344.reverse-string.md

344. Reverse String

Strightforward

fun reverseString(s: CharArray): Unit {
    for (i in 0 until s.size / 2) {
        val reverseIndex = s.size - 1 - i
        val temp = s[i]
        s[i] = s[reverseIndex]
        s[reverseIndex] = temp
    }
}

Two Pointers

fun reverseString(s: CharArray): Unit {
    var left = 0
    var right = s.size - 1
    while (left < right) {
        val temp = s[left]
        s[left] = s[right]
        s[right] = temp
        left++
        right--
    }
}