Submission #1121831

#	Time	Username	Problem	Language	Result	Execution time	Memory
1121831		coolboy19521	Calvinball championship (CEOI15_teams)	C++17	70 / 100	90 ms	65536 KiB

teams

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

using ll = long long;

#define int ll

const int md = 1e6+7;
const int mxN = 10030;

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

main() {
    cin >> N;

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

    for (int i = 1; i <= N + 1; i ++) {
        dp[N + 1][i] = 1;
    }

    for (int i = N; 1 <= i; i --) {
        for (int j = i; 1 <= j; j --) {
            dp[i][j] = (dp[i][j] + dp[i + 1][j] * j % md) % md;
            dp[i][j] = (dp[i][j] + dp[i + 1][j + 1]) % md;
        }
    }

    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 --) {
            ans = (ans + dp[i + 1][max(mx, j)]) % md;
        }
    }

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

Compilation message (stderr)

teams.cpp:15:1: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
   15 | main() {
      | ^~~~

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