Time limit getting exceeded and also the program not seeming to work for N>=60 in FCTRL question in easy practice problems section. What is wrong with my code?

I ran it on gdb and found that as your N goes above 60 then t and p become very large and reach the max value they can hold and hence program isn’t working for N>60. I saw the solution in the submissions column of the problem but i am not able to comprehend it. Pls explain what the mistake is in my program and what is the best way to implement it . thanks …

```
#include<stdio.h>
int z(unsigned long);
int main(void)
{
unsigned long t=0,i;
scanf("%lu",&t);
for(i=0;i<t;i++)
{
unsigned long n;
scanf("%lu",&n);
if(n>=1&&n<=1000000000)
{
int ctr=z(n);
printf("%d\n",ctr);
}
else
return 0;
}
return 0;
}
int z(unsigned long n)
{
int tz=0;
unsigned long long t,p=1;
t=n;
while(1)
{
printf("n=%lu t=%llu tz=%d p=%llu\n ",n,t,tz,p);
n--;
p=t*n;
while(p%10==0)
{
p/=10;
tz++;
}
t=p;
if(n<=1)
break;
}
return tz;
}
```