Submission

Score: 100

User: Catpao

Problemset: สุ่มสลับ

Language: cpp

Time: 0.003 second

Submitted On: 2026-10-04 22:15:40

#include<bits/stdc++.h>
using namespace std;
int fac(int n){
	int ans = 1;
	for(int i=2;i<=n;i++){
		ans = ans*i;
	}
	return ans;
}

int main()
{
	ios_base::sync_with_stdio(0);
	cin.tie(NULL);
	
	int n,sum = 1,k;
	cin>>n;
	string a;
	cin>>a;
	vector<char> b;
	for(int i=0;i<n;i++){
		char c = a[i];
		b.push_back(c);
	}
	sort(b.begin(), b.end());
	for(int i=0;i<n;i++){
		for(int j=0;j<b.size();j++){
			if(a[i] == b[j]){
				k = j;
				break;
			}
		}
		sum += k*fac(n-i-1);
		b.erase(find(b.begin(), b.end(), b[k]));
	}
	cout<<sum;
}