Algorithm

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LeetCode Topics

Hash Table

0001-two-sum
0003-longest-substring-without-repeating-characters
0217-contains-duplicate
0242-valid-anagram
0347-top-k-frequent-elements
0424-longest-repeating-character-replacement
0560-subarray-sum-equals-k

String

0003-longest-substring-without-repeating-characters
0125-valid-palindrome
0151-reverse-words-in-a-string
0242-valid-anagram
0424-longest-repeating-character-replacement
0937-reorder-data-in-log-files

Sorting

0215-kth-largest-element-in-an-array
0217-contains-duplicate
0242-valid-anagram
0347-top-k-frequent-elements
0937-reorder-data-in-log-files

Sliding Window

0003-longest-substring-without-repeating-characters
0424-longest-repeating-character-replacement

Array

0001-two-sum
0200-number-of-islands
0215-kth-largest-element-in-an-array
0217-contains-duplicate
0347-top-k-frequent-elements
0560-subarray-sum-equals-k
0704-binary-search
0875-koko-eating-bananas
0937-reorder-data-in-log-files

Divide and Conquer

0215-kth-largest-element-in-an-array
0347-top-k-frequent-elements

Heap (Priority Queue)

0215-kth-largest-element-in-an-array
0347-top-k-frequent-elements

Bucket Sort

0347-top-k-frequent-elements

Counting

0347-top-k-frequent-elements

Quickselect

0215-kth-largest-element-in-an-array
0347-top-k-frequent-elements

Tree

0098-validate-binary-search-tree

Depth-First Search

0098-validate-binary-search-tree
0200-number-of-islands

Binary Search Tree

0098-validate-binary-search-tree
0704-binary-search
0875-koko-eating-bananas

Binary Tree

0098-validate-binary-search-tree

Prefix Sum

0560-subarray-sum-equals-k

Breadth-First Search

0200-number-of-islands

Union Find

0200-number-of-islands

Matrix

0200-number-of-islands

Two Pointers

0125-valid-palindrome
0151-reverse-words-in-a-string

Stack

0232-implement-queue-using-stacks

Design

0232-implement-queue-using-stacks

Queue

0232-implement-queue-using-stacks