Leetcode-questions

LeetCode Topics

Array


0001-two-sum
0011-container-with-most-water
0018-4sum
0042-trapping-rain-water
0048-rotate-image
0049-group-anagrams
0053-maximum-subarray
0106-construct-binary-tree-from-inorder-and-postorder-traversal
0128-longest-consecutive-sequence
0130-surrounded-regions
0153-find-minimum-in-rotated-sorted-array
0200-number-of-islands
0219-contains-duplicate-ii
0229-majority-element-ii
0523-continuous-subarray-sum
0525-contiguous-array
0542-01-matrix
0560-subarray-sum-equals-k
0628-maximum-product-of-three-numbers
0695-max-area-of-island
0705-design-hashset
0713-subarray-product-less-than-k
0733-flood-fill
0832-flipping-an-image
0845-longest-mountain-in-array
0848-shifting-letters
0867-transpose-matrix
0974-subarray-sums-divisible-by-k
0992-subarrays-with-k-different-integers
0994-rotting-oranges
0997-find-the-town-judge
1004-max-consecutive-ones-iii
1020-number-of-enclaves
1260-shift-2d-grid
1299-replace-elements-with-greatest-element-on-right-side
1331-rank-transform-of-an-array
1346-check-if-n-and-its-double-exist
1394-find-lucky-integer-in-an-array
1464-maximum-product-of-two-elements-in-an-array
1475-final-prices-with-a-special-discount-in-a-shop
1631-path-with-minimum-effort
1732-find-the-highest-altitude
1748-sum-of-unique-elements
1833-maximum-ice-cream-bars
1855-maximum-distance-between-a-pair-of-values
1967-number-of-strings-that-appear-as-substrings-in-word
1979-find-greatest-common-divisor-of-array
2078-two-furthest-houses-with-different-colors
2161-partition-array-according-to-given-pivot
2302-count-subarrays-with-score-less-than-k
2410-maximum-matching-of-players-with-trainers
2540-minimum-common-value
2553-separate-the-digits-in-an-array
2574-left-and-right-sum-differences
2679-sum-in-a-matrix

Two Pointers


0011-container-with-most-water
0018-4sum
0042-trapping-rain-water
0061-rotate-list
0082-remove-duplicates-from-sorted-list-ii
0653-two-sum-iv-input-is-a-bst
0832-flipping-an-image
0845-longest-mountain-in-array
1346-check-if-n-and-its-double-exist
1855-maximum-distance-between-a-pair-of-values
2000-reverse-prefix-of-word
2095-delete-the-middle-node-of-a-linked-list
2161-partition-array-according-to-given-pivot
2410-maximum-matching-of-players-with-trainers
2540-minimum-common-value

Binary Search


0153-find-minimum-in-rotated-sorted-array
0367-valid-perfect-square
0441-arranging-coins
0713-subarray-product-less-than-k
1004-max-consecutive-ones-iii
1346-check-if-n-and-its-double-exist
1631-path-with-minimum-effort
1855-maximum-distance-between-a-pair-of-values
2302-count-subarrays-with-score-less-than-k
2540-minimum-common-value

Math


0007-reverse-integer
0048-rotate-image
0367-valid-perfect-square
0441-arranging-coins
0445-add-two-numbers-ii
0523-continuous-subarray-sum
0628-maximum-product-of-three-numbers
1486-xor-operation-in-an-array
1979-find-greatest-common-divisor-of-array
3536-maximum-product-of-two-digits
3658-gcd-of-odd-and-even-sums
3754-concatenate-non-zero-digits-and-multiply-by-sum-i
3783-mirror-distance-of-an-integer

Greedy


0011-container-with-most-water
0409-longest-palindrome
0678-valid-parenthesis-string
1081-smallest-subsequence-of-distinct-characters
1833-maximum-ice-cream-bars
2078-two-furthest-houses-with-different-colors
2410-maximum-matching-of-players-with-trainers

Stack


0042-trapping-rain-water
0445-add-two-numbers-ii
0678-valid-parenthesis-string
0897-increasing-order-search-tree
1081-smallest-subsequence-of-distinct-characters
1475-final-prices-with-a-special-discount-in-a-shop
2000-reverse-prefix-of-word
2390-removing-stars-from-a-string

