We are given string str. The goal is to count the number of substrings in str that have starting character same as character X and ending character same as character Y. For example, if input is “artact” and X=’a’ and Y=’t’, the substrings will be “art”, “act”, “artact”. The count ... Read More

We are given a string str. The goal is to count the number of substrings in str that have each character occurring utmost k times. For example if input is “abc” and k=1, the substrings will be “a”, “b”, “c”, “ab”, “bc”, “abc”.Let us understand with examples.Input − str=”abaefgf”Output − ... Read More

We are given a string str. The goal is to count the number of substrings in str that have the same starting and ending character. For example, if input is “baca” substrings will be “b”, “a”, “c”, “a”, “aca”. Total 5.Let us understand with examples.Input − str=”abaefgf”Output −Count of substrings ... Read More

We are given string str containing 0’s, 1’s, and 2’s only. The goal is to find all substrings of str that have equal numbers of 0’s 1’s and 2’s. If str is “12012”. Substrings with equal 0’s, 1’s, and 2’s will be “120”, “201” and “012”. The count will be ... Read More

We are given with two strings str_1 and str_2 as input. The goal is to find the count of strings same as str_2 that can be constructed using letters picked from str_1 from which each character is used just once.Note − All alphabets in both are in the same case.Let ... Read More

We are given a number N as input. The goal is to find all N digit numbers that have an odd number of 0’s as digits. The number also could have preceding zeros like in case of N=3 numbers included will be 000, 011, 012….990.Let us understand with examples.Input − ... Read More

We are given a number N as input. The goal is to find all N digit numbers that have an even number of 0’s as digits. The number also could have preceding zeros like in case of N=3 numbers included will be 001, 002, 003….010….so on.Let us understand with examples.Input ... Read More

We are given an input N. The goal is to find all pairs of A, B such that 1

We are given with a string of characters and the task is to calculate the count of pairs having both the elements as vowels. As we know there are five vowels in English alphabet i.e. a, i, e, o, u and other characters are known as Consonants.Input − string str ... Read More

We are given with an array of positive integer numbers and an integer variable k. The task is to calculate the count of the number of elements in an array which is divisible by the given value k.Input − int arr[] = {4, 2, 6, 1, 3, 8, 10, 9}, ... Read More