LeetCode 1806: Minimum Number of Operations to Reinitialize a Permutation Solution

Master LeetCode problem 1806 (Minimum Number of Operations to Reinitialize a Permutation), a medium challenge, with our optimized solutions in Java, C++, and Python. Explore detailed explanations, test your code in our interactive editor, and prepare for coding interviews.

1806. Minimum Number of Operations to Reinitialize a Permutation

Medium

Array Math Simulation

Problem Explanation

Explanation

To solve this problem, we can simulate the operations described in the problem statement. We start with the initial permutation and repeatedly apply the operations until we reach the initial permutation again. We keep track of the number of operations performed and return this count as the minimum number of operations required.

Algorithm:

Start with the initial permutation perm where perm[i] = i.
Create a new array arr of size n.
Perform the operations on perm to generate arr according to the given rules.
Assign arr to perm.
Increment the count of operations.
Repeat steps 3-5 until perm is equal to the initial permutation.
Return the count of operations.

Time Complexity: O(n) Space Complexity: O(n)

Solution Code

class Solution {
    public int reinitializePermutation(int n) {
        int[] perm = new int[n];
        for (int i = 0; i < n; i++) {
            perm[i] = i;
        }
        int[] arr = new int[n];
        int count = 0;
        while (true) {
            for (int i = 0; i < n; i++) {
                if (i % 2 == 0) {
                    arr[i] = perm[i / 2];
                } else {
                    arr[i] = perm[n / 2 + (i - 1) / 2];
                }
            }
            count++;
            perm = arr.clone();
            boolean isInitialPerm = true;
            for (int i = 0; i < n; i++) {
                if (perm[i] != i) {
                    isInitialPerm = false;
                    break;
                }
            }
            if (isInitialPerm) {
                break;
            }
        }
        return count;
    }
}

Try It Yourself

Loading code editor...

Frequently Asked Questions

How to solve LeetCode 1806 (Minimum Number of Operations to Reinitialize a Permutation)?

This page provides optimized solutions for LeetCode problem 1806 (Minimum Number of Operations to Reinitialize a Permutation) in Java, C++, and Python, along with a detailed explanation and an interactive code editor to test your code.

What is the time complexity of LeetCode 1806 (Minimum Number of Operations to Reinitialize a Permutation)?

The time complexity for LeetCode 1806 (Minimum Number of Operations to Reinitialize a Permutation) varies by solution. Check the detailed explanation section for specific complexities in Java, C++, and Python implementations.

Can I run code for LeetCode 1806 on DevExCode?

Yes, DevExCode provides an interactive code editor where you can write, test, and run your code for LeetCode 1806 in Java, C++, or Python.

Back to LeetCode Solutions