Tree: Preorder Traversal

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    C++ (more at https://github.com/IhorVodko/Hackerrank_solutions , feel free to give a star :) )

        void preOrder(Node * _root){
            using namespace std;
            if(!_root){
                return;
            }
            cout << _root->data << " ";
            preOrder(_root->left);
            preOrder(_root->right);
        }