Leetcode

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

LeetCode Topics

Array

0001-two-sum
0011-container-with-most-water
0026-remove-duplicates-from-sorted-array
0031-next-permutation
0053-maximum-subarray
0134-gas-station
0136-single-number
0152-maximum-product-subarray
0169-majority-element
0189-rotate-array
0209-minimum-size-subarray-sum
0215-kth-largest-element-in-an-array
0268-missing-number
0283-move-zeroes
0287-find-the-duplicate-number
0485-max-consecutive-ones
0560-subarray-sum-equals-k
0898-transpose-matrix
0952-word-subsets
0954-maximum-sum-circular-subarray
1112-find-words-that-can-be-formed-by-characters
1360-maximum-length-of-a-concatenated-string-with-unique-characters
1485-minimum-cost-to-make-at-least-one-valid-path-in-a-grid
1570-final-prices-with-a-special-discount-in-a-shop
1878-check-if-array-is-sorted-and-rotated
1895-minimum-number-of-operations-to-move-all-balls-to-each-box
1917-maximum-average-pass-ratio
2271-rearrange-array-elements-by-sign
2292-counting-words-with-a-given-prefix
2465-shifting-letters-ii
2533-bitwise-xor-of-all-pairings
2685-first-completely-painted-row-or-column
2691-count-vowel-strings-in-ranges
2695-find-score-of-an-array-after-marking-all-elements
2766-find-the-prefix-common-array-of-two-arrays
2792-neighboring-bitwise-xor
3309-count-prefix-and-suffix-pairs-i
3555-final-array-state-after-k-multiplication-operations-i

Hash Table

0001-two-sum
0141-linked-list-cycle
0160-intersection-of-two-linked-lists
0169-majority-element
0268-missing-number
0389-find-the-difference
0560-subarray-sum-equals-k
0952-word-subsets
1112-find-words-that-can-be-formed-by-characters
1502-construct-k-palindrome-strings
2059-unique-length-3-palindromic-subsequences
2300-construct-string-with-repeat-limit
2685-first-completely-painted-row-or-column
2695-find-score-of-an-array-after-marking-all-elements
2766-find-the-prefix-common-array-of-two-arrays
3455-minimum-length-of-string-after-operations

Sorting

0169-majority-element
0215-kth-largest-element-in-an-array
0268-missing-number
0389-find-the-difference
2695-find-score-of-an-array-after-marking-all-elements

Heap (Priority Queue)

0215-kth-largest-element-in-an-array
1485-minimum-cost-to-make-at-least-one-valid-path-in-a-grid
1917-maximum-average-pass-ratio
2300-construct-string-with-repeat-limit
2695-find-score-of-an-array-after-marking-all-elements
3555-final-array-state-after-k-multiplication-operations-i

Simulation

0898-transpose-matrix
1806-count-of-matches-in-tournament
2271-rearrange-array-elements-by-sign
2695-find-score-of-an-array-after-marking-all-elements
3555-final-array-state-after-k-multiplication-operations-i

Greedy

0011-container-with-most-water
0134-gas-station
0680-valid-palindrome-ii
0957-minimum-add-to-make-parentheses-valid
1502-construct-k-palindrome-strings
1917-maximum-average-pass-ratio
2032-largest-odd-number-in-string
2221-check-if-a-parentheses-string-can-be-valid
2300-construct-string-with-repeat-limit
2509-minimize-xor

Math

0189-rotate-array
0268-missing-number
1806-count-of-matches-in-tournament
2032-largest-odd-number-in-string
3555-final-array-state-after-k-multiplication-operations-i

