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Add Binary.cpp
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Add Binary.cpp
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#include<string>
#include<iostream>
using namespace std;
class Solution {
public:
char addChar(char a, char b, char &c){
char res;
if(a == '0' && b == '0'){
res = c;
c = '0';
} else if( a == '1' && b == '1'){
res = c;
c = '1';
} else {
res = c=='1'? '0': '1';
}
return res;
}
string addBinary(string a, string b) {
string result = a.size() > b.size()? '1'+a: '1'+b;
string::iterator pc = result.begin() + result.size() -1;
char carry = '0';
const char* pa = a.data() + a.size() -1;
const char* pb = b.data() + b.size() -1;
while( pa != a.data() -1 || pb != b.data() -1 ) {
if( pa == a.data() -1)
*pc-- = addChar('0',*pb--,carry);
else if(pb == b.data() -1)
*pc-- = addChar(*pa--,'0',carry);
else
*pc-- = addChar(*pa--, *pb--, carry);
}
if(carry == '0')
result.erase(result.begin());
return result;
}
};
int main(void){
Solution s;
string str1 = "11111";
string str2 = "1";
string res = s.addBinary(str1,str2);
//cout << res << endl;
getchar();
return 0;
}