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 …
In the problem “Roman to Integer”, we are given a string representing some positive integer in its Roman numeral form. Roman numerals are represented by 7 characters that can be converted to integers using the following table: Note: The integer value of the given roman numeral will not exceed or …
Problem statement In the problem ” N-th Tribonacci Number” we are given a number n. Our task is to find out the N-th tribonacci number. The zeroth tribonacci number is 0. The first tribonacci number is 1. The second tribonacci number is 1. N-th tribonacci number is summation of (N-1- …
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 …
Problem Statement In path crossing problem a_string is given in which there are only four different characters ‘N’, ‘S’, ‘E’ or ‘W’ showing the movement of an object in one direction at a time by 1 unit. Object is initially at origin (0,0). We have to find out if the …
Problem Statement In Matrix Diagonal Sum problem a square matrix of integers is given. We have to calculate the sum of all the elements present at its diagonals i.e. elements at primary diagonal as well as secondary diagonal. Each element should be counted only once. Example mat = [[1,2,3], [4,5,6], …
Problem Statement In this problem an array of integers is given and we have to find out the count of total number of good pairs (a[i], a[j]) where a[i]=a[j]. Example nums = [1,2,3,1,1,3] 4 Explanation: There are 4 good pairs at indices (0,3), (0,4), (3,4), (2,5) . [1,1,1,1] 6 Explanation: …
As the title says, the goal is to find the third maximum integer in a given array of integers. Note that we need to find the distinct third maximum integer in the array. We return the maximum integer in the array when it has no distinct third maximum integer. Example …
The problem “Pow(x, n) Leetcode Solution” states that you are given two numbers, one of which is a floating-point number and another an integer. The integer denotes the exponent and the base is the floating-point number. We are told to find the value after evaluating the exponent over the base. …