답안 #235253

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
235253	2020-05-27T14:12:29 Z	wwdd	Tents (JOI18_tents)	C++14	100 / 100	319 ms	72568 KB

tents

#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';
}

Subtask #1

48.0 / 48.0

#	결과	실행 시간	메모리	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

Subtask #2

52.0 / 52.0

#	결과	실행 시간	메모리	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