LeetCode

LeetCode Topics

Array

0001-two-sum
0011-container-with-most-water
0015-3sum
0016-3sum-closest
0026-remove-duplicates-from-sorted-array
0027-remove-element
0042-trapping-rain-water
0045-jump-game-ii
0055-jump-game
0064-minimum-path-sum
0068-text-justification
0079-word-search
0080-remove-duplicates-from-sorted-array-ii
0085-maximal-rectangle
0088-merge-sorted-array
0121-best-time-to-buy-and-sell-stock
0122-best-time-to-buy-and-sell-stock-ii
1025-minimum-cost-for-tickets
1063-best-sightseeing-pair
1524-string-matching-in-an-array
1895-minimum-number-of-operations-to-move-all-balls-to-each-box
2292-counting-words-with-a-given-prefix
2358-number-of-ways-to-split-array
2691-count-vowel-strings-in-ranges
3309-count-prefix-and-suffix-pairs-i

Dynamic Programming

0005-longest-palindromic-substring
0032-longest-valid-parentheses
0042-trapping-rain-water
0045-jump-game-ii
0055-jump-game
0062-unique-paths
0064-minimum-path-sum
0085-maximal-rectangle
0121-best-time-to-buy-and-sell-stock
0122-best-time-to-buy-and-sell-stock-ii
1025-minimum-cost-for-tickets
1063-best-sightseeing-pair
2562-count-ways-to-build-good-strings

Hash Table

0001-two-sum
0003-longest-substring-without-repeating-characters
0012-integer-to-roman
0013-roman-to-integer
0017-letter-combinations-of-a-phone-number
3455-minimum-length-of-string-after-operations

Linked List

0002-add-two-numbers
0019-remove-nth-node-from-end-of-list

Math

0002-add-two-numbers
0007-reverse-integer
0009-palindrome-number
0012-integer-to-roman
0013-roman-to-integer
0062-unique-paths

Recursion

0002-add-two-numbers

String

0003-longest-substring-without-repeating-characters
0005-longest-palindromic-substring
0006-zigzag-conversion
0008-string-to-integer-atoi
0012-integer-to-roman
0013-roman-to-integer
0014-longest-common-prefix
0017-letter-combinations-of-a-phone-number
0028-find-the-index-of-the-first-occurrence-in-a-string
0032-longest-valid-parentheses
0058-length-of-last-word
0068-text-justification
0079-word-search
1524-string-matching-in-an-array
1537-maximum-score-after-splitting-a-string
1895-minimum-number-of-operations-to-move-all-balls-to-each-box
2221-check-if-a-parentheses-string-can-be-valid
2292-counting-words-with-a-given-prefix
2691-count-vowel-strings-in-ranges
3309-count-prefix-and-suffix-pairs-i
3455-minimum-length-of-string-after-operations

Sliding Window

0003-longest-substring-without-repeating-characters

Two Pointers

0005-longest-palindromic-substring
0011-container-with-most-water
0015-3sum
0016-3sum-closest
0019-remove-nth-node-from-end-of-list
0026-remove-duplicates-from-sorted-array
0027-remove-element
0028-find-the-index-of-the-first-occurrence-in-a-string
0042-trapping-rain-water
0080-remove-duplicates-from-sorted-array-ii
0088-merge-sorted-array

Greedy

0011-container-with-most-water
0045-jump-game-ii
0055-jump-game
0122-best-time-to-buy-and-sell-stock-ii
2221-check-if-a-parentheses-string-can-be-valid

Trie

0014-longest-common-prefix
3309-count-prefix-and-suffix-pairs-i

Sorting

0015-3sum
0016-3sum-closest
0088-merge-sorted-array

Backtracking

0017-letter-combinations-of-a-phone-number
0079-word-search
0113-path-sum-ii

String Matching

0028-find-the-index-of-the-first-occurrence-in-a-string
1524-string-matching-in-an-array
2292-counting-words-with-a-given-prefix
3309-count-prefix-and-suffix-pairs-i

Stack

0032-longest-valid-parentheses
0042-trapping-rain-water
0085-maximal-rectangle
2221-check-if-a-parentheses-string-can-be-valid

Monotonic Stack

0042-trapping-rain-water
0085-maximal-rectangle

Combinatorics

0062-unique-paths

Matrix

0064-minimum-path-sum
0079-word-search
0085-maximal-rectangle

Simulation

0068-text-justification

Prefix Sum

1537-maximum-score-after-splitting-a-string
1895-minimum-number-of-operations-to-move-all-balls-to-each-box
2358-number-of-ways-to-split-array
2691-count-vowel-strings-in-ranges

Tree

0102-binary-tree-level-order-traversal
0103-binary-tree-zigzag-level-order-traversal
0107-binary-tree-level-order-traversal-ii
0113-path-sum-ii

Breadth-First Search

0102-binary-tree-level-order-traversal
0103-binary-tree-zigzag-level-order-traversal
0107-binary-tree-level-order-traversal-ii

Binary Tree

0102-binary-tree-level-order-traversal
0103-binary-tree-zigzag-level-order-traversal
0107-binary-tree-level-order-traversal-ii
0113-path-sum-ii

Depth-First Search

0113-path-sum-ii

Rolling Hash

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

Hash Function

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

Counting

3455-minimum-length-of-string-after-operations