#include <bits/stdc++.h>
#pragma GCC optimize ("O2")
#pragma GCC optimize ("unroll-loops")
//#pragma GCC optimize("no-stack-protector,fast-math")
using namespace std;
typedef long long ll;
typedef long double ld;
typedef pair<int, int> pii;
typedef pair<pii, int> piii;
typedef pair<ll, ll> pll;
#define debug(x) cerr<<#x<<'='<<(x)<<endl;
#define debugp(x) cerr<<#x<<"= {"<<(x.first)<<", "<<(x.second)<<"}"<<endl;
#define debug2(x, y) cerr<<"{"<<#x<<", "<<#y<<"} = {"<<(x)<<", "<<(y)<<"}"<<endl;
#define debugv(v) {cerr<<#v<<" : ";for (auto x:v) cerr<<x<<' ';cerr<<endl;}
#define all(x) x.begin(), x.end()
#define pb push_back
#define kill(x) return cout<<x<<'\n', 0;
const ld eps=1e-7;
const int inf=1000000010;
const ll INF=10000000000000010LL;
const int mod = 1000000007;
const int MAXN = 400, LOG=20;
ll n, m, k, u, v, x, y, t, a, b, ans;
ll dp[MAXN][MAXN];
ll C[MAXN][MAXN];
int main(){
ios_base::sync_with_stdio(false);cin.tie(0);cout.tie(0);
//freopen("input.txt", "r", stdin);
//freopen("output.txt", "w", stdout);
for (int i=0; i<MAXN; i++){
C[i][0]=C[i][i]=1;
for (int j=1; j<i; j++) C[i][j]=(C[i-1][j] + C[i-1][j-1])%mod;
}
cin>>n;
dp[0][0]=1;
for (int i=1; i<=n; i++) for (int j=0; j<=n; j++){
for (int t=0; t<=j; t++) if (t!=i) dp[i][j]=(dp[i][j] + C[j][t]*dp[i-1][j-t])%mod;
}
ans=1;
for (int i=0; i<n; i++) ans=ans*n%mod;
ans=(ans-dp[n][n]+mod)%mod;
cout<<ans<<'\n';
return 0;
}
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
5 ms |
1528 KB |
Output is correct |
| 2 |
Correct |
5 ms |
1656 KB |
Output is correct |
| 3 |
Correct |
5 ms |
1656 KB |
Output is correct |
| 4 |
Correct |
5 ms |
1656 KB |
Output is correct |
| 5 |
Correct |
5 ms |
1656 KB |
Output is correct |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
5 ms |
1528 KB |
Output is correct |
| 2 |
Correct |
5 ms |
1656 KB |
Output is correct |
| 3 |
Correct |
5 ms |
1656 KB |
Output is correct |
| 4 |
Correct |
5 ms |
1656 KB |
Output is correct |
| 5 |
Correct |
5 ms |
1656 KB |
Output is correct |
| 6 |
Correct |
5 ms |
1656 KB |
Output is correct |
| 7 |
Correct |
5 ms |
1656 KB |
Output is correct |
| 8 |
Correct |
5 ms |
1656 KB |
Output is correct |
| 9 |
Correct |
5 ms |
1656 KB |
Output is correct |
| 10 |
Correct |
5 ms |
1656 KB |
Output is correct |
| 11 |
Correct |
6 ms |
1656 KB |
Output is correct |
| 12 |
Correct |
7 ms |
1656 KB |
Output is correct |
| 13 |
Correct |
6 ms |
1656 KB |
Output is correct |
| 14 |
Correct |
6 ms |
1656 KB |
Output is correct |
| 15 |
Correct |
6 ms |
1656 KB |
Output is correct |
| 16 |
Correct |
6 ms |
1656 KB |
Output is correct |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
5 ms |
1528 KB |
Output is correct |
| 2 |
Correct |
5 ms |
1656 KB |
Output is correct |
| 3 |
Correct |
5 ms |
1656 KB |
Output is correct |
| 4 |
Correct |
5 ms |
1656 KB |
Output is correct |
| 5 |
Correct |
5 ms |
1656 KB |
Output is correct |
| 6 |
Correct |
5 ms |
1656 KB |
Output is correct |
| 7 |
Correct |
5 ms |
1656 KB |
Output is correct |
| 8 |
Correct |
5 ms |
1656 KB |
Output is correct |
| 9 |
Correct |
5 ms |
1656 KB |
Output is correct |
| 10 |
Correct |
5 ms |
1656 KB |
Output is correct |
| 11 |
Correct |
6 ms |
1656 KB |
Output is correct |
| 12 |
Correct |
7 ms |
1656 KB |
Output is correct |
| 13 |
Correct |
6 ms |
1656 KB |
Output is correct |
| 14 |
Correct |
6 ms |
1656 KB |
Output is correct |
| 15 |
Correct |
6 ms |
1656 KB |
Output is correct |
| 16 |
Correct |
6 ms |
1656 KB |
Output is correct |
| 17 |
Correct |
81 ms |
2424 KB |
Output is correct |
| 18 |
Correct |
6 ms |
1784 KB |
Output is correct |
| 19 |
Correct |
22 ms |
2040 KB |
Output is correct |
| 20 |
Correct |
7 ms |
1656 KB |
Output is correct |
| 21 |
Correct |
109 ms |
2680 KB |
Output is correct |
| 22 |
Correct |
16 ms |
2040 KB |
Output is correct |
| 23 |
Correct |
6 ms |
1784 KB |
Output is correct |
| 24 |
Correct |
27 ms |
2168 KB |
Output is correct |
| 25 |
Correct |
20 ms |
2040 KB |
Output is correct |
| 26 |
Correct |
34 ms |
2168 KB |
Output is correct |
| 27 |
Correct |
152 ms |
2808 KB |
Output is correct |
| 28 |
Correct |
152 ms |
2680 KB |
Output is correct |
| 29 |
Correct |
154 ms |
2680 KB |
Output is correct |
| 30 |
Correct |
154 ms |
2680 KB |
Output is correct |
| 31 |
Correct |
157 ms |
2808 KB |
Output is correct |
| 32 |
Correct |
158 ms |
2680 KB |
Output is correct |
| 33 |
Correct |
158 ms |
2680 KB |
Output is correct |
| 34 |
Correct |
160 ms |
2684 KB |
Output is correct |
| 35 |
Correct |
161 ms |
2684 KB |
Output is correct |
| 36 |
Correct |
162 ms |
2680 KB |
Output is correct |
| 37 |
Correct |
163 ms |
2680 KB |
Output is correct |
