LeetCode Topics

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

LeetCode Topics

Hash Table


0001-two-sum
0003-longest-substring-without-repeating-characters
0013-roman-to-integer
0049-group-anagrams
0073-set-matrix-zeroes
0076-minimum-window-substring
0128-longest-consecutive-sequence
0141-linked-list-cycle
0169-majority-element
0205-isomorphic-strings
0219-contains-duplicate-ii
0229-majority-element-ii
0242-valid-anagram
0268-missing-number
0290-word-pattern
0349-intersection-of-two-arrays
0395-longest-substring-with-at-least-k-repeating-characters
0424-longest-repeating-character-replacement
0438-find-all-anagrams-in-a-string
0500-keyboard-row
0560-subarray-sum-equals-k
0599-minimum-index-sum-of-two-lists
0940-fruit-into-baskets
0966-binary-subarrays-with-sum
1023-time-based-key-value-store
1034-subarrays-with-k-different-integers
1370-count-number-of-nice-subarrays
1460-number-of-substrings-containing-all-three-characters

String


0003-longest-substring-without-repeating-characters
0005-longest-palindromic-substring
0006-zigzag-conversion
0013-roman-to-integer
0014-longest-common-prefix
0020-valid-parentheses
0028-find-the-index-of-the-first-occurrence-in-a-string
0043-multiply-strings
0049-group-anagrams
0058-length-of-last-word
0068-text-justification
0076-minimum-window-substring
0125-valid-palindrome
0151-reverse-words-in-a-string
0205-isomorphic-strings
0242-valid-anagram
0290-word-pattern
0345-reverse-vowels-of-a-string
0392-is-subsequence
0394-decode-string
0395-longest-substring-with-at-least-k-repeating-characters
0424-longest-repeating-character-replacement
0438-find-all-anagrams-in-a-string
0500-keyboard-row
0516-longest-palindromic-subsequence
0599-minimum-index-sum-of-two-lists
0647-palindromic-substrings
0680-valid-palindrome-ii
1023-time-based-key-value-store
1078-remove-outermost-parentheses
1250-longest-common-subsequence
1460-number-of-substrings-containing-all-three-characters
1542-consecutive-characters
1737-maximum-nesting-depth-of-the-parentheses
2021-remove-all-occurrences-of-a-substring
2032-largest-odd-number-in-string

Array


0001-two-sum
0004-median-of-two-sorted-arrays
0011-container-with-most-water
0015-3sum
0018-4sum
0026-remove-duplicates-from-sorted-array
0031-next-permutation
0033-search-in-rotated-sorted-array
0035-search-insert-position
0042-trapping-rain-water
0045-jump-game-ii
0048-rotate-image
0049-group-anagrams
0053-maximum-subarray
0054-spiral-matrix
0055-jump-game
0056-merge-intervals
0068-text-justification
0073-set-matrix-zeroes
0074-search-a-2d-matrix
0075-sort-colors
0080-remove-duplicates-from-sorted-array-ii
0081-search-in-rotated-sorted-array-ii
0088-merge-sorted-array
0121-best-time-to-buy-and-sell-stock
0122-best-time-to-buy-and-sell-stock-ii
0128-longest-consecutive-sequence
0135-candy
0136-single-number
0152-maximum-product-subarray
0153-find-minimum-in-rotated-sorted-array
0162-find-peak-element
0167-two-sum-ii-input-array-is-sorted
0169-majority-element
0189-rotate-array
0204-count-primes
0209-minimum-size-subarray-sum
0215-kth-largest-element-in-an-array
0219-contains-duplicate-ii
0229-majority-element-ii
0238-product-of-array-except-self
0240-search-a-2d-matrix-ii
0268-missing-number
0274-h-index
0283-move-zeroes
0287-find-the-duplicate-number
0322-coin-change
0349-intersection-of-two-arrays
0410-split-array-largest-sum
0455-assign-cookies
0485-max-consecutive-ones
0500-keyboard-row
0540-single-element-in-a-sorted-array
0560-subarray-sum-equals-k
0599-minimum-index-sum-of-two-lists
0605-can-place-flowers
0792-binary-search
0882-peak-index-in-a-mountain-array
0940-fruit-into-baskets
0954-maximum-sum-circular-subarray
0966-binary-subarrays-with-sum
1034-subarrays-with-k-different-integers
1046-max-consecutive-ones-iii
1370-count-number-of-nice-subarrays
1538-maximum-points-you-can-obtain-from-cards
1646-kth-missing-positive-number
1878-check-if-array-is-sorted-and-rotated
1966-frequency-of-the-most-frequent-element
2047-find-a-peak-element-ii
2271-rearrange-array-elements-by-sign
2614-maximum-count-of-positive-integer-and-negative-integer

