12342 - Tax Calculator

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brianfry713
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Re: 12342 Tax Calculator

Post by brianfry713 » Tue Dec 17, 2013 2:37 am

You are using floating point with ceil and multiplying by 10.0
see: http://floating-point-gui.de/
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terry646623
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Re: 12342 Tax Calculator

Post by terry646623 » Tue Mar 11, 2014 10:53 am

Why am I got wrong answer?

Code: Select all

got ACCEPTED. I used the wrong tax calculation algorithm before XD
Last edited by terry646623 on Wed Mar 12, 2014 11:24 am, edited 2 times in total.

brianfry713
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Re: 12342 Tax Calculator

Post by brianfry713 » Tue Mar 11, 2014 8:05 pm

brianfry713 wrote:Don't use floating point at all in this problem.
Check input and AC output for thousands of problems on uDebug!

atanu.barai
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Re: 12342 Tax Calculator

Post by atanu.barai » Thu Apr 03, 2014 2:42 pm

Getting WA. Can not figure out the problem

Code: Select all

#include <iostream>
#include <string>
#include <stdlib.h>
#include <stdio.h>
#include <math.h>

using namespace std;

int main()
{
    long long amount,tax;
    int tc,i;
    cin>>tc;
    for(i=1; i<=tc; i++)
    {
//        tax = 0;
        cin>>amount;
        if(amount<=180000)
            tax = 0;
        else
        {
            amount -= 180000;
            if(amount<=300000)
            {
                tax = ceil(amount*10/100);
            }
            else if(amount>300000 && amount <=700000)
            {
//                tax = 30000;
                amount -= 300000;
                tax = 30000 + ceil(amount*15/100);
            }
            else if(amount>700000 && amount <= 1000000)
            {
//                tax = 90000;
                amount -= 700000;
                tax = 90000 + ceil(amount*20/100);
            }
            else if(amount>1000000)
            {
//                tax = 150000;
                amount -= 1000000;
                tax = 150000 + ceil(amount*25/100);
            }
            if(tax < 2000)
                tax = 2000;
        }
        cout<<"Case "<<i<<": "<<tax<<endl;
    }
}

brianfry713
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Re: 12342 Tax Calculator

Post by brianfry713 » Thu Apr 03, 2014 11:53 pm

brianfry713 wrote:
brianfry713 wrote:Don't use floating point at all in this problem.
Check input and AC output for thousands of problems on uDebug!

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Re: 12342 - Tax Calculator

Post by uDebug » Mon Sep 15, 2014 1:33 pm

brianfry713 wrote:Don't use floating point at all in this problem.
Thanks for this really key piece of advice. I wrote the program one way but changed my approach when I came here looking for test cases and saw what you'd written.

By the way, I've shared my test cases on uDebug.
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axelblaze
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Re: 12342 - Tax Calculator

Post by axelblaze » Sat Sep 20, 2014 1:36 pm

I got WA. :( tested all the inputs in udebug..
I've searched for AC codes in google and there are so many ac codes with double type and ceil function like my code. Then what's wrong with my code..?
Here's 2 links of AC code's:
(Links are deleted after getting ac)
Here's my code... plz help...

Code: Select all

Got AC...
Some other critical output can be of great help for debugging...
I'll delete the code and links aftre getting AC. thanks..
Last edited by axelblaze on Mon Sep 22, 2014 4:29 pm, edited 2 times in total.

lighted
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Re: 12342 - Tax Calculator

Post by lighted » Sun Sep 21, 2014 2:59 pm

If the calculated tax is a floating point then it must be replaced by the smallest integer greater than the payable tax.
According to problem description we must print integer greater than tax in case of floating point. So must check this case.

