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Submission #1021211

# Submission time Handle Problem Language Result Execution time Memory
1021211 2024-07-12T15:39:45 Z aufan Tents (JOI18_tents) C++17
100 / 100
 161 ms 71052 KB 
#include <bits/stdc++.h>
#define int long long
#define fi first
#define se second

using namespace std;

const int mod = 1e9 + 7;

int32_t main()
{
        ios_base::sync_with_stdio(false);
        cin.tie(NULL);
        
        int n, m;
        cin >> n >> m;

        vector<vector<int>> dp(n + 1, vector<int>(m + 1));
        for (int i = 0; i <= n; i++) dp[i][0] = 1;
        for (int i = 0; i <= m; i++) dp[0][i] = 1;
        for (int i = 1; i <= n; i++) {
                for (int j = 1; j <= m; j++) {
                        dp[i][j] += dp[i - 1][j - 1] * j % mod * 4 % mod;
                        dp[i][j] %= mod;

                        if (i - 2 >= 0) {
                                dp[i][j] += dp[i - 2][j - 1] * (i - 1) % mod * j % mod;
                                dp[i][j] %= mod;
                        }

                        if (j - 2 >= 0) {
                                dp[i][j] += dp[i - 1][j - 2] * (j * (j - 1) / 2 % mod) % mod;
                                dp[i][j] %= mod;
                        }

                        dp[i][j] += dp[i - 1][j];
                        dp[i][j] %= mod;
                }
        }

        dp[n][m] -= 1;
        dp[n][m] += mod;
        dp[n][m] %= mod;

        cout << dp[n][m] << '\n';
        
        return 0;
}

Subtask #1
48.0 / 48.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 344 KB Output is correct
2 Correct 0 ms 348 KB Output is correct
3 Correct 0 ms 412 KB Output is correct
4 Correct 0 ms 348 KB Output is correct
5 Correct 0 ms 348 KB Output is correct
6 Correct 1 ms 604 KB Output is correct
7 Correct 1 ms 604 KB Output is correct
8 Correct 0 ms 348 KB Output is correct
9 Correct 0 ms 460 KB Output is correct
10 Correct 1 ms 604 KB Output is correct
11 Correct 0 ms 348 KB Output is correct
12 Correct 2 ms 1116 KB Output is correct

Subtask #2
52.0 / 52.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 344 KB Output is correct
2 Correct 0 ms 348 KB Output is correct
3 Correct 0 ms 412 KB Output is correct
4 Correct 0 ms 348 KB Output is correct
5 Correct 0 ms 348 KB Output is correct
6 Correct 1 ms 604 KB Output is correct
7 Correct 1 ms 604 KB Output is correct
8 Correct 0 ms 348 KB Output is correct
9 Correct 0 ms 460 KB Output is correct
10 Correct 1 ms 604 KB Output is correct
11 Correct 0 ms 348 KB Output is correct
12 Correct 2 ms 1116 KB Output is correct
13 Correct 0 ms 344 KB Output is correct
14 Correct 0 ms 348 KB Output is correct
15 Correct 98 ms 44184 KB Output is correct
16 Correct 7 ms 3164 KB Output is correct
17 Correct 22 ms 10180 KB Output is correct
18 Correct 27 ms 12636 KB Output is correct
19 Correct 117 ms 51548 KB Output is correct
20 Correct 91 ms 41324 KB Output is correct
21 Correct 61 ms 27228 KB Output is correct
22 Correct 60 ms 27008 KB Output is correct
23 Correct 33 ms 15196 KB Output is correct
24 Correct 158 ms 71052 KB Output is correct
25 Correct 116 ms 52796 KB Output is correct
26 Correct 134 ms 60500 KB Output is correct
27 Correct 161 ms 68180 KB Output is correct