Create Solution.cpp

Hacker-Rank/Is This a Binary Search Tree?/Solution.cpp

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+//Link of the question
+//https://www.hackerrank.com/challenges/is-binary-search-tree/problem
+
+
+/* Hidden stub code will pass a root argument to the function below. Complete the function to solve the challenge. Hint: you may want to write one or more helper functions.  
+
+The Node struct is defined as follows:
+	struct Node {
+		int data;
+		Node* left;
+		Node* right;
+	}
+*/
+vector<long unsigned int>v1;
+void check(Node* root)
+{
+    if(root==NULL)
+        return ;
+    check(root->left);
+    v1.push_back(root->data);
+    check(root->right);
+}
+	bool checkBST(Node* root) {
+		check(root);
+        for(int i=0;i<v1.size()-2;i++)
+        {
+            if(v1[i]>=v1[i+1])
+                return false;
+        }
+        return true;
+	}
+
+
+