Longest Repeating Character Replacement
Explore how to solve the longest repeating character replacement problem by applying the sliding window technique. Understand how to identify the longest substring where all characters are the same after making limited character replacements. This lesson helps you develop an efficient approach to this common coding interview pattern using hands-on problem solving.
We'll cover the following...
Statement
Given a string, s, and an integer, k, find the length of the longest substring in s, where all characters are identical, after replacing, at most, k characters with any other uppercase English character.
Constraints:
s.lengthsconsists of only uppercase English characters.ks.length
Examples
Understand the problem
Let’s take a moment to make sure you’ve correctly understood the problem. The quiz below helps you check if you’re solving the correct problem:
Longest Repeating Character Replacement
What is the correct output for the following input values?
“ABAB”,
1
2
3
4
Figure it out!
We have a game for you to play. Rearrange the logical building blocks to develop a clearer understanding of how to solve this problem.
Try it yourself
Implement your solution in the following coding playground.
Need a nudge?
Explore these hints—each one is designed to guide you a step closer to the solution.
package mainfunc longestRepeatingCharacterReplacement(s string, k int) int {// Replace this placeholder return statement with your codereturn -1}