题解 | 牛牛的绩点
牛牛的绩点
https://www.nowcoder.com/practice/de8bc3e736164786b07a4dd64ed172f7
from sys import stdin
read1 = stdin.read().split()
s = 0
n = 0
dict1 = {"A":4,"B":3,"C":2,"D":1,"F":0}
for i in range(len(read1)//2):
s += dict1[read1[2*i]]*int(read1[2*i+1])
n += int(read1[2*i+1])
print(f"{s/n:.2f}")
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