public String addBinary(String a, String b) { // Start typing your Java solution below // DO NOT write main() function StringBuffer a1 = (new StringBuffer(a).reverse()); StringBuffer b1 = (new StringBuffer(b).reverse()); int al = a1.length(); int bl = b1.length(); if(al=bl || b1.charAt(i)==0){ int k = a1.charAt(i)-'0'+add ; if(k==2){ k=0; add = 1; c.append(k); }else{ add = 0; c.append(k); } } else{ int k = a1.charAt(i)+b1.charAt(i)-'0'-'0'+add; if(k>=2){ k=k-2; add = 1; c.append(k); }else{ add = 0; c.append(k); } } } if(add==1){ c.append(1); } return c.reverse().toString(); }