답안 #866559

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
866559	2023-10-26T11:47:01 Z	ArashJafariyan	Tents (JOI18_tents)	C++17	100 / 100	133 ms	36232 KB

tents

#include <bits/stdc++.h>
using namespace std;

const int N = 3e3 + 4, MOD = 1e9 + 7;

int n, m, _dp[N][N];

int dp(int i, int j) {
    if (i < 0 || j < 0)
        return 0;
    else if (!i || !j)
        return 1;
    else
        return _dp[i][j];
}

int c(int k) {
    return k * (k - 1) / 2;
}

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

    for (int i = 1; i < N; ++i) {
        for (int j = 1; j < N; ++j) {
            _dp[i][j] = dp(i, j - 1);
            _dp[i][j] = (_dp[i][j] + 4ll * i * dp(i - 1, j - 1) % MOD) % MOD;
            _dp[i][j] = (_dp[i][j] + 1ll * c(i) * dp(i - 2, j - 1) % MOD) % MOD;
            _dp[i][j] = (_dp[i][j] + 1ll * i * (j - 1) * dp(i - 1, j - 2) % MOD) % MOD;
        }
    }

    cin >> n >> m;
    cout << (dp(n, m) + MOD - 1) % MOD;

    return 0;
}

Subtask #1

48.0 / 48.0

#	결과	실행 시간	메모리	Grader output
1	Correct	132 ms	35692 KB	Output is correct
2	Correct	130 ms	35672 KB	Output is correct
3	Correct	129 ms	35712 KB	Output is correct
4	Correct	130 ms	35664 KB	Output is correct
5	Correct	130 ms	35724 KB	Output is correct
6	Correct	130 ms	35668 KB	Output is correct
7	Correct	131 ms	35712 KB	Output is correct
8	Correct	130 ms	35664 KB	Output is correct
9	Correct	132 ms	35928 KB	Output is correct
10	Correct	130 ms	35668 KB	Output is correct
11	Correct	131 ms	35700 KB	Output is correct
12	Correct	130 ms	35700 KB	Output is correct

Subtask #2

52.0 / 52.0

#	결과	실행 시간	메모리	Grader output
1	Correct	132 ms	35692 KB	Output is correct
2	Correct	130 ms	35672 KB	Output is correct
3	Correct	129 ms	35712 KB	Output is correct
4	Correct	130 ms	35664 KB	Output is correct
5	Correct	130 ms	35724 KB	Output is correct
6	Correct	130 ms	35668 KB	Output is correct
7	Correct	131 ms	35712 KB	Output is correct
8	Correct	130 ms	35664 KB	Output is correct
9	Correct	132 ms	35928 KB	Output is correct
10	Correct	130 ms	35668 KB	Output is correct
11	Correct	131 ms	35700 KB	Output is correct
12	Correct	130 ms	35700 KB	Output is correct
13	Correct	132 ms	35664 KB	Output is correct
14	Correct	130 ms	35664 KB	Output is correct
15	Correct	130 ms	35668 KB	Output is correct
16	Correct	131 ms	36232 KB	Output is correct
17	Correct	130 ms	35668 KB	Output is correct
18	Correct	130 ms	35736 KB	Output is correct
19	Correct	130 ms	35704 KB	Output is correct
20	Correct	132 ms	36180 KB	Output is correct
21	Correct	133 ms	35668 KB	Output is correct
22	Correct	129 ms	35724 KB	Output is correct
23	Correct	130 ms	35712 KB	Output is correct
24	Correct	130 ms	35712 KB	Output is correct
25	Correct	130 ms	35668 KB	Output is correct
26	Correct	130 ms	35704 KB	Output is correct
27	Correct	130 ms	35948 KB	Output is correct