Time Limit:1000MS Memory Limit:30000KB 64bit IO Format:%I64d & %I64u
Description
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
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
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
#include<iostream>
using namespace std;
int main( )
{
int n;
int a,b,s,k;
while(cin>>n&&n>0)
{
s=0,k=0;
while(n--)
{
cin>>a>>b;
s=s+a*(b-k);
k=b; }
cout<<s<<" miles"<<endl;
}
return 0;
}
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