LeetCode Topics

Math


0066-plus-one
0067-add-binary
0258-add-digits
0263-ugly-number
0367-valid-perfect-square
1266-minimum-time-visiting-all-points
1390-four-divisors
1680-concatenation-of-consecutive-binary-numbers
2946-matrix-similarity-after-cyclic-shifts
3047-find-the-largest-area-of-square-inside-two-rectangles
3761-minimum-absolute-distance-between-mirror-pairs
3783-mirror-distance-of-an-integer

Array


0001-two-sum
0066-plus-one
0073-set-matrix-zeroes
0075-sort-colors
0085-maximal-rectangle
0088-merge-sorted-array
0119-pascals-triangle-ii
0152-maximum-product-subarray
0300-longest-increasing-subsequence
0414-third-maximum-number
0744-find-smallest-letter-greater-than-target
0912-sort-an-array
0961-n-repeated-element-in-size-2n-array
1089-duplicate-zeros
1200-minimum-absolute-difference
1266-minimum-time-visiting-all-points
1292-maximum-side-length-of-a-square-with-sum-less-than-or-equal-to-threshold
1356-sort-integers-by-the-number-of-1-bits
1390-four-divisors
1408-string-matching-in-an-array
1458-max-dot-product-of-two-subsequences
1536-minimum-swaps-to-arrange-a-binary-grid
1582-special-positions-in-a-binary-matrix
1636-sort-array-by-increasing-frequency
1722-minimize-hamming-distance-after-swap-operations
1727-largest-submatrix-with-rearrangements
1752-check-if-array-is-sorted-and-rotated
1848-minimum-distance-to-the-target-element
1855-maximum-distance-between-a-pair-of-values
1877-minimize-maximum-pair-sum-in-array
1886-determine-whether-matrix-can-be-obtained-by-rotation
1895-largest-magic-square
1929-concatenation-of-array
1967-number-of-strings-that-appear-as-substrings-in-word
1975-maximum-matrix-sum
1980-find-unique-binary-string
1984-minimum-difference-between-highest-and-lowest-of-k-scores
2078-two-furthest-houses-with-different-colors
2206-divide-array-into-equal-pairs
2452-words-within-two-edits-of-dictionary
2515-shortest-distance-to-target-string-in-a-circular-array
2615-sum-of-distances
2815-max-pair-sum-in-an-array
2943-maximize-area-of-square-hole-in-grid
2946-matrix-similarity-after-cyclic-shifts
2975-maximum-square-area-by-removing-fences-from-a-field
2976-minimum-cost-to-convert-string-i
2977-minimum-cost-to-convert-string-ii
3010-divide-an-array-into-subarrays-with-minimum-cost-i
3047-find-the-largest-area-of-square-inside-two-rectangles
3285-find-indices-of-stable-mountains
3314-construct-the-minimum-bitwise-array-i
3315-construct-the-minimum-bitwise-array-ii
3379-transformed-array
3453-separate-squares-i
3488-closest-equal-element-queries
3507-minimum-pair-removal-to-sort-array-i
3510-minimum-pair-removal-to-sort-array-ii
3546-equal-sum-grid-partition-i
3634-minimum-removals-to-balance-array
3637-trionic-array-i
3643-flip-square-submatrix-vertically
3651-minimum-cost-path-with-teleportations
3653-xor-after-range-multiplication-queries-i
3719-longest-balanced-subarray-i
3740-minimum-distance-between-three-equal-elements-i
3761-minimum-absolute-distance-between-mirror-pairs

