제출 #1127995

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
1127995		Hurryup_7735	팩토리얼 세제곱들의 합 (YDX14_fact)	C++20	0 / 1	1 ms	328 KiB

fact

//Are You Challenging Me?!
#pragma GCC optimize("O3")
#include <bits/stdc++.h>

using namespace std;

#define ll long long
#define ld long double
#define endl '\n'
#define pb push_back
#define pf push_front
#define speedyboy ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
#define all(x) x.begin() , x.end()
#define allr(x) x.rbegin() , x.rend()
#define F first
#define S second
#define pll pair<ll , ll>
#define pss pair<string , string>
#define YES cout << "YES" << endl;
#define NO cout << "NO" << endl;


const ll sz = 5e5 + 5 , INF = 1e18 ,  MOD = 10;
ll fact[sz];

ll i , j , k , l;
void solve(){
    ll n , m , sum = 0;
    cin >> n >> m;
    ll mn = min(n , 4LL);
    for(i = 0 ; i <= mn ; i++){
        ll hasil = 1;
        for(j = 1 ; j <= m ; j++) hasil *= fact[i];
        sum += hasil % 10;
        sum %= 10;
    }
    cout << sum % 10 << endl;
}


signed main(){
    fact[0] = 1;
    for(i = 1 ; i <= 5 ; i++){
        fact[i] = fact[i - 1] * i;
    }
    speedyboy;
    //open;
    ll t = 1;
    //cin >> t;
    while(t--){
        solve();
    }
}

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