A sentence is a list of words that are separated by a single space with no leading or trailing spaces. Each of the words consists of only uppercase and lowercase English letters (no punctuation).
\n\n"Hello World", "HELLO", and "hello world hello world" are all sentences.You are given a sentence s and an integer k. You want to truncate s such that it contains only the first k words. Return s after truncating it.
\n
Example 1:
\n\n\nInput: s = "Hello how are you Contestant", k = 4\nOutput: "Hello how are you"\nExplanation:\nThe words in s are ["Hello", "how" "are", "you", "Contestant"].\nThe first 4 words are ["Hello", "how", "are", "you"].\nHence, you should return "Hello how are you".\n\n\n
Example 2:
\n\n\nInput: s = "What is the solution to this problem", k = 4\nOutput: "What is the solution"\nExplanation:\nThe words in s are ["What", "is" "the", "solution", "to", "this", "problem"].\nThe first 4 words are ["What", "is", "the", "solution"].\nHence, you should return "What is the solution".\n\n
Example 3:
\n\n\nInput: s = "chopper is not a tanuki", k = 5\nOutput: "chopper is not a tanuki"\n\n\n
\n
Constraints:
\n\n1 <= s.length <= 500k is in the range [1, the number of words in s].s consist of only lowercase and uppercase English letters and spaces.s are separated by a single space.句子 是一个单词列表，列表中的单词之间用单个空格隔开，且不存在前导或尾随空格。每个单词仅由大小写英文字母组成（不含标点符号）。
\n\n\"Hello World\"、\"HELLO\" 和 \"hello world hello world\" 都是句子。给你一个句子 s 和一个整数 k ，请你将 s 截断 ，使截断后的句子仅含 前 k 个单词。返回 截断 s 后得到的句子。
\n\n
示例 1：
\n\n输入：s = \"Hello how are you Contestant\", k = 4\n输出：\"Hello how are you\"\n解释：\ns 中的单词为 [\"Hello\", \"how\" \"are\", \"you\", \"Contestant\"]\n前 4 个单词为 [\"Hello\", \"how\", \"are\", \"you\"]\n因此，应当返回 \"Hello how are you\"\n\n\n
示例 2：
\n\n输入：s = \"What is the solution to this problem\", k = 4\n输出：\"What is the solution\"\n解释：\ns 中的单词为 [\"What\", \"is\" \"the\", \"solution\", \"to\", \"this\", \"problem\"]\n前 4 个单词为 [\"What\", \"is\", \"the\", \"solution\"]\n因此，应当返回 \"What is the solution\"\n\n
示例 3：
\n\n输入：s = \"chopper is not a tanuki\", k = 5\n输出：\"chopper is not a tanuki\"\n\n\n
\n\n
提示：
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"book": null,
"isSubscribed": false,
"isDailyQuestion": false,
"dailyRecordStatus": null,
"editorType": "CKEDITOR",
"ugcQuestionId": null,
"style": "LEETCODE",
"exampleTestcases": "\"Hello how are you Contestant\"\n4\n\"What is the solution to this problem\"\n4\n\"chopper is not a tanuki\"\n5",
"__typename": "QuestionNode"
}
}
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