Submission #41537

#	Time	Username	Problem	Language	Result	Execution time	Memory
41537		dudgh623	팩토리얼 세제곱들의 합 (YDX14_fact)	C++14	0 / 1	2 ms	716 KiB

fact

#include <iostream>
#include <memory.h>
#include <map>
#include <string>
#include <functional>
#include <vector>
using namespace std;

typedef long long ll;

const ll mod=100000000000000; 

int main() {
	ios::sync_with_stdio(false);
	ll n, k;
	cin >> n >> k;
	ll res =0;
	ll tmp = 0;
	ll a;
	for (ll i = 0; i <= n; i++)
	{
		tmp = tmp * i;
		if (i == 0)
			tmp = 1;
		a = 1;
		for (int j = 0; j < k; j++)
			a = (tmp*a) % mod;
		res = res + a;
	}
	

	while (1)
	{
		if (res == 0)
			return 0;
		if (res % 10) {
			cout << res % 10 << endl;
			return 0;
		}
		else
			res =res/ 10;
		
	}


}

• Subtask 1: 0 / 1