#include<bits/stdc++.h>
#define ll long long
#define pll pair<ll, ll>
#define pb push_back
#define mp make_pair
#define fi first
#define se second
#define ld long double
#define sz(a) ((ll)(a).size())
using namespace std;
const ll maxn=2005, Mod=1e9+7;
ll dp[maxn][maxn];
int main()
{
ios_base::sync_with_stdio(0);
cin.tie(0); cout.tie(0);
ll n, k; cin >> n >> k;
dp[0][0]=1;
for (ll i=1; i<=n; i++)
for (ll j=0; j<=k; j++)
{
dp[i][j]+=dp[i-1][j]*(j+1);
if (j) dp[i][j]+=dp[i-1][j-1]*(i-j);
dp[i][j]%=Mod;
}
cout << dp[n][k-1];
}
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
0 ms |
348 KB |
Output is correct |
2 |
Correct |
0 ms |
348 KB |
Output is correct |
3 |
Correct |
0 ms |
348 KB |
Output is correct |
4 |
Correct |
0 ms |
348 KB |
Output is correct |
5 |
Correct |
0 ms |
468 KB |
Output is correct |
6 |
Correct |
0 ms |
348 KB |
Output is correct |
7 |
Correct |
1 ms |
444 KB |
Output is correct |
8 |
Correct |
1 ms |
348 KB |
Output is correct |
9 |
Correct |
0 ms |
344 KB |
Output is correct |
10 |
Correct |
0 ms |
348 KB |
Output is correct |
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
0 ms |
348 KB |
Output is correct |
2 |
Correct |
0 ms |
348 KB |
Output is correct |
3 |
Correct |
0 ms |
348 KB |
Output is correct |
4 |
Correct |
0 ms |
348 KB |
Output is correct |
5 |
Correct |
0 ms |
468 KB |
Output is correct |
6 |
Correct |
0 ms |
348 KB |
Output is correct |
7 |
Correct |
1 ms |
444 KB |
Output is correct |
8 |
Correct |
1 ms |
348 KB |
Output is correct |
9 |
Correct |
0 ms |
344 KB |
Output is correct |
10 |
Correct |
0 ms |
348 KB |
Output is correct |
11 |
Correct |
1 ms |
860 KB |
Output is correct |
12 |
Correct |
1 ms |
1628 KB |
Output is correct |
13 |
Correct |
1 ms |
1624 KB |
Output is correct |
14 |
Correct |
1 ms |
1880 KB |
Output is correct |
15 |
Correct |
1 ms |
2140 KB |
Output is correct |
16 |
Correct |
1 ms |
2140 KB |
Output is correct |
17 |
Correct |
1 ms |
1372 KB |
Output is correct |
18 |
Correct |
1 ms |
1624 KB |
Output is correct |
19 |
Correct |
1 ms |
1116 KB |
Output is correct |
20 |
Correct |
0 ms |
464 KB |
Output is correct |
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
0 ms |
348 KB |
Output is correct |
2 |
Correct |
0 ms |
348 KB |
Output is correct |
3 |
Correct |
0 ms |
348 KB |
Output is correct |
4 |
Correct |
0 ms |
348 KB |
Output is correct |
5 |
Correct |
0 ms |
468 KB |
Output is correct |
6 |
Correct |
0 ms |
348 KB |
Output is correct |
7 |
Correct |
1 ms |
444 KB |
Output is correct |
8 |
Correct |
1 ms |
348 KB |
Output is correct |
9 |
Correct |
0 ms |
344 KB |
Output is correct |
10 |
Correct |
0 ms |
348 KB |
Output is correct |
11 |
Correct |
1 ms |
860 KB |
Output is correct |
12 |
Correct |
1 ms |
1628 KB |
Output is correct |
13 |
Correct |
1 ms |
1624 KB |
Output is correct |
14 |
Correct |
1 ms |
1880 KB |
Output is correct |
15 |
Correct |
1 ms |
2140 KB |
Output is correct |
16 |
Correct |
1 ms |
2140 KB |
Output is correct |
17 |
Correct |
1 ms |
1372 KB |
Output is correct |
18 |
Correct |
1 ms |
1624 KB |
Output is correct |
19 |
Correct |
1 ms |
1116 KB |
Output is correct |
20 |
Correct |
0 ms |
464 KB |
Output is correct |
21 |
Correct |
2 ms |
4440 KB |
Output is correct |
22 |
Correct |
3 ms |
4440 KB |
Output is correct |
23 |
Correct |
4 ms |
8024 KB |
Output is correct |
24 |
Correct |
5 ms |
8284 KB |
Output is correct |
25 |
Correct |
7 ms |
11868 KB |
Output is correct |
26 |
Correct |
7 ms |
12076 KB |
Output is correct |
27 |
Correct |
7 ms |
12124 KB |
Output is correct |
28 |
Correct |
3 ms |
5212 KB |
Output is correct |
29 |
Correct |
1 ms |
1232 KB |
Output is correct |
30 |
Correct |
7 ms |
11864 KB |
Output is correct |
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
0 ms |
348 KB |
Output is correct |
2 |
Correct |
0 ms |
348 KB |
Output is correct |
3 |
Correct |
0 ms |
348 KB |
Output is correct |
4 |
Correct |
0 ms |
348 KB |
Output is correct |
5 |
Correct |
0 ms |
468 KB |
Output is correct |
6 |
Correct |
0 ms |
348 KB |
Output is correct |
7 |
Correct |
1 ms |
444 KB |
Output is correct |
8 |
Correct |
1 ms |
348 KB |
Output is correct |
9 |
Correct |
0 ms |
344 KB |
Output is correct |
10 |
Correct |
0 ms |
348 KB |
Output is correct |
11 |
Correct |
1 ms |
860 KB |
Output is correct |
12 |
Correct |
1 ms |
1628 KB |
Output is correct |
13 |
Correct |
1 ms |
1624 KB |
Output is correct |
14 |
Correct |
1 ms |
1880 KB |
Output is correct |
15 |
Correct |
1 ms |
2140 KB |
Output is correct |
16 |
Correct |
1 ms |
2140 KB |
Output is correct |
17 |
Correct |
1 ms |
1372 KB |
Output is correct |
18 |
Correct |
1 ms |
1624 KB |
Output is correct |
19 |
Correct |
1 ms |
1116 KB |
Output is correct |
20 |
Correct |
0 ms |
464 KB |
Output is correct |
21 |
Correct |
2 ms |
4440 KB |
Output is correct |
22 |
Correct |
3 ms |
4440 KB |
Output is correct |
23 |
Correct |
4 ms |
8024 KB |
Output is correct |
24 |
Correct |
5 ms |
8284 KB |
Output is correct |
25 |
Correct |
7 ms |
11868 KB |
Output is correct |
26 |
Correct |
7 ms |
12076 KB |
Output is correct |
27 |
Correct |
7 ms |
12124 KB |
Output is correct |
28 |
Correct |
3 ms |
5212 KB |
Output is correct |
29 |
Correct |
1 ms |
1232 KB |
Output is correct |
30 |
Correct |
7 ms |
11864 KB |
Output is correct |
31 |
Runtime error |
21 ms |
16984 KB |
Execution killed with signal 11 |
32 |
Halted |
0 ms |
0 KB |
- |