Add Binary
描述
Given two binary strings, return their sum (also a binary string).
For example,
a = "11"
b = "1"
Return 100.
分析
无
代码
// Add Binary
// 时间复杂度O(n)，空间复杂度O(1)
class Solution {
public String addBinary(String a, String b) {
StringBuilder result = new StringBuilder();
int i = a.length() - 1;
int j = b.length() - 1;
int carry = 0;
while(i >= 0 || j >= 0 || carry > 0) {
int valueA = i < 0 ? 0 : a.charAt(i--) - '0';
int valueB = j < 0 ? 0 : b.charAt(j--) - '0';
int sum = valueA + valueB + carry;
result.insert(0, Character.forDigit(sum % 2, 10));
carry = sum / 2;
}
return result.toString();
}
}