Wine Trading in Gergovia

#include <iostream>#include <cstdio>#include <cstdlib>#include <cmath>#include <queue>#include <algorithm>#include <vector>#include <cstring>#include <stack>#include <cctype>#include <utility>   #include <map>#include <string>  #include <climits> #include <set>#include <string> #include <sstream>#include <utility>#include <ctime>using std::priority_queue;using std::vector;using std::swap;using std::stack;using std::sort;using std::max;using std::min;using std::pair;using std::map;using std::string;using std::cin;using std::cout;using std::set;using std::queue;using std::string;using std::istringstream;using std::make_pair;using std::greater;int main(){int n;while(scanf("%d", &n), n){int temp, rest = 0;long long ans = 0LL;for(int i = 1; i <= n; ++i){scanf("%d", &temp);ans += abs(rest);rest += temp;}printf("%I64d\n", ans);}return 0;}