Problem Statement Number of Subsequences That Satisfy the Given Sum Condition LeetCode solution – says that Given an array of integers nums and an integer target. Return the number of non-empty subsequences nums such that the sum of the minimum and maximum element on it is less or equal to target. Since the answer may be too …
Problem Statement : Given an integer array of nums sorted in non-decreasing order, remove some duplicates in place such that each unique element appears at most twice. The relative order of the elements should be kept the same. Since it is impossible to change the length of the array in some languages, you must instead have …
Problem Statement The Next Permutation LeetCode Solution – “Next Permutation” states that given an array of integers which is a permutation of first n natural numbers. We need to find the next lexicographically smallest permutation of the given array. The replacement must be in-place and use only constant extra space. …
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 The Valid Palindrome II LeetCode Solution – “Valid Palindrome II” states that given the string s, we need to return true if s can be a palindrome string after deleting at most one character. Example: Input: s = “aba” Output: true Explanation: The input string is already palindrome, so there’s …
Problem Statement In this problem two arrays are given and we have to find out the intersection of this two arrays and return the resultant array. Each element in the result should appear as many times as it shows in both arrays. The result can be in any order. Example …
In the problem “Palindrome Linked List”, we have to check whether a given singly integer linked list is a palindrome or not. Example List = {1 -> 2 -> 3 -> 2 -> 1} true Explanation #1: The list is palindrome as all elements from the start and back are …
Problem Statement Given a string, we have to determine if it is a palindrome, considering only alphanumeric characters i.e. numbers and alphabets only. We also have to ignore cases for alphabet characters. Example “A man, a plan, a canal: Panama” true Explanation: “AmanaplanacanalPanama” is a valid palindrome. “race a car” …
Problem Statement In this problem a string is given and we have to reverse only the vowels of this string. Example “hello” “holle” Explanation: before reversing : “hello” after reversing : “holle” “leetcode” “leotcede” Explanation: Approach 1 (Using Stack) We just have to reverse the vowels present in input …
The problem Rotate List Leetcode Solution provides us a linked list and an integer. We are told to rotate the linked list to the right by k places. So if we rotate a linked list k places to the right, in each step we take the last element from the …