Day2.java

/*Reverse an Array
You are given an array of integers arr[]. You have to reverse the given array.

Note: Modify the array in place.
Examples:
Input: arr = [1, 4, 3, 2, 6, 5]
Output: [5, 6, 2, 3, 4, 1]
Explanation: The elements of the array are [1, 4, 3, 2, 6, 5]. After reversing the array, the first element goes to the last position, the second element goes to the second last position and so on. Hence, the answer is [5, 6, 2, 3, 4, 1].
Input: arr = [4, 5, 2]
Output: [2, 5, 4]
Explanation: The elements of the array are [4, 5, 2]. The reversed array will be [2, 5, 4].
Input: arr = [1]
Output: [1]
Explanation: The array has only single element, hence the reversed array is same as the original. */
/*class Solution {
    public void reverseArray(int arr[]) {
        // code here
        int left=0,right=arr.length-1;
        while(left<right){
            int temp=arr[left];
            arr[left]=arr[right];
            arr[right]=temp;
            left++;
            right--;
        }
        
    }
}*/