View Compilation Error

0_0_21679686_28652.cpp: In function 'int main()':
0_0_21679686_28652.cpp:64:33: error: 'sort' was not declared in this scope
   sort( node+1 , node+n+1 , cmp );
                                 ^
0_0_21679686_28652.cpp:68:6: error: expected primary-expression before '<' token
      <span style="white-space:pre">  //  cout << endl;
      ^
0_0_21679686_28652.cpp:68:7: error: 'span' was not declared in this scope
      <span style="white-space:pre">  //  cout << endl;
       ^