Submission #235253

# Submission time Handle Problem Language Result Execution time Memory
235253 2020-05-27T14:12:29 Z wwdd Tents (JOI18_tents) C++14
100 / 100
319 ms 72568 KB
#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
const int MN = 3030;
const ll M = 1e9+7;
ll mul(ll a, ll b) {return (a*b)%M;}
ll dp[MN][MN];
ll ds(int h, int w) {
	if(h == 0 || w == 0) {return 1;}
	if(h < 0 || w < 0) {return 0;}
	if(dp[h][w] != -1) {
		return dp[h][w];
	}
	ll res = ds(h-1,w)+mul(4*w,ds(h-1,w-1));
	if(h > 1) {
		res += mul(w*(h-1),ds(h-2,w-1));
	}
	if(w > 1) {
		res += mul(w*(w-1)/2,ds(h-1,w-2));
	}
	res %= M;
	return dp[h][w] = res;
}
int main() {
	ll h,w;
	cin >> h >> w;
	memset(dp,-1,sizeof(dp));
	ll res = ds(h,w);
	res--;
	res = ((res%M)+M)%M;
	cout << res << '\n';
}
# Verdict Execution time Memory Grader output
1 Correct 39 ms 72192 KB Output is correct
2 Correct 38 ms 72188 KB Output is correct
3 Correct 40 ms 72184 KB Output is correct
4 Correct 40 ms 72184 KB Output is correct
5 Correct 41 ms 72184 KB Output is correct
6 Correct 40 ms 72188 KB Output is correct
7 Correct 41 ms 72184 KB Output is correct
8 Correct 40 ms 72184 KB Output is correct
9 Correct 41 ms 72192 KB Output is correct
10 Correct 42 ms 72184 KB Output is correct
11 Correct 40 ms 72244 KB Output is correct
12 Correct 42 ms 72192 KB Output is correct
# Verdict Execution time Memory Grader output
1 Correct 39 ms 72192 KB Output is correct
2 Correct 38 ms 72188 KB Output is correct
3 Correct 40 ms 72184 KB Output is correct
4 Correct 40 ms 72184 KB Output is correct
5 Correct 41 ms 72184 KB Output is correct
6 Correct 40 ms 72188 KB Output is correct
7 Correct 41 ms 72184 KB Output is correct
8 Correct 40 ms 72184 KB Output is correct
9 Correct 41 ms 72192 KB Output is correct
10 Correct 42 ms 72184 KB Output is correct
11 Correct 40 ms 72244 KB Output is correct
12 Correct 42 ms 72192 KB Output is correct
13 Correct 40 ms 72192 KB Output is correct
14 Correct 40 ms 72312 KB Output is correct
15 Correct 195 ms 72440 KB Output is correct
16 Correct 41 ms 72192 KB Output is correct
17 Correct 54 ms 72188 KB Output is correct
18 Correct 72 ms 72312 KB Output is correct
19 Correct 221 ms 72440 KB Output is correct
20 Correct 181 ms 72440 KB Output is correct
21 Correct 119 ms 72320 KB Output is correct
22 Correct 131 ms 72392 KB Output is correct
23 Correct 101 ms 72440 KB Output is correct
24 Correct 319 ms 72440 KB Output is correct
25 Correct 210 ms 72444 KB Output is correct
26 Correct 247 ms 72440 KB Output is correct
27 Correct 291 ms 72568 KB Output is correct