Contractie graf

>

//contractia grafului
#include <stdio.h>
#include <conio.h>

void main()
{
  int n,m1,m2,i,j, a[29][29];
  //citire n si matrice din fisier
  FILE *f=fopen("c:date.txt","r");
  fscanf(f,"%dn",&n);
  for (i=1;i<=n;i++)
  for (j=1;j<=n;j++)
      fscanf(f,"%d",&a[i][j]);
     
  //citire noduri care trebuiesc lipite
  printf("Dati nodul 1:");scanf("%d",&m1);
  printf("Dati nodul 2:");scanf("%d",&m2);
  //contractie
  a[m1][m1]=0; a[m1][m2]=0; a[m2][m1]=0; a[m2][m2]=0;
  for (i=1;i<=n;i++)   
  for (j=1;j<=n;j++)
  {
  if((a[m1][j]==1)&&(j!=m2)) a[m2][j]=1;
  if((a[m2][j]==1)&&(j!=m1)) a[m1][j]=1;
  }

  //copiere linie in coloana
  for(i=1;i<=n;i++)
  {
  a[i][m1]=a[m1][i];
  a[i][m2]=a[m2][i];
  }

  //eliminare linie si coloana m2
  for(i=1;i<=n;i++)
  for(j=m2;j<=n-1;j++)
  a[i][j]=a[i][j+1];
      

 for(j=m2;j<=n-1;j++)
 for(i=1;i<=n-1;i++)
    a[j][i]=a[j+1][i];
  n--;
   
  for (i=1;i<=n;i++)   {
  for (j=1;j<=n;j++)
         printf(" %d ",a[i][j]);
         printf("n");
        }
  getch(); 
}

date.txt
8
0 0 1 0 0 0 0 0
0 0 1 0 0 0 0 0
1 1 0 1 0 0 0 0
0 0 1 0 1 1 0 0
0 0 0 1 0 0 0 0
0 0 0 1 0 0 1 1
0 0 0 0 0 1 0 0
0 0 0 0 0 1 0 0