Leetcode - Add Binary -Jan 30, 2015
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Leetcode - add binary String
Given two binary strings, return their sum (also a binary string).
For example,
a = "11"
b = "1"
Return "100".
For example,
a = "11"
b = "1"
Return "100".
public class Solution { public String addBinary(String a, String b) { StringBuilder str = new StringBuilder();int alen = a.length() ;int blen = b.length();int count = 0;int carry = 0;if(alen == blen) {for(int i=alen-1; i >= 0; i--) {if(a.charAt(i) == '1') {count++;}if( b.charAt(i) == '1') {count++;}if(carry == 1 ) {count++;}carry = (count > 1 ? 1: 0);str.insert(0,((count ==0 ) || count ==2)? '0': '1' );count = 0;}if( carry==1) {str.insert(0, '1');}}if(alen > blen) {b = "0" + b;System.out.println("b="+ b);return addBinary(a, b);}if(alen < blen) {a = "0" +a;return addBinary(a,b);} return str.toString(); } 0 0
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