[等价转换]UVa11054 - Wine trading in Gergovia

第二个村庄的需求为a1+a2

#include<bits/stdc++.h>using namespace std;int main(){    int n;    while(cin>>n&&n)    {        long long ans=0,a,last=0;        for(int i=0; i<n; i++)        {            cin>>a;            ans+=abs(last);            last+=a;        }        cout<<ans<<endl;    }    return 0;}