LeetCode

LeetCode Topics

Array

0034-find-first-and-last-position-of-element-in-sorted-array
0035-search-insert-position
0073-set-matrix-zeroes
0368-largest-divisible-subset
0416-partition-equal-subset-sum
0925-construct-binary-tree-from-preorder-and-postorder-traversal
0945-snakes-and-ladders
1049-minimum-domino-rotations-for-equal-row
1227-number-of-equivalent-domino-pairs
1335-maximum-candies-allocated-to-k-children
1364-tuple-with-same-product
1424-maximum-candies-you-can-get-from-boxes
1477-product-of-the-last-k-numbers
1631-number-of-sub-arrays-with-odd-sum
1791-richest-customer-wealth
1819-construct-the-lexicographically-largest-valid-sequence
1878-check-if-array-is-sorted-and-rotated
1927-maximum-ascending-subarray-sum
1993-sum-of-all-subset-xor-totals
2048-build-array-from-permutation
2107-find-unique-binary-string
2160-minimum-operations-to-make-a-uni-value-grid
2180-maximum-number-of-tasks-you-can-assign
2215-finding-3-digit-even-numbers
2220-find-all-possible-recipes-from-given-supplies
2237-longest-palindrome-by-concatenating-two-letter-words
2262-solving-questions-with-brainpower
2265-partition-array-according-to-given-pivot
2308-divide-array-into-equal-pairs
2448-count-number-of-bad-pairs
2473-max-sum-of-a-pair-with-equal-sum-of-digits
2478-longest-nice-subarray
2551-apply-operations-to-an-array
2588-maximum-number-of-points-from-grid-queries
2614-maximum-count-of-positive-integer-and-negative-integer
2690-house-robber-iv
2888-minimum-index-of-a-valid-split
3001-apply-operations-to-maximize-score
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
3194-find-words-containing-character
3227-find-missing-and-repeated-values
3321-type-of-triangle
3348-minimum-cost-walk-in-weighted-graph
3372-longest-strictly-increasing-or-strictly-decreasing-subarray
3429-special-array-i
3430-count-days-without-meetings
3434-find-the-number-of-distinct-colors-among-the-balls
3475-minimum-operations-to-make-binary-array-elements-equal-to-one-i
3483-alternating-groups-ii
3621-minimum-operations-to-make-array-values-equal-to-k
3627-find-minimum-time-to-reach-last-room-i
3628-find-minimum-time-to-reach-last-room-ii
3639-zero-array-transformation-i
3643-zero-array-transformation-ii
3647-zero-array-transformation-iii
3656-minimum-number-of-operations-to-make-elements-in-array-distinct
3657-check-if-grid-can-be-cut-into-sections

Hash Table

0073-set-matrix-zeroes
0925-construct-binary-tree-from-preorder-and-postorder-traversal
1160-letter-tile-possibilities
1227-number-of-equivalent-domino-pairs
1364-tuple-with-same-product
1387-find-elements-in-a-contaminated-binary-tree
1460-number-of-substrings-containing-all-three-characters
1915-check-if-one-string-swap-can-make-strings-equal
1986-largest-color-value-in-a-directed-graph
2107-find-unique-binary-string
2215-finding-3-digit-even-numbers
2220-find-all-possible-recipes-from-given-supplies
2237-longest-palindrome-by-concatenating-two-letter-words
2308-divide-array-into-equal-pairs
2434-design-a-number-container-system
2448-count-number-of-bad-pairs
2473-max-sum-of-a-pair-with-equal-sum-of-digits
2888-minimum-index-of-a-valid-split
3227-find-missing-and-repeated-values
3434-find-the-number-of-distinct-colors-among-the-balls
3569-count-of-substrings-containing-every-vowel-and-k-consonants-ii
3621-minimum-operations-to-make-array-values-equal-to-k
3630-total-characters-in-string-after-transformations-ii
3656-minimum-number-of-operations-to-make-elements-in-array-distinct

String

0868-push-dominoes
1093-recover-a-tree-from-preorder-traversal
1160-letter-tile-possibilities
1170-shortest-common-supersequence
1460-number-of-substrings-containing-all-three-characters
1516-the-k-th-lexicographical-string-of-all-happy-strings-of-length-n
1915-check-if-one-string-swap-can-make-strings-equal
2021-remove-all-occurrences-of-a-substring
2107-find-unique-binary-string
2220-find-all-possible-recipes-from-given-supplies
2237-longest-palindrome-by-concatenating-two-letter-words
2456-construct-smallest-number-from-di-string
2463-minimum-recolors-to-get-k-consecutive-black-blocks
3142-longest-unequal-adjacent-groups-subsequence-ii
3143-longest-unequal-adjacent-groups-subsequence-i
3194-find-words-containing-character
3243-count-the-number-of-powerful-integers
3447-clear-digits
3569-count-of-substrings-containing-every-vowel-and-k-consonants-ii
3630-total-characters-in-string-after-transformations-ii
3637-count-number-of-balanced-permutations