Tree


0102-binary-tree-level-order-traversal
0106-construct-binary-tree-from-inorder-and-postorder-traversal
0111-minimum-depth-of-binary-tree
0112-path-sum
0230-kth-smallest-element-in-a-bst
0235-lowest-common-ancestor-of-a-binary-search-tree
0257-binary-tree-paths
0404-sum-of-left-leaves
0450-delete-node-in-a-bst
0513-find-bottom-left-tree-value
0653-two-sum-iv-input-is-a-bst
0701-insert-into-a-binary-search-tree
0897-increasing-order-search-tree
1373-maximum-sum-bst-in-binary-tree

Depth-First Search


0111-minimum-depth-of-binary-tree
0112-path-sum
0130-surrounded-regions
0200-number-of-islands
0207-course-schedule
0230-kth-smallest-element-in-a-bst
0235-lowest-common-ancestor-of-a-binary-search-tree
0257-binary-tree-paths
0404-sum-of-left-leaves
0513-find-bottom-left-tree-value
0547-number-of-provinces
0653-two-sum-iv-input-is-a-bst
0695-max-area-of-island
0733-flood-fill
0743-network-delay-time
0785-is-graph-bipartite
0787-cheapest-flights-within-k-stops
0802-find-eventual-safe-states
0897-increasing-order-search-tree
1020-number-of-enclaves
1319-number-of-operations-to-make-network-connected
1373-maximum-sum-bst-in-binary-tree
1631-path-with-minimum-effort

Binary Search Tree


0230-kth-smallest-element-in-a-bst
0235-lowest-common-ancestor-of-a-binary-search-tree
0450-delete-node-in-a-bst
0653-two-sum-iv-input-is-a-bst
0701-insert-into-a-binary-search-tree
0897-increasing-order-search-tree
1373-maximum-sum-bst-in-binary-tree

Binary Tree


0102-binary-tree-level-order-traversal
0106-construct-binary-tree-from-inorder-and-postorder-traversal
0111-minimum-depth-of-binary-tree
0112-path-sum
0230-kth-smallest-element-in-a-bst
0235-lowest-common-ancestor-of-a-binary-search-tree
0257-binary-tree-paths
0404-sum-of-left-leaves
0450-delete-node-in-a-bst
0513-find-bottom-left-tree-value
0653-two-sum-iv-input-is-a-bst
0701-insert-into-a-binary-search-tree
0897-increasing-order-search-tree
1373-maximum-sum-bst-in-binary-tree

Linked List


0061-rotate-list
0082-remove-duplicates-from-sorted-list-ii
0083-remove-duplicates-from-sorted-list
0445-add-two-numbers-ii
0705-design-hashset
2095-delete-the-middle-node-of-a-linked-list

Hash Table


0001-two-sum
0003-longest-substring-without-repeating-characters
0049-group-anagrams
0106-construct-binary-tree-from-inorder-and-postorder-traversal
0127-word-ladder
0128-longest-consecutive-sequence
0187-repeated-dna-sequences
0219-contains-duplicate-ii
0229-majority-element-ii
0409-longest-palindrome
0438-find-all-anagrams-in-a-string
0523-continuous-subarray-sum
0525-contiguous-array
0560-subarray-sum-equals-k
0653-two-sum-iv-input-is-a-bst
0705-design-hashset
0974-subarray-sums-divisible-by-k
0992-subarrays-with-k-different-integers
0997-find-the-town-judge
1189-maximum-number-of-balloons
1331-rank-transform-of-an-array
1346-check-if-n-and-its-double-exist
1358-number-of-substrings-containing-all-three-characters
1394-find-lucky-integer-in-an-array
1748-sum-of-unique-elements
2540-minimum-common-value

Design


0705-design-hashset

Hash Function


0187-repeated-dna-sequences
0705-design-hashset

String


0003-longest-substring-without-repeating-characters
0006-zigzag-conversion
0049-group-anagrams
0127-word-ladder
0187-repeated-dna-sequences
0257-binary-tree-paths
0409-longest-palindrome
0438-find-all-anagrams-in-a-string
0678-valid-parenthesis-string
0686-repeated-string-match
0796-rotate-string
0848-shifting-letters
1081-smallest-subsequence-of-distinct-characters
1189-maximum-number-of-balloons
1358-number-of-substrings-containing-all-three-characters
1967-number-of-strings-that-appear-as-substrings-in-word
2000-reverse-prefix-of-word
2390-removing-stars-from-a-string
3517-smallest-palindromic-rearrangement-i
3612-process-string-with-special-operations-i

