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AddBinary.java
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AddBinary.java
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package com.hncboy;
/**
* @author hncboy
* @date 2019/12/7 9:19
* @description 67.二进制求和
*
* 给定两个二进制字符串,返回他们的和(用二进制表示)。
* 输入为非空字符串且只包含数字 1 和 0。
*
* 示例 1:
* 输入: a = "11", b = "1"
* 输出: "100"
*
* 示例 2:
* 输入: a = "1010", b = "1011"
* 输出: "10101"
*/
public class AddBinary {
public static void main(String[] args) {
AddBinary a = new AddBinary();
System.out.println(a.addBinary("11", "1"));
System.out.println(a.addBinary("1010", "1011"));
}
private String addBinary(String a, String b) {
StringBuilder result = new StringBuilder();
int sum = 0;
for (int i = a.length() - 1, j = b.length() - 1; i >= 0 || j >= 0; i--, j--) {
sum += i >= 0 ? a.charAt(i) - '0' : 0;
sum += j >= 0 ? b.charAt(j) - '0' : 0;
result.append(sum % 2);
// 计算进位
sum /= 2;
}
// 进位是1的话补1
result.append(sum == 1 ? sum : "");
return result.reverse().toString();
}
}