| # |
Submission time |
Handle |
Problem |
Language |
Result |
Execution time |
Memory |
| 77888 |
2018-10-01T04:11:27 Z |
gs14004 |
Tents (JOI18_tents) |
C++17 |
|
311 ms |
71856 KB |
#include <bits/stdc++.h>
using namespace std;
const int MAXN = 3005;
const int mod = 1e9 + 7;
typedef long long lint;
lint dp[MAXN][MAXN];
lint f(int x, int y){
if(y < 0 || x < 0) return 0;
if(x == 0) return 1;
if(~dp[x][y]) return dp[x][y];
lint ret = f(x-1, y);
ret += f(x-1, y-2) * (y * (y - 1) / 2);
ret += f(x-2, y-1) * y * (x - 1);
ret += f(x-1, y-1) * 4 * y;
return dp[x][y] = ret % mod;
}
int main(){
int n, m;
cin >> n >> m;
memset(dp, -1, sizeof(dp));
cout << (f(n, m) + mod - 1) % mod << endl;
}
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
60 ms |
71160 KB |
Output is correct |
| 2 |
Correct |
57 ms |
71304 KB |
Output is correct |
| 3 |
Correct |
62 ms |
71408 KB |
Output is correct |
| 4 |
Correct |
56 ms |
71452 KB |
Output is correct |
| 5 |
Correct |
55 ms |
71452 KB |
Output is correct |
| 6 |
Correct |
59 ms |
71452 KB |
Output is correct |
| 7 |
Correct |
56 ms |
71480 KB |
Output is correct |
| 8 |
Correct |
58 ms |
71480 KB |
Output is correct |
| 9 |
Correct |
58 ms |
71488 KB |
Output is correct |
| 10 |
Correct |
67 ms |
71632 KB |
Output is correct |
| 11 |
Correct |
58 ms |
71632 KB |
Output is correct |
| 12 |
Correct |
58 ms |
71632 KB |
Output is correct |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
60 ms |
71160 KB |
Output is correct |
| 2 |
Correct |
57 ms |
71304 KB |
Output is correct |
| 3 |
Correct |
62 ms |
71408 KB |
Output is correct |
| 4 |
Correct |
56 ms |
71452 KB |
Output is correct |
| 5 |
Correct |
55 ms |
71452 KB |
Output is correct |
| 6 |
Correct |
59 ms |
71452 KB |
Output is correct |
| 7 |
Correct |
56 ms |
71480 KB |
Output is correct |
| 8 |
Correct |
58 ms |
71480 KB |
Output is correct |
| 9 |
Correct |
58 ms |
71488 KB |
Output is correct |
| 10 |
Correct |
67 ms |
71632 KB |
Output is correct |
| 11 |
Correct |
58 ms |
71632 KB |
Output is correct |
| 12 |
Correct |
58 ms |
71632 KB |
Output is correct |
| 13 |
Correct |
59 ms |
71632 KB |
Output is correct |
| 14 |
Correct |
58 ms |
71640 KB |
Output is correct |
| 15 |
Correct |
203 ms |
71644 KB |
Output is correct |
| 16 |
Correct |
59 ms |
71644 KB |
Output is correct |
| 17 |
Correct |
73 ms |
71652 KB |
Output is correct |
| 18 |
Correct |
90 ms |
71652 KB |
Output is correct |
| 19 |
Correct |
231 ms |
71660 KB |
Output is correct |
| 20 |
Correct |
200 ms |
71664 KB |
Output is correct |
| 21 |
Correct |
136 ms |
71716 KB |
Output is correct |
| 22 |
Correct |
147 ms |
71800 KB |
Output is correct |
| 23 |
Correct |
116 ms |
71836 KB |
Output is correct |
| 24 |
Correct |
311 ms |
71840 KB |
Output is correct |
| 25 |
Correct |
240 ms |
71856 KB |
Output is correct |
| 26 |
Correct |
264 ms |
71856 KB |
Output is correct |
| 27 |
Correct |
300 ms |
71856 KB |
Output is correct |