String

0028-find-the-index-of-the-first-occurrence-in-a-string
0038-count-and-say
0389-find-the-difference
0680-valid-palindrome-ii
0952-word-subsets
0957-minimum-add-to-make-parentheses-valid
1112-find-words-that-can-be-formed-by-characters
1360-maximum-length-of-a-concatenated-string-with-unique-characters
1502-construct-k-palindrome-strings
1895-minimum-number-of-operations-to-move-all-balls-to-each-box
2032-largest-odd-number-in-string
2059-unique-length-3-palindromic-subsequences
2221-check-if-a-parentheses-string-can-be-valid
2292-counting-words-with-a-given-prefix
2300-construct-string-with-repeat-limit
2346-largest-3-same-digit-number-in-string
2465-shifting-letters-ii
2691-count-vowel-strings-in-ranges
3309-count-prefix-and-suffix-pairs-i
3455-minimum-length-of-string-after-operations

Counting

0169-majority-element
1112-find-words-that-can-be-formed-by-characters
1502-construct-k-palindrome-strings
2300-construct-string-with-repeat-limit
3455-minimum-length-of-string-after-operations

Stack

0957-minimum-add-to-make-parentheses-valid
1570-final-prices-with-a-special-discount-in-a-shop
2221-check-if-a-parentheses-string-can-be-valid

Monotonic Stack

1570-final-prices-with-a-special-discount-in-a-shop

Prefix Sum

0209-minimum-size-subarray-sum
0560-subarray-sum-equals-k
1895-minimum-number-of-operations-to-move-all-balls-to-each-box
2059-unique-length-3-palindromic-subsequences
2465-shifting-letters-ii
2691-count-vowel-strings-in-ranges

Bit Manipulation

0136-single-number
0268-missing-number
0287-find-the-duplicate-number
0389-find-the-difference
1360-maximum-length-of-a-concatenated-string-with-unique-characters
2059-unique-length-3-palindromic-subsequences
2509-minimize-xor
2533-bitwise-xor-of-all-pairings
2766-find-the-prefix-common-array-of-two-arrays
2792-neighboring-bitwise-xor

Backtracking

1360-maximum-length-of-a-concatenated-string-with-unique-characters

Trie

3309-count-prefix-and-suffix-pairs-i

Rolling Hash

3309-count-prefix-and-suffix-pairs-i

String Matching

0028-find-the-index-of-the-first-occurrence-in-a-string
2292-counting-words-with-a-given-prefix
3309-count-prefix-and-suffix-pairs-i

Hash Function

3309-count-prefix-and-suffix-pairs-i

Matrix

0898-transpose-matrix
1485-minimum-cost-to-make-at-least-one-valid-path-in-a-grid
2685-first-completely-painted-row-or-column

Brainteaser

2533-bitwise-xor-of-all-pairings

Breadth-First Search

1485-minimum-cost-to-make-at-least-one-valid-path-in-a-grid

Graph

1485-minimum-cost-to-make-at-least-one-valid-path-in-a-grid

Shortest Path

1485-minimum-cost-to-make-at-least-one-valid-path-in-a-grid

Two Pointers

0011-container-with-most-water
0026-remove-duplicates-from-sorted-array
0028-find-the-index-of-the-first-occurrence-in-a-string
0031-next-permutation
0141-linked-list-cycle
0160-intersection-of-two-linked-lists
0189-rotate-array
0283-move-zeroes
0287-find-the-duplicate-number
0680-valid-palindrome-ii
2271-rearrange-array-elements-by-sign

Binary Search

0209-minimum-size-subarray-sum
0268-missing-number
0287-find-the-duplicate-number

Divide and Conquer

0053-maximum-subarray
0169-majority-element
0215-kth-largest-element-in-an-array
0954-maximum-sum-circular-subarray

Dynamic Programming

0053-maximum-subarray
0152-maximum-product-subarray
0954-maximum-sum-circular-subarray

Quickselect

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

Queue

0954-maximum-sum-circular-subarray

Monotonic Queue

0954-maximum-sum-circular-subarray

Sliding Window

0209-minimum-size-subarray-sum

Linked List

0021-merge-two-sorted-lists
0083-remove-duplicates-from-sorted-list
0141-linked-list-cycle
0160-intersection-of-two-linked-lists
0206-reverse-linked-list

Recursion

0021-merge-two-sorted-lists
0206-reverse-linked-list