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Binary_Addition.java
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Binary_Addition.java
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class Solution {
public String addBinary(String a, String b)
{
int i = a.length()-1;
int j = b.length()-1;
int carry = 0;
StringBuilder result = new StringBuilder();
while(i>=0 || j>=0)
{
int sum = carry;
if(i>=0)
{
sum += a.charAt(i) - '0';
}
if(j>=0)
{
sum+= b.charAt(j)-'0';
}
if(sum == 0 || sum == 1)
{
result.append(sum);
carry = 0;
}
else if (sum == 2)
{
result.append("0");
carry = 1;
}
else
{
result.append("1");
carry = 1;
}
i--;
j--;
}
if(carry == 1)
{
result.append("1");
}
return result.reverse().toString();
}
}