Big Factorials

Discussions Toph Problems
44

JavaScript D8 gives undefined for this code.

const a = readline()
console.log(a)
1 Like
46

This is an issue with D8 itself. If the line doesn’t end with \r\n, readline returns undefined

But this works for me in NodeJS

let _inputData="",_inputArray=[],_count=-1;function input(){let n=_inputArray[_count];return _count++,n}process.stdin.setEncoding("utf8"),process.stdin.on("data",(function(n){_inputData+=n})),process.stdin.on("end",(function(){_inputArray=_inputData.split("\n"),input(),main()}));

function main() {
  let a = input(); 
  console.log(a);
}

It’s a bunch of code for just taking input. But comparing to C++, it’s not much.
In C++, you have to much more things than this.

So, until a workaround comes for this problem in D8, we have nothing to do except changing the Test Cases ending to \r\n.

2 Likes
47

@Kuddus.6068 There was an issue with the test cases. None of the input files ended with line feeds. Like @Nusab19 said, D8 is very particular about how the input is laid out.

49

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

int main() {
int n;
scanf(“%d”,&n);
int i;
int a=1;
for(i=n;i>=1;i–){
a=ai;
}
int d=a;
int c=0;
while(d!=0){
d=d/10;
c++;
}
if(c<4) printf(“%d\n”,a);
else if(c>=4)
{
int e=0;
int m;
int sum=0;
while(e<4)
{
m=a%10;
a=a/10;
e++;
sum+=m(int)pow(10,e-1);

	}
	printf("%d",sum);

}
return 0;
}
what’s wrong with this?

51 
#include<stdio.h>
int main()
{
    //used long long due to the result of factorials being very high, trillion +
    long long N;//integer N

    long long factorial, last4, i;

    long long a = 1; //start of the factorial


    scanf("%lld", & N);

    for(i = 1; i<N; i++)//Factorial loop
    {
        factorial = a * (i+1);
        a = factorial;
    }

    if(factorial>=1000)//must be 4digits or more.
    {
        last4 = factorial % 10000;//last four digits
        printf("%04lld", last4);
    }
    else//for those that aren't 4 digits or more long
    {
        printf("%lld", factorial);//first four=last four
    }



    return 0;
}

Can someone help me in finding the error in this code?

1
11223×601 27.6 KB

This happens when I input my code.
Please help.

EDIT: I have figuired it out, THANKS. !!

52

@clement1raka Test your code with an input like:

55
53

Thank you, i have figuired it out.

1 Like
54 
for i in range(1,N):
	if N-i>=1:
		N_=N_*(N-i)

ans=str(N_)
g= len(ans)
if g>=4:
	print(int(ans[g-4]+ans[g-3]+ans[g-2]+ans[g-1]))
elif g==3:
	print(int(ans[g-3]+ans[g-2]+ans[g-1]))
elif g==2:
	print(int(ans[g-2]+ans[g-1]))
elif g==1:
	print(int(ans[g-1]))

what’s the problem here ?