text: #ifndef MST_H
  
  #define MST_H
  
  #include <stdio.h>
  #include <stdlib.h>
  #include <time.h>
  #include "unionfind.h"
  #include "quicksort.h"
  #include "edges.h"
  #include "scan.h"
  
  #endif
  
  edge_set mst_calc(edge_set s, int n) ;
  