Hashing: Find the first repeating element and index in the array
Problem Statement: You are given an array with repeated elements. You need to find the first repeating element. Example: Input: arr = [4, 3,…
Hashing: Given two arrays, sort first array according to the order of second array
Problem Statement: You are given two arrays, you need to sort arr1 by the order of arr2. Example: Input: arr1 = [3, 2, 1, 1, 5] arr 2 = [1, 2,…
Hashing: Given 2 arrays, check if they are equal or not
Problem Statement: You are given 2 arrays, you need to check if 2 arrays are equal if they satisfy below 2 conditions: 1. Both array contains…
Hashing: Given a sorted array, count the absolute distinct count
Problem Statement: You are given a sorted array, you need to find the count of absolute distinct values in the array. Example: Input arr = [1,…
Hashing: Replace all the elements of the array by its rank in the array
Problem Statement: You are given an array of unique values, you need to replace the array with its corresponding rank. Rank meaning, the first…
Hashing: Given 2 strings, find uncommon characters
Problem Statement: You are given 2 strings, you need to find the uncommon characters between 2 strings. Example: Input: S1 = [abcde] S2 =…
Hashing: Given an array, find two non overlapping pairs having equal sum
Problem Statement: You are given an array. You need to find 2 non overlapping pairs whose sum are equal. Example: Input: arr = [1, 2, 3, 5, 4,…
Hashing: Given a string, check if it is isogram or not
Problem Statement: You are given a string, you need to check if the string is isogram or not. A string is isogram if, no letter occurs more…
Hashing: Given a array, you need to find a duplicate within k distance in the array.
Problem Statement: You are given an array and an integer K. You need to check if there exist 2 indices i and j, such that arr[i] == arr[j] and…
Hashing: Given an array, check if the array is a permutation of numbers from 1 to N.
Problem Statement: You are given an array, you need to find if the array is a permutation of 1 to N numbers. Example: Input: [1, 2, 4, 4, 3]…