Submission #1121770

#	Time	Username	Problem	Language	Result	Execution time	Memory
1121770		coolboy19521	Calvinball championship (CEOI15_teams)	C++17	20 / 100	5 ms	592 KiB

teams

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

using ll = long long;

const int md = 1000000007;
const int mxN = 20;

ll dp[mxN][mxN];
int a[mxN];

main() {
    int N;
    cin >> N;

    for (int i = 1; i <= N; i ++) {
        cin >> a[i];
    }

    ll ans = 0;
    int mx = 0;
    for (int i = 1; i <= N; i ++) {
        mx = max(mx, a[i - 1]);
        for (int j = a[i] - 1; 1 <= j; j --) {
            memset(dp, 0, sizeof(dp));
            dp[i][max(mx, j)] = 1;
            for (int k = i + 1; k <= N; k ++) {
                for (int l = 1; l <= k; l ++) {
                    dp[k][l] = (dp[k - 1][l] * l % md + dp[k - 1][l - 1]) % md;
                }
            }
            ll sm = 0;
            for (int k = 1; k <= N; k ++) {
                sm = (sm + dp[N][k]) % md;
            }
            ans = (ans + sm) % md;
        }
    }

    cout << (ans + 1) % md << endl;
}

Compilation message (stderr)

teams.cpp:12:1: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
   12 | main() {
      | ^~~~

• Subtask 1: 10 / 10
• Subtask 2: 10 / 10
• Subtask 3: 0 / 10
• Subtask 4: 0 / 10
• Subtask 5: 0 / 10
• Subtask 6: 0 / 10
• Subtask 7: 0 / 10
• Subtask 8: 0 / 10
• Subtask 9: 0 / 10
• Subtask 10: 0 / 10