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AddBinary.java
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37 lines (28 loc) · 789 Bytes
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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) {
StringBuilder result = new StringBuilder();
int carry = 0;
int i = a.length() - 1;
int j = b.length() - 1;
while(i >= 0 || j >= 0) {
int sum = carry;
if(i >= 0) {
sum += a.charAt(i--) - '0';
}
if(j >= 0) {
sum += b.charAt(j--) - '0';
}
result.append(sum % 2);
carry = sum / 2;
}
if(carry != 0) {
result.append(carry);
}
return result.reverse().toString();
}
}