Submission #899420

# Submission time Handle Problem Language Result Execution time Memory
899420 2024-01-06T06:43:15 Z MongHwa Tents (JOI18_tents) C++17
100 / 100
146 ms 71384 KB
#include <iostream>
#include <cstring>
using namespace std;

#define ll long long
#define MOD 1000000007

ll dp[3005][3005];

ll go(int x, int y)
{
	if(x == 0 || y == 0)
		return 1;
	
	ll& ret = dp[x][y];
	if(ret != -1)
		return ret;

	ret = 0;
	ret += go(x-1, y);
	ret %= MOD;

	if(y > 0)
		ret += 4*y*go(x-1, y-1) % MOD;
	ret %= MOD;

	if(x > 1 && y > 0)
		ret += (x-1)*y*go(x-2, y-1) % MOD;
	ret %= MOD;

	if(y > 1)
		ret += (y*(y-1))/2 % MOD * go(x-1, y-2);
	ret %= MOD;

	return ret;
}

int main()
{
	ios::sync_with_stdio(0);
	cin.tie(0);

	memset(dp, -1, sizeof(dp));

	int h, w;
	cin >> h >> w;

	cout << (go(h, w) - 1 + MOD) % MOD << '\n';
}
# Verdict Execution time Memory Grader output
1 Correct 16 ms 71256 KB Output is correct
2 Correct 9 ms 71004 KB Output is correct
3 Correct 9 ms 71004 KB Output is correct
4 Correct 9 ms 71068 KB Output is correct
5 Correct 10 ms 70900 KB Output is correct
6 Correct 9 ms 71004 KB Output is correct
7 Correct 9 ms 71004 KB Output is correct
8 Correct 9 ms 71004 KB Output is correct
9 Correct 9 ms 71004 KB Output is correct
10 Correct 10 ms 71076 KB Output is correct
11 Correct 10 ms 71004 KB Output is correct
12 Correct 11 ms 71088 KB Output is correct
# Verdict Execution time Memory Grader output
1 Correct 16 ms 71256 KB Output is correct
2 Correct 9 ms 71004 KB Output is correct
3 Correct 9 ms 71004 KB Output is correct
4 Correct 9 ms 71068 KB Output is correct
5 Correct 10 ms 70900 KB Output is correct
6 Correct 9 ms 71004 KB Output is correct
7 Correct 9 ms 71004 KB Output is correct
8 Correct 9 ms 71004 KB Output is correct
9 Correct 9 ms 71004 KB Output is correct
10 Correct 10 ms 71076 KB Output is correct
11 Correct 10 ms 71004 KB Output is correct
12 Correct 11 ms 71088 KB Output is correct
13 Correct 9 ms 71004 KB Output is correct
14 Correct 9 ms 71260 KB Output is correct
15 Correct 105 ms 71372 KB Output is correct
16 Correct 10 ms 71004 KB Output is correct
17 Correct 19 ms 71212 KB Output is correct
18 Correct 30 ms 71004 KB Output is correct
19 Correct 118 ms 71384 KB Output is correct
20 Correct 92 ms 71256 KB Output is correct
21 Correct 58 ms 71132 KB Output is correct
22 Correct 64 ms 71256 KB Output is correct
23 Correct 42 ms 71260 KB Output is correct
24 Correct 146 ms 71256 KB Output is correct
25 Correct 125 ms 71260 KB Output is correct
26 Correct 126 ms 71256 KB Output is correct
27 Correct 139 ms 71260 KB Output is correct