#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
const int MAXN = 3010;
const int MOD = 1e9 + 7;
ll escolhe2(ll x){
return (x * (x-1))/2;
}
ll dp[MAXN][MAXN];
int H,W;
ll solve(int a,int b){
if(a < 0 || b < 0) return 0;
if(a == 0 || b == 0) return 1;
if(dp[a][b] != -1) return dp[a][b];
ll qtd = solve(a-1,b);
qtd += solve(a - 1,b - 2)*escolhe2(b);
qtd += 4*solve(a-1,b-1)*b;
qtd += solve(a - 2,b - 1)*b*(a-1);
if(a == H && b == W) qtd--;
qtd %= MOD;
return dp[a][b] = qtd;
}
int main(){
memset(dp,-1,sizeof(dp));
cin >> H >> W;
cout << solve(H,W) << endl;
return 0;
}
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Correct |
55 ms |
71288 KB |
Output is correct |
| 2 |
Correct |
57 ms |
71416 KB |
Output is correct |
| 3 |
Correct |
55 ms |
71416 KB |
Output is correct |
| 4 |
Correct |
64 ms |
71420 KB |
Output is correct |
| 5 |
Correct |
59 ms |
71516 KB |
Output is correct |
| 6 |
Correct |
55 ms |
71516 KB |
Output is correct |
| 7 |
Correct |
56 ms |
71516 KB |
Output is correct |
| 8 |
Correct |
57 ms |
71516 KB |
Output is correct |
| 9 |
Correct |
58 ms |
71516 KB |
Output is correct |
| 10 |
Correct |
56 ms |
71516 KB |
Output is correct |
| 11 |
Correct |
55 ms |
71516 KB |
Output is correct |
| 12 |
Correct |
59 ms |
71516 KB |
Output is correct |
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Correct |
55 ms |
71288 KB |
Output is correct |
| 2 |
Correct |
57 ms |
71416 KB |
Output is correct |
| 3 |
Correct |
55 ms |
71416 KB |
Output is correct |
| 4 |
Correct |
64 ms |
71420 KB |
Output is correct |
| 5 |
Correct |
59 ms |
71516 KB |
Output is correct |
| 6 |
Correct |
55 ms |
71516 KB |
Output is correct |
| 7 |
Correct |
56 ms |
71516 KB |
Output is correct |
| 8 |
Correct |
57 ms |
71516 KB |
Output is correct |
| 9 |
Correct |
58 ms |
71516 KB |
Output is correct |
| 10 |
Correct |
56 ms |
71516 KB |
Output is correct |
| 11 |
Correct |
55 ms |
71516 KB |
Output is correct |
| 12 |
Correct |
59 ms |
71516 KB |
Output is correct |
| 13 |
Correct |
54 ms |
71524 KB |
Output is correct |
| 14 |
Correct |
63 ms |
71664 KB |
Output is correct |
| 15 |
Correct |
232 ms |
71860 KB |
Output is correct |
| 16 |
Correct |
62 ms |
71860 KB |
Output is correct |
| 17 |
Correct |
79 ms |
71860 KB |
Output is correct |
| 18 |
Correct |
94 ms |
71860 KB |
Output is correct |
| 19 |
Correct |
259 ms |
71880 KB |
Output is correct |
| 20 |
Correct |
206 ms |
71880 KB |
Output is correct |
| 21 |
Correct |
167 ms |
71880 KB |
Output is correct |
| 22 |
Correct |
161 ms |
71880 KB |
Output is correct |
| 23 |
Correct |
118 ms |
71880 KB |
Output is correct |
| 24 |
Correct |
312 ms |
71920 KB |
Output is correct |
| 25 |
Correct |
225 ms |
71920 KB |
Output is correct |
| 26 |
Correct |
245 ms |
71920 KB |
Output is correct |
| 27 |
Correct |
290 ms |
71920 KB |
Output is correct |
