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, like "Google".
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.
Related Topics:
String
// OJ: https://leetcode.com/problems/detect-capital/
// Author: github.com/lzl124631x
// Time: O(N)
// Space: O(1)
class Solution {
public:
bool detectCapitalUse(string word) {
if (word.size() < 2) return true;
bool a = isupper(word[0]), b = isupper(word[1]), upper = a && b;
if (!a && b) return false;
for (int i = 2; i < word.size(); ++i) {
if (isupper(word[i]) > 0 != upper) return false;
}
return true;
}
};// OJ: https://leetcode.com/problems/detect-capital/
// Author: github.com/lzl124631x
// Time: O(N)
// Space: O(1)
class Solution {
public:
bool detectCapitalUse(string word) {
int cnt = 0;
for (char c : word) cnt += isupper(c) > 0;
return !cnt || cnt == word.size() || cnt == 1 && isupper(word[0]);
}
};