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0067 Add Binary
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// Solution from lx223 | |
public class Solution { | |
public String addBinary(String a, String b) { | |
StringBuilder sb = new StringBuilder(); | |
int i = a.length() - 1, j = b.length() - 1, carry = 0; | |
while (i >= 0 || j >= 0) { | |
int sum = carry; | |
if (j >= 0) sum += b.charAt(j--) - '0'; | |
if (i >= 0) sum += a.charAt(i--) - '0'; | |
sb.append(sum % 2); | |
carry = sum / 2; | |
} | |
if (carry != 0) sb.append(carry); | |
return sb.reverse().toString(); | |
} | |
} |
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