| # |
Submission time |
Handle |
Problem |
Language |
Result |
Execution time |
Memory |
| 1034135 |
2024-07-25T10:01:50 Z |
anHiep |
Tents (JOI18_tents) |
C++14 |
|
221 ms |
71244 KB |
#include <bits/stdc++.h>
using namespace std;
const int mod = 1e9 + 7;
#define int long long
int dp[3003][3003];
int dv;
int bp(int a, int b){
if(b == 0) return 1;
if(b == 1) return a;
int k = bp(a, b/2);
k = (k * k) % mod;
if(b % 2 == 0) return k;
return (a * k) % mod;
}
int cal(int i, int j){
if(i < 0 || j < 0) return 0;
if(dp[i][j] != -1) return dp[i][j];
int ans = 0;
ans = (ans + cal(i - 1, j)) % mod;
ans = (ans + cal(i - 1, j - 2) * j % mod * (j - 1) % mod * dv % mod) % mod;
ans = (ans + cal(i - 2, j - 1) * j % mod * (i - 1) % mod) % mod;
ans = (ans + cal(i - 1, j - 1) * j % mod * 4 % mod) % mod;
return dp[i][j] = ans;
}
signed main(){
int n, m;
cin >> n >> m;
dv = bp(2, mod - 2);
for(int i = 0; i <= n; i++) for(int j = 0; j <= m; j++) dp[i][j] = -1;
for(int i = 0; i <= n; i++) dp[i][0] = 1;
for(int i = 0; i <= m; i++) dp[0][i] = 1;
cout << (cal(n, m) - 1 + mod)%mod;
return 0;
}
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
1 ms |
348 KB |
Output is correct |
| 2 |
Correct |
0 ms |
348 KB |
Output is correct |
| 3 |
Correct |
0 ms |
604 KB |
Output is correct |
| 4 |
Correct |
1 ms |
1116 KB |
Output is correct |
| 5 |
Correct |
1 ms |
604 KB |
Output is correct |
| 6 |
Correct |
1 ms |
1372 KB |
Output is correct |
| 7 |
Correct |
1 ms |
960 KB |
Output is correct |
| 8 |
Correct |
1 ms |
1372 KB |
Output is correct |
| 9 |
Correct |
1 ms |
856 KB |
Output is correct |
| 10 |
Correct |
2 ms |
1728 KB |
Output is correct |
| 11 |
Correct |
0 ms |
348 KB |
Output is correct |
| 12 |
Correct |
3 ms |
2396 KB |
Output is correct |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
1 ms |
348 KB |
Output is correct |
| 2 |
Correct |
0 ms |
348 KB |
Output is correct |
| 3 |
Correct |
0 ms |
604 KB |
Output is correct |
| 4 |
Correct |
1 ms |
1116 KB |
Output is correct |
| 5 |
Correct |
1 ms |
604 KB |
Output is correct |
| 6 |
Correct |
1 ms |
1372 KB |
Output is correct |
| 7 |
Correct |
1 ms |
960 KB |
Output is correct |
| 8 |
Correct |
1 ms |
1372 KB |
Output is correct |
| 9 |
Correct |
1 ms |
856 KB |
Output is correct |
| 10 |
Correct |
2 ms |
1728 KB |
Output is correct |
| 11 |
Correct |
0 ms |
348 KB |
Output is correct |
| 12 |
Correct |
3 ms |
2396 KB |
Output is correct |
| 13 |
Correct |
0 ms |
348 KB |
Output is correct |
| 14 |
Correct |
3 ms |
9820 KB |
Output is correct |
| 15 |
Correct |
143 ms |
55388 KB |
Output is correct |
| 16 |
Correct |
3 ms |
4188 KB |
Output is correct |
| 17 |
Correct |
17 ms |
12876 KB |
Output is correct |
| 18 |
Correct |
35 ms |
17244 KB |
Output is correct |
| 19 |
Correct |
159 ms |
63308 KB |
Output is correct |
| 20 |
Correct |
125 ms |
51244 KB |
Output is correct |
| 21 |
Correct |
73 ms |
33852 KB |
Output is correct |
| 22 |
Correct |
84 ms |
35672 KB |
Output is correct |
| 23 |
Correct |
56 ms |
27484 KB |
Output is correct |
| 24 |
Correct |
221 ms |
71244 KB |
Output is correct |
| 25 |
Correct |
146 ms |
61528 KB |
Output is correct |
| 26 |
Correct |
172 ms |
66896 KB |
Output is correct |
| 27 |
Correct |
200 ms |
69460 KB |
Output is correct |
