제출 #1121793

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
1121793		vjudge1	Calvinball championship (CEOI15_teams)	C++17	0 / 100	1 ms	592 KiB

teams

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

#define int long long
#define ld double


const int INF = 1e18;
const int mod = 1e9 + 7;
const int sz = 5e5 + 5;

signed main()
{
   ios_base::sync_with_stdio(0);cin.tie(0);
   int n;
   cin >> n;
   vector < int > a(n + 1);
   int f = 0 , s = 0;
   for(int i = 1;i <= n;i++)
   {
      cin >> a[i];
      f += i;
      s += (i * a[i]) % mod;
   }
   cout << (s - f + 1 - n + 1) % mod << endl;
}

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• Subtask 3: 0 / 10
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• Subtask 10: 0 / 10