diff --git a/w4/w4.cpp b/w4/w4.cpp
index e69de29..7a952a3 100644
--- a/w4/w4.cpp
+++ b/w4/w4.cpp
@@ -0,0 +1,112 @@
+
+#include <iostream>
+#include <vector>
+using namespace std;
+
+struct Node {
+	Node* parent;
+	char data;
+	Node* leftChild;
+	Node* rightChild;
+
+	Node(char data) :data(data) {
+		parent = nullptr;
+		leftChild = nullptr;
+		rightChild = nullptr;
+	}
+
+	void insertLeft (Node* left) {
+		left->parent = this;
+		this->leftChild = left;
+	}
+	void insertRight(Node* right) {
+		right->parent = this;
+		this->rightChild = right;
+	}
+
+};
+
+class Tree {
+private:
+	Node* root;
+	vector<Node*> list;
+public:
+	Tree(){
+		root = nullptr;
+	}
+
+	Node* findNode(char data) {
+		for (Node* n : list) {
+			if (n->data == data)
+				return n;
+		}
+		Node* newNode = new Node(data);
+		list.push_back(newNode);
+
+		if (data == 'A') {
+			root = newNode;
+		}
+		return newNode;
+	}
+
+	void setNode(char parentData, char left, char right) {
+		Node* parent = findNode(parentData);
+
+		if (left != '.') {
+			Node* child = findNode(left);
+			parent->insertLeft(child);
+		}
+		if (right != '.') {
+			Node* child = findNode(right);
+			parent->insertRight(child);
+		}
+	}
+
+	Node* getRoot() const { return root; }
+
+
+	void preorder(Node* node) {
+		if (!node)
+			return;
+
+		cout << node->data;
+		preorder(node->leftChild);
+		preorder(node->rightChild);
+	}
+	void inorder(Node* node) {
+		if (!node)
+			return;
+
+		inorder(node->leftChild);
+		cout << node->data;
+		inorder(node->rightChild);
+	}
+
+	void postorder(Node* node) {
+		if (!node)
+			return;
+
+		postorder(node->leftChild);
+		postorder(node->rightChild);
+		cout << node->data;
+	}
+
+};
+
+int main() {
+	int n;
+	char parent, left, right;
+	cin >> n;
+
+	Tree tree;
+	for (int i = 0; i < n; ++i) {
+		cin >> parent >> left >> right;
+		tree.setNode(parent, left, right);
+	}
+
+	tree.preorder(tree.getRoot()); cout << '\n';
+	tree.inorder(tree.getRoot()); cout << '\n';
+	tree.postorder(tree.getRoot()); cout << endl;
+
+	return 0;
+}
\ No newline at end of file