Submission #1121809

#	Time	Username	Problem	Language	Result	Execution time	Memory
1121809		coolboy19521	Calvinball championship (CEOI15_teams)	C++17	70 / 100	171 ms	65536 KiB

teams

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

using ll = long long;

const int md = 1e6+7;
const int mxN = 10003;

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

ll go(int i, int j) {
    ll& val = dp[i][j];
    if (N < i) {
        return val = 1;
    }
    if (val) {
        return val;
    } else {
        val = (val + go(i + 1, j) * j % md) % md;
        val = (val + go(i + 1, j + 1)) % md;
        return val;
    }
}

main() {
    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 --) {
            ans = (ans + go(i + 1, max(mx, j))) % md;
        }
    }

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

Compilation message (stderr)

teams.cpp:27:1: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
   27 | 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