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Leetcode
Easy
Strings
Detect Capital
Determine whether the capitalization pattern of a word is valid.
Acceptance 50%
Problem Statement
Problem
Given a word, determine whether it uses capital letters correctly.
A word is considered to have correct capitalization if one of the following is true:
- All letters are uppercase.
- All letters are lowercase.
- Only the first letter is uppercase and all remaining letters are lowercase.
Return true if the word is correctly capitalized, otherwise return false.
Notes
- Treat the input as a single word with alphabetic characters only.
- The answer depends only on the letter casing pattern.
Input Format
- A single string
wordconsisting of English letters.
Output Format
- Return
trueif the capitalization is valid, otherwise returnfalse.
Constraints
1 <= word.lengthwordcontains only alphabetic English letters.
Examples
Sample cases returned by the problem API.
Example 1
Input
word = "USA"
Output
true
Explanation
All letters are uppercase.
Example 2
Input
word = "leetcode"
Output
true
Explanation
All letters are lowercase.
Show 2 more examples
Example 3
Input
word = "Google"
Output
true
Explanation
Only the first letter is uppercase.
Example 4
Input
word = "FlaG"
Output
false
Explanation
The capitalization does not match any allowed pattern.
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