plaese use C++ language You are given an unsorted permutation p1,p2,…,pn. To sort the permutation, you choose a constant k(k≥1) and do some operations on the permutation. In one operation, you can choose two integers i, j (1≤j<i≤n) such that i−j=k, then swap pi and pj.

Sure, here's a possible implementation in C++:

#include <iostream>
#include <vector>
using namespace std;

void sort_permutation(vector<int>& p) {
    int n = p.size();
    for (int k = 1; k <= n; k++) {
        for (int i = k+1; i <= n; i++) {
            if ((i-k) % k == 0) {
                int j = i-k;
                if (p[i-1] < p[j-1]) {
                    swap(p[i-1], p[j-1]);
                }
            }
        }
    }
}

int main() {
    vector<int> p = {4, 2, 3, 1, 5};
    sort_permutation(p);
    for (int x : p) {
        cout << x << " ";
    }
    cout << endl;
    return 0;
}

The function `sort_permutation` takes a vector `p` representing an unsorted permutation, and sorts it by performing swaps between elements that are k positions apart, for all values of k from 1 to n. The main function shows an example usage with the permutation {4, 2, 3, 1, 5}. The output should be {1, 2, 3, 4, 5}.