[BOJ/C++] 25206 너의 평점은

열심히 문제를 푸시는 여러분은 A+입니다.

#include <iostream>
#include <string>

using namespace std;

int main() {
	ios_base::sync_with_stdio(false);
	cin.tie(NULL);

	double n = 0;
	double ans = 0;

	for (int i = 0; i < 20; i++) {
		string name;
		double num;
		string score;
		cin >> name >> num >> score;

		
		if (score == "P")
			continue;
		else{ 
			n += num;
			if (score == "A+") 
				ans += num * 4.5;
			else if (score == "A0") 
				ans += num * 4.0;
			else if (score == "B+")
				ans += num * 3.5;
			else if (score == "B0")
				ans += num * 3.0;
			else if (score == "C+") 
				ans += num * 2.5;
			else if (score == "C0") 
				ans += num * 2.0;
			else if (score == "D+") 
				ans += num * 1.5;
			else if (score == "D0") 
				ans += num * 1.0;
		}
	}
	cout << ans / n;
	return 0;
}