Submission #157537

#	Submission time	Handle	Problem	Language	Result	Execution time	Memory
157537	2019-10-12T08:53:59 Z	combi1k1	Tents (JOI18_tents)	C++14	100 / 100	123 ms	35548 KB

tents

#include<bits/stdc++.h>

using namespace std;

const int   N   = 3e3 + 1;
const int   mod = 1e9 + 7;

void add(int &a,int b)  {
    a += b;
    if (a >= mod)
        a -= mod;
}
int mul(int a,int b)    {
    return  1ll * a * b % mod;
}

int f[N][N];

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

    int H;  cin >> H;
    int W;  cin >> W;

    for(int i = 0 ; i <  N ; ++i)
        f[i][0] = 1,
        f[0][i] = 1;

    for(int i = 1 ; i <= H ; ++i)
    for(int j = 1 ; j <= W ; ++j)   {
        int &res = f[i][j];
        add(res,f[i - 1][j]);
        add(res,mul(f[i - 1][j - 1],4 * j));
        if (i > 1)  add(res,mul(f[i - 2][j - 1],j * (i - 1)));
        if (j > 1)  add(res,mul(f[i - 1][j - 2],j * (j - 1) / 2));
    }

    cout << (f[H][W] + mod - 1) % mod;
}

Subtask #1

48.0 / 48.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	11 ms	12408 KB	Output is correct
2	Correct	11 ms	12408 KB	Output is correct
3	Correct	11 ms	12408 KB	Output is correct
4	Correct	11 ms	12408 KB	Output is correct
5	Correct	11 ms	12536 KB	Output is correct
6	Correct	12 ms	12536 KB	Output is correct
7	Correct	12 ms	12536 KB	Output is correct
8	Correct	12 ms	12408 KB	Output is correct
9	Correct	11 ms	12412 KB	Output is correct
10	Correct	12 ms	12536 KB	Output is correct
11	Correct	11 ms	12408 KB	Output is correct
12	Correct	13 ms	12764 KB	Output is correct

Subtask #2

52.0 / 52.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	11 ms	12408 KB	Output is correct
2	Correct	11 ms	12408 KB	Output is correct
3	Correct	11 ms	12408 KB	Output is correct
4	Correct	11 ms	12408 KB	Output is correct
5	Correct	11 ms	12536 KB	Output is correct
6	Correct	12 ms	12536 KB	Output is correct
7	Correct	12 ms	12536 KB	Output is correct
8	Correct	12 ms	12408 KB	Output is correct
9	Correct	11 ms	12412 KB	Output is correct
10	Correct	12 ms	12536 KB	Output is correct
11	Correct	11 ms	12408 KB	Output is correct
12	Correct	13 ms	12764 KB	Output is correct
13	Correct	11 ms	12408 KB	Output is correct
14	Correct	11 ms	12408 KB	Output is correct
15	Correct	89 ms	33736 KB	Output is correct
16	Correct	16 ms	13816 KB	Output is correct
17	Correct	29 ms	17272 KB	Output is correct
18	Correct	34 ms	18396 KB	Output is correct
19	Correct	99 ms	34940 KB	Output is correct
20	Correct	83 ms	31364 KB	Output is correct
21	Correct	59 ms	25180 KB	Output is correct
22	Correct	59 ms	25604 KB	Output is correct
23	Correct	38 ms	19736 KB	Output is correct
24	Correct	123 ms	35548 KB	Output is correct
25	Correct	97 ms	32376 KB	Output is correct
26	Correct	109 ms	34168 KB	Output is correct
27	Correct	119 ms	35064 KB	Output is correct