LeetCode-in-Java
1903. Largest Odd Number in String
Easy
You are given a string num, representing a large integer. Return the largest-valued odd integer (as a string) that is a non-empty substring of num, or an empty string "" if no odd integer exists.
A substring is a contiguous sequence of characters within a string.
Example 1:
Input: num = “52”
Output: “5”
Explanation: The only non-empty substrings are “5”, “2”, and “52”. “5” is the only odd number.
Example 2:
Input: num = “4206”
Output: “”
Explanation: There are no odd numbers in “4206”.
Example 3:
Input: num = “35427”
Output: “35427”
Explanation: “35427” is already an odd number.
Constraints:
1 <= num.length <= 105numonly consists of digits and does not contain any leading zeros.
Solution
public class Solution {
public String largestOddNumber(String num) {
String str = "";
for (int i = num.length() - 1; i >= 0; i--) {
char c = num.charAt(i);
if (c % 2 == 1) {
str = num.substring(0, i + 1);
break;
}
}
return str;
}
}