Recognize the Three Valid Capitalization Patterns

### Problem Return whether word uses one of three patterns: all uppercase letters, all lowercase letters, or only its first letter uppercase. Input contains English letters only. ```cpp class Solution { public: bool detectCapitalUse(string word); }; ``` ### Examples **Example 1:** ```text word = "River" Output: true Explanation: Only the first character is uppercase. ``` **Example 2:** ```text word = "riVer" Output: false Explanation: A later uppercase character violates all three patterns. ``` ### Constraints - The word contains 1..100 characters; each is an English uppercase or lowercase letter. ### Clarifying Questions Check the position of a lone uppercase letter as well as its count. ```hint Read the boundary condition Can the three permitted patterns be expressed using one uppercase count? ``` ### Contract considerations Check the position of a lone uppercase letter as well as its count.