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## Discussion of Problem 1184. Cable Master

Who can tell me what's wrong with it?
Posted by Aleksei Zobnin 5 Apr 2002 00:13
#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;
}
Re: Who can tell me what's wrong with it?
Posted by sikee8 10 Apr 2002 22:07

simple test:
5 10
3.34
2.34
7.54
1.87
0.03

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 :))
Re: Who can tell me what's wrong with it?
Posted by sikee8 10 Apr 2002 22:07

simple test:
5 10
3.34
2.34
7.54
1.87
0.03