Leetcode_problems

LeetCode Topics

Array

0001-two-sum
0004-median-of-two-sorted-arrays
0015-3sum
0033-search-in-rotated-sorted-array
0036-valid-sudoku
0049-group-anagrams
0074-search-a-2d-matrix
0121-best-time-to-buy-and-sell-stock
0128-longest-consecutive-sequence
0150-evaluate-reverse-polish-notation
0153-find-minimum-in-rotated-sorted-array
0167-two-sum-ii-input-array-is-sorted
0198-house-robber
0217-contains-duplicate
0238-product-of-array-except-self
0287-find-the-duplicate-number
0347-top-k-frequent-elements
0704-binary-search
0739-daily-temperatures
0875-koko-eating-bananas

Hash Table

0001-two-sum
0003-longest-substring-without-repeating-characters
0036-valid-sudoku
0049-group-anagrams
0128-longest-consecutive-sequence
0141-linked-list-cycle
0217-contains-duplicate
0242-valid-anagram
0347-top-k-frequent-elements
0424-longest-repeating-character-replacement
0567-permutation-in-string

Union-Find

0128-longest-consecutive-sequence

Sorting

0015-3sum
0049-group-anagrams
0217-contains-duplicate
0242-valid-anagram
0347-top-k-frequent-elements

String

0003-longest-substring-without-repeating-characters
0005-longest-palindromic-substring
0020-valid-parentheses
0049-group-anagrams
0125-valid-palindrome
0242-valid-anagram
0424-longest-repeating-character-replacement
0567-permutation-in-string

Divide and Conquer

0004-median-of-two-sorted-arrays
0347-top-k-frequent-elements

Heap (Priority Queue)

0347-top-k-frequent-elements

Bucket Sort

0347-top-k-frequent-elements

Counting

0347-top-k-frequent-elements

Quickselect

0347-top-k-frequent-elements

Prefix Sum

0238-product-of-array-except-self

Two Pointers

0005-longest-palindromic-substring
0015-3sum
0019-remove-nth-node-from-end-of-list
0125-valid-palindrome
0141-linked-list-cycle
0143-reorder-list
0167-two-sum-ii-input-array-is-sorted
0287-find-the-duplicate-number
0567-permutation-in-string

Dynamic Programming

0005-longest-palindromic-substring
0121-best-time-to-buy-and-sell-stock
0198-house-robber

Binary Search

0004-median-of-two-sorted-arrays
0033-search-in-rotated-sorted-array
0069-sqrtx
0074-search-a-2d-matrix
0153-find-minimum-in-rotated-sorted-array
0167-two-sum-ii-input-array-is-sorted
0287-find-the-duplicate-number
0367-valid-perfect-square
0704-binary-search
0875-koko-eating-bananas

Sliding Window

0003-longest-substring-without-repeating-characters
0424-longest-repeating-character-replacement
0567-permutation-in-string

Stack

0020-valid-parentheses
0143-reorder-list
0150-evaluate-reverse-polish-notation
0155-min-stack
0739-daily-temperatures

Design

0155-min-stack

Math

0002-add-two-numbers
0069-sqrtx
0150-evaluate-reverse-polish-notation
0367-valid-perfect-square

Monotonic Stack

0739-daily-temperatures

Matrix

0036-valid-sudoku
0074-search-a-2d-matrix

Linked List

0002-add-two-numbers
0019-remove-nth-node-from-end-of-list
0021-merge-two-sorted-lists
0141-linked-list-cycle
0143-reorder-list
0206-reverse-linked-list

Recursion

0002-add-two-numbers
0021-merge-two-sorted-lists
0143-reorder-list
0206-reverse-linked-list

Bit Manipulation

0287-find-the-duplicate-number

Tree

0100-same-tree
0102-binary-tree-level-order-traversal
0104-maximum-depth-of-binary-tree
0110-balanced-binary-tree
0226-invert-binary-tree
0543-diameter-of-binary-tree
0572-subtree-of-another-tree

Depth-First Search

0100-same-tree
0104-maximum-depth-of-binary-tree
0110-balanced-binary-tree
0226-invert-binary-tree
0543-diameter-of-binary-tree
0572-subtree-of-another-tree

Binary Tree

0100-same-tree
0102-binary-tree-level-order-traversal
0104-maximum-depth-of-binary-tree
0110-balanced-binary-tree
0226-invert-binary-tree
0543-diameter-of-binary-tree
0572-subtree-of-another-tree

Breadth-First Search

0100-same-tree
0102-binary-tree-level-order-traversal
0104-maximum-depth-of-binary-tree
0226-invert-binary-tree

String Matching

0572-subtree-of-another-tree

Hash Function

0572-subtree-of-another-tree