LeetCode 67. Add Binary

Posted 2022-11-11 dacc123

题目

class Solution 
public:
    string addBinary(string a, string b) 
        
        string result="";
        int i=a.length()-1;
        int j=b.length()-1;
        int num=0;
        while(i>=0||j>=0||num>0)
        
            if(i>=0)
                num+=a[i--]-'0';
            if(j>=0)
                num+=b[j--]-'0';
            if(num==2)
            
                result+= '0';
                num=1;
            
            else if(num==3)
            
                result+='1';
                num=1;
            
            else 
            
                result+=num+'0';
                num=0;
            
        
        
        string ans="";
        for(int i=result.length()-1;i>=0;i--)
        
            ans+=result[i];
        
        
        return ans;
        
    
;