Ecological Premium - UVa10300

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题目描述

Problem A

Ecological Premium

Input: standard input

Output: standard output

Time Limit: 1 second

Memory Limit: 32 MB

German farmers are given a premium depending on the conditions at their farmyard. Imagine the following simplified regulation: you know the size of each farmer's farmyard in square meters and the number of animals living at it. We won't make a difference
between different animals, although this is far from reality. Moreover you have information about the degree the farmer uses environment-friendly equipment and practices, expressed in a single integer greater than zero. The amount of money a farmer receives
can be calculated from these parameters as follows. First you need the space a single animal occupies at an average. This value (in square meters) is then multiplied by the parameter that stands for the farmer's environment-friendliness, resulting in the premium
a farmer is paid per animal he owns. To compute the final premium of a farmer just multiply this premium per animal with the number of animals the farmer owns.

Input

The first line of input contains a single positive integer n (<20), the number of test cases. Each test case starts with a line containing a single integer f (0<f<20), the number of farmers in the test case. This line is
followed by one line per farmer containing three positive integers each: the size of the farmyard in square meters, the number of animals he owns and the integer value that expresses the farmer’s environment-friendliness. Input is terminated by end of file.
No integer in the input is greater than 100000 or less than 0.

Output

For each test case output one line containing a single integer that holds the summed burden for Germany's budget, which will always be a whole number. Do not output any blank lines.

Sample Input

3

5

1 1 1

2 2 2

3 3 3

2 3 4

8 9 2

3

9 1 8

6 12 1

8 1 1

3

10 30 40

9 8 5

100 1000 70

Sample Output

38

86

7445

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(The Joint Effort Contest, Problem setter: Frank Hutter)

解题思路

已知农场的面积和动物的数目。

此外还知道农场主使用设备的环境友好等级。

农场主得到的奖金可以由上面三个参数计算得出。

首先获得每只动物平均占用的面积。

然后这个值乘以环境友好度参数，得到的是一只动物得到的奖金。

最后把上面的值乘以动物的数目，就可以得到农场主获得的奖金。



奖金 = 农场的面积 / 动物的数目 * 环境友好等级 * 动物的数目 = 农场的面积 *　环境友好等级 



No integer in the input is greater than 100000 or less than 0.

注意数值范围，需要用long long保存。

代码实现

#include <iostream>
using namespace std;
int main(void) {
	int n;
	cin >> n;
	while(n--) {
		int f;
		cin >> f;
		long long s = 0;
		while(f--) {
			long long a, b, c;
			cin >> a >> b >> c;
			s += a * c;
		}
		cout << s << endl;
	}
	return 0;
}

（全文完）