poj_2017 水题

code：

<span style="font-size:18px;">#include <iostream>#include <fstream>using namespace std;int speed[11];int hour[11];int main(){fstream in("input.txt");int n;while (cin >> n&&n != -1){int sum = 0;speed[0] = 0;hour[0] = 0;for (int i = 1; i <= n; i++){cin >> speed[i] >> hour[i];}for (int i = 1; i <= n; i++){sum += (speed[i]*(hour[i] - hour[i - 1]));}cout << sum << " miles" << endl;}//system("pause");return 0;}</span>