Problem Statement The Minimum Path Sum LeetCode Solution – “Minimum Path Sum” says that given a n x m grid consisting of non-negative integers and we need to find a path from top-left to bottom right, which minimizes the sum of all numbers along the path. We can only move …
Problem Statement The Daily Temperatures Leetcode Solution: states that given an array of integers temperatures represents the daily temperatures, return an array answer such that answer[i] is the number of days you have to wait after the ith day to get a warmer temperature. If there is no future day for which this is possible, keep answer[i] == 0 instead. …
Problem Statement The LRU Cache LeetCode Solution – “LRU Cache” asks you to design a data structure that follows Least Recently Used (LRU) Cache We need to implement LRUCache class that has the following functions: LRUCache(int capacity): Initializes the LRU cache with positive size capacity. int get(int key): Return the value …
Problem Statement The Lowest Common Ancestor of a Binary Tree LeetCode Solution – “Lowest Common Ancestor of a Binary Tree” states that given the root of the binary tree and two nodes of the tree. We need to find the lowest common ancestor of these two nodes. The Lowest Common …
Problem Statement The Longest Substring Without Repeating Characters LeetCode Solution – states that given the string s. We need to find the longest substring without repeating characters. Example: Input: s = “abcabcbb” Output: 3 Explanation: The longest substring with no characters being repeated is of length 3. The string is: “abc”. Input: s = “bbbbb” …
Problem Statement The Trapping Rain Water LeetCode Solution – “Trapping Rain Water” states that given an array of heights which represents an elevation map where the width of each bar is 1. We need to find the amount of water trapped after rain. Example: Input: height = [0,1,0,2,1,0,1,3,2,1,2,1] Output: 6 Explanation: Check …
Problem Statement Reverse Words in a String III LeetCode Solution – We are given a string and are asked to reverse the order of characters in each word within a sentence while still preserving whitespace and initial word order. Examples & Explanations Example 1: Input: s = "Let's take LeetCode …
Problem Statement Remove Duplicates from Sorted List LeetCode Solution – We are given the head of a sorted linked list. We are asked to delete all the duplicates such that each element appears only once and return the linked list sorted as well. Examples & Explanations Example 1: Input: head …
Problem Statement First Unique Character in a String LeetCode Solution – Given a string s, find the first non-repeating character in it and return its index. If it does not exist, return -1. Example Test Case 1: Input: s = “leetcode” Output: 0 Test Case 2: Input: s = “aabb” Output: -1 Explanation …
Problem Statement: Invert Binary Tree LeetCode Solution – In this question, Given a root of any binary tree, the solution is required to invert the binary tree meaning the left tree should become the right tree and vice versa. Explanation We can ask ourselves which tree traversal would be …