LeetCode in Kotlin

520. Detect Capital

Easy

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".

Given a string word, return true if the usage of capitals in it is right.

Example 1:

Input: word = “USA”

Output: true

Example 2:

Input: word = “FlaG”

Output: false

Constraints:

• 1 <= word.length <= 100
• word consists of lowercase and uppercase English letters.

Solution

class Solution {
    fun detectCapitalUse(word: String): Boolean {
        if (word.isEmpty()) {
            return false
        }
        var upper = 0
        var lower = 0
        val n = word.length
        var firstUpper = Character.isUpperCase(word[0])
        for (i in 0 until n) {
            if (Character.isUpperCase(word[i])) {
                upper++
            } else if (Character.isLowerCase(word[i])) {
                lower++
            }
        }
        if (firstUpper && upper > 1) {
            firstUpper = false
        }
        return upper == n || lower == n || firstUpper
    }
}

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