Hash Table


0001-two-sum
0003-longest-substring-without-repeating-characters
0073-set-matrix-zeroes
0865-smallest-subtree-with-all-the-deepest-nodes
0961-n-repeated-element-in-size-2n-array
1461-check-if-a-string-contains-all-binary-codes-of-size-k
1636-sort-array-by-increasing-frequency
1980-find-unique-binary-string
2206-divide-array-into-equal-pairs
2287-rearrange-characters-to-make-target-string
2615-sum-of-distances
2815-max-pair-sum-in-an-array
2975-maximum-square-area-by-removing-fences-from-a-field
3488-closest-equal-element-queries
3507-minimum-pair-removal-to-sort-array-i
3510-minimum-pair-removal-to-sort-array-ii
3719-longest-balanced-subarray-i
3740-minimum-distance-between-three-equal-elements-i
3761-minimum-absolute-distance-between-mirror-pairs

Two Pointers


0005-longest-palindromic-substring
0075-sort-colors
0088-merge-sorted-array
0557-reverse-words-in-a-string-iii
1089-duplicate-zeros
1855-maximum-distance-between-a-pair-of-values
1877-minimize-maximum-pair-sum-in-array
3643-flip-square-submatrix-vertically
3794-reverse-string-prefix

String


0003-longest-substring-without-repeating-characters
0005-longest-palindromic-substring
0008-string-to-integer-atoi
0032-longest-valid-parentheses
0067-add-binary
0557-reverse-words-in-a-string-iii
0657-robot-return-to-origin
0712-minimum-ascii-delete-sum-for-two-strings
1408-string-matching-in-an-array
1461-check-if-a-string-contains-all-binary-codes-of-size-k
1545-find-kth-bit-in-nth-binary-string
1689-partitioning-into-minimum-number-of-deci-binary-numbers
1758-minimum-changes-to-make-alternating-binary-string
1784-check-if-binary-string-has-at-most-one-segment-of-ones
1888-minimum-number-of-flips-to-make-the-binary-string-alternating
1967-number-of-strings-that-appear-as-substrings-in-word
1980-find-unique-binary-string
2287-rearrange-characters-to-make-target-string
2452-words-within-two-edits-of-dictionary
2515-shortest-distance-to-target-string-in-a-circular-array
2839-check-if-strings-can-be-made-equal-with-operations-i
2976-minimum-cost-to-convert-string-i
2977-minimum-cost-to-convert-string-ii
3794-reverse-string-prefix

Counting


1356-sort-integers-by-the-number-of-1-bits
2206-divide-array-into-equal-pairs
2287-rearrange-characters-to-make-target-string

Sorting


0075-sort-colors
0088-merge-sorted-array
0414-third-maximum-number
0912-sort-an-array
1200-minimum-absolute-difference
1356-sort-integers-by-the-number-of-1-bits
1636-sort-array-by-increasing-frequency
1727-largest-submatrix-with-rearrangements
1877-minimize-maximum-pair-sum-in-array
1984-minimum-difference-between-highest-and-lowest-of-k-scores
2943-maximize-area-of-square-hole-in-grid
3010-divide-an-array-into-subarrays-with-minimum-cost-i
3634-minimum-removals-to-balance-array

Dynamic Programming


0005-longest-palindromic-substring
0032-longest-valid-parentheses
0085-maximal-rectangle
0119-pascals-triangle-ii
0152-maximum-product-subarray
0300-longest-increasing-subsequence
0712-minimum-ascii-delete-sum-for-two-strings
1411-number-of-ways-to-paint-n-3-grid
1458-max-dot-product-of-two-subsequences
1888-minimum-number-of-flips-to-make-the-binary-string-alternating
2977-minimum-cost-to-convert-string-ii
3129-find-all-possible-stable-binary-arrays-i
3651-minimum-cost-path-with-teleportations

Simulation


0067-add-binary
0258-add-digits
0657-robot-return-to-origin
1545-find-kth-bit-in-nth-binary-string
1680-concatenation-of-consecutive-binary-numbers
1929-concatenation-of-array
2946-matrix-similarity-after-cyclic-shifts
3379-transformed-array
3507-minimum-pair-removal-to-sort-array-i
3510-minimum-pair-removal-to-sort-array-ii
3653-xor-after-range-multiplication-queries-i

