高效算法设计专项：UVa 11054

#include <iostream>
#include <cstdio>
#include <cstring>
#include <algorithm>
using namespace std;
typedef long long LL;
#define M 100010
LL a[M];
int n;
int main()
{
freopen("in.txt","r",stdin);
while(cin>>n&&n)
{
LL ans=0,res=0;
for(int i=0;i<n;i++)
{
cin>>a[i];
ans+=abs(res);
res+=a[i];
}
cout<<ans<<endl;
}
return 0;
}