How to Solve Minimum Number of Operations to Make Word K- Periodic Leetcode Problem - Interview Coder Guide
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How to Solve Minimum Number of Operations to Make Word K- Periodic Problem

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Medium#3384
LeetCode Problem

Minimum Number of Operations to Make Word K-Periodic

You are given a string word of size n, and an integer k such that k divides n. In one operation, you can pick any two indices i and j, that are divisible by k, then replace the substring of length k s...

Hash TableStringCounting

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Problem Breakdown

Understanding the Minimum Number of Operations to Make Word K- Periodic Problem

Let's break down this LeetCode problem and understand what makes it challenging in interview settings.

Problem Statement

You are given a string word of size n, and an integer k such that k divides n. In one operation, you can pick any two indices i and j, that are divisible by k, then replace the substring of length k starting at i with the substring of length k starting at j. That is, replace the substring word[i..i + k - 1] with the substring word[j..j + k - 1]. Return the minimum number of operations required to make word k-periodic. We say that word is k-periodic if there is some string s of length k such that word can be obtained by concatenating s an arbitrary number of times. For example, if word == “ababab”, then word is 2-periodic for s = "ab".

MediumProblem #3384
LeetCode

Minimum Number of Operations to Make Word K-Periodic

Related Topics
Hash TableStringCounting
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Examples

Example 1
INPUT
word = "leetcodeleet", k = 4
OUTPUT
1
EXPLANATION

We can obtain a 4-periodic string by picking i = 4 and j = 0. After this operation, word becomes equal to "leetleetleet".

Example 2
INPUT
word = "leetcoleet", k = 2
OUTPUT
3
EXPLANATION

We can obtain a 2-periodic string by applying the operations in the table below. i j word 0 2 etetcoleet 4 0 etetetleet 6 0 etetetetet

Constraints

1 <= n == word.length <= 105
1 <= k <= word.length
k divides word.length.
word consists only of lowercase English letters.

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