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Add Binary.cpp
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Add Binary.cpp
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class Solution {
public:
string addBinary(string a, string b) {
int lena = a.length();
int lenb = b.length();
int len = lena>lenb?lena:lenb;
string result(len+1, '0');
lena--;
lenb--;
while(lena>=0||lenb>=0){
char cha,chb;
if(lena<0){
cha='0';
chb=b[lenb];
}else if(lenb<0){
cha=a[lena];
chb='0';
}else {
cha = a[lena];
chb = b[lenb];
}
result[len]+=(cha-'0'+chb-'0');
if(result[len]>'1'){
result[len]-=2;
result[len-1]+=1;
}
lena--;
lenb--;
len--;
}
if(result[0]=='1')
return result;
else
return result.substr(1,result.length()-1);
}
};