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
(The Joint Effort Contest, Problem setter: Frank Hutter)
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。
#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）
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原文：http://blog.csdn.net/milkcu/article/details/23529935