Submission

Score: 100

User: punzacp555

Problemset: สุ่มสลับ

Language: cpp

Time: 0.002 second

Submitted On: 2026-09-30 18:25:54

#include <bits/stdc++.h>
using namespace std;

int fact(int x) {
    int prod = 1;
    while(x > 0) prod *= x, x--;
    return prod;
}

int main() {
    cin.tie(0)->sync_with_stdio(0);
    int n;
    string s;
    cin >> n >> s;

    int ans = 1;

    for(int i=0; i<n; i++) {
        int cnt = 0;
        for(int j=i+1; j<n; j++) {
            cnt += s[i] > s[j];
        }
        ans += cnt * fact(n-i-1);
    }

    cout << ans;

    return 0;
}