CodeForces 103A Testing Pants for Sadness

http://codeforces.com/problemset/problem/103/A

看懂题意就可以了

简单

#include<bits/stdc++.h>
using namespace std;
int main(){int n;while(cin>>n){long long a[111];for(int i=0;i<n;i++)cin>>a[i];long long ans=0;for(int i=0;i<n;i++){ans=ans+(i+1)*a[i]-i;}cout<<ans<<endl;}return 0;
}

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