ReverseString344.kt

package easy

/**
 *Write a function that reverses a string. The input string is given as an array of characters s.

You must do this by modifying the input array in-place with O(1) extra memory.



Example 1:

Input: s = ["h","e","l","l","o"]
Output: ["o","l","l","e","h"]
Example 2:

Input: s = ["H","a","n","n","a","h"]
Output: ["h","a","n","n","a","H"]


Constraints:

1 <= s.length <= 105
s[i] is a printable ascii characte
 */
fun reverseString(s: CharArray): Unit {
    var i=0
    var j=s.size-1
    while (i<j)
    {
        val temp=s[i]
        s[i]=s[j]
        s[j]=temp
        i++
        j--
    }
}