67. Add Binary

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

For example,
a = "11"
b = "1"
Return "100".

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分析：二进制下的字符串的加法

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