What is wrong with the code?

Question

Was solving the "Easy" problem "Halloween Candy". The code passes only through the first two cases. But the rest of the cases are hidden. So I'm unable to know what is wrong with the code.

#include <stdio.h>

int main() {
int houses;
scanf("%d", &houses);

//your code goes here
if (houses < 3)
{
return 1;
}
float answer = (2.00/houses)*100.00;
answer = round(answer);
printf("%d", (int)(answer));
return 0;
}

Answer 1

#include <math.h>
...
answer = ceil(answer)

https://www.sololearn.com/Discuss/2718934/?ref=app