Problem Statement The Merge k Sorted Lists LeetCode Solution – “Merge k Sorted Lists” states that given the array of k linked lists, where each linked list has its values sorted in ascending order. We need to merge all the k-linked lists into one single linked list and return the …
Problem Statement Partition Labels LeetCode Solution – You are given a string s. We want to partition the string into as many parts as possible so that each letter appears in at most one part. Note that the partition is done so that after concatenating all the parts in order, the …
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 The Valid Parentheses LeetCode Solution – “Valid Parentheses” states that you’re given a string containing just the characters ‘(‘, ‘)’, ‘{‘, ‘}’, ‘[‘ and ‘]’. We need to determine whether the input string is a valid string or not. A string is said to be a valid string if open brackets must be closed …
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 Evaluate Reverse Polish Notation LeetCode Solution – Evaluate the value of an arithmetic expression in Reverse Polish Notation. Valid operators are +, -, *, and /. Each operand may be an integer or another expression. Note that the division between two integers should truncate toward zero. It is guaranteed that the given …
Problem Statement Maximize Distance to Closest Person LeetCode Solution – You are given an array representing a row of seats where seats[i] = 1 represents a person sitting in the ith seat, and seats[i] = 0 represents that the ith seat is empty (0-indexed). There is at least one empty seat, and at least one person sitting. Alex wants to …
Problem Statement : Permutation in String Leetcode Solution – Given two strings s1 and s2, return true if s2 contains a permutation of s1, or false otherwise. In other words, return true if one of s1‘s permutations is the substring of s2. Example : Example 1 Input: s1 = “ab”, s2 = “eidbaooo” Output: true Explanation: s2 contains one permutation of s1 (“ba”). …
Problem Statement Binary Tree Maximum Path Sum LeetCode Solution – A path in a binary tree is a sequence of nodes where each pair of adjacent nodes in the sequence has an edge connecting them. A node can only appear in the sequence at most once. Note that the path does not need …
Problem Statement Product of Array Except Self LeetCode Solution – Given an integer array nums, return an array answer such that answer[i] is equal to the product of all the elements of nums except nums[i]. The product of any prefix or suffix of nums is guaranteed to fit in a 32-bit integer. You must write an algorithm that runs in O(n) time and without using the division …