Backtracking


0257-binary-tree-paths

Breadth-First Search


0102-binary-tree-level-order-traversal
0111-minimum-depth-of-binary-tree
0112-path-sum
0127-word-ladder
0130-surrounded-regions
0200-number-of-islands
0207-course-schedule
0404-sum-of-left-leaves
0513-find-bottom-left-tree-value
0542-01-matrix
0547-number-of-provinces
0653-two-sum-iv-input-is-a-bst
0695-max-area-of-island
0733-flood-fill
0743-network-delay-time
0785-is-graph-bipartite
0787-cheapest-flights-within-k-stops
0802-find-eventual-safe-states
0994-rotting-oranges
1020-number-of-enclaves
1319-number-of-operations-to-make-network-connected
1631-path-with-minimum-effort

Counting


0229-majority-element-ii
0992-subarrays-with-k-different-integers
1189-maximum-number-of-balloons
1394-find-lucky-integer-in-an-array
1748-sum-of-unique-elements

Divide and Conquer


0053-maximum-subarray
0106-construct-binary-tree-from-inorder-and-postorder-traversal
0190-reverse-bits

Bit Manipulation


0187-repeated-dna-sequences
0190-reverse-bits
0476-number-complement
0832-flipping-an-image
1486-xor-operation-in-an-array

Simulation


0832-flipping-an-image
0867-transpose-matrix
1260-shift-2d-grid
2161-partition-array-according-to-given-pivot
2390-removing-stars-from-a-string
2553-separate-the-digits-in-an-array
2679-sum-in-a-matrix
3612-process-string-with-special-operations-i

String Matching


0686-repeated-string-match
0796-rotate-string

Matrix


0048-rotate-image
0130-surrounded-regions
0200-number-of-islands
0542-01-matrix
0695-max-area-of-island
0733-flood-fill
0832-flipping-an-image
0867-transpose-matrix
0994-rotting-oranges
1020-number-of-enclaves
1260-shift-2d-grid
1631-path-with-minimum-effort
2679-sum-in-a-matrix

Sliding Window


0003-longest-substring-without-repeating-characters
0187-repeated-dna-sequences
0219-contains-duplicate-ii
0438-find-all-anagrams-in-a-string
0713-subarray-product-less-than-k
0992-subarrays-with-k-different-integers
1004-max-consecutive-ones-iii
1358-number-of-substrings-containing-all-three-characters
2302-count-subarrays-with-score-less-than-k

Prefix Sum


0523-continuous-subarray-sum
0525-contiguous-array
0560-subarray-sum-equals-k
0713-subarray-product-less-than-k
0848-shifting-letters
0974-subarray-sums-divisible-by-k
1004-max-consecutive-ones-iii
1732-find-the-highest-altitude
2302-count-subarrays-with-score-less-than-k
2574-left-and-right-sum-differences

Sorting


0018-4sum
0049-group-anagrams
0229-majority-element-ii
0628-maximum-product-of-three-numbers
1331-rank-transform-of-an-array
1346-check-if-n-and-its-double-exist
1464-maximum-product-of-two-elements-in-an-array
1833-maximum-ice-cream-bars
2410-maximum-matching-of-players-with-trainers
2679-sum-in-a-matrix
3517-smallest-palindromic-rearrangement-i
3536-maximum-product-of-two-digits

Counting Sort


1833-maximum-ice-cream-bars
3517-smallest-palindromic-rearrangement-i

Monotonic Stack


0042-trapping-rain-water
1081-smallest-subsequence-of-distinct-characters
1475-final-prices-with-a-special-discount-in-a-shop

Dynamic Programming


0042-trapping-rain-water
0053-maximum-subarray
0542-01-matrix
0678-valid-parenthesis-string
0787-cheapest-flights-within-k-stops
0845-longest-mountain-in-array
1373-maximum-sum-bst-in-binary-tree
1976-number-of-ways-to-arrive-at-destination

Union-Find


0128-longest-consecutive-sequence
0130-surrounded-regions
0200-number-of-islands
0547-number-of-provinces
0695-max-area-of-island
0785-is-graph-bipartite
1020-number-of-enclaves
1319-number-of-operations-to-make-network-connected
1631-path-with-minimum-effort

Graph Theory


0207-course-schedule
0547-number-of-provinces
0743-network-delay-time
0785-is-graph-bipartite
0787-cheapest-flights-within-k-stops
0802-find-eventual-safe-states
0997-find-the-town-judge
1319-number-of-operations-to-make-network-connected
1976-number-of-ways-to-arrive-at-destination