Two Pointers


0005-longest-palindromic-substring
0011-container-with-most-water
0015-3sum
0018-4sum
0026-remove-duplicates-from-sorted-array
0028-find-the-index-of-the-first-occurrence-in-a-string
0031-next-permutation
0042-trapping-rain-water
0075-sort-colors
0080-remove-duplicates-from-sorted-array-ii
0088-merge-sorted-array
0125-valid-palindrome
0141-linked-list-cycle
0151-reverse-words-in-a-string
0167-two-sum-ii-input-array-is-sorted
0189-rotate-array
0283-move-zeroes
0287-find-the-duplicate-number
0345-reverse-vowels-of-a-string
0349-intersection-of-two-arrays
0392-is-subsequence
0455-assign-cookies
0647-palindromic-substrings
0680-valid-palindrome-ii
2271-rearrange-array-elements-by-sign

Greedy


0011-container-with-most-water
0045-jump-game-ii
0055-jump-game
0122-best-time-to-buy-and-sell-stock-ii
0135-candy
0410-split-array-largest-sum
0455-assign-cookies
0605-can-place-flowers
0670-maximum-swap
0680-valid-palindrome-ii
1966-frequency-of-the-most-frequent-element
2032-largest-odd-number-in-string

Sorting


0015-3sum
0018-4sum
0049-group-anagrams
0056-merge-intervals
0075-sort-colors
0088-merge-sorted-array
0169-majority-element
0215-kth-largest-element-in-an-array
0229-majority-element-ii
0242-valid-anagram
0268-missing-number
0274-h-index
0349-intersection-of-two-arrays
0455-assign-cookies
1966-frequency-of-the-most-frequent-element

Math


0007-reverse-integer
0009-palindrome-number
0013-roman-to-integer
0043-multiply-strings
0048-rotate-image
0050-powx-n
0189-rotate-array
0204-count-primes
0258-add-digits
0268-missing-number
0670-maximum-swap
1013-fibonacci-number
1370-count-number-of-nice-subarrays
1630-count-odd-numbers-in-an-interval-range
2032-largest-odd-number-in-string

Dynamic Programming


0005-longest-palindromic-substring
0042-trapping-rain-water
0045-jump-game-ii
0053-maximum-subarray
0055-jump-game
0121-best-time-to-buy-and-sell-stock
0122-best-time-to-buy-and-sell-stock-ii
0152-maximum-product-subarray
0322-coin-change
0392-is-subsequence
0410-split-array-largest-sum
0516-longest-palindromic-subsequence
0647-palindromic-substrings
0954-maximum-sum-circular-subarray
1013-fibonacci-number
1250-longest-common-subsequence

Union Find


0128-longest-consecutive-sequence

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
0940-fruit-into-baskets
0966-binary-subarrays-with-sum
1034-subarrays-with-k-different-integers
1046-max-consecutive-ones-iii
1370-count-number-of-nice-subarrays
1460-number-of-substrings-containing-all-three-characters
1538-maximum-points-you-can-obtain-from-cards
1966-frequency-of-the-most-frequent-element

Prefix Sum


0209-minimum-size-subarray-sum
0238-product-of-array-except-self
0410-split-array-largest-sum
0560-subarray-sum-equals-k
0966-binary-subarrays-with-sum
1046-max-consecutive-ones-iii
1370-count-number-of-nice-subarrays
1538-maximum-points-you-can-obtain-from-cards
1966-frequency-of-the-most-frequent-element

Binary Search


0004-median-of-two-sorted-arrays
0033-search-in-rotated-sorted-array
0035-search-insert-position
0074-search-a-2d-matrix
0081-search-in-rotated-sorted-array-ii
0153-find-minimum-in-rotated-sorted-array
0162-find-peak-element
0167-two-sum-ii-input-array-is-sorted
0209-minimum-size-subarray-sum
0240-search-a-2d-matrix-ii
0268-missing-number
0287-find-the-duplicate-number
0349-intersection-of-two-arrays
0410-split-array-largest-sum
0540-single-element-in-a-sorted-array
0792-binary-search
0882-peak-index-in-a-mountain-array
1023-time-based-key-value-store
1046-max-consecutive-ones-iii
1646-kth-missing-positive-number
1966-frequency-of-the-most-frequent-element
2047-find-a-peak-element-ii
2614-maximum-count-of-positive-integer-and-negative-integer

