给你一个由不同字符组成的字符串 allowed
和一个字符串数组 words
。如果一个字符串的每一个字符都在 allowed
中,就称这个字符串是 一致字符串。
请你返回 words
数组中 一致 字符串的数目。
示例 1:
**输入:**allowed = "ab", words = ["ad","bd","aaab","baa","badab"] **输出:**2 **解释:**字符串 "aaab" 和 "baa" 都是一致字符串,因为它们只包含字符 'a' 和 'b' 。
示例 2:
**输入:**allowed = "abc", words = ["a","b","c","ab","ac","bc","abc"] **输出:**7 **解释:**所有字符串都是一致的。
示例 3:
**输入:**allowed = "cad", words = ["cc","acd","b","ba","bac","bad","ac","d"] **输出:**4 **解释:**字符串 "cc","acd","ac" 和 "d" 是一致字符串。
提示:
26`
1 <= words[i].length <= 10
allowed
中的字符 互不相同 。
words[i]
和 allowed
只包含小写英文字母。