It says that I don't need to worry about parsing anything in C++/20 but it has no boiler plate code to parse the input, nor does it say the format of how the input will be given so I can parse it myself?

Java 8 - Solution class is missing. Even if I use the code from leaderboard submissions, it does not work anymore. I get this run time error "Error: Could not find or load main class Solution"

None of the languages I use are setup properly to work when running code?

My Java 8 Solution

boolean checkBST(Node root) {
        return isBST(root, null, null);
    }

    boolean isBST(Node root, Integer min, Integer max) {
        if (root == null) {
            return true;
        }
        
        if ((min != null && root.data <= min) || (max != null && root.data >= max)) {
            return false;
        }
        
        return isBST(root.left, min, root.data) && isBST(root.right, root.data, max);
    }

1. traverse the array in tree.
2. apply the recursive approach