Given a string paragraph and a string array of the banned words banned, return the most frequent word that is not banned. It is guaranteed there is at least one word that is not banned, and that the answer is unique.
The words in paragraph are case-insensitive and the answer should be returned in lowercase.
\n
Example 1:
\n\n\nInput: paragraph = "Bob hit a ball, the hit BALL flew far after it was hit.", banned = ["hit"]\nOutput: "ball"\nExplanation: \n"hit" occurs 3 times, but it is a banned word.\n"ball" occurs twice (and no other word does), so it is the most frequent non-banned word in the paragraph. \nNote that words in the paragraph are not case sensitive,\nthat punctuation is ignored (even if adjacent to words, such as "ball,"), \nand that "hit" isn't the answer even though it occurs more because it is banned.\n\n\n
Example 2:
\n\n\nInput: paragraph = "a.", banned = []\nOutput: "a"\n\n\n
\n
Constraints:
\n\n1 <= paragraph.length <= 1000' ', or one of the symbols: "!?',;.".0 <= banned.length <= 1001 <= banned[i].length <= 10banned[i] consists of only lowercase English letters.给你一个字符串 paragraph 和一个表示禁用词的字符串数组 banned ，返回出现频率最高的非禁用词。题目数据 保证 至少存在一个非禁用词，且答案 唯一 。
paragraph 中的单词 不区分大小写 ，答案应以 小写 形式返回。
\n\n
示例 1：
\n\n\n输入：paragraph = \"Bob hit a ball, the hit BALL flew far after it was hit.\", banned = [\"hit\"]\n输出：\"ball\"\n解释：\n\"hit\" 出现了 3 次，但它是禁用词。\n\"ball\" 出现了两次（没有其他单词出现这么多次），因此它是段落中出现频率最高的非禁用词。\n请注意，段落中的单词不区分大小写，\n标点符号会被忽略（即使它们紧挨着单词，如 \"ball,\"），\n并且尽管 \"hit\" 出现的次数更多，但它不能作为答案，因为它是禁用词。\n\n\n
示例 2：
\n\n\n输入：paragraph = \"a.\", banned = []\n输出：\"a\"\n\n\n
\n\n
提示：
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"editorType": "CKEDITOR",
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"style": "LEETCODE",
"exampleTestcases": "\"Bob hit a ball, the hit BALL flew far after it was hit.\"\n[\"hit\"]\n\"a.\"\n[]",
"__typename": "QuestionNode"
}
}
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