Kattis - Speed Limit
2017-01-13 20:36
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Speed Limit
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 per hour | Total elapsed time in hours |
20 | 2 |
30 | 6 |
10 | 7 |
Input
The input consists of one or more data sets. Each set starts with a line containing an integer nn, 1≤n≤101≤n≤10, followed by nn pairs of values, one pair per line. The first value in a pair, ss, is the speed in miles per hour and the second value, tt, is the total elapsed time. Both ss and tt are integers, 1≤s≤901≤s≤90 and 1≤t≤121≤t≤12. The values for ttare always in strictly increasing order. A value of −1−1 for nn 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 1 | Sample Output 1 |
---|---|
3 20 2 30 6 10 7 2 60 1 30 5 4 15 1 25 2 30 3 10 5 -1 |
题意
给出某一时刻的时速,求一共走了多少公里思路
注意时间要减掉前面的时间才能计算当前时速行走的距离代码
#include<bits/stdc++.h> using namespace std; int main() { int t; while(cin >> t && t != -1) { int a[100], b[100]; for(int i = 0; i < t; i++) { cin >> a[i] >> b[i]; } int sum = 0; for(int i = 0; i < t; i++) { sum += a[i] * (b[i] - b[i - 1]); } printf("%d miles\n", sum); } }
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