You are given an array arr of size n consisting of non-empty strings.
Find a string array answer of size n such that:
answer[i] is the shortest substring of arr[i] that does not occur as a substring in any other string in arr. If multiple such substrings exist, answer[i] should be the lexicographically smallest. And if no such substring exists, answer[i] should be an empty string.Return the array answer.
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Example 1:
\n\n\nInput: arr = ["cab","ad","bad","c"]\nOutput: ["ab","","ba",""]\nExplanation: We have the following:\n- For the string "cab", the shortest substring that does not occur in any other string is either "ca" or "ab", we choose the lexicographically smaller substring, which is "ab".\n- For the string "ad", there is no substring that does not occur in any other string.\n- For the string "bad", the shortest substring that does not occur in any other string is "ba".\n- For the string "c", there is no substring that does not occur in any other string.\n\n\n
Example 2:
\n\n\nInput: arr = ["abc","bcd","abcd"]\nOutput: ["","","abcd"]\nExplanation: We have the following:\n- For the string "abc", there is no substring that does not occur in any other string.\n- For the string "bcd", there is no substring that does not occur in any other string.\n- For the string "abcd", the shortest substring that does not occur in any other string is "abcd".\n\n\n
\n
Constraints:
\n\nn == arr.length2 <= n <= 1001 <= arr[i].length <= 20arr[i] consists only of lowercase English letters.Compiled with clang 17 using the latest C++ 20 standard, and libstdc++ provided by GCC 11.
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