Counting


0169-majority-element
0229-majority-element-ii
1034-subarrays-with-k-different-integers
2614-maximum-count-of-positive-integer-and-negative-integer

Enumeration


0204-count-primes

Number Theory


0204-count-primes
0258-add-digits

Recursion


0050-powx-n
0206-reverse-linked-list
0394-decode-string
1013-fibonacci-number

Memoization


1013-fibonacci-number

Divide and Conquer


0004-median-of-two-sorted-arrays
0053-maximum-subarray
0169-majority-element
0215-kth-largest-element-in-an-array
0240-search-a-2d-matrix-ii
0395-longest-substring-with-at-least-k-repeating-characters
0954-maximum-sum-circular-subarray

Bit Manipulation


0136-single-number
0268-missing-number
0287-find-the-duplicate-number
0461-hamming-distance

Stack


0020-valid-parentheses
0042-trapping-rain-water
0394-decode-string
1078-remove-outermost-parentheses
1737-maximum-nesting-depth-of-the-parentheses
2021-remove-all-occurrences-of-a-substring

Matrix


0048-rotate-image
0054-spiral-matrix
0073-set-matrix-zeroes
0074-search-a-2d-matrix
0240-search-a-2d-matrix-ii
2047-find-a-peak-element-ii

Simulation


0043-multiply-strings
0054-spiral-matrix
0068-text-justification
0258-add-digits
2021-remove-all-occurrences-of-a-substring
2271-rearrange-array-elements-by-sign

String Matching


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

Queue


0954-maximum-sum-circular-subarray

Monotonic Queue


0954-maximum-sum-circular-subarray

Trie


0014-longest-common-prefix

Heap (Priority Queue)


0215-kth-largest-element-in-an-array

Quickselect


0215-kth-largest-element-in-an-array

Counting Sort


0274-h-index

Monotonic Stack


0042-trapping-rain-water

Design


1023-time-based-key-value-store

Linked List


0141-linked-list-cycle
0206-reverse-linked-list
0237-delete-node-in-a-linked-list

