题解 | #进制转换#

#解法1,搞一个16进制数转换到10进制的表,逐位转换
#import sys

map_v = {'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}
while True:
    try:
        x_str = input()
        x_str = x_str[2:]
        value = 0
        for c in x_str:
            value = map_v[c] + value * 16 #每次循环相当于之前的左移,高位乘16

        print(value)
    except:
        #print(sys.exc_info())
        break


# #解法2
# while True:
#     try:
#         print(int(input(),16))
#     except:
#         break