Leecode加法题目3个 每日练习 Python实现（2）

class Solution:
   def addBinary(self, a: str, b: str) -> str:
       i,j=len(a)-1,len(b)-1
       add=0
       answer=''
       while i>=0 or j>=0:
           x=int(a[i]) if i>=0 else 0
           y=int(b[j]) if j>=0 else 0
           sum=x+y+add
           answer=str(sum%2)+answer
           add=sum//2
           i,j=i-1,j-1
       if add>0:answer=str(add)+answer
       return answer

class Solution:
   def addBinary(self, a: str, b: str) -> str:
       #bin(15)='0b1111'即把整数转化为二进制数
       #int('1111',2) int('A',16) 即把字符串转化成对应进制数
       return bin(int(a,2)+int(b,2))[2:]