Submission #1121750

#	Time	Username	Problem	Language	Result	Execution time	Memory
1121750		coolboy19521	Calvinball championship (CEOI15_teams)	C++17	0 / 100	18 ms	65536 KiB

teams

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

using ll = long long;

const int md = 1000000007;
const int mxN = 10004;

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

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

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

    dp[0][0] = 1;
    for (int i = 1; i <= N; i ++) {
        for (int j = 1; j <= i; j ++) {
            dp[i][j] = (dp[i - 1][j] * j % md + dp[i - 1][j - 1]) % md;
        }
    }

    int mx = 0;
    for (int i = 1; i <= N; i ++) {
        mx = max(mx, a[i]);
    }

    ll sm = 0;
    for (int i = 1; i <= mx; i ++) {
        sm = (sm + dp[N][i]) % md;
    }

    for (int i = N; 1 <= i; i --) {
        mx = 0;
        for (int j = 1; j <= i - 1; j ++) {
            mx = max(mx, a[j]);
        }
        if (a[i] < mx) {
            sm = (sm + md - dp[i - 1][mx] * (mx - a[i])) % md;
        }
    }

    cout << sm << endl;
}

Compilation message (stderr)

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

• Subtask 1: 0 / 10
• Subtask 2: 0 / 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