953. Verifying an Alien Dictionary

Level - easy

Task

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.

Объяснение

Вам дан список слов words и строка order, которая представляет собой алфавит инопланетной расы. Вам нужно определить, отсортированы ли слова в списке в лексикографическом порядке согласно этому алфавиту.

Пример 1:

Вход: words = ["hello","leetcode"], order = "hlabcdefgijkmnopqrstuvwxyz"
Выход: true
Объяснение: В заданном алфавите 'h' идет перед 'l', поэтому слово "hello" идет перед "leetcode".

Пример 2:

Вход: words = ["word","world","row"], order = "worldabcefghijkmnpqstuvxyz"
Выход: false
Объяснение: В заданном алфавите 'd' идет после 'l', поэтому слово "world" не может идти перед "word".

Example 1:

Input: words = ["hello","leetcode"], order = "hlabcdefgijkmnopqrstuvwxyz"
Output: true
Explanation: As 'h' comes before 'l' in this language, then the sequence is sorted.

Example 2:

Input: words = ["word","world","row"], order = "worldabcefghijkmnpqstuvxyz"
Output: false
Explanation: As 'd' comes after 'l' in this language, then words[0] > words[1], hence the sequence is unsorted.

Example 3:

Input: words = ["apple","app"], order = "abcdefghijklmnopqrstuvwxyz"
Output: false
Explanation: The 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 <= 100
• 1 <= words[i].length <= 20
• order.length == 26
• All characters in words[i] and order are English lowercase letters.