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Submission #866559

# Submission time Handle Problem Language Result Execution time Memory
866559 2023-10-26T11:47:01 Z ArashJafariyan Tents (JOI18_tents) C++17
100 / 100
 133 ms 36232 KB 
#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

# Verdict Execution time Memory 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

# Verdict Execution time Memory 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