답안 #914337

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
914337	2024-01-21T16:56:17 Z	borisAngelov	Tents (JOI18_tents)	C++17	100 / 100	191 ms	79348 KB

tents

#include <bits/stdc++.h>

using namespace std;

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

int n, m;

bool bl[maxn][maxn];
long long dp[maxn][maxn];

long long f(int rows, int cols)
{
    if (rows < 0 || cols < 0)
    {
        return 0;
    }

    if (rows == 0 || cols == 0)
    {
        return 1;
    }

    if (bl[rows][cols] == true)
    {
        return dp[rows][cols];
    }

    bl[rows][cols] = true;

    long long ans = 0;

    ans += f(rows - 1, cols);
    ans %= mod;

    ans += (4LL * cols) * f(rows - 1, cols - 1);
    ans %= mod;

    ans += ((1LL * cols) * (1LL * cols - 1LL) / 2LL) * f(rows - 1, cols - 2);
    ans %= mod;

    ans += (1LL * cols) * (1LL * (rows - 1)) * f(rows - 2, cols - 1);
    ans %= mod;

    return dp[rows][cols] = ans;
}

void fastIO()
{
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);
}

int main()
{
    fastIO();

    cin >> n >> m;

    cout << f(n, m) - 1 << endl;

    return 0;
}

Subtask #1

48.0 / 48.0

#	결과	실행 시간	메모리	Grader output
1	Correct	1 ms	344 KB	Output is correct
2	Correct	1 ms	348 KB	Output is correct
3	Correct	1 ms	2652 KB	Output is correct
4	Correct	2 ms	7260 KB	Output is correct
5	Correct	1 ms	2652 KB	Output is correct
6	Correct	2 ms	7256 KB	Output is correct
7	Correct	1 ms	2652 KB	Output is correct
8	Correct	2 ms	7260 KB	Output is correct
9	Correct	1 ms	4956 KB	Output is correct
10	Correct	3 ms	9564 KB	Output is correct
11	Correct	1 ms	2396 KB	Output is correct
12	Correct	3 ms	9564 KB	Output is correct

Subtask #2

52.0 / 52.0

#	결과	실행 시간	메모리	Grader output
1	Correct	1 ms	344 KB	Output is correct
2	Correct	1 ms	348 KB	Output is correct
3	Correct	1 ms	2652 KB	Output is correct
4	Correct	2 ms	7260 KB	Output is correct
5	Correct	1 ms	2652 KB	Output is correct
6	Correct	2 ms	7256 KB	Output is correct
7	Correct	1 ms	2652 KB	Output is correct
8	Correct	2 ms	7260 KB	Output is correct
9	Correct	1 ms	4956 KB	Output is correct
10	Correct	3 ms	9564 KB	Output is correct
11	Correct	1 ms	2396 KB	Output is correct
12	Correct	3 ms	9564 KB	Output is correct
13	Correct	0 ms	348 KB	Output is correct
14	Correct	12 ms	63032 KB	Output is correct
15	Correct	121 ms	74576 KB	Output is correct
16	Correct	3 ms	7512 KB	Output is correct
17	Correct	14 ms	19036 KB	Output is correct
18	Correct	32 ms	32728 KB	Output is correct
19	Correct	151 ms	78932 KB	Output is correct
20	Correct	108 ms	65372 KB	Output is correct
21	Correct	65 ms	44372 KB	Output is correct
22	Correct	77 ms	58196 KB	Output is correct
23	Correct	53 ms	79184 KB	Output is correct
24	Correct	191 ms	79348 KB	Output is correct
25	Correct	148 ms	69972 KB	Output is correct
26	Correct	161 ms	76768 KB	Output is correct
27	Correct	166 ms	79004 KB	Output is correct