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| class Solution {
public String addBinary(String a, String b) {
int i = a.length() - 1, j = b.length() - 1;
StringBuilder sb = new StringBuilder();
int carry = 0;
while (i >= 0 || j >= 0 || carry > 0) {
int x = i >= 0 ? a.charAt(i--) - '0' : 0;
int y = j >= 0 ? b.charAt(j--) - '0' : 0;
int sum = carry + x + y;
sb.append(sum & 1);
carry = sum >> 1;
}
return sb.reverse().toString();
}
}
|
References
67. Add Binary
剑指 Offer II 002. 二进制加法