345. Reverse Vowels of a String

Easy

Given a string s, reverse only all the vowels in the string and return it.

The vowels are 'a', 'e', 'i', 'o', and 'u', and they can appear in both lower and upper cases, more than once.

Example 1:

Input: s = "hello"
Output:
 "holle"

Example 2:

Input: s = "leetcode"
Output:
 "leotcede"

Constraints:

• 1 <= s.length <= 3 * 105

• s consist of printable ASCII characters.

解題

Runtime: 4 ms, faster than 87.88%

Memory Usage: 3.9 MB, less than 100%

func reverseVowels(s string) string {
    left := 0
    right := len(s) - 1

    newStr := []byte(s)

    for left < right {
        if checkVowels(newStr[left]) && checkVowels(newStr[right]) {
            tmp := newStr[left]
            newStr[left] = newStr[right]
            newStr[right] = tmp
            left++
            right--
        } else if !checkVowels(newStr[left]) {
            left++
        } else if !checkVowels(newStr[right]) {
            right--
        }
    }

    return string(newStr)
}

func checkVowels(char byte) bool {
    vowels := []byte{'a', 'e', 'i', 'o', 'u', 'A', 'E', 'I', 'O', 'U'}

    for i := 0; i < len(vowels); i++ {
        if char == vowels[i] { return true }
    }

    return false
}