(简单模拟2.1.1)POJ 2017 Speed Limit(跨项累加sumLen += (t2-t1)*v )

/* * POJ_2017.cpp * *  Created on: 2013年10月24日 *      Author: Administrator */#include <iostream>#include <cstdio>using namespace std;int main() {int n;while (scanf("%d", &n) != EOF, n != -1) {int t1 = 0, t2 = 0, v = 0;int sumLen = 0;int i;for (i = 0; i < n; ++i) {t1 = t2;scanf("%d%d", &v, &t2);sumLen += (t2 - t1) * v;}printf("%d miles\n",sumLen);}return 0;}