LeetCode 229. Majority Element II
Description https://leetcode.com/problems/majority-element-ii/ Given an integer array of size n, find all elements that appear more than ⌊ n/3 ⌋ times. Follow-up: Could you solve…
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LeetCode 814. Binary Tree Pruning
Description https://leetcode.com/problems/matrix-block-sum/ Given the root of a binary tree, return the same tree where every subtree (of the given tree) not containing a 1 has…
LeetCode 1314. Matrix Block Sum
Description https://leetcode.com/problems/matrix-block-sum/ Given a m x n matrix mat and an integer k, return a matrix answer where each answer[i][j] is the sum of all elements mat[r][c] for: i – k <=…
LeetCode 628. Maximum Product of Three Numbers
Description https://leetcode.com/problems/maximum-product-of-three-numbers/ Given an integer array nums, find three numbers whose product is maximum and return the maximum product. Example 1: Input:…
LeetCode 142. Linked List Cycle II
Description https://leetcode.com/problems/linked-list-cycle-ii/ Given a linked list, return the node where the cycle begins. If there is no cycle, return null. There…
LeetCode 1650. Lowest Common Ancestor of a Binary Tree III
Description https://leetcode.com/problems/lowest-common-ancestor-of-a-binary-tree-iii/ Given two nodes of a binary tree p and q, return their lowest common ancestor (LCA). Each node will have a reference to its…
Essential Interview Questions
Introduction This is a GoodTecher compiled list. Each question is a typical question for the category it represents. To solve…
LeetCode 859. Buddy Strings
Description https://leetcode.com/problems/find-k-length-substrings-with-no-repeated-characters/ Given two strings s and goal, return true if you can swap two letters in s so the result is equal to goal, otherwise, return false. Swapping…
LeetCode 1100. Find K-Length Substrings With No Repeated Characters
Description https://leetcode.com/problems/find-k-length-substrings-with-no-repeated-characters/ Given a string s, return the number of substrings of length k with no repeated characters. Example 1: Input: s =…
LeetCode 994. Rotting Oranges
Description https://leetcode.com/problems/rotting-oranges/ You are given an m x n grid where each cell can have one of three values: 0 representing an empty cell,…