-sub-folders-from-the-filesystem
1437-minimum-insertion-steps-to-make-a-string-palindrome
1473-find-the-longest-substring-containing-vowels-in-even-counts
1517-restore-the-array
1619-path-crossing
1666-make-the-string-great
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
1756-minimum-deletions-to-make-string-balanced
1786-count-the-number-of-consistent-strings
1818-maximum-score-from-removing-substrings
1884-minimum-changes-to-make-alternating-binary-string
1923-sentence-similarity-iii
2032-largest-odd-number-in-string
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
2414-move-pieces-to-obtain-a-string
2502-sort-the-people
2580-circular-sentence
2727-number-of-senior-citizens
2755-extra-characters-in-a-string
2800-minimum-string-length-after-removing-substrings
3195-separate-black-and-white-balls
3235-minimum-cost-to-convert-string-i
3276-minimum-number-of-pushes-to-type-word-ii
3329-find-the-length-of-the-longest-common-prefix
3553-check-if-two-chessboard-squares-have-the-same-color

Tree

0102-binary-tree-level-order-traversal
0110-balanced-binary-tree
0144-binary-tree-preorder-traversal
0145-binary-tree-postorder-traversal
0776-n-ary-tree-postorder-traversal
0998-check-completeness-of-a-binary-tree
1207-delete-nodes-and-return-forest
1484-linked-list-in-binary-tree
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

Binary Tree

0102-binary-tree-level-order-traversal
0110-balanced-binary-tree
0144-binary-tree-preorder-traversal
0145-binary-tree-postorder-traversal
0998-check-completeness-of-a-binary-tree
1207-delete-nodes-and-return-forest
1484-linked-list-in-binary-tree
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

0085-maximal-rectangle
0695-max-area-of-island
0870-magic-squares-in-grid
0921-spiral-matrix-iii
0999-regions-cut-by-slashes
1171-shortest-path-in-binary-matrix
1402-count-square-submatrices-with-all-ones
1496-lucky-numbers-in-a-matrix
1691-minimum-number-of-days-to-disconnect-island
1711-find-valid-matrix-given-row-and-column-sums
2411-spiral-matrix-iv
2472-build-a-matrix-with-conditions

Dynamic Programming

0005-longest-palindromic-substring
0085-maximal-rectangle
0091-decode-ways
0198-house-robber
0241-different-ways-to-add-parentheses
0264-ugly-number-ii
0650-2-keys-keyboard
0911-profitable-schemes
0943-sum-of-subarray-minimums
1196-filling-bookcase-shelves
1240-stone-game-ii
1330-longest-arithmetic-subsequence-of-given-difference
1352-maximum-profit-in-job-scheduling
1402-count-square-submatrices-with-all-ones
1437-minimum-insertion-steps-to-make-a-string-palindrome
1456-find-the-city-with-the-smallest-number-of-neighbors-at-a-threshold-distance
1511-count-number-of-teams
1517-restore-the-array
1744-number-of-ways-to-form-a-target-string-given-a-dictionary
1756-minimum-deletions-to-make-string-balanced
1757-minimum-jumps-to-reach-home
2586-longest-square-streak-in-an-array
2755-extra-characters-in-a-string

Sliding Window

0003-longest-substring-without-repeating-characters
0076-minimum-window-substring
0424-longest-repeating-character-replacement
0438-find-all-anagrams-in-a-string
0567-permutation-in-string
0966-binary-subarrays-with-sum
1046-max-consecutive-ones-iii
1755-defuse-the-bomb
2255-minimum-swaps-to-group-all-1s-together-ii
2891-maximum-beauty-of-an-array-after-applying-operation

Divide and Conquer

0215-kth-largest-element-in-an-array
0493-reverse-pairs
0948-sort-an-array
1014-k-closest-points-to-origin

Geometry

1014-k-closest-points-to-origin

Heap (Priority Queue)

0215-kth-largest-element-in-an-array
0264-ugly-number-ii
0948-sort-an-array
1014-k-closest-points-to-origin
1325-path-with-maximum-probability
2054-the-number-of-the-smallest-unoccupied-chair
2479-meeting-rooms-iii
2488-divide-intervals-into-minimum-number-of-groups
2616-maximal-score-after-applying-k-operations

Quickselect

0215-kth-largest-element-in-an-array
1014-k-closest-points-to-origin

Minimum Spanning Tree

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

Merge Sort

0493-reverse-pairs
0948-sort-an-array

Bucket Sort

0948-sort-an-array

Radix Sort

0948-sort-an-array

Counting Sort

0948-sort-an-array
1620-check-if-array-pairs-are-divisible-by-k
1786-count-the-number-of-consistent-strings
2163-kth-distinct-string-in-an-array
2356-largest-combination-with-bitwise-and-greater-than-zero
3276-minimum-number-of-pushes-to-type-word-ii

Shortest Path

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
3235-minimum-cost-to-convert-string-i

Binary Indexed Tree

0493-reverse-pairs
1511-count-number-of-teams

Prefix Sum

0966-binary-subarrays-with-sum
1046-max-consecutive-ones-iii
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
2006-find-the-student-that-will-replace-the-chalk
2488-divide-intervals-into-minimum-number-of-groups

Strongly Connected Component

1691-minimum-number-of-days-to-disconnect-island

Game Theory

1240-stone-game-ii

Database

0197-rising-temperature
0584-find-customer-referee
0595-big-countries
0620-not-boring-movies
1153-product-sales-analysis-i
1258-article-views-i
1390-average-selling-price
1509-replace-employee-id-with-the-unique-identifier
1724-customer-who-visited-but-did-not-make-any-transactions
1827-invalid-tweets
1908-recyclable-and-low-fat-products

Number Theory

2903-insert-greatest-common-divisors-in-linked-list

Segment Tree

0493-reverse-pairs
0729-my-calendar-i

Ordered Set

0493-reverse-pairs
0729-my-calendar-i

Bit Manipulation

1435-xor-queries-of-a-subarray
1473-find-the-longest-substring-containing-vowels-in-even-counts
1786-count-the-number-of-consistent-strings
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
3579-maximum-possible-number-by-binary-concatenation

Monotonic Stack

0085-maximal-rectangle
0496-next-greater-element-i
0503-next-greater-element-ii
0883-car-fleet
0943-sum-of-subarray-minimums
1002-maximum-width-ramp
2227-sum-of-subarray-ranges

Brainteaser

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

Memoization

0241-different-ways-to-add-parentheses

Rolling Hash

0214-shortest-palindrome

String Matching

0214-shortest-palindrome
0812-rotate-string

Hash Function

0214-shortest-palindrome

Trie

0014-longest-common-prefix
0386-lexicographical-numbers
0440-k-th-smallest-in-lexicographical-order
1350-remove-sub-folders-from-the-filesystem
2755-extra-characters-in-a-string
3329-find-the-length-of-the-longest-common-prefix

Design

0729-my-calendar-i
0859-design-circular-deque

Enumeration

2170-count-number-of-maximum-bitwise-or-subsets
3579-maximum-possible-number-by-binary-concatenation

Backtracking

1715-split-a-string-into-the-max-number-of-unique-substrings
2170-count-number-of-maximum-bitwise-or-subsets