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4802：GPA

题目描述
In college, a student may take several courses. for each course i, he earns a certain credit (ci), and a mark ranging from A to F, which is comparable to a score (si), according to the following conversion table

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,

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”.
输入解释
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.
输出解释
For each test case, print the GPA (rounded to two decimal places) as the answer.
输入样例 
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
输出样例 
2.33
0.00
4.00
提示
For the first test case:
GPA =(3.0 * 2 + 1.0 * 3 + 0.0 * 1 + 4.0 * 3)/(2 + 3 + 1 + 3) = 2.33

For the second test case: because credit in GPA computation is 0(P/N in additional treatment), so his/her GPA is “0.00”.
来自杭电HDUOJ的附加信息
Recommend liuyiding
该题目是Virtual Judge题目，来自 杭电HDUOJ
题目来源 2013ACM/ICPC亚洲区南京站现场赛——题目重现
源链接： HDU-4802
最后修改于 2020-10-25T23:17:00+00:00 由爬虫自动更新
共提交 0 次
通过率 --%
时间上限 内存上限
2000/1000MS(Java/Others) 32768/32768K(Java/Others)