HDU - 4802 GPA

时间：2014-10-20 23:21:09 阅读：645 评论：0 收藏：0 [点我收藏+]

Description

In college, a student may take several courses. for each course i, he earns a certain credit (c _i), and a mark ranging from A to F, which is comparable to a score (s _i), according to the following conversion table
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The GPA is the weighted average score of all courses one student may take, if we treat the credit as the weight. In other words,
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An additional treatment is taken for special cases. Some courses are based on “Pass/Not pass” policy, where stude nts earn a mark “P” for “Pass” and a mark “N” for “Not pass”. Such courses are not supposed to be considered in computation. These special courses must be ignored for computing the correct GPA.
Specially, if a student’s credit in GPA computation is 0, his/her GPA will be “0.00”.

Input

There are several test cases, please process till EOF.
Each test case starts with a line containing one integer N (1 <= N <= 1000), the number of courses. Then follows N lines, each consisting the credit and the mark of one course. Credit is a positive integer and less than 10.

Output

For each test case, print the GPA (rounded to two decimal places) as the answer.

Sample Input

 5
2 B
3 D-
2 P
1 F
3 A
2
2 P
2 N
6
4 A
3 A
3 A
4 A
3 A
3 A

Sample Output

 2.33
0.00
4.00

题意：比较水的题目

#include <iostream>
#include <cstdio>
#include <cstring>
#include <algorithm>
#include <map>
using namespace std;

map<string, double> mp;
int n;

int main() {
	int m;
	string str;
	mp["A"] = 4.0, mp["A-"] = 3.7, mp["B+"] = 3.3;
	mp["B"] = 3.0, mp["B-"] = 2.7, mp["C+"] = 2.3;
	mp["C"] = 2.0, mp["C-"] = 1.7, mp["D"] = 1.3;
	mp["D-"] = 1.0, mp["F"] = 0.0;
	while (scanf("%d", &n) != EOF) {
		double ans = 0.00;
		int sum = 0;
		for (int i = 0; i < n; i++) {
			cin >> m >> str;
			if (str == "P" || str == "N")
				continue;
			sum += m;
			ans += (double) m * mp[str];
		}
		if (sum == 0)
			printf("0.00\n");
		else printf("%.2f\n", 1.0*ans/sum);
	}	
	return 0;
}

HDU - 4802 GPA

原文：http://blog.csdn.net/u011345136/article/details/40323775

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