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Submission #887952

# Submission time Handle Problem Language Result Execution time Memory
887952 2023-12-15T15:25:07 Z boris_mihov Tents (JOI18_tents) C++17
100 / 100
 181 ms 78932 KB 
#include <algorithm>
#include <iostream>
#include <numeric>
#include <cassert>
#include <vector>

typedef long long llong;
const int MAXN = 3000 + 10;
const int MOD = 1e9 + 7;

llong dp[MAXN][MAXN];
bool bl[MAXN][MAXN];

llong rec(int n, int m)
{
    if (n < 0 || m < 0)
    {
        return 0;
    }

    if (n == 0 || m == 0)
    {
        return 1;
    }

    if (bl[n][m])
    {
        return dp[n][m];
    }

    bl[n][m] = true;
    dp[n][m] = rec(n - 1, m);
    dp[n][m] += 4 * rec(n - 1, m - 1) * m;
    dp[n][m] += rec(n - 1, m - 2) * m * (m - 1) / 2;
    dp[n][m] += rec(n - 2, m - 1) * m * (n - 1);
    dp[n][m] %= MOD;
    return dp[n][m];
}

int n, m;
int main()
{
    std::cin >> n >> m;
    std::cout << rec(n, m) - 1 << '\n';
    return 0;

}

Subtask #1
48.0 / 48.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 2392 KB Output is correct
2 Correct 1 ms 2396 KB Output is correct
3 Correct 0 ms 2396 KB Output is correct
4 Correct 1 ms 7004 KB Output is correct
5 Correct 1 ms 2652 KB Output is correct
6 Correct 1 ms 7260 KB Output is correct
7 Correct 1 ms 4700 KB Output is correct
8 Correct 3 ms 9308 KB Output is correct
9 Correct 1 ms 4908 KB Output is correct
10 Correct 2 ms 9308 KB Output is correct
11 Correct 1 ms 2392 KB Output is correct
12 Correct 3 ms 9308 KB Output is correct

Subtask #2
52.0 / 52.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 2392 KB Output is correct
2 Correct 1 ms 2396 KB Output is correct
3 Correct 0 ms 2396 KB Output is correct
4 Correct 1 ms 7004 KB Output is correct
5 Correct 1 ms 2652 KB Output is correct
6 Correct 1 ms 7260 KB Output is correct
7 Correct 1 ms 4700 KB Output is correct
8 Correct 3 ms 9308 KB Output is correct
9 Correct 1 ms 4908 KB Output is correct
10 Correct 2 ms 9308 KB Output is correct
11 Correct 1 ms 2392 KB Output is correct
12 Correct 3 ms 9308 KB Output is correct
13 Correct 1 ms 2396 KB Output is correct
14 Correct 9 ms 62556 KB Output is correct
15 Correct 114 ms 74368 KB Output is correct
16 Correct 2 ms 7260 KB Output is correct
17 Correct 16 ms 20988 KB Output is correct
18 Correct 28 ms 32648 KB Output is correct
19 Correct 133 ms 78168 KB Output is correct
20 Correct 115 ms 67524 KB Output is correct
21 Correct 63 ms 46428 KB Output is correct
22 Correct 69 ms 60296 KB Output is correct
23 Correct 45 ms 77904 KB Output is correct
24 Correct 181 ms 78932 KB Output is correct
25 Correct 138 ms 69712 KB Output is correct
26 Correct 153 ms 76652 KB Output is correct
27 Correct 177 ms 78484 KB Output is correct