Submission #68610

#	Time	Username	Problem	Language	Result	Execution time	Memory
68610		Googal	Calvinball championship (CEOI15_teams)	C++14	100 / 100	165 ms	1244 KiB

teams

#include <bits/stdc++.h>
using namespace std;
 
const int N = 1e4 + 1;
const int M = 1e6 + 7;
 
int n, r, a[N], m[N], d[2][N];
 
int main() {
    ios::sync_with_stdio(false);
    cin >> n;
    for(int i = 1; i <= n; i++){
        cin >> a[i];
        m[i] = max(m[i - 1], a[i]);
    }
    fill(d[0], d[0] + N, 1);
    r = a[n];
    for(int i = n - 1, p = 1; i >= 1; i--, p ^= 1){
        for(int j = 1; j <= i; j++)
            d[p][j] = (d[!p][j + 1] + 1LL * j * d[!p][j]) % M;  
        r = (r + 1LL * (a[i] - 1) * d[p][m[i - 1]]) % M;
    }
    cout << r % M << '\n';
}

• 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: 10 / 10
• Subtask 9: 10 / 10
• Subtask 10: 10 / 10