#include <stdio.h>
#include <math.h>

int n, k;
double * data;

int ok (double z) {
 long s = 0;
 for (int i = 0; i < n; i++)
  s += floor (data[i] / z);
 return s >= k;
}

int main () {
 scanf ("%d%d", &n, &k);
 data = new double [n];
 double l;
 for (int i = 0; i < n; i++) {
  scanf ("%lf", &l);
  data[i] = l;
 }
 if (!ok(0.01)) {
  printf ("0.00\n");
  return 0;
 }
 double x = 0.01, y = 1e5, z;
 while (y - x >= 0.0001) {
  z = (x + y) / 2;
  if (ok(z)) x = z;
  else y = z;
 }
 printf ("%.2lf\n", z);
 return 0;
}

Wrong Answer.

simple test:
5 10
3.34
2.34
7.54
1.87
0.03

your answer: 1.26

but 7.54/1.25 = 5 (1.26*6 = 7.56)
and you have only 9 cables with length 1.26:

 2   +  1   +   5   +  1  +   0   = 9
3.34   2.34   7.54   1.87   0.03


a have this mistake too :))

Wrong Answer.

simple test:
5 10
3.34
2.34
7.54
1.87
0.03

your answer: 1.26

but 7.54/1.26 = 5 (1.26*6 = 7.56)
and you have only 9 cables with length 1.26:

 2   +  1   +   5   +  1  +   0   = 9
3.34   2.34   7.54   1.87   0.03


a have this mistake too :))

But this is not a correct test...
"Cable lenth is at least 1 meter"...