迴圈
輸入n
依題目計算花費
輸出
#include <iostream>
using namespace std;
int main()
{
unsigned long long int cost;
int n, number;
while(cin >> n)
{
cost = 0;
for(int i = 1; i<=n; i++)
{
cin >> number;
cost += number*i;
}
cout << cost << endl;
}
return 0;
}
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