preorder_tree_construction minor changes.

puzzles/interviews/training/preorder_tree_construction.cpp

@@ -1,3 +1,8 @@
+/*
+VIM: let b:lcppflags="-std=c++11 -O2 -pthread"
+VIM: let b:wcppflags="/O2 /EHsc /DWIN32"
+VIM: let b:argv=""
+*/
 #include <vector>
 #include <string>
 #include <iostream>
@@ -53,7 +58,6 @@ node * prefix_to_tree( const std::vector<double>& v ){
         }
     }
 
-    std::cout << root << std::endl;
     return root;
 }
 
@@ -74,8 +78,9 @@ void traverse( node * root, std::vector<double>& v ){
 }
 
 void test( const std::vector<double>& v ){
+    std::cout << "-----------------------------------------------------" << std::endl;
     auto r = prefix_to_tree( v );
-    //print( r );
+    print( r );
     std::vector<double> w;
     traverse( r, w );
     if ( v.size() != w.size() ) {