Time Limit: 1000MS Memory Limit: 65536K Total Submissions: 3225 Accepted: 1401
Description
You have bought a car in order to drive from Waterloo to a big city. The odometer on their car is broken, so you cannot measure distance. But the speedometer and cruise control both work, so the car can maintain a constant speed which can be adjusted from time to time in response to speed limits, traffic jams, and border queues. You have a stopwatch and note the elapsed time every time the speed changes. From time to time you wonder, “how far have I come?”. To solve this problem you must write a program to run on your laptop computer in the passenger seat
Input
Standard input contains several lines of input: Each speed change is indicated by a line specifying the elapsed time since the beginning of the trip (hh:mm:ss), followed by the new speed in km/h. Each query is indicated by a line containing the elapsed time. At the outset of the trip the car is stationary. Elapsed times are given in nondecreasing order and there is at most one speed change at any given time.
Output
For each query in standard input, you should print a line giving the time and the distance travelled, in the format below.
Sample Input
00:00:01 10000:15:0100:30:0101:00:01 5003:00:0103:00:05 140
Sample Output
00:15:01 25.00 km00:30:01 50.00 km03:00:01 200.00 km
题意：输入时间，如果没有输入速度的话则输出行走的距离，如果输入时间和速度的话则不输出距离只设定速度
代码如下
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