412 - Pi

[Jan]

Edit your post and remove your code. For 10489, post it in the correct section.

[henry1007]

I hv also tried 412. The first time I count {2, 7, 2} as one pair only and get WA. Then I remove the part checking repeated numbers - count {2, 7, 2} as 3 pairs and get AC. So I think the problem supposes repeated numbers are seen as distinct ones. It make sense actually - we calculate pi by a RANDOM collection of numbers. By randomness repeated numbers are natural. Removing repeated ones disturbs the randomness.

[gba356]

Here's my code......
It gave me the correct outputs for the inputs in the fourm, but still WA......
Can somebody help me please?
I appreciate that.

Code: Select all

Code removed after AC.

Thank you Jan!!

[Jan]

Try the case below. (I have changed the input format, you can reformat it if necessary)

Input:

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37
9624 19554 20737 18465 17400 7234 8610 20921 1 31727 27779 17313 490 407 677 12325 17115 29070 18337 6863 27974 27982 13463 16266 6011 5053 1896 21767 3191 30382 29221 20064 5885 2473 24263 24571 745
0

Output:

Code: Select all

2.761513

Hope it helps.

EDIT: A second look:
Function Prime() is not fully correct and looks complicated. This function can be written simply.

[gba356]

Thanks a LOT!!
I found my Prime() function cannot deal with the number 1, so I used another recursive GCD().

I got AC eventually, THANKS!!

[bishop]

what wrong i this code
plz help abt WA

Code: Select all

code Remove d

[ayeshapakhi]

hello...

convert all float to double and change..

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if(count)
         printf("%.6f\n",res);    

into

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if(count)
         printf("%lf\n",res);    

hope it helps...

[bishop]

Thanks
it works

it accepted by %.6lf

[andysoft]

Hello everyone!
I am posting here because every test I have found in this thread passes OK, but Judge tells me I got WA. I think it is again because of precision. I use gcd and sqrt funtions...

Code: Select all

ACC :) :D

2all: To get AC - use double and only double. Not long double or float!!

[helloneo]

Try to use "double" instead of "float" ..

[andysoft]

Man, I swear, 15 minutes ago, with double it didnt work. That's why I changed for float. And now when I changed float to double it got AC!!..
Unbelievable!!!

[helloneo]

Can you remove your code if you got AC..?
Good for you anyway..

[torifat]

Why WA??

Code: Select all

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

using namespace std;

int gcd(int a, int b) {
	if(b==0) return a;
	return gcd(b,a%b);
}

int list[55];

int main() {

	int n,i,j;

	while(scanf("%d",&n)==1) {
		if(n==0) break;

		for(i=0; i<n; ++i)
			scanf("%d",&list[i]);

		int cnt=0;

		for(i=0; i<n; ++i)
			for(j=i+1; j<n; ++j)
				if(gcd(list[i],list[j])==1) cnt++;

		if(cnt==0) printf("No estimate for this data set.\n");
		else {

			double c = (double) (n*(n-1)/2);
			c=((c*6.0)/(double) cnt)+0.00000001;
			c=sqrt(c)+0.00000001;

			printf("%.6lf\n",c);
		}

	}

	return 0;
}

[torifat]

Got AC

[niloy]

Code: Select all

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

int is_CommonFact(int a,int b)
{	int temp;
	if(a==1||b==1)
		return 0;
	else
	{
	if(b>a)
	{
		temp=b;
		b=a;
		a=temp;
	}
	while(b)
	{
		temp=a%b;
		a=b;
		b=temp;
	}
	if(a==1)
		return 1;
	else
		return 0;
	}
}

int main(void)
{

	int n,count;
	int i,j,a[55];
	
	while(scanf("%d",&n)==1&&n)
	{
	count=0;
	for(i=0;i<n;i++)
	{	scanf("%d",&a[i]);
		for(j=i-1;j>=0;j--)
			if(is_CommonFact(a[j],a[i])==1)
				count++;		
	}

	if(count==0) printf("No estimate for this data set.\n");
      else {

         double PI = (double) (n*(n-1)/2);
         PI=(PI*6.0)/(double) count;
         PI=sqrt(PI);

         printf("%.6lf\n",PI);
      } 
	}

return 0;
}

[Edited by Jan. Use code tags]