HDU - 4802 GPA

标签：des   style   blog   http   color   io   os   ar   for   

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 

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”.

 

 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 

 2.33
0.00
4.00 

#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

标签：des   style   blog   http   color   io   os   ar   for   

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