Leethub

LeetCode Topics

Array

0001-two-sum
0004-median-of-two-sorted-arrays
0011-container-with-most-water
0014-longest-common-prefix
0018-4sum
0026-remove-duplicates-from-sorted-array
0033-search-in-rotated-sorted-array
0034-find-first-and-last-position-of-element-in-sorted-array
0042-trapping-rain-water
0048-rotate-image
0049-group-anagrams
0053-maximum-subarray
0054-spiral-matrix
0055-jump-game
0056-merge-intervals
0057-insert-interval
0066-plus-one
0075-sort-colors
0080-remove-duplicates-from-sorted-array-ii
0121-best-time-to-buy-and-sell-stock
0128-longest-consecutive-sequence
0136-single-number
0152-maximum-product-subarray
0167-two-sum-ii-input-array-is-sorted
0169-majority-element
0209-minimum-size-subarray-sum
0217-contains-duplicate
0219-contains-duplicate-ii
0228-summary-ranges
0238-product-of-array-except-self
0268-missing-number
0287-find-the-duplicate-number
0303-range-sum-query-immutable
0347-top-k-frequent-elements
0349-intersection-of-two-arrays
0435-non-overlapping-intervals
0448-find-all-numbers-disappeared-in-an-array
0454-4sum-ii
0496-next-greater-element-i
0523-continuous-subarray-sum
0525-contiguous-array
0560-subarray-sum-equals-k
0628-maximum-product-of-three-numbers
0643-maximum-average-subarray-i
0704-binary-search
0724-find-pivot-index
0832-flipping-an-image
0867-transpose-matrix
0904-fruit-into-baskets
0977-squares-of-a-sorted-array
0992-subarrays-with-k-different-integers
1004-max-consecutive-ones-iii
1052-grumpy-bookstore-owner
1343-number-of-sub-arrays-of-size-k-and-average-greater-than-or-equal-to-threshold
1423-maximum-points-you-can-obtain-from-cards
1464-maximum-product-of-two-elements-in-an-array
1480-running-sum-of-1d-array
1732-find-the-highest-altitude
2006-count-number-of-pairs-with-absolute-difference-k
2029-stone-game-ix
2091-removing-minimum-and-maximum-from-array
2461-maximum-sum-of-distinct-subarrays-with-length-k
2996-smallest-missing-integer-greater-than-sequential-prefix-sum
3471-find-the-largest-almost-missing-integer
3568-minimum-moves-to-clean-the-classroom
3718-smallest-missing-multiple-of-k
3875-construct-uniform-parity-array-i
3903-smallest-stable-index-i

Two Pointers

0005-longest-palindromic-substring
0011-container-with-most-water
0018-4sum
0026-remove-duplicates-from-sorted-array
0028-find-the-index-of-the-first-occurrence-in-a-string
0042-trapping-rain-water
0075-sort-colors
0080-remove-duplicates-from-sorted-array-ii
0125-valid-palindrome
0167-two-sum-ii-input-array-is-sorted
0287-find-the-duplicate-number
0344-reverse-string
0345-reverse-vowels-of-a-string
0349-intersection-of-two-arrays
0392-is-subsequence
0443-string-compression
0567-permutation-in-string
0680-valid-palindrome-ii
0832-flipping-an-image
0977-squares-of-a-sorted-array

Greedy

0011-container-with-most-water
0055-jump-game
0435-non-overlapping-intervals
0680-valid-palindrome-ii
2029-stone-game-ix
2091-removing-minimum-and-maximum-from-array

Binary Search

0004-median-of-two-sorted-arrays
0033-search-in-rotated-sorted-array
0034-find-first-and-last-position-of-element-in-sorted-array
0167-two-sum-ii-input-array-is-sorted
0209-minimum-size-subarray-sum
0268-missing-number
0278-first-bad-version
0287-find-the-duplicate-number
0349-intersection-of-two-arrays
0704-binary-search
1004-max-consecutive-ones-iii

Divide and Conquer

0004-median-of-two-sorted-arrays
0053-maximum-subarray
0169-majority-element
0347-top-k-frequent-elements
0395-longest-substring-with-at-least-k-repeating-characters

Dynamic Programming

0005-longest-palindromic-substring
0042-trapping-rain-water
0053-maximum-subarray
0055-jump-game
0121-best-time-to-buy-and-sell-stock
0152-maximum-product-subarray
0392-is-subsequence
0435-non-overlapping-intervals

Hash Table

0001-two-sum
0003-longest-substring-without-repeating-characters
0049-group-anagrams
0076-minimum-window-substring
0128-longest-consecutive-sequence
0169-majority-element
0205-isomorphic-strings
0217-contains-duplicate
0219-contains-duplicate-ii
0242-valid-anagram
0268-missing-number
0290-word-pattern
0347-top-k-frequent-elements
0349-intersection-of-two-arrays
0383-ransom-note
0387-first-unique-character-in-a-string
0395-longest-substring-with-at-least-k-repeating-characters
0424-longest-repeating-character-replacement
0438-find-all-anagrams-in-a-string
0448-find-all-numbers-disappeared-in-an-array
0454-4sum-ii
0496-next-greater-element-i
0523-continuous-subarray-sum
0525-contiguous-array
0560-subarray-sum-equals-k
0567-permutation-in-string
0904-fruit-into-baskets
0992-subarrays-with-k-different-integers
2006-count-number-of-pairs-with-absolute-difference-k
2461-maximum-sum-of-distinct-subarrays-with-length-k
2996-smallest-missing-integer-greater-than-sequential-prefix-sum
3471-find-the-largest-almost-missing-integer
3568-minimum-moves-to-clean-the-classroom
3718-smallest-missing-multiple-of-k

