您的位置:首页 > 其它

2018_1_21_Speed Limit_水题

2018-01-21 08:31 295 查看
Speed Limit

Time Limit: 1000MS Memory Limit: 30000K
Total Submissions: 21088 Accepted: 14499
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 perhourTotal elapsed time in hours
202
306
107
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
#include<iostream>
#include<string>
#include<vector>
#include<algorithm>
#include<cmath>
using namespace std;

struct AA{
    int a,b;
}a[13];

int main(){
    int n;
    while(scanf("%d",&n)){
        if(n==-1)return 0;
        int sum=0;
        for(int i=1;i<=n;i++)
        scanf("%d%d",&a[i].a,&a[i].b);
        for(int i=1;i<=n;i++)
        sum+=(a[i].b-a[i-1].b)*a[i].a;
        printf("%d miles\n",sum);
    }
    return 0;
}
内容来自用户分享和网络整理,不保证内容的准确性,如有侵权内容,可联系管理员处理 点击这里给我发消息
标签: