Create Unique BST

Author: gs146

Unique BST

@@ -0,0 +1,18 @@
+class Solution {
+public:
+    int numTrees(int n) 
+    {
+        if (n==0) return 0;
+        double ans=1, j=1;
+        for(int i=n+1;i<=2*n;i++)
+        {
+            ans*=i;
+            ans/=j++;
+            cout<<ans<<" ";
+            
+        }
+        ans/=n+1;
+        
+        return(int(ans));
+    }
+};