Largest Odd Number in String Leetcode Solution

Largest Odd Number in String

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.

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 <= 105
  • num only consists of digits and does not contain any leading zeros.

Program:

Found = False
length = len(num)
Largest = 0
for i in range(length)[::-1]:
    if (int(num[i])%2 != 0):
        Largest = i
        Found = True
        break
if Found == True:
    return(num[:Largest+1])
else: 
    return ""

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