Submission #334994

#	Time	Username	Problem	Language	Result	Execution time	Memory
334994		achibasadzishvili	Zapina (COCI20_zapina)	C++14	110 / 110	259 ms	3180 KiB

zapina

#include<bits/stdc++.h>
#define ll long long
#define f first
#define s second
#define pb push_back
using namespace std;
ll n,C[500][500],dp[500][500],mod=1000000007;
int main(){
    ios::sync_with_stdio(false);
    cin >> n;
    
    for(int i=0; i<=n; i++){
        C[i][0] = 1;
    }
    for(int i=1; i<=n; i++)
        for(int j=1; j<=n; j++){
            C[i][j] = (C[i - 1][j - 1] + C[i - 1][j]) % mod;
        }
    dp[0][0] = 1;
    for(int i=1; i<=n; i++){
        dp[i][0] = 1;
        for(int j=1; j<=n; j++){
            for(int k=0; k<=j; k++){
                if(k != i){
                    dp[i][j] += dp[i - 1][j - k] * C[j][k];
                    dp[i][j] %= mod;
                }
            }
        }
    }
    ll ans = (mod - dp[n][n]),k = 1;
    for(int i=1; i<=n; i++){
        k *= n;
        k %= mod;
    }
    ans = (ans + k) % mod;
    cout << ans << '\n';
    
    
    return 0;
}

• Subtask 1: 22 / 22
• Subtask 2: 33 / 33
• Subtask 3: 55 / 55