Binary Search


0300-longest-increasing-subsequence
0367-valid-perfect-square
0744-find-smallest-letter-greater-than-target
1292-maximum-side-length-of-a-square-with-sum-less-than-or-equal-to-threshold
1855-maximum-distance-between-a-pair-of-values
3453-separate-squares-i
3488-closest-equal-element-queries

Bit Manipulation


0067-add-binary
0190-reverse-bits
0401-binary-watch
0868-binary-gap
1009-complement-of-base-10-integer
1356-sort-integers-by-the-number-of-1-bits
1461-check-if-a-string-contains-all-binary-codes-of-size-k
1680-concatenation-of-consecutive-binary-numbers
2206-divide-array-into-equal-pairs
3314-construct-the-minimum-bitwise-array-i
3315-construct-the-minimum-bitwise-array-ii

Divide and Conquer


0190-reverse-bits
0912-sort-an-array
1382-balance-a-binary-search-tree
3653-xor-after-range-multiplication-queries-i
3719-longest-balanced-subarray-i

Heap (Priority Queue)


0912-sort-an-array
3507-minimum-pair-removal-to-sort-array-i
3510-minimum-pair-removal-to-sort-array-ii
3650-minimum-cost-path-with-edge-reversals

Merge Sort


0912-sort-an-array

Bucket Sort


0912-sort-an-array

Radix Sort


0912-sort-an-array

Counting Sort


0912-sort-an-array

String Matching


1408-string-matching-in-an-array

Stack


0032-longest-valid-parentheses
0085-maximal-rectangle

Greedy


1382-balance-a-binary-search-tree
1536-minimum-swaps-to-arrange-a-binary-grid
1689-partitioning-into-minimum-number-of-deci-binary-numbers
1727-largest-submatrix-with-rearrangements
1877-minimize-maximum-pair-sum-in-array
1975-maximum-matrix-sum
2078-two-furthest-houses-with-different-colors

Matrix


0073-set-matrix-zeroes
0085-maximal-rectangle
1292-maximum-side-length-of-a-square-with-sum-less-than-or-equal-to-threshold
1536-minimum-swaps-to-arrange-a-binary-grid
1582-special-positions-in-a-binary-matrix
1727-largest-submatrix-with-rearrangements
1886-determine-whether-matrix-can-be-obtained-by-rotation
1895-largest-magic-square
1975-maximum-matrix-sum
2946-matrix-similarity-after-cyclic-shifts
3546-equal-sum-grid-partition-i
3643-flip-square-submatrix-vertically
3651-minimum-cost-path-with-teleportations

Tree


0110-balanced-binary-tree
0865-smallest-subtree-with-all-the-deepest-nodes
1022-sum-of-root-to-leaf-binary-numbers
1161-maximum-level-sum-of-a-binary-tree
1339-maximum-product-of-splitted-binary-tree
1382-balance-a-binary-search-tree

Depth-First Search


0110-balanced-binary-tree
0865-smallest-subtree-with-all-the-deepest-nodes
1022-sum-of-root-to-leaf-binary-numbers
1161-maximum-level-sum-of-a-binary-tree
1339-maximum-product-of-splitted-binary-tree
1382-balance-a-binary-search-tree
1722-minimize-hamming-distance-after-swap-operations

Breadth-First Search


0865-smallest-subtree-with-all-the-deepest-nodes
1161-maximum-level-sum-of-a-binary-tree

Binary Tree


0110-balanced-binary-tree
0865-smallest-subtree-with-all-the-deepest-nodes
1022-sum-of-root-to-leaf-binary-numbers
1161-maximum-level-sum-of-a-binary-tree
1339-maximum-product-of-splitted-binary-tree
1382-balance-a-binary-search-tree

Monotonic Stack


0085-maximal-rectangle

Database


0176-second-highest-salary
0177-nth-highest-salary
0181-employees-earning-more-than-their-managers
0511-game-play-analysis-i
0577-employee-bonus
0607-sales-person
1050-actors-and-directors-who-cooperated-at-least-three-times
1251-average-selling-price
1327-list-the-products-ordered-in-a-period

