RATSENO

public class P67 { private static 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'; } if (i >= 0){ sum += a.charAt(i--) - '0'; } sb.append(sum % 2); carry = sum / 2; } if (carry != 0){ sb.append(carry); } return sb.reverse..