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AddBinary.java

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/**

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

*

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

*/

public class AddBinary {

public String addBinary(String a, String b) {

int i = a.length() - 1;

int j = b.length() - 1;

int da = 0;

int db = 0;

int adv = 0;

StringBuffer result = new StringBuffer();

while (i >= 0 && j >= 0) {

da = a.charAt(i--) == '0' ? 0 : 1;

db = b.charAt(j--) == '0' ? 0 : 1;

int d = da + db + adv;

result.append(d % 2 == 0 ? '0' : '1');

adv = d >> 1;

}

if (i >= 0) {

while (i >= 0) {

da = a.charAt(i--) == '0' ? 0 : 1;

int d = da + adv;

result.append(d % 2 == 0 ? '0' : '1');

adv = d >> 1;

}

} else if (j >= 0) {

while (j >= 0) {

db = b.charAt(j--) == '0' ? 0 : 1;

int d = db + adv;

result.append(d % 2 == 0 ? '0' : '1');

adv = d >> 1;

}

}

if (adv == 1) {

result.append('1');

}

return result.reverse().toString();

}

}