LeetCode 249. Group Shifted Strings

 249. Group Shifted Strings

We can shift a string by shifting each of its letters to its successive letter.

• For example, "abc" can be shifted to be "bcd".

We can keep shifting the string to form a sequence.

• For example, we can keep shifting "abc" to form the sequence: "abc" -> "bcd" -> ... -> "xyz".

Given an array of strings strings, group all strings[i] that belong to the same shifting sequence. You may return the answer in any order.

 

Example 1:

Input: strings = ["abc","bcd","acef","xyz","az","ba","a","z"]
Output: [["acef"],["a","z"],["abc","bcd","xyz"],["az","ba"]]

Example 2:

Input: strings = ["a"]
Output: [["a"]]

 

Constraints:

• 1 <= strings.length <= 200
• 1 <= strings[i].length <= 50
• strings[i] consists of lowercase English letters.