left_view_of_tree.cpp

Trees/leftviewoftree.cpp

@@ -0,0 +1,62 @@
+// C++ program to print left view of Binary Tree
+#include <bits/stdc++.h>
+using namespace std;
+
+struct Node
+{
+int data;
+struct Node *left, *right;
+};
+
+
+struct Node *newNode(int item)
+{
+struct Node *temp = (struct Node *)malloc(
+sizeof(struct Node));
+temp->data = item;
+temp->left = temp->right = NULL;
+return temp;
+}
+
+// left view of a binary tree.
+void leftViewUtil(struct Node *root,
+int level, int *max_level)
+{
+
+if (root == NULL) return;
+
+
+if (*max_level < level)
+{
+cout << root->data << " ";
+*max_level = level;
+}
+
+leftViewUtil(root->left, level + 1, max_level);
+leftViewUtil(root->right, level + 1, max_level);
+
+}
+
+
+void leftView(struct Node *root)
+{
+int max_level = 0;
+leftViewUtil(root, 1, &max_level);
+}
+
+int main()
+{
+Node* root = newNode(10);
+root->left = newNode(2);
+root->right = newNode(3);
+root->left->left = newNode(7);
+root->left->right = newNode(8);
+root->right->right = newNode(15);
+root->right->left = newNode(12);
+root->right->right->left = newNode(14);
+
+leftView(root);
+
+return 0;
+}
+