https://leetcode.com/problems/detect-capital/
Given a word, you need to judge whether the usage of capitals in it is right or not.
We define the usage of capitals in a word to be right when one of the following cases holds:
- All letters in this word are capitals, like "USA".
- All letters in this word are not capitals, like "leetcode".
- Only the first letter in this word is capital if it has more than one letter, like "Google".
Otherwise, we define that this word doesn't use capitals in a right way.
Example 1:
Input: "USA" Output: True
Example 2:
Input: "FlaG" Output: False
Note: The input will be a non-empty word consisting of uppercase and lowercase latin letters.
代码:
class Solution { public: bool detectCapitalUse(string word) { int len = word.length(); int big = 0, small = 0; for(int i = 0; i < len; i ++) { if(word[i] >= 'a' && word[i] <= 'z') small ++; else if(word[i] >= 'A' && word[i] <= 'Z') big ++; } if(small == len || big == len) return true; if(big == 1 && big + small == len && word[0] >= 'A' && word[0] <= 'Z') return true; return false; } };