Package g2001_2100.s2047_number_of_valid_words_in_a_sentence

Class Solution

java.lang.Object

g2001_2100.s2047_number_of_valid_words_in_a_sentence.Solution

public class Solution
extends Object

2047 - Number of Valid Words in a Sentence\. Easy A sentence consists of lowercase letters (`'a'` to `'z'`), digits (`'0'` to `'9'`), hyphens (`'-'`), punctuation marks (`'!'`, `'.'`, and `','`), and spaces (`' '`) only. Each sentence can be broken down into **one or more tokens** separated by one or more spaces `' '`. A token is a valid word if **all three** of the following are true: * It only contains lowercase letters, hyphens, and/or punctuation ( **no** digits). * There is **at most one** hyphen `'-'`. If present, it **must** be surrounded by lowercase characters (`"a-b"` is valid, but `"-ab"` and `"ab-"` are not valid). * There is **at most one** punctuation mark. If present, it **must** be at the **end** of the token (`"ab,"`, `"cd!"`, and `"."` are valid, but `"a!b"` and `"c.,"` are not valid). Examples of valid words include `"a-b."`, `"afad"`, `"ba-c"`, `"a!"`, and `"!"`. Given a string `sentence`, return _the **number** of valid words in_ `sentence`. **Example 1:** **Input:** sentence = "cat and dog" **Output:** 3 **Explanation:** The valid words in the sentence are "cat", "and", and "dog". **Example 2:** **Input:** sentence = "!this 1-s b8d!" **Output:** 0 **Explanation:** There are no valid words in the sentence. "!this" is invalid because it starts with a punctuation mark. "1-s" and "b8d" are invalid because they contain digits. **Example 3:** **Input:** sentence = "alice and bob are playing stone-game10" **Output:** 5 **Explanation:** The valid words in the sentence are "alice", "and", "bob", "are", and "playing". "stone-game10" is invalid because it contains digits. **Constraints:** * `1 <= sentence.length <= 1000` * `sentence` only contains lowercase English letters, digits, `' '`, `'-'`, `'!'`, `'.'`, and `','`. * There will be at least `1` token.

Constructor Summary

Constructors

Constructor	Description
Solution()

Method Summary

Modifier and Type	Method	Description
int	countValidWords(String sentence)

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Details

Solution

public Solution()

Method Details

countValidWords

public int countValidWords(String sentence)