UVa 11054 Wine trading in Gergovia——思路题

注意用long long

#include <cstdio>#include <cstring>#include <iostream>#include <algorithm>#include <cmath>using namespace std;typedef long long ll;int main(){    int n;    while (cin >> n && n) {        ll a = 0, b = 0, ans = 0;//a表示送往下一个村庄的酒        for (int i = 0; i < n; i++) {            cin >> b;            b += a;            ans += abs(a);            a = b;        }        cout << ans << endl;    }    return 0;}