1684. 统计一致字符串的数目

题目

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:

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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:

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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:

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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:

  • 1 <= words.length <= 104
  • 1 <= allowed.length <= 26
  • 1 <= words[i].length <= 10
  • allowed 中的字符 互不相同
  • words[i]allowed 只包含小写英文字母。

解法

解法一:

Java

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public int countConsistentStrings(String allowed, String[] words) {
int[] chars = new int[26];
for (char c : allowed.toCharArray()) {
chars[c - 'a']++;
}

int count = 0;
for (String w : words) {
boolean flag = true;
for (char c : w.toCharArray()) {
if (chars[c - 'a'] == 0) {
flag = false;
break;
}
}
if (flag) {
count++;
}
}
return count;
}
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