Stack

0042-trapping-rain-water
0496-next-greater-element-i

Monotonic Stack

0042-trapping-rain-water
0496-next-greater-element-i

Sorting

0018-4sum
0049-group-anagrams
0056-merge-intervals
0075-sort-colors
0169-majority-element
0217-contains-duplicate
0242-valid-anagram
0268-missing-number
0347-top-k-frequent-elements
0349-intersection-of-two-arrays
0435-non-overlapping-intervals
0628-maximum-product-of-three-numbers
0977-squares-of-a-sorted-array
1464-maximum-product-of-two-elements-in-an-array
2996-smallest-missing-integer-greater-than-sequential-prefix-sum
3517-smallest-palindromic-rearrangement-i

Math

0048-rotate-image
0066-plus-one
0268-missing-number
0523-continuous-subarray-sum
0628-maximum-product-of-three-numbers
2029-stone-game-ix
3345-smallest-divisible-digit-product-i
3875-construct-uniform-parity-array-i

Heap (Priority Queue)

0347-top-k-frequent-elements
1464-maximum-product-of-two-elements-in-an-array

Sliding Window

0003-longest-substring-without-repeating-characters
0076-minimum-window-substring
0209-minimum-size-subarray-sum
0219-contains-duplicate-ii
0395-longest-substring-with-at-least-k-repeating-characters
0424-longest-repeating-character-replacement
0438-find-all-anagrams-in-a-string
0567-permutation-in-string
0643-maximum-average-subarray-i
0904-fruit-into-baskets
0992-subarrays-with-k-different-integers
1004-max-consecutive-ones-iii
1052-grumpy-bookstore-owner
1343-number-of-sub-arrays-of-size-k-and-average-greater-than-or-equal-to-threshold
1423-maximum-points-you-can-obtain-from-cards
2461-maximum-sum-of-distinct-subarrays-with-length-k

Prefix Sum

0209-minimum-size-subarray-sum
0238-product-of-array-except-self
0303-range-sum-query-immutable
0523-continuous-subarray-sum
0525-contiguous-array
0560-subarray-sum-equals-k
0724-find-pivot-index
1004-max-consecutive-ones-iii
1423-maximum-points-you-can-obtain-from-cards
1480-running-sum-of-1d-array
1732-find-the-highest-altitude
3903-smallest-stable-index-i

String

0003-longest-substring-without-repeating-characters
0005-longest-palindromic-substring
0014-longest-common-prefix
0028-find-the-index-of-the-first-occurrence-in-a-string
0049-group-anagrams
0058-length-of-last-word
0076-minimum-window-substring
0125-valid-palindrome
0205-isomorphic-strings
0242-valid-anagram
0290-word-pattern
0344-reverse-string
0345-reverse-vowels-of-a-string
0383-ransom-note
0387-first-unique-character-in-a-string
0392-is-subsequence
0395-longest-substring-with-at-least-k-repeating-characters
0424-longest-repeating-character-replacement
0438-find-all-anagrams-in-a-string
0443-string-compression
0567-permutation-in-string
0680-valid-palindrome-ii
3517-smallest-palindromic-rearrangement-i

Counting Sort

0169-majority-element
0347-top-k-frequent-elements
0383-ransom-note
0387-first-unique-character-in-a-string
0992-subarrays-with-k-different-integers
2006-count-number-of-pairs-with-absolute-difference-k
2029-stone-game-ix
3517-smallest-palindromic-rearrangement-i

Design

0303-range-sum-query-immutable

Bit Manipulation

0136-single-number
0268-missing-number
0287-find-the-duplicate-number
0832-flipping-an-image
3568-minimum-moves-to-clean-the-classroom

Quicksort

0056-merge-intervals

Interactive

0278-first-bad-version

Matrix

0048-rotate-image
0054-spiral-matrix
0832-flipping-an-image
0867-transpose-matrix
3568-minimum-moves-to-clean-the-classroom

Simulation

0054-spiral-matrix
0832-flipping-an-image
0867-transpose-matrix

Enumeration

3345-smallest-divisible-digit-product-i

Manacher

0005-longest-palindromic-substring

Minimax

2029-stone-game-ix

Game Theory

2029-stone-game-ix

Nim Game

2029-stone-game-ix

Zero-Sum Game

2029-stone-game-ix

String Matching

0028-find-the-index-of-the-first-occurrence-in-a-string

Z Algorithm

0028-find-the-index-of-the-first-occurrence-in-a-string

Knuth–Morris–Pratt Algorithm

0028-find-the-index-of-the-first-occurrence-in-a-string

Boyer–Moore String-Search Algorithm

0028-find-the-index-of-the-first-occurrence-in-a-string

Database

1757-recyclable-and-low-fat-products

Trie

0014-longest-common-prefix

Bucket Sort

0347-top-k-frequent-elements

Quickselect

0347-top-k-frequent-elements

Union-Find

0128-longest-consecutive-sequence

Boyer–Moore Majority Vote Algorithm

0169-majority-element

Breadth-First Search

3568-minimum-moves-to-clean-the-classroom

Queue

0387-first-unique-character-in-a-string