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二进制字符串相加

分类: 文章 • 2022-06-22 21:43:53
转载自:
https://leetcode.com/problems/add-binary/discuss/

洋人写的好优雅啊


Given two binary strings, return their sum (also a binary string).

For example,
a = "11"
b = "1"
Return "100".


  1. public class Solution {
  2.     public String addBinary(String a, String b) {
  3.         if(a == null || a.isEmpty()) {
  4.             return b;
  5.         }
  6.         if(b == null || b.isEmpty()) {
  7.             return a;
  8.         }
  9.         char[] aArray = a.toCharArray();
  10.         char[] bArray = b.toCharArray();
  11.         StringBuilder stb = new StringBuilder();

  13.         int i = aArray.length - 1;
  14.         int j = bArray.length - 1;
  15.         int aByte;
  16.         int bByte;
  17.         int carry = 0;
  18.         int result;

  20.         while(i > -1 || j > -1 || carry == 1) {
  21.             aByte = (i > -1) ? Character.getNumericValue(aArray[i--]) : 0;
  22.             bByte = (j > -1) ? Character.getNumericValue(bArray[j--]) : 0;
  23.             result = aByte ^ bByte ^ carry;
  24.             carry = ((aByte + bByte + carry) >= 2) ? 1 : 0;
  25.             stb.append(result);
  26.         }
  27.         return stb.reverse().toString();
  28.     }
  29. }


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