Geometry


1266-minimum-time-visiting-all-points
3047-find-the-largest-area-of-square-inside-two-rectangles

Enumeration


2975-maximum-square-area-by-removing-fences-from-a-field
3010-divide-an-array-into-subarrays-with-minimum-cost-i
3546-equal-sum-grid-partition-i

Prefix Sum


1292-maximum-side-length-of-a-square-with-sum-less-than-or-equal-to-threshold
1895-largest-magic-square
2615-sum-of-distances
3129-find-all-possible-stable-binary-arrays-i
3546-equal-sum-grid-partition-i
3719-longest-balanced-subarray-i

Linked List


3507-minimum-pair-removal-to-sort-array-i
3510-minimum-pair-removal-to-sort-array-ii

Doubly-Linked List


3507-minimum-pair-removal-to-sort-array-i
3510-minimum-pair-removal-to-sort-array-ii

Ordered Set


3507-minimum-pair-removal-to-sort-array-i
3510-minimum-pair-removal-to-sort-array-ii

Sliding Window


0003-longest-substring-without-repeating-characters
1888-minimum-number-of-flips-to-make-the-binary-string-alternating
1984-minimum-difference-between-highest-and-lowest-of-k-scores
3634-minimum-removals-to-balance-array

Graph Theory


2976-minimum-cost-to-convert-string-i
2977-minimum-cost-to-convert-string-ii
3650-minimum-cost-path-with-edge-reversals

Shortest Path


2976-minimum-cost-to-convert-string-i
2977-minimum-cost-to-convert-string-ii
3650-minimum-cost-path-with-edge-reversals

