Submission #781101

#	Time	Username	Problem	Language	Result	Execution time	Memory
781101		Charizard2021	Calvinball championship (CEOI15_teams)	C++17	100 / 100	75 ms	632 KiB

teams

#include <bits/stdc++.h>
using namespace std;
const long long MOD = 1000007;
int main(){
    long long n;
    cin >> n;
    long long dp[2][1 + n];
    long long cur = n % 2;
    long long a[1 + n];
    long long prefMax[1 + n];
    prefMax[0] = 0;
    for(long long i = 1; i <= n; i++){
        cin >> a[i];
        prefMax[i] = max(prefMax[i - 1], a[i]);
        dp[cur][i] = 1;
    }
    long long ans = 1;
    for(long long i = n - 1; i > 0; i--, cur ^= 1){
        ans = (ans + dp[cur][prefMax[i]] * (a[i + 1] - 1)) % MOD;
        for(long long j = 1; j <= i; j++){
            dp[!cur][j] = (dp[cur][j] * j + dp[cur][j + 1]) % MOD;
        }
    }
    cout << ans << "\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