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  int fast_sort (int *a, int left, int right)
  {
      int i = left, j = right;
      int middle = a[(left+right) / 2];
 
      while (i < middle && a[i] < middle) i++;
      while (j > left && a[j] > middle) j--;
 
      if (i <= j) {
          swap (&a[i], &a[j]);
          ++i;
          --j;
      }
 
      if (i < right)
          fast_sort (a, i, right);
      if (j > left)
          fast_sort (a, left, j);
 
	  return 0;
	}
 

prog.c: In function 'fast_sort':
prog.c:11:11: warning: implicit declaration of function 'swap' [-Wimplicit-function-declaration]
           swap (&a[i], &a[j]);
           ^
/usr/lib/gcc/i586-linux-gnu/5/../../../i386-linux-gnu/crt1.o: In function `_start':
(.text+0x18): undefined reference to `main'
/home/HemrJI/cctMMI6G.o: In function `fast_sort':
prog.c:(.text+0xb6): undefined reference to `swap'
collect2: error: ld returned 1 exit status

Standard output is empty