Submission #236885

#	Submission time	Handle	Problem	Language	Result	Execution time	Memory
236885	2020-06-03T16:12:12 Z	islingr	Tents (JOI18_tents)	C++14	100 / 100	195 ms	72544 KB

tents

#include <iostream>
using namespace std;

#define rep(i, a, b) for (ll i = (a); i <= (b); ++i)

using ll = long long;

const int N = 3 << 10, M = 1e9 + 7;
ll dp[N][N];

signed main() {
	ios::sync_with_stdio(false);
	cin.tie(nullptr);

	int h, w; cin >> h >> w;
	rep(i, 0, h) dp[i][0] = 1;
	rep(j, 0, w) dp[0][j] = 1;
	rep(i, 1, h) {
		rep(j, 1, w) {
			auto add = [&](ll x) {
				dp[i][j] += x;
				if (M <= dp[i][j]) dp[i][j] -= M;
			};
			if (i != 1) add(i * (i - 1) / 2 % M * dp[i - 2][j - 1] % M);
			add(4 * i * dp[i - 1][j - 1] % M);
			add(dp[i][j - 1]);
			if (j != 1) add(i * (j - 1) % M * dp[i - 1][j - 2] % M);
		}
	}
	cout << (dp[h][w] + M - 1) % M;
}

Subtask #1

48.0 / 48.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	5 ms	384 KB	Output is correct
2	Correct	5 ms	384 KB	Output is correct
3	Correct	5 ms	512 KB	Output is correct
4	Correct	5 ms	1152 KB	Output is correct
5	Correct	5 ms	1024 KB	Output is correct
6	Correct	5 ms	1280 KB	Output is correct
7	Correct	5 ms	1024 KB	Output is correct
8	Correct	5 ms	1408 KB	Output is correct
9	Correct	5 ms	896 KB	Output is correct
10	Correct	6 ms	2688 KB	Output is correct
11	Correct	5 ms	512 KB	Output is correct
12	Correct	7 ms	2816 KB	Output is correct

Subtask #2

52.0 / 52.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	5 ms	384 KB	Output is correct
2	Correct	5 ms	384 KB	Output is correct
3	Correct	5 ms	512 KB	Output is correct
4	Correct	5 ms	1152 KB	Output is correct
5	Correct	5 ms	1024 KB	Output is correct
6	Correct	5 ms	1280 KB	Output is correct
7	Correct	5 ms	1024 KB	Output is correct
8	Correct	5 ms	1408 KB	Output is correct
9	Correct	5 ms	896 KB	Output is correct
10	Correct	6 ms	2688 KB	Output is correct
11	Correct	5 ms	512 KB	Output is correct
12	Correct	7 ms	2816 KB	Output is correct
13	Correct	5 ms	384 KB	Output is correct
14	Correct	9 ms	9600 KB	Output is correct
15	Correct	122 ms	55800 KB	Output is correct
16	Correct	14 ms	4096 KB	Output is correct
17	Correct	33 ms	14200 KB	Output is correct
18	Correct	39 ms	19040 KB	Output is correct
19	Correct	148 ms	70264 KB	Output is correct
20	Correct	115 ms	49400 KB	Output is correct
21	Correct	78 ms	33540 KB	Output is correct
22	Correct	77 ms	35064 KB	Output is correct
23	Correct	55 ms	36472 KB	Output is correct
24	Correct	195 ms	72544 KB	Output is correct
25	Correct	144 ms	62584 KB	Output is correct
26	Correct	160 ms	68088 KB	Output is correct
27	Correct	176 ms	70504 KB	Output is correct