In this problem, we need to find all missing binary strings of length N from the array. We can solve the problem by finding all permutations of a binary string of length N and checking which permutations are absent in the array. Here, we will see iterative and recursive approaches ... Read More

In this problem, we need to count the total number of substrings of string str containing exactly K distinct vowels. We can solve the problem in two different ways. The first approach is to traverse all substrings and count the number of vowels in each substring. We can also use ... Read More

In this problem, we need to find a total number of substrings of length K containing exactly K vowels. We will see two different approaches to solving the problem. We can use a naïve approach that checks the number of vowels in each substring of length K. Also, we can ... Read More

In this problem, we need th check whether the substring S1 appears after any occurrence of the substring S2 in the given string S. We can compare the starting index of S1 and S2 in the string S to solve the problem. Problem statement – We have given three substrings ... Read More

We have given two strings and need to check whether the given string's permutations exist such that one permutation can have a larger character than another permutation at the ith index. We can solve the problem by sorting the string and comparing each character of the string one by one. ... Read More

In this problem, we need to find the maximum length of the sub sequence with the same left and right rotations. The left rotation means moving all characters of the string in the left direction and the first character at the end. The right rotation means moving all string characters ... Read More

In this problem, we need to find the average value of the count of set bits after performing K operations of all choices on the given string. There can be a brute force approach to solve the problem, but we will use the probability principles to overcome the time ... Read More

In this problem, we need to find the total number of sub strings of length K containing at most X distinct vowels. We can solve the problem in two different ways. The first way is to get all sub strings and count distinct vowels in each sub string of length ... Read More

In this problem, we need to convert one binary string to another binary string by flipping the characters of the string. We can hold any set bit and flip other bits, and we need to count the total operation to achieve another string by doing it. We can solve the ... Read More

In this problem, we need to find the reversible equal substring of maximum length from the start and end of the string. The problem is very similar to finding the palindromic string. We can start traversing the string and traverse the string until characters from the start and end match. ... Read More