Longest Repeating Substring Problem Statement

Given a string str consisting of lowercase English alphabet letters, and an integer K, you are allowed to perform at most K operations on this string. An operation consists of changing any character of the string to any other lowercase English alphabet character.

Your task is to find the length of the longest substring consisting of repeating characters that can be obtained after performing these operations.

Example:

Input:

str = "aabc", K = 1

Output:

3

Explanation:

By changing ‘b’ to ‘a’, the longest repeating substring "aaa" is achieved.

Constraints:

1

Question

Longest Repeating Substring Problem Statement

Given a string str consisting of lowercase English alphabet letters, and an integer K, you are allowed to perform at most K operations on this string. An operation consists of changing any character of the string to any other lowercase English alphabet character.

Your task is to find the length of the longest substring consisting of repeating characters that can be obtained after performing these operations.

Example:

Input:

str = "aabc", K = 1

Output:

Explanation:

By changing ‘b’ to ‘a’, the longest repeating substring "aaa" is achieved.

Constraints:

1 <= T <= 100
1 <= |S| <= 5000
0 <= K <= |S|
Where |S| is the length of the given string.
Time Limit: 1 sec

Accepted Answer

Find the length of the longest substring consisting of repeating characters after performing K operations.

Iterate through the string and maintain a sliding window of characters.
Keep track of the frequency of characters in the window.
Update the window by changing characters to maximize the length of repeating substring.
Return the length of the longest repeating substring obtained.