Tree Destructor

 template <typename T>

    class TreeNode {

     public:

        T data;

        vector<TreeNode<T>*> children;

    

        TreeNode(T data) {

            this->data = data;

        }

    

        ~TreeNode() {

            for (int i = 0; i < children.size(); i++) {

                delete children[i];

            }

        }

    };

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