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:
\n\n'-'. If present, it must be surrounded by lowercase characters ("a-b" is valid, but "-ab" and "ab-" are not valid)."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.
\n
Example 1:
\n\n\nInput: sentence = "cat and dog"\nOutput: 3\nExplanation: The valid words in the sentence are "cat", "and", and "dog".\n\n\n
Example 2:
\n\n\nInput: sentence = "!this 1-s b8d!"\nOutput: 0\nExplanation: There are no valid words in the sentence.\n"!this" is invalid because it starts with a punctuation mark.\n"1-s" and "b8d" are invalid because they contain digits.\n\n\n
Example 3:
\n\n\nInput: sentence = "alice and bob are playing stone-game10"\nOutput: 5\nExplanation: The valid words in the sentence are "alice", "and", "bob", "are", and "playing".\n"stone-game10" is invalid because it contains digits.\n\n\n
\n
Constraints:
\n\n1 <= sentence.length <= 1000sentence only contains lowercase English letters, digits, ' ', '-', '!', '.', and ','.1 token.Compiled with clang 11 using the latest C++ 20 standard.
Your code is compiled with level two optimization (-O2). AddressSanitizer is also enabled to help detect out-of-bounds and use-after-free bugs.
Most standard library headers are already included automatically for your convenience.
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Python 2.7.12.
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Some common data structure implementations are provided in the Algorithms module: https://www.rubydoc.info/github/kanwei/algorithms/Algorithms
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Go 1.21
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\"], \"python3\": [\"Python3\", \"Python 3.10.
Most libraries are already imported automatically for your convenience, such as array, bisect, collections. If you need more libraries, you can import it yourself.
\\r\\n\\r\\nFor Map/TreeMap data structure, you may use sortedcontainers library.
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