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AddBinary.java
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AddBinary.java
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/*
Given two binary strings, return their sum (also a binary string).
The input strings are both non-empty and contains only characters 1 or 0.
Example 1:
Input: a = "11", b = "1"
Output: "100"
Example 2:
Input: a = "1010", b = "1011"
Output: "10101"
*/
class Solution {
public String addBinary(String a, String b)
{
StringBuilder sb = new StringBuilder();
int i = a.length() - 1;
int j = b.length() - 1;
int carry = 0;
while (i >= 0 || j >= 0)
{
int sum = carry;
if (j >= 0)
{
sum += b.charAt(j) - '0';
j--;
}
if (i >= 0)
{
sum += a.charAt(i) - '0';
i--;
}
sb.append(sum % 2);
carry = sum / 2;
}
if (carry != 0)
{
sb.append(carry);
}
return sb.reverse().toString();
}
}