Counting

1160-letter-tile-possibilities
1227-number-of-equivalent-domino-pairs
1364-tuple-with-same-product
1915-check-if-one-string-swap-can-make-strings-equal
1986-largest-color-value-in-a-directed-graph
2237-longest-palindrome-by-concatenating-two-letter-words
2308-divide-array-into-equal-pairs
2448-count-number-of-bad-pairs
2614-maximum-count-of-positive-integer-and-negative-integer
3630-total-characters-in-string-after-transformations-ii

Simulation

2021-remove-all-occurrences-of-a-substring
2048-build-array-from-permutation
2265-partition-array-according-to-given-pivot
2551-apply-operations-to-an-array
3434-find-the-number-of-distinct-colors-among-the-balls
3447-clear-digits

Design

1387-find-elements-in-a-contaminated-binary-tree
1477-product-of-the-last-k-numbers
2434-design-a-number-container-system

Heap (Priority Queue)

2434-design-a-number-container-system
2473-max-sum-of-a-pair-with-equal-sum-of-digits
2588-maximum-number-of-points-from-grid-queries
3627-find-minimum-time-to-reach-last-room-i
3628-find-minimum-time-to-reach-last-room-ii
3647-zero-array-transformation-iii

Ordered Set

2434-design-a-number-container-system

Math

0368-largest-divisible-subset
1477-product-of-the-last-k-numbers
1631-number-of-sub-arrays-with-odd-sum
1889-check-if-number-is-a-sum-of-powers-of-three
1993-sum-of-all-subset-xor-totals
2160-minimum-operations-to-make-a-uni-value-grid
2448-count-number-of-bad-pairs
2610-closest-prime-numbers-in-range
2649-count-total-number-of-colored-cells
2802-find-the-punishment-number-of-an-integer
2998-count-symmetric-integers
3001-apply-operations-to-maximize-score
3172-divisible-and-non-divisible-sums-difference
3227-find-missing-and-repeated-values
3243-count-the-number-of-powerful-integers
3321-type-of-triangle
3630-total-characters-in-string-after-transformations-ii
3637-count-number-of-balanced-permutations

Stack

2021-remove-all-occurrences-of-a-substring
2456-construct-smallest-number-from-di-string
3001-apply-operations-to-maximize-score
3447-clear-digits

Sorting

0368-largest-divisible-subset
2160-minimum-operations-to-make-a-uni-value-grid
2180-maximum-number-of-tasks-you-can-assign
2215-finding-3-digit-even-numbers
2473-max-sum-of-a-pair-with-equal-sum-of-digits
2588-maximum-number-of-points-from-grid-queries
2888-minimum-index-of-a-valid-split
3001-apply-operations-to-maximize-score
3321-type-of-triangle
3430-count-days-without-meetings
3647-zero-array-transformation-iii
3657-check-if-grid-can-be-cut-into-sections

Data Stream

1477-product-of-the-last-k-numbers

Prefix Sum

1477-product-of-the-last-k-numbers
1631-number-of-sub-arrays-with-odd-sum
3475-minimum-operations-to-make-binary-array-elements-equal-to-one-i
3639-zero-array-transformation-i
3643-zero-array-transformation-ii
3647-zero-array-transformation-iii

Backtracking

1160-letter-tile-possibilities
1516-the-k-th-lexicographical-string-of-all-happy-strings-of-length-n
1819-construct-the-lexicographically-largest-valid-sequence
1993-sum-of-all-subset-xor-totals
2107-find-unique-binary-string
2456-construct-smallest-number-from-di-string
2802-find-the-punishment-number-of-an-integer

Greedy

1049-minimum-domino-rotations-for-equal-row
2180-maximum-number-of-tasks-you-can-assign
2237-longest-palindrome-by-concatenating-two-letter-words
2456-construct-smallest-number-from-di-string
3001-apply-operations-to-maximize-score
3143-longest-unequal-adjacent-groups-subsequence-i
3647-zero-array-transformation-iii

Tree

0925-construct-binary-tree-from-preorder-and-postorder-traversal
1093-recover-a-tree-from-preorder-traversal
1387-find-elements-in-a-contaminated-binary-tree
3645-maximize-the-number-of-target-nodes-after-connecting-trees-ii

