LeetCode 520. Detect Capital
520. 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
題目大意：判斷一個字母是否大小寫正確：要麼全是大寫，要麼全是小寫，或者首字母大寫其他小寫，否則不滿足題意～
分析：判斷word[0]和word[1]的大小寫，如果word[0]是小寫，那後面必須是小寫，如果word[0]是大寫word[1]是小寫，那後面也必須是小寫，如果word[0]是大寫word[1]也是大寫那麼後面必須都是大寫～
class Solution {
public:
bool detectCapitalUse(string word) {
if (word.length() <= 1) return true;
if (islower(word[0]) || (isupper(word[0]) && islower(word[1]))) {
for (int i = 1; i < word.length(); i++)
if (isupper(word[i])) return false;
} else {
for (int i = 1; i < word.length(); i++)
if (islower(word[i])) return false;
}
return true;
}
};相關推薦
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