OJ Board

Posted: **Sat Jun 03, 2006 5:56 pm**

Thaks little joey now Accepted... But how could I know this?

Posted: **Sun Jun 04, 2006 12:11 am**

I don't know. I think on unix systems the newline is used as a line terminator rather than as line separator, which means that all lines, including the last, should end with a newline; my linux compiler complains if my source doesn't end in a newline, but my DOS compiler doesn't.

Anyway, just always terminate your lines, and if the output format specifies that you should print a blank line after the last case (some problems do that), just use an extra writeln:
writeln(last line of output);
writeln;

Posted: **Sun Jun 18, 2006 8:02 am**

Why you the guy's upload your code.Let us discuss about the algorithm.
If any one does not know how to use algorithm then he/she should leave
programming.

Posted: **Wed Jun 21, 2006 9:17 pm**

this code works for all test cases on my pc, but with oj it give runtime error floating point exception! somebody please help!

info:
i use sieve of eratosthenes to compute all prime nos >=2 <= 100.

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ACCEPTED!!

Posted: **Thu Jun 22, 2006 8:58 pm**

Its ok that you got RTE.
But if you use formula then you must get accepted:).

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Highest Power of a prime (P) which divides (n!) is
floor(n/p)+floor(n/p^2)+floor(n/p^3) +........+floor(n/p^h)
where p=2,3,5,7....etc

so you can do it easily with repeated division like 10!.
10/2=5
5/2=2
2/2=1

Hope you now Clear

Posted: **Thu Jun 22, 2006 9:55 pm**

That's a really cool method! Thanks! But I still don't get why the oj flags runtime error for my original program!

Posted: **Thu Jun 22, 2006 11:00 pm**

hope this will help you.
This is my SIEVE CODE. You define ur array Size.ok.

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int p[SIZE];
int k;
void prime(long SIZE)
{
	int i,j;
	bool *pr=new bool[SIZE+10];
	for(i=2;i<=MAX;i++){pr[i]=true;}
	for(i=2;i<=MAX;i++){if(!pr[i]) continue;for(j=i+i;j<=MAX;j+=i){pr[j]=false;}}
	k=0;
	for(i=2;i<=MAX;i++){if(pr[i]){p[k++]=i;}}
	delete [] pr;
}

Hope its Help.

Posted: **Fri Jun 23, 2006 1:42 am**

I don't know what but something about your sieve code is just SOO right, asif_rahman! thanks a lot! i don't know how but your code got my program accepted!

Posted: **Fri Jul 21, 2006 4:13 pm**

hey this is my code for this simple problem ............. but i get TLE ..........
why ?????

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CODE DELETED after AC :)

Posted: **Thu Aug 10, 2006 2:44 pm**

how does the first output for 53! is 49? probably i dont understand the representation. can anyone explain it to me?

Posted: **Mon Aug 14, 2006 10:09 pm**

825 could be specified as (0 1 2 0 1) meaning no twos, 1 three, 2 fives, no sevens and 1 eleven.

This problem is so easy to solve, but I don't know why WA, even if I think it works just fine. Anyone can help me?

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#include <iostream>
#include <vector>
#include <iterator>
#include <cmath>
#include <iomanip>
using namespace std;

int rez[99]; // times of primes

int main()
{
	vector<int> primes;
	primes.push_back(2);
	primes.push_back(3);
	vector<int>::iterator it;
	for(int i = 5; i < 100; i++)
	{
	    for(it = primes.begin(); it != primes.end(); ++it)
	    {
	        if(i % *it == 0)
	        {
	            break;
	        }
	    }
	    if(it == primes.end())
	    {
	        primes.push_back(i);
	    }
	}
	int n;
	cout.setf(ios::right);
	while(cin >> n)
	{
	    if(n == 0)
	    {
	        return 0;
	    }
	    for(int i = 0; i < 99; i++)
	    {
	        rez[i] = 0;
	    }
	    for(int i = 2; i <= n; i++)
	    {
	        int j = i;
	        for(it = primes.begin(); *it <= n; ++it)
	        {
	            while(j % *it == 0)
	            {
	                ++rez[*it];
	                j /= *it;
	            }
	            if(j == 1)
	            {
	                break;
	            }
	        }
	    }
	    cout << setw(3) << n << "! =";
	    int count = 0;
	    for(it = primes.begin(); *it <= n; ++it)
	    {
	        if(count % 15 == 0 && count)
	        {
                cout << endl << setw(9) << rez[*it];
	        }
	        else
	        {
	            cout << setw(3) << rez[*it];
	        }
	        ++count;
	    }
	    cout << endl;
	}
	return 0;
}

Posted: **Wed Aug 16, 2006 5:42 am**

sorry to bother again.......

got WA but hav no idea whyyyyyy????
everything seems to be so perfect..read all prev threads too and thus got sure abt my output format....then where is the mistake?can any1 say

i'm getting frustrated.

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removed

maybe the mistake is silly...but in return wat i'm getting is not so silly...
so thanx in advance

Posted: **Wed Aug 16, 2006 10:59 am**

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printf("\n      ");

Above statement will be executed for any N. But it should be executed for those only whose factorial have more than 15 prime factors.

Posted: **Wed Aug 16, 2006 4:28 pm**

thanx a lt bro...the mistake is in the 2nd for loop condition....how cud i be so stupid

thanx again.

Posted: **Thu Aug 24, 2006 7:06 pm**

code deleted

OJ Board

160 - Factors and Factorials

160 - RUNTIME ERROR!!

160

160 - Dont Understand

ACM 160 I get WA many time , I do not Why, please healp me