Trie


2452-words-within-two-edits-of-dictionary
2977-minimum-cost-to-convert-string-ii

Binary Search Tree


1382-balance-a-binary-search-tree

Segment Tree


3719-longest-balanced-subarray-i

Backtracking


0401-binary-watch
1980-find-unique-binary-string

Rolling Hash


1461-check-if-a-string-contains-all-binary-codes-of-size-k

Hash Function


1461-check-if-a-string-contains-all-binary-codes-of-size-k

Recursion


1545-find-kth-bit-in-nth-binary-string

Number Theory


0258-add-digits

Union-Find


1722-minimize-hamming-distance-after-swap-operations

Name		Name	Last commit message	Last commit date
Latest commit History 490 Commits
0001-two-sum		0001-two-sum
0003-longest-substring-without-repeating-characters		0003-longest-substring-without-repeating-characters
0005-longest-palindromic-substring		0005-longest-palindromic-substring
0008-string-to-integer-atoi		0008-string-to-integer-atoi
0027-remove-element		0027-remove-element
0032-longest-valid-parentheses		0032-longest-valid-parentheses
0066-plus-one		0066-plus-one
0067-add-binary		0067-add-binary
0073-set-matrix-zeroes		0073-set-matrix-zeroes
0075-sort-colors		0075-sort-colors
0085-maximal-rectangle		0085-maximal-rectangle
0088-merge-sorted-array		0088-merge-sorted-array
0110-balanced-binary-tree		0110-balanced-binary-tree
0119-pascals-triangle-ii		0119-pascals-triangle-ii
0152-maximum-product-subarray		0152-maximum-product-subarray
0176-second-highest-salary		0176-second-highest-salary
0177-nth-highest-salary		0177-nth-highest-salary
0178-rank-scores		0178-rank-scores
0181-employees-earning-more-than-their-managers		0181-employees-earning-more-than-their-managers
0190-reverse-bits		0190-reverse-bits
0258-add-digits		0258-add-digits
0263-ugly-number		0263-ugly-number
0300-longest-increasing-subsequence		0300-longest-increasing-subsequence
0326-power-of-three		0326-power-of-three
0367-valid-perfect-square		0367-valid-perfect-square
0401-binary-watch		0401-binary-watch
0414-third-maximum-number		0414-third-maximum-number
0511-game-play-analysis-i		0511-game-play-analysis-i
0557-reverse-words-in-a-string-iii		0557-reverse-words-in-a-string-iii
0577-employee-bonus		0577-employee-bonus
0586-customer-placing-the-largest-number-of-orders		0586-customer-placing-the-largest-number-of-orders
0599-minimum-index-sum-of-two-lists		0599-minimum-index-sum-of-two-lists
0607-sales-person		0607-sales-person
0619-biggest-single-number		0619-biggest-single-number
0620-not-boring-movies		0620-not-boring-movies
0657-robot-return-to-origin		0657-robot-return-to-origin
0693-binary-number-with-alternating-bits		0693-binary-number-with-alternating-bits
0696-count-binary-substrings		0696-count-binary-substrings
0712-minimum-ascii-delete-sum-for-two-strings		0712-minimum-ascii-delete-sum-for-two-strings
0744-find-smallest-letter-greater-than-target		0744-find-smallest-letter-greater-than-target
0762-prime-number-of-set-bits-in-binary-representation		0762-prime-number-of-set-bits-in-binary-representation
0865-smallest-subtree-with-all-the-deepest-nodes		0865-smallest-subtree-with-all-the-deepest-nodes
0868-binary-gap		0868-binary-gap
0874-walking-robot-simulation		0874-walking-robot-simulation
0912-sort-an-array		0912-sort-an-array
0961-n-repeated-element-in-size-2n-array		0961-n-repeated-element-in-size-2n-array
1009-complement-of-base-10-integer		1009-complement-of-base-10-integer
1022-sum-of-root-to-leaf-binary-numbers		1022-sum-of-root-to-leaf-binary-numbers
1050-actors-and-directors-who-cooperated-at-least-three-times		1050-actors-and-directors-who-cooperated-at-least-three-times
1089-duplicate-zeros		1089-duplicate-zeros
1161-maximum-level-sum-of-a-binary-tree		1161-maximum-level-sum-of-a-binary-tree
1200-minimum-absolute-difference		1200-minimum-absolute-difference
1251-average-selling-price		1251-average-selling-price
1266-minimum-time-visiting-all-points		1266-minimum-time-visiting-all-points
1292-maximum-side-length-of-a-square-with-sum-less-than-or-equal-to-threshold		1292-maximum-side-length-of-a-square-with-sum-less-than-or-equal-to-threshold
1327-list-the-products-ordered-in-a-period		1327-list-the-products-ordered-in-a-period
1339-maximum-product-of-splitted-binary-tree		1339-maximum-product-of-splitted-binary-tree
1356-sort-integers-by-the-number-of-1-bits		1356-sort-integers-by-the-number-of-1-bits
1382-balance-a-binary-search-tree		1382-balance-a-binary-search-tree
1390-four-divisors		1390-four-divisors
