LeetCode-Solutions

LeetCode Topics

Array

0001-two-sum
0015-3sum
0048-rotate-image
0905-sort-array-by-parity
0994-rotting-oranges

Hash Table

0001-two-sum
0003-longest-substring-without-repeating-characters
0013-roman-to-integer
0142-linked-list-cycle-ii
0987-vertical-order-traversal-of-a-binary-tree

Linked List

0002-add-two-numbers
0021-merge-two-sorted-lists
0023-merge-k-sorted-lists
0025-reverse-nodes-in-k-group
0061-rotate-list
0142-linked-list-cycle-ii

Math

0002-add-two-numbers
0013-roman-to-integer
0048-rotate-image

Recursion

0002-add-two-numbers
0010-regular-expression-matching
0021-merge-two-sorted-lists
0025-reverse-nodes-in-k-group

String

0003-longest-substring-without-repeating-characters
0005-longest-palindromic-substring
0008-string-to-integer-atoi
0010-regular-expression-matching
0013-roman-to-integer
0020-valid-parentheses

Sliding Window

0003-longest-substring-without-repeating-characters

Two Pointers

0005-longest-palindromic-substring
0015-3sum
0061-rotate-list
0142-linked-list-cycle-ii
0905-sort-array-by-parity

Dynamic Programming

0005-longest-palindromic-substring
0010-regular-expression-matching

Sorting

0015-3sum
0905-sort-array-by-parity
0987-vertical-order-traversal-of-a-binary-tree

Tree

0102-binary-tree-level-order-traversal
0987-vertical-order-traversal-of-a-binary-tree

Depth-First Search

0987-vertical-order-traversal-of-a-binary-tree

Breadth-First Search

0102-binary-tree-level-order-traversal
0987-vertical-order-traversal-of-a-binary-tree
0994-rotting-oranges

Binary Tree

0102-binary-tree-level-order-traversal
0987-vertical-order-traversal-of-a-binary-tree

Stack

0020-valid-parentheses

Matrix

0048-rotate-image
0994-rotting-oranges

Divide and Conquer

0023-merge-k-sorted-lists

Heap (Priority Queue)

0023-merge-k-sorted-lists

Merge Sort

0023-merge-k-sorted-lists