leetcode 2451. Odd String Difference

https://leetcode.com/problems/odd-string-difference/description/

Odd String Difference - LeetCode

 

class Solution:
    def oddString(self, words: List[str]) -> str:
        #calculate difference among input string
        def cal_difference(s: str) -> list[int]:
            difference_array = []
            for i in range(1,len(s)):
                #ord('a') equals 97 
                difference_array.append(ord(s[i])-97 - (ord(s[i-1])-97) )
            return difference_array
        list_difference = []
        for word in words:
            list_difference.append(cal_difference(word))
        
        for sublist in list_difference:
            # count() == 1 means , This sublist is only one value among other values
            if list_difference.count(sublist) == 1:
                answer = words[list_difference.index(sublist)]
                return answer