2451 - Odd String Difference.

Easy

You are given an array of equal-length strings words. Assume that the length of each string is n.

Each string words[i] can be converted into a difference integer array difference[i] of length n - 1 where difference[i][j] = words[i][j+1] - words[i][j] where 0 <= j <= n - 2. Note that the difference between two letters is the difference between their positions in the alphabet i.e. the position of 'a' is 0, 'b' is 1, and 'z' is 25.

• For example, for the string "acb", the difference integer array is [2 - 0, 1 - 2] = [2, -1].

All the strings in words have the same difference integer array, except one. You should find that string.

Return the string in words that has different difference integer array.

Example 1:

Input: words = "adc","wzy","abc"

Output: "abc"

Explanation:

• The difference integer array of "adc" is 3 - 0, 2 - 3 = 3, -1.

• The difference integer array of "wzy" is 25 - 22, 24 - 25= 3, -1.

• The difference integer array of "abc" is 1 - 0, 2 - 1 = 1, 1.

The odd array out is 1, 1, so we return the corresponding string, "abc".

Example 2:

Input: words = "aaa","bob","ccc","ddd"

Output: "bob"

Explanation: All the integer arrays are 0, 0 except for "bob", which corresponds to 13, -13.

Constraints:

• 3 <= words.length <= 100

• n == words[i].length

• 2 <= n <= 20

• words[i] consists of lowercase English letters.