Breadth-First Search


0322-coin-change

Name		Name	Last commit message	Last commit date
Latest commit History 1,064 Commits
0001-two-sum		0001-two-sum
0003-longest-substring-without-repeating-characters		0003-longest-substring-without-repeating-characters
0004-median-of-two-sorted-arrays		0004-median-of-two-sorted-arrays
0005-longest-palindromic-substring		0005-longest-palindromic-substring
0006-zigzag-conversion		0006-zigzag-conversion
0007-reverse-integer		0007-reverse-integer
0009-palindrome-number		0009-palindrome-number
0011-container-with-most-water		0011-container-with-most-water
0013-roman-to-integer		0013-roman-to-integer
0014-longest-common-prefix		0014-longest-common-prefix
0015-3sum		0015-3sum
0018-4sum		0018-4sum
0020-valid-parentheses		0020-valid-parentheses
0026-remove-duplicates-from-sorted-array		0026-remove-duplicates-from-sorted-array
0028-find-the-index-of-the-first-occurrence-in-a-string		0028-find-the-index-of-the-first-occurrence-in-a-string
0031-next-permutation		0031-next-permutation
0033-search-in-rotated-sorted-array		0033-search-in-rotated-sorted-array
0035-search-insert-position		0035-search-insert-position
0042-trapping-rain-water		0042-trapping-rain-water
0043-multiply-strings		0043-multiply-strings
0045-jump-game-ii		0045-jump-game-ii
0048-rotate-image		0048-rotate-image
0049-group-anagrams		0049-group-anagrams
0050-powx-n		0050-powx-n
0053-maximum-subarray		0053-maximum-subarray
0054-spiral-matrix		0054-spiral-matrix
0055-jump-game		0055-jump-game
0056-merge-intervals		0056-merge-intervals
0058-length-of-last-word		0058-length-of-last-word
0068-text-justification		0068-text-justification
0073-set-matrix-zeroes		0073-set-matrix-zeroes
0074-search-a-2d-matrix		0074-search-a-2d-matrix
0075-sort-colors		0075-sort-colors
0076-minimum-window-substring		0076-minimum-window-substring
0080-remove-duplicates-from-sorted-array-ii		0080-remove-duplicates-from-sorted-array-ii
0081-search-in-rotated-sorted-array-ii		0081-search-in-rotated-sorted-array-ii
0088-merge-sorted-array		0088-merge-sorted-array
0121-best-time-to-buy-and-sell-stock		0121-best-time-to-buy-and-sell-stock
0122-best-time-to-buy-and-sell-stock-ii		0122-best-time-to-buy-and-sell-stock-ii
0125-valid-palindrome		0125-valid-palindrome
0128-longest-consecutive-sequence		0128-longest-consecutive-sequence
0135-candy		0135-candy
0136-single-number		0136-single-number
0141-linked-list-cycle		0141-linked-list-cycle
0151-reverse-words-in-a-string		0151-reverse-words-in-a-string
0152-maximum-product-subarray		0152-maximum-product-subarray
0153-find-minimum-in-rotated-sorted-array		0153-find-minimum-in-rotated-sorted-array
0162-find-peak-element		0162-find-peak-element
0167-two-sum-ii-input-array-is-sorted		0167-two-sum-ii-input-array-is-sorted
0169-majority-element		0169-majority-element
0189-rotate-array		0189-rotate-array
0204-count-primes		0204-count-primes
0205-isomorphic-strings		0205-isomorphic-strings
0206-reverse-linked-list		0206-reverse-linked-list
0209-minimum-size-subarray-sum		0209-minimum-size-subarray-sum
0215-kth-largest-element-in-an-array		0215-kth-largest-element-in-an-array
0219-contains-duplicate-ii		0219-contains-duplicate-ii
0229-majority-element-ii		0229-majority-element-ii
0237-delete-node-in-a-linked-list		0237-delete-node-in-a-linked-list
0238-product-of-array-except-self		0238-product-of-array-except-self
0240-search-a-2d-matrix-ii		0240-search-a-2d-matrix-ii
0242-valid-anagram		0242-valid-anagram
0258-add-digits		0258-add-digits
0268-missing-number		0268-missing-number
0274-h-index		0274-h-index
0283-move-zeroes		0283-move-zeroes
0287-find-the-duplicate-number		0287-find-the-duplicate-number
0290-word-pattern		0290-word-pattern
0322-coin-change		0322-coin-change
0344-reverse-string		0344-reverse-string
0345-reverse-vowels-of-a-string		0345-reverse-vowels-of-a-string
0349-intersection-of-two-arrays		0349-intersection-of-two-arrays
0392-is-subsequence		0392-is-subsequence
0394-decode-string		0394-decode-string
0395-longest-substring-with-at-least-k-repeating-characters		0395-longest-substring-with-at-least-k-repeating-characters
0410-split-array-largest-sum		0410-split-array-largest-sum
0424-longest-repeating-character-replacement		0424-longest-repeating-character-replacement
0438-find-all-anagrams-in-a-string		0438-find-all-anagrams-in-a-string
0455-assign-cookies		0455-assign-cookies
0461-hamming-distance		0461-hamming-distance
0485-max-consecutive-ones		0485-max-consecutive-ones
0500-keyboard-row		0500-keyboard-row
0516-longest-palindromic-subsequence		0516-longest-palindromic-subsequence
0540-single-element-in-a-sorted-array		0540-single-element-in-a-sorted-array
0560-subarray-sum-equals-k		0560-subarray-sum-equals-k
0599-minimum-index-sum-of-two-lists		0599-minimum-index-sum-of-two-lists
0605-can-place-flowers		0605-can-place-flowers
0647-palindromic-substrings		0647-palindromic-substrings
0670-maximum-swap		0670-maximum-swap
0680-valid-palindrome-ii		0680-valid-palindrome-ii
0792-binary-search		0792-binary-search
0882-peak-index-in-a-mountain-array		0882-peak-index-in-a-mountain-array
0940-fruit-into-baskets		0940-fruit-into-baskets
0954-maximum-sum-circular-subarray		0954-maximum-sum-circular-subarray
0966-binary-subarrays-with-sum		0966-binary-subarrays-with-sum
1013-fibonacci-number		1013-fibonacci-number
1023-time-based-key-value-store		1023-time-based-key-value-store
1034-subarrays-with-k-different-integers		1034-subarrays-with-k-different-integers
1046-max-consecutive-ones-iii		1046-max-consecutive-ones-iii
1078-remove-outermost-parentheses		1078-remove-outermost-parentheses

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LeetCode Topics

Hash Table

String

Array

Two Pointers

Greedy

Sorting

Math

Dynamic Programming

Union Find

Sliding Window

Prefix Sum

Binary Search

Counting

Enumeration

Number Theory

Recursion

Memoization

Divide and Conquer

Bit Manipulation

Stack

Matrix

Simulation

String Matching

Queue

Monotonic Queue

Trie

Heap (Priority Queue)

Quickselect

Counting Sort

Monotonic Stack

Design

Linked List

Breadth-First Search

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