Enumeration


0845-longest-mountain-in-array

Topological Sort


0207-course-schedule
0802-find-eventual-safe-states
1976-number-of-ways-to-arrive-at-destination

Heap (Priority Queue)


0743-network-delay-time
0787-cheapest-flights-within-k-stops
1464-maximum-product-of-two-elements-in-an-array
1631-path-with-minimum-effort
2679-sum-in-a-matrix

Number Theory


1979-find-greatest-common-divisor-of-array
3658-gcd-of-odd-and-even-sums

Shortest Path


0743-network-delay-time
0787-cheapest-flights-within-k-stops
1976-number-of-ways-to-arrive-at-destination

Rolling Hash


0187-repeated-dna-sequences

Name	Name	Last commit message	Last commit date
Latest commit History 462 Commits 462 Commits
0001-two-sum	0001-two-sum
0003-longest-substring-without-repeating-characters	0003-longest-substring-without-repeating-characters
0006-zigzag-conversion	0006-zigzag-conversion
0007-reverse-integer	0007-reverse-integer
0011-container-with-most-water	0011-container-with-most-water
0018-4sum	0018-4sum
0042-trapping-rain-water	0042-trapping-rain-water
0048-rotate-image	0048-rotate-image
0049-group-anagrams	0049-group-anagrams
0053-maximum-subarray	0053-maximum-subarray
0061-rotate-list	0061-rotate-list
0082-remove-duplicates-from-sorted-list-ii	0082-remove-duplicates-from-sorted-list-ii
0083-remove-duplicates-from-sorted-list	0083-remove-duplicates-from-sorted-list
0102-binary-tree-level-order-traversal	0102-binary-tree-level-order-traversal
0106-construct-binary-tree-from-inorder-and-postorder-traversal	0106-construct-binary-tree-from-inorder-and-postorder-traversal
0111-minimum-depth-of-binary-tree	0111-minimum-depth-of-binary-tree
0112-path-sum	0112-path-sum
0127-word-ladder	0127-word-ladder
0128-longest-consecutive-sequence	0128-longest-consecutive-sequence
0130-surrounded-regions	0130-surrounded-regions
0153-find-minimum-in-rotated-sorted-array	0153-find-minimum-in-rotated-sorted-array
0187-repeated-dna-sequences	0187-repeated-dna-sequences
0190-reverse-bits	0190-reverse-bits
0200-number-of-islands	0200-number-of-islands
0207-course-schedule	0207-course-schedule
0219-contains-duplicate-ii	0219-contains-duplicate-ii
0229-majority-element-ii	0229-majority-element-ii
0230-kth-smallest-element-in-a-bst	0230-kth-smallest-element-in-a-bst
0235-lowest-common-ancestor-of-a-binary-search-tree	0235-lowest-common-ancestor-of-a-binary-search-tree
0257-binary-tree-paths	0257-binary-tree-paths
0367-valid-perfect-square	0367-valid-perfect-square
0404-sum-of-left-leaves	0404-sum-of-left-leaves
0409-longest-palindrome	0409-longest-palindrome
0438-find-all-anagrams-in-a-string	0438-find-all-anagrams-in-a-string
0441-arranging-coins	0441-arranging-coins
0445-add-two-numbers-ii	0445-add-two-numbers-ii
0450-delete-node-in-a-bst	0450-delete-node-in-a-bst
0476-number-complement	0476-number-complement
0513-find-bottom-left-tree-value	0513-find-bottom-left-tree-value
0523-continuous-subarray-sum	0523-continuous-subarray-sum
0525-contiguous-array	0525-contiguous-array
0542-01-matrix	0542-01-matrix
0547-number-of-provinces	0547-number-of-provinces
0560-subarray-sum-equals-k	0560-subarray-sum-equals-k
0628-maximum-product-of-three-numbers	0628-maximum-product-of-three-numbers
0653-two-sum-iv-input-is-a-bst	0653-two-sum-iv-input-is-a-bst
0678-valid-parenthesis-string	0678-valid-parenthesis-string
0686-repeated-string-match	0686-repeated-string-match
0695-max-area-of-island	0695-max-area-of-island
0701-insert-into-a-binary-search-tree	0701-insert-into-a-binary-search-tree
0705-design-hashset	0705-design-hashset
0713-subarray-product-less-than-k	0713-subarray-product-less-than-k
0733-flood-fill	0733-flood-fill
0743-network-delay-time	0743-network-delay-time
0785-is-graph-bipartite	0785-is-graph-bipartite
