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  1. #include <string>
  2. #include <memory>
  3. #include <sstream>
  4. #include <iostream>
  5.  
  6. struct node
  7. {
  8.     using pointer = std::shared_ptr<node> ;
  9.     node( const std::string& d, const pointer& lc, const pointer& rc )
  10.         : data(d), left_child(lc), right_child(rc) {}
  11.     std::string data ;
  12.     pointer left_child ;
  13.     pointer right_child ;
  14. };
  15.  
  16. std::ostream& write( std::ostream& stm, const node::pointer& tree )
  17. {
  18.     if(tree)
  19.     {
  20.         stm << tree->data << ' ' ;
  21.         write( stm, tree->left_child ) ;
  22.         return write( stm, tree->right_child ) ;
  23.     }
  24.     else return stm << "# " ;
  25. }
  26.  
  27. node::pointer make_tree( std::istream& stm )
  28. {
  29.     std::string data ;
  30.     if( stm >> data && data != "#" )
  31.     {
  32.         auto left_child = make_tree(stm) ;
  33.         return std::make_shared<node>( data, left_child, make_tree(stm) ) ;
  34.     }
  35.     else return nullptr ;
  36. }
  37.  
  38. int main()
  39. {
  40.     std::istringstream stm( "root aaa C # # D # # string 1231 # # #" ) ;
  41.     auto tree = make_tree(stm) ;
  42.     write( std::cout, tree ) << '\n' ;
  43. }
  44.  
Success #stdin #stdout 0s 3476KB
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stdin
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Standard input is empty
stdout
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root aaa C # # D # # string 1231 # # #
https://ideone.com/KAFzYb
language:
C++14 (gcc 8.3)
created:
10 years ago
visibility:
public

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