Submission #288148

#	Submission time	Handle	Problem	Language	Result	Execution time	Memory
288148	2020-09-01T09:11:30 Z	ngotienhung	Tents (JOI18_tents)	C++14	100 / 100	216 ms	70904 KB

tents

#include <bits/stdc++.h>
#define int long long
#define fi first
#define se second

using namespace std;

const int maxN = 3005;
const int mod = 1e9 + 7;

int n,m;
int f[maxN][maxN];

int32_t main()
{
	ios_base::sync_with_stdio(false); cin.tie(); cout.tie();

    cin >> m >> n;

    for(int i = 0; i <= m; ++i)
        f[i][0] = 1;
    for(int i = 0; i <= n; ++i)
        f[0][i] = 1;

    for(int i = 1; i <= m; ++i){
        for(int j = 1; j <= n; ++j){
            f[i][j] = (f[i][j] + f[i - 1][j]) % mod;
            f[i][j] = (f[i][j] + f[i - 1][j - 1] * 4 % mod * j % mod) % mod;
            if(j >= 2)
            f[i][j] = (f[i][j] + f[i - 1][j - 2] * (j*(j - 1)/2 % mod)) % mod;
            if(i >= 2)
            f[i][j] = (f[i][j] + f[i - 2][j - 1] * j % mod * (i - 1) % mod) % mod;
        }
    }

    cout << (f[m][n] - 1 + mod) % mod;
}

Subtask #1

48.0 / 48.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	1 ms	384 KB	Output is correct
2	Correct	0 ms	384 KB	Output is correct
3	Correct	1 ms	512 KB	Output is correct
4	Correct	1 ms	1152 KB	Output is correct
5	Correct	1 ms	768 KB	Output is correct
6	Correct	1 ms	1408 KB	Output is correct
7	Correct	1 ms	896 KB	Output is correct
8	Correct	1 ms	1536 KB	Output is correct
9	Correct	1 ms	896 KB	Output is correct
10	Correct	2 ms	1792 KB	Output is correct
11	Correct	1 ms	384 KB	Output is correct
12	Correct	3 ms	2304 KB	Output is correct

Subtask #2

52.0 / 52.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	1 ms	384 KB	Output is correct
2	Correct	0 ms	384 KB	Output is correct
3	Correct	1 ms	512 KB	Output is correct
4	Correct	1 ms	1152 KB	Output is correct
5	Correct	1 ms	768 KB	Output is correct
6	Correct	1 ms	1408 KB	Output is correct
7	Correct	1 ms	896 KB	Output is correct
8	Correct	1 ms	1536 KB	Output is correct
9	Correct	1 ms	896 KB	Output is correct
10	Correct	2 ms	1792 KB	Output is correct
11	Correct	1 ms	384 KB	Output is correct
12	Correct	3 ms	2304 KB	Output is correct
13	Correct	1 ms	384 KB	Output is correct
14	Correct	5 ms	9728 KB	Output is correct
15	Correct	139 ms	55228 KB	Output is correct
16	Correct	10 ms	4096 KB	Output is correct
17	Correct	31 ms	12920 KB	Output is correct
18	Correct	40 ms	17144 KB	Output is correct
19	Correct	165 ms	62980 KB	Output is correct
20	Correct	131 ms	50936 KB	Output is correct
21	Correct	86 ms	33788 KB	Output is correct
22	Correct	86 ms	35576 KB	Output is correct
23	Correct	51 ms	27128 KB	Output is correct
24	Correct	216 ms	70904 KB	Output is correct
25	Correct	174 ms	61304 KB	Output is correct
26	Correct	185 ms	66808 KB	Output is correct
27	Correct	204 ms	68984 KB	Output is correct