제출 #1121797

#제출 시각아이디문제언어결과실행 시간메모리
1121797vjudge1Calvinball championship (CEOI15_teams)C++17
10 / 100
2 ms508 KiB
#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 sum = 0;
   for(int i = n;i >= 1;i--)
   {
      cin >> a[i];
      sum += (i * a[i]);
   }
   cout << sum - ((n * (n + 1)) / 2) + 1 << endl;
}
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