leetcode 67. Add Binary （高精度加法）

Given two binary strings, return their sum (also a binary string).

For example,
a =

"11"

b =

"1"

Return

"100"

.

简单的二进制高精度加法。

class Solution {
public:
string addBinary(string a, string b) {
string ans="";
int c=0,i=a.length()-1,j=b.length()-1;
while(i>=0||j>=0||c>0)
{
c+= i>=0? a[i--]-'0':0;
c+= j>=0? b[j--]-'0':0;
ans=char(c%2+'0') + ans;
c/=2;
}
return ans;
}
};