oj.uz

Submission #209794

# Submission time Handle Problem Language Result Execution time Memory
209794 2020-03-15T14:28:59 Z FutymyClone Zapina (COCI20_zapina) C++14
110 / 110
 164 ms 1808 KB 
#include <bits/stdc++.h>

using namespace std;

const int N = 355;
const int mod = 1e9 + 7;

int n, f[N][N], g[N][N], C[N][N];

void add (int &x, int y) {
    x += y;
    if (x >= mod) x -= mod;
}

int main(){
    scanf("%d", &n);
    for (int i = 0; i <= n; i++) {
        for (int j = 0; j <= i; j++) {
            if (!i || !j || i == j) C[i][j] = 1;
            else C[i][j] = (C[i - 1][j] + C[i - 1][j - 1]) % mod;
        }
    }

    f[0][0] = 1;
    for (int i = 0; i < n; i++) {
        for (int j = 0; j <= n; j++) {
            for (int k = 0; j + k <= n; k++) {
                add(f[i + 1][j + k], 1LL * f[i][j] * C[n - j][k] % mod);
            }
        }
    }

    g[0][0] = 1;
    for (int i = 0; i < n; i++) {
        for (int j = 0; j <= n; j++) {
            for (int k = 0; j + k <= n; k++) {
                if (k == i + 1) continue;
                add(g[i + 1][j + k], 1LL * g[i][j] * C[n - j][k] % mod);
            }
        }
    }

    int ans = f[n][n] - g[n][n];
    if (ans < 0) ans += mod;
    printf("%d", ans);
    return 0;
}

Compilation message

zapina.cpp: In function 'int main()':
zapina.cpp:16:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d", &n);
     ~~~~~^~~~~~~~~~

Subtask #1
22.0 / 22.0

# Verdict Execution time Memory Grader output
1 Correct 5 ms 376 KB Output is correct
2 Correct 5 ms 376 KB Output is correct
3 Correct 5 ms 376 KB Output is correct
4 Correct 4 ms 376 KB Output is correct
5 Correct 5 ms 376 KB Output is correct

Subtask #2
33.0 / 33.0

# Verdict Execution time Memory Grader output
1 Correct 5 ms 376 KB Output is correct
2 Correct 5 ms 376 KB Output is correct
3 Correct 5 ms 376 KB Output is correct
4 Correct 4 ms 376 KB Output is correct
5 Correct 5 ms 376 KB Output is correct
6 Correct 5 ms 376 KB Output is correct
7 Correct 5 ms 376 KB Output is correct
8 Correct 5 ms 376 KB Output is correct
9 Correct 5 ms 376 KB Output is correct
10 Correct 5 ms 376 KB Output is correct
11 Correct 5 ms 376 KB Output is correct
12 Correct 5 ms 376 KB Output is correct
13 Correct 5 ms 376 KB Output is correct
14 Correct 5 ms 376 KB Output is correct
15 Correct 5 ms 376 KB Output is correct
16 Correct 5 ms 376 KB Output is correct

Subtask #3
55.0 / 55.0

# Verdict Execution time Memory Grader output
1 Correct 5 ms 376 KB Output is correct
2 Correct 5 ms 376 KB Output is correct
3 Correct 5 ms 376 KB Output is correct
4 Correct 4 ms 376 KB Output is correct
5 Correct 5 ms 376 KB Output is correct
6 Correct 5 ms 376 KB Output is correct
7 Correct 5 ms 376 KB Output is correct
8 Correct 5 ms 376 KB Output is correct
9 Correct 5 ms 376 KB Output is correct
10 Correct 5 ms 376 KB Output is correct
11 Correct 5 ms 376 KB Output is correct
12 Correct 5 ms 376 KB Output is correct
13 Correct 5 ms 376 KB Output is correct
14 Correct 5 ms 376 KB Output is correct
15 Correct 5 ms 376 KB Output is correct
16 Correct 5 ms 376 KB Output is correct
17 Correct 75 ms 1484 KB Output is correct
18 Correct 5 ms 504 KB Output is correct
19 Correct 20 ms 1016 KB Output is correct
20 Correct 5 ms 376 KB Output is correct
21 Correct 100 ms 1528 KB Output is correct
22 Correct 16 ms 888 KB Output is correct
23 Correct 6 ms 632 KB Output is correct
24 Correct 24 ms 1016 KB Output is correct
25 Correct 18 ms 1016 KB Output is correct
26 Correct 32 ms 1144 KB Output is correct
27 Correct 143 ms 1784 KB Output is correct
28 Correct 139 ms 1784 KB Output is correct
29 Correct 147 ms 1784 KB Output is correct
30 Correct 139 ms 1784 KB Output is correct
31 Correct 140 ms 1784 KB Output is correct
32 Correct 140 ms 1784 KB Output is correct
33 Correct 151 ms 1800 KB Output is correct
34 Correct 143 ms 1808 KB Output is correct
35 Correct 164 ms 1780 KB Output is correct
36 Correct 146 ms 1784 KB Output is correct
37 Correct 147 ms 1784 KB Output is correct