How to Solve Verifying an Alien Dictionary Problem
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Verifying an Alien Dictionary
In an alien language, surprisingly, they also use English lowercase letters, but possibly in a different order. The order of the alphabet is some permutation of lowercase letters. Given a sequence of ...
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Understanding the Verifying an Alien Dictionary Problem
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Problem Statement
In an alien language, surprisingly, they also use English lowercase letters, but possibly in a different order. The order of the alphabet is some permutation of lowercase letters. Given a sequence of words written in the alien language, and the order of the alphabet, return true if and only if the given words are sorted lexicographically in this alien language.
Verifying an Alien Dictionary
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Examples
words = ["hello","leetcode"], order = "hlabcdefgijkmnopqrstuvwxyz"trueAs 'h' comes before 'l' in this language, then the sequence is sorted.
words = ["word","world","row"], order = "worldabcefghijkmnpqstuvxyz"falseAs 'd' comes after 'l' in this language, then words[0] > words[1], hence the sequence is unsorted.
words = ["apple","app"], order = "abcdefghijklmnopqrstuvwxyz"falseThe first three characters "app" match, and the second string is shorter (in size.) According to lexicographical rules "apple" > "app", because 'l' > '∅', where '∅' is defined as the blank character which is less than any other character (More info).
Constraints
1 <= words.length <= 1001 <= words[i].length <= 20order.length == 26All characters in words[i] and order are English lowercase letters.How Interview Coder Helps with Leetcode Problems
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