标签：des c style class blog code
Speed Limit
| Time Limit: 1000MS |
|
Memory Limit: 30000K |
| Total Submissions: 16884 |
|
Accepted: 11841 |
Description
Bill and Ted are taking a road trip. But the
odometer in their car is broken, so they don‘t know how many miles they have
driven. Fortunately, Bill has a working stopwatch, so they can record their
speed and the total time they have driven. Unfortunately, their record keeping
strategy is a little odd, so they need help computing the total distance driven.
You are to write a program to do this computation.
For example, if their
log shows
| Speed in miles perhour |
Total elapsed time in hours |
| 20 |
2 |
| 30 |
6 |
| 10 |
7 |
this means they drove 2 hours at
20 miles per hour, then 6-2=4 hours at 30 miles per hour, then 7-6=1 hour at 10
miles per hour. The distance driven is then (2)(20) + (4)(30) + (1)(10) = 40 +
120 + 10 = 170 miles. Note that the total elapsed time is always since the
beginning of the trip, not since the previous entry in their log.
Input
The input consists of one or more data sets. Each
set starts with a line containing an integer n, 1 <= n <= 10, followed
by n pairs of values, one pair per line. The first value in a pair, s, is the
speed in miles per hour and the second value, t, is the total elapsed time. Both
s and t are integers, 1 <= s <= 90 and 1 <= t <= 12. The values
for t are always in strictly increasing order. A value of -1 for n signals the
end of the input.
Output
For each input set, print the distance driven,
followed by a space, followed by the word "miles"
Sample Input
3
20 2
30 6
10 7
2
60 1
30 5
4
15 1
25 2
30 3
10 5
-1
Sample Output
170 miles
180 miles
90 miles
Source
Mid-Central USA 2004
水，简单模拟，没什么好说的
1 #include <iostream>
2 #include<cstdio>
3 using namespace std;
4
5 int main()
6 {
7 int n;
8 while(cin>>n)
9 {
10 if(n==-1)
11 break;
12 int sum = 0,time,speed,oldtime=0;
13 for(int i =0 ;i< n;i++)
14 {
15 scanf("%d%d",&speed,&time);
16 sum += (time-oldtime)*speed;
17 oldtime = time ;
18 }
19 cout<<sum<<" miles"<<endl;
20 }
21 }
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标签：des c style class blog code
原文地址：http://www.cnblogs.com/jhldreams/p/3761351.html
