题解 | #进制转换#

import sys

def trans16(x):
    # 先备份下十六进制各个字符的对应数字
    rtn={'0':0,'1':1,'2':2,'3':3,'4':4,'5':5,'6':6,'7':7,'8':8,'9':9,
        'A':10,'B':11,'C':12,'D':13,'E':14,'F':15}
    return rtn[x]

for line in sys.stdin:
    line=line.replace('\n','')#清除可能存在的换行符
    numList=list(line[2:])
    i=0
    size=len(numList)
    sum=0
    while(i<size):
        n=trans16(numList[i])
        for k in range(size-i-1):
            n*=16
        sum+=int(f"{n}")
        i+=1
    print(sum)