1404-number-of-steps-to-reduce-a-number-in-binary-representation-to-one		1404-number-of-steps-to-reduce-a-number-in-binary-representation-to-one
1408-string-matching-in-an-array		1408-string-matching-in-an-array
1411-number-of-ways-to-paint-n-3-grid		1411-number-of-ways-to-paint-n-3-grid
1458-max-dot-product-of-two-subsequences		1458-max-dot-product-of-two-subsequences
1461-check-if-a-string-contains-all-binary-codes-of-size-k		1461-check-if-a-string-contains-all-binary-codes-of-size-k
1536-minimum-swaps-to-arrange-a-binary-grid		1536-minimum-swaps-to-arrange-a-binary-grid
1545-find-kth-bit-in-nth-binary-string		1545-find-kth-bit-in-nth-binary-string
1582-special-positions-in-a-binary-matrix		1582-special-positions-in-a-binary-matrix
1636-sort-array-by-increasing-frequency		1636-sort-array-by-increasing-frequency
1680-concatenation-of-consecutive-binary-numbers		1680-concatenation-of-consecutive-binary-numbers
1689-partitioning-into-minimum-number-of-deci-binary-numbers		1689-partitioning-into-minimum-number-of-deci-binary-numbers
1722-minimize-hamming-distance-after-swap-operations		1722-minimize-hamming-distance-after-swap-operations
1727-largest-submatrix-with-rearrangements		1727-largest-submatrix-with-rearrangements
1752-check-if-array-is-sorted-and-rotated		1752-check-if-array-is-sorted-and-rotated
1758-minimum-changes-to-make-alternating-binary-string		1758-minimum-changes-to-make-alternating-binary-string
1784-check-if-binary-string-has-at-most-one-segment-of-ones		1784-check-if-binary-string-has-at-most-one-segment-of-ones
1848-minimum-distance-to-the-target-element		1848-minimum-distance-to-the-target-element
1855-maximum-distance-between-a-pair-of-values		1855-maximum-distance-between-a-pair-of-values
1877-minimize-maximum-pair-sum-in-array		1877-minimize-maximum-pair-sum-in-array
1886-determine-whether-matrix-can-be-obtained-by-rotation		1886-determine-whether-matrix-can-be-obtained-by-rotation
1888-minimum-number-of-flips-to-make-the-binary-string-alternating		1888-minimum-number-of-flips-to-make-the-binary-string-alternating
1895-largest-magic-square		1895-largest-magic-square
1903-largest-odd-number-in-string		1903-largest-odd-number-in-string
1929-concatenation-of-array		1929-concatenation-of-array
1967-number-of-strings-that-appear-as-substrings-in-word		1967-number-of-strings-that-appear-as-substrings-in-word
1975-maximum-matrix-sum		1975-maximum-matrix-sum
1980-find-unique-binary-string		1980-find-unique-binary-string
1984-minimum-difference-between-highest-and-lowest-of-k-scores		1984-minimum-difference-between-highest-and-lowest-of-k-scores
2078-two-furthest-houses-with-different-colors		2078-two-furthest-houses-with-different-colors
2138-divide-a-string-into-groups-of-size-k		2138-divide-a-string-into-groups-of-size-k
2206-divide-array-into-equal-pairs		2206-divide-array-into-equal-pairs
2287-rearrange-characters-to-make-target-string		2287-rearrange-characters-to-make-target-string
2452-words-within-two-edits-of-dictionary		2452-words-within-two-edits-of-dictionary
2515-shortest-distance-to-target-string-in-a-circular-array		2515-shortest-distance-to-target-string-in-a-circular-array
2615-sum-of-distances		2615-sum-of-distances
2815-max-pair-sum-in-an-array		2815-max-pair-sum-in-an-array
2839-check-if-strings-can-be-made-equal-with-operations-i		2839-check-if-strings-can-be-made-equal-with-operations-i
2840-check-if-strings-can-be-made-equal-with-operations-ii		2840-check-if-strings-can-be-made-equal-with-operations-ii
2943-maximize-area-of-square-hole-in-grid		2943-maximize-area-of-square-hole-in-grid
2946-matrix-similarity-after-cyclic-shifts		2946-matrix-similarity-after-cyclic-shifts

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LeetCode Topics

Math

Array

Hash Table

Two Pointers

String

Counting

Sorting

Dynamic Programming

Simulation

Binary Search

Bit Manipulation

Divide and Conquer

Heap (Priority Queue)

Merge Sort

Bucket Sort

Radix Sort

Counting Sort

String Matching

Stack

Greedy

Matrix

Tree

Depth-First Search

Breadth-First Search

Binary Tree

Monotonic Stack

Database

Geometry

Enumeration

Prefix Sum

Linked List

Doubly-Linked List

Ordered Set

Sliding Window

Graph Theory

Shortest Path

Trie

Binary Search Tree

Segment Tree

Backtracking

Rolling Hash

Hash Function

Recursion

Number Theory

Union-Find

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