Depth-First Search

1093-recover-a-tree-from-preorder-traversal
1387-find-elements-in-a-contaminated-binary-tree
2438-find-closest-node-to-given-two-nodes
2793-count-the-number-of-complete-components
3645-maximize-the-number-of-target-nodes-after-connecting-trees-ii

Breadth-First Search

0945-snakes-and-ladders
1387-find-elements-in-a-contaminated-binary-tree
1424-maximum-candies-you-can-get-from-boxes
2588-maximum-number-of-points-from-grid-queries
2793-count-the-number-of-complete-components
3645-maximize-the-number-of-target-nodes-after-connecting-trees-ii

Binary Tree

0925-construct-binary-tree-from-preorder-and-postorder-traversal
1093-recover-a-tree-from-preorder-traversal
1387-find-elements-in-a-contaminated-binary-tree

Divide and Conquer

0925-construct-binary-tree-from-preorder-and-postorder-traversal

Dynamic Programming

0368-largest-divisible-subset
0416-partition-equal-subset-sum
0806-domino-and-tromino-tiling
0868-push-dominoes
1170-shortest-common-supersequence
1631-number-of-sub-arrays-with-odd-sum
1986-largest-color-value-in-a-directed-graph
2090-number-of-ways-to-arrive-at-destination
2262-solving-questions-with-brainpower
3142-longest-unequal-adjacent-groups-subsequence-ii
3143-longest-unequal-adjacent-groups-subsequence-i
3243-count-the-number-of-powerful-integers
3630-total-characters-in-string-after-transformations-ii
3637-count-number-of-balanced-permutations

Two Pointers

0868-push-dominoes
2265-partition-array-according-to-given-pivot
2551-apply-operations-to-an-array
2588-maximum-number-of-points-from-grid-queries

Matrix

0073-set-matrix-zeroes
0945-snakes-and-ladders
1791-richest-customer-wealth
2160-minimum-operations-to-make-a-uni-value-grid
2588-maximum-number-of-points-from-grid-queries
3227-find-missing-and-repeated-values
3627-find-minimum-time-to-reach-last-room-i
3628-find-minimum-time-to-reach-last-room-ii

Number Theory

2610-closest-prime-numbers-in-range
3001-apply-operations-to-maximize-score

Sliding Window

1460-number-of-substrings-containing-all-three-characters
2463-minimum-recolors-to-get-k-consecutive-black-blocks
2478-longest-nice-subarray
3475-minimum-operations-to-make-binary-array-elements-equal-to-one-i
3483-alternating-groups-ii
3569-count-of-substrings-containing-every-vowel-and-k-consonants-ii

Binary Search

0034-find-first-and-last-position-of-element-in-sorted-array
0035-search-insert-position
1335-maximum-candies-allocated-to-k-children
2180-maximum-number-of-tasks-you-can-assign
2614-maximum-count-of-positive-integer-and-negative-integer
2690-house-robber-iv
3643-zero-array-transformation-ii

Bit Manipulation

1993-sum-of-all-subset-xor-totals
2308-divide-array-into-equal-pairs
2478-longest-nice-subarray
3348-minimum-cost-walk-in-weighted-graph
3475-minimum-operations-to-make-binary-array-elements-equal-to-one-i

Queue

2180-maximum-number-of-tasks-you-can-assign
3475-minimum-operations-to-make-binary-array-elements-equal-to-one-i

Union Find

2588-maximum-number-of-points-from-grid-queries
2793-count-the-number-of-complete-components
3348-minimum-cost-walk-in-weighted-graph

Graph

1424-maximum-candies-you-can-get-from-boxes
1986-largest-color-value-in-a-directed-graph
2090-number-of-ways-to-arrive-at-destination
2220-find-all-possible-recipes-from-given-supplies
2438-find-closest-node-to-given-two-nodes
2793-count-the-number-of-complete-components
3348-minimum-cost-walk-in-weighted-graph
3627-find-minimum-time-to-reach-last-room-i
3628-find-minimum-time-to-reach-last-room-ii

Topological Sort

1986-largest-color-value-in-a-directed-graph
2090-number-of-ways-to-arrive-at-destination
2220-find-all-possible-recipes-from-given-supplies

Shortest Path

2090-number-of-ways-to-arrive-at-destination
3627-find-minimum-time-to-reach-last-room-i
3628-find-minimum-time-to-reach-last-room-ii

Monotonic Stack

3001-apply-operations-to-maximize-score

Combinatorics

1993-sum-of-all-subset-xor-totals
3637-count-number-of-balanced-permutations

Enumeration

1993-sum-of-all-subset-xor-totals
2215-finding-3-digit-even-numbers
2998-count-symmetric-integers

Monotonic Queue

2180-maximum-number-of-tasks-you-can-assign

Memoization

1986-largest-color-value-in-a-directed-graph