Leetcode problem solutions

Best detailed solution explanations and code of Leetcode problems.

4. Median of Two Sorted Arrays Leetcode Solution in JavaScript (JS)

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0 Problem: Given two sorted arrays nums1 and nums2 of size m and n respectively, return the median of the two sorted arrays. The overall run time complexity should be O(log (m+n)). Example 1: Input: nums1 = [1,3], nums2 = [2] Output: 2.00000 Explanation: merged array = [1,2,3] and median is 2. Example 2: Input: nums1 = [1,2], nums2 = [3,4] Output: 2.50000 Explanation: merged array … Read more

3. Longest Substring Without Repeating Characters Leetcode solution in JavaScript (JS)

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0 Problem: Given a string s, find the length of the longest  substring without repeating characters. Example 1: Input: s = “abcabcbb” Output: 3 Explanation: The answer is “abc”, with the length of 3. Example 2: Input: s = “bbbbb” Output: 1 Explanation: The answer is “b”, with the length of 1. Example 3: Input: s = “pwwkew” … Read more

2. Add Two Numbers Leetcode solution in JavaScript (JS)

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0 Problem: You are given two non-empty linked lists representing two non-negative integers. The digits are stored in reverse order, and each of their nodes contains a single digit. Add the two numbers and return the sum as a linked list. You may assume the two numbers do not contain any leading zero, except the number 0 itself. Example … Read more

31. Next Permutation Leetcode solution in JavaScript (js)

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0 Problem A permutation of an array of integers is an arrangement of its members into a sequence or linear order. The next permutation of an array of integers is the next lexicographically greater permutation of its integer. More formally, if all the permutations of the array are sorted in one container according to their lexicographical order, then the next … Read more

1. Two Sum Leetcode Problem Solution in JavaScript (js)

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0 Problem Given an array of integers nums and an integer target, return indices of the two numbers such that they add up to target. You may assume that each input would have exactly one solution, and you may not use the same element twice. You can return the answer in any order. Example 1: Input: nums = [2,7,11,15], target = 9 Output: [0,1] … Read more

79. Word Search Leetcode solution in JavaScript (js)

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0 Problem Given an m x n grid of characters board and a string word, return true if word exists in the grid. The word can be constructed from letters of sequentially adjacent cells, where adjacent cells are horizontally or vertically neighboring. The same letter cell may not be used more than once. Example 1: Input: board = [[“A”,”B”,”C”,”E”],[“S”,”F”,”C”,”S”],[“A”,”D”,”E”,”E”]], word = “ABCCED” Output: true … Read more

21. Merge Two Sorted Lists in JavaScript (Leetcode Problem)

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0 Problem You are given the heads of two sorted linked lists list1 and list2. Merge the two lists in a one sorted list. The list should be made by splicing together the nodes of the first two lists. Return the head of the merged linked list. Example 1: Input: list1 = [1,2,4], list2 = [1,3,4] Output: [1,1,2,3,4,4] Example 2: Input: … Read more

Find pivot in array where left sum is equal to right sum in JavaScript

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0 Solution with n2 complexity Solution with nlogn complexity Solution with 3n (On) complexity Aadi AhlawatA freelance web developer with a decade of experience in creating high-quality, scalable web solutions. His expertise spans PHP, WordPress, Node.js, MySQL, MongoDB, and e-commerce development, ensuring a versatile approach to each project. Aadi’s commitment to client satisfaction is evident … Read more

Guess Number Higher or Lower in JavaScript (Leetcode Problem)

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0 We are playing the Guess Game. The game is as follows: I pick a number from 1 to n. You have to guess which number I picked. Every time you guess wrong, I will tell you whether the number I picked is higher or lower than your guess. You call a pre-defined API int guess(int num), which returns … Read more

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