0787-cheapest-flights-within-k-stops	0787-cheapest-flights-within-k-stops
0796-rotate-string	0796-rotate-string
0802-find-eventual-safe-states	0802-find-eventual-safe-states
0832-flipping-an-image	0832-flipping-an-image
0845-longest-mountain-in-array	0845-longest-mountain-in-array
0848-shifting-letters	0848-shifting-letters
0867-transpose-matrix	0867-transpose-matrix
0897-increasing-order-search-tree	0897-increasing-order-search-tree
0974-subarray-sums-divisible-by-k	0974-subarray-sums-divisible-by-k
0992-subarrays-with-k-different-integers	0992-subarrays-with-k-different-integers
0994-rotting-oranges	0994-rotting-oranges
0997-find-the-town-judge	0997-find-the-town-judge
1004-max-consecutive-ones-iii	1004-max-consecutive-ones-iii
1020-number-of-enclaves	1020-number-of-enclaves
1081-smallest-subsequence-of-distinct-characters	1081-smallest-subsequence-of-distinct-characters
1189-maximum-number-of-balloons	1189-maximum-number-of-balloons
1260-shift-2d-grid	1260-shift-2d-grid
1299-replace-elements-with-greatest-element-on-right-side	1299-replace-elements-with-greatest-element-on-right-side
1319-number-of-operations-to-make-network-connected	1319-number-of-operations-to-make-network-connected
1331-rank-transform-of-an-array	1331-rank-transform-of-an-array
1346-check-if-n-and-its-double-exist	1346-check-if-n-and-its-double-exist
1358-number-of-substrings-containing-all-three-characters	1358-number-of-substrings-containing-all-three-characters
1373-maximum-sum-bst-in-binary-tree	1373-maximum-sum-bst-in-binary-tree
1394-find-lucky-integer-in-an-array	1394-find-lucky-integer-in-an-array
1464-maximum-product-of-two-elements-in-an-array	1464-maximum-product-of-two-elements-in-an-array
1475-final-prices-with-a-special-discount-in-a-shop	1475-final-prices-with-a-special-discount-in-a-shop
1486-xor-operation-in-an-array	1486-xor-operation-in-an-array
1631-path-with-minimum-effort	1631-path-with-minimum-effort
1732-find-the-highest-altitude	1732-find-the-highest-altitude
1748-sum-of-unique-elements	1748-sum-of-unique-elements
1833-maximum-ice-cream-bars	1833-maximum-ice-cream-bars
1855-maximum-distance-between-a-pair-of-values	1855-maximum-distance-between-a-pair-of-values
1967-number-of-strings-that-appear-as-substrings-in-word	1967-number-of-strings-that-appear-as-substrings-in-word
1976-number-of-ways-to-arrive-at-destination	1976-number-of-ways-to-arrive-at-destination
1979-find-greatest-common-divisor-of-array	1979-find-greatest-common-divisor-of-array
2000-reverse-prefix-of-word	2000-reverse-prefix-of-word
2078-two-furthest-houses-with-different-colors	2078-two-furthest-houses-with-different-colors
2095-delete-the-middle-node-of-a-linked-list	2095-delete-the-middle-node-of-a-linked-list
2161-partition-array-according-to-given-pivot	2161-partition-array-according-to-given-pivot
2302-count-subarrays-with-score-less-than-k	2302-count-subarrays-with-score-less-than-k
2390-removing-stars-from-a-string	2390-removing-stars-from-a-string
2410-maximum-matching-of-players-with-trainers	2410-maximum-matching-of-players-with-trainers
2540-minimum-common-value	2540-minimum-common-value
2553-separate-the-digits-in-an-array	2553-separate-the-digits-in-an-array
2574-left-and-right-sum-differences	2574-left-and-right-sum-differences

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Backtracking

Breadth-First Search

Counting

Divide and Conquer

Bit Manipulation

Simulation

String Matching

Matrix

Sliding Window

Prefix Sum

Sorting

Counting Sort

Monotonic Stack

Dynamic Programming

Union-Find

Graph Theory

Enumeration

Topological Sort

Heap (Priority Queue)

Number Theory

Shortest Path

Rolling Hash

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