#include "header.h"
int main(){
  clock_t start,stop;
  int 		Counts[256][256]={0}; 
  unsigned char   uc[NMax+1]; 
  unsigned char	cOld, cNew;
  FILE *fin;
  FILE *fout;
  char		Format[200];	
  int           i, j, n;
  sprintf(Format, "%%%dc", NMax); 
  fin=fopen("book.txt","r");
  start=clock();
  while(fscanf(fin,Format,uc)>0)
  {
        n = strlen(uc);
        cOld=uc[0];
        for (i=0;i<=n;i++) {
          cNew = uc[i];
  	  Counts[(int)cOld][(int)cNew]++;   
  	  cOld=cNew;
 	  }
   }
stop=clock();
fout=fopen("result.txt","w");
for(i=0;i<256;i++)
  {
    for(j=0;j<256;j++)
    {
      if(Counts[i][j]!=0)
         {
	    if(i>31 && i<256 && j>31 && j<256) 
	      fprintf(fout,"%c%c\t%d\n",i,j,Counts[i][j]);
	    else if(i>31 && i<256)
	    fprintf(fout,"%c\t%d\n",i,Counts[i][j]);
	    else if(j>31 && j<256)
	    fprintf(fout,"%c\t%d\n",j,Counts[i][j]);
	    else
	    fprintf(fout,"\t%d\n",Counts[i][j]);
          }
     }
   }
  printf("%d and %d\n", start, stop);
  printf("\nElapsed time = %g Seconds\n", (stop-start)/((double) CLOCKS_PER_SEC)); 
fclose(fout);
fclose(fin);
  return 0;
}