Change your code

Code: Select all

  break;
}

cout<<"Case "<<++count<<": ";

if(ans<2000 && ans!=0) ans=2000;
        
in = ans;

if (ans - in > 1e-6) in++;

cout<<in<<endl;
Last edited by lighted on Mon Oct 06, 2014 4:15 pm, edited 2 times in total.
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axelblaze
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Re: 12342 - Tax Calculator

Post by axelblaze » Mon Sep 22, 2014 4:27 pm

Thanks a lot.. I got ac... :) :)

lighted
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Re: 12342 - Tax Calculator

Post by lighted » Wed Sep 24, 2014 1:46 pm

Instead of checking if tax is a floating point, ceil can be used.
A person who sees the good in things has good thoughts. And he who has good thoughts receives pleasure from life... Bediuzzaman

RedCode119
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Re: 12342 - Tax Calculator

Post by RedCode119 » Thu Sep 25, 2014 6:22 pm

can't understand y "46 no line ===> if(tax-result > 1e-6 ) result++; " is not working , here's my code

Code: Select all

#include <iostream>
#include <math.h>

using namespace std;

int main()
{
    long long n,t,cnt;
    double tax;
    int result;
    cin>>t;
    cnt=1;
    while(t--)
    {

        cin>>n;
        if(n<=180000)
            cout<<"Case "<<cnt<<": 0"<<endl;
        else
        {
            if(n<=480000)
            {
                n=n-180000;
                tax=((10*n)/100);

            }
            else if(n<=880000)
            {
                n=n-480000;
                tax=30000+((15*n)/100);

            }
            else if(n<=1180000)
            {
                n=n-880000;
                tax=30000+60000+((20*n)/100);

            }
            else if(n>1180000)
            {
                n=n-1180000;
                tax=30000+60000+60000+((25*n)/100);
            }

           result=tax;
           if(tax-result > 1e-6) result++;

            if(result<2000)
            cout<<"Case "<<cnt<<": 2000"<<endl;
            else
                cout<<"Case "<<cnt<<": "<<result<<endl;
        }

        cnt++;
    }
    return 0;
}

brianfry713
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Re: 12342 - Tax Calculator

Post by brianfry713 » Fri Sep 26, 2014 1:33 am

Don't use floating point at all in this problem.
Check input and AC output for thousands of problems on uDebug!

RedCode119
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Re: 12342 - Tax Calculator

Post by RedCode119 » Fri Sep 26, 2014 9:49 am

To brainfry,
can't understand, what should i use instead of floating point ?? how can obey this condition "If the calculated tax is a floating point then it must be replaced by the smallest integer greater than the payable tax." without using floating point

lighted
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Re: 12342 - Tax Calculator

Post by lighted » Fri Sep 26, 2014 2:03 pm

Actually Brainfry is right. It is always better to avoit floating point calculation because it is very easy to get precision error or other mistakes.
For this problem to avoid floating point you could multiple by some constant number to work only with integers. You could use long long for tax and all values of tax keep multiplied by 100.

Code: Select all

tax= 10 * n;
..
tax = 30000 + 15 * n;
..
tax = 30000 + 60000 + 20 * n;
..
tax = 30000 + 60000 + 60000 + 25 * n;
..
if (tax % 100 == 0)
{
  // answer is integer = tax / 100
  // print tax / 100

} else {
  
  // answer is floating point number = tax / 100
  //  print (tax + 99) / 100;  // ceil (tax)
}
However I solved this problem with floating point. You must be very very careful in this case. In your code you have integer division mistake. You must convert to double to avoid integer divison. It can be done in different ways.
Change your code to

Code: Select all

tax=((10*n)/100.0);
..
tax=30000+((15.0*n)/100);
..
tax=30000+60000+(double(20*n)/100.0);
..
tax=30000+60000+60000+((double(25)*n)/100.0);
RedCode119 wrote:can't understand y "46 no line ===> if(tax-result > 1e-6 ) result++; " is not working
It works ok! But you can also change it to ceil

Code: Select all

result = ceil(tax);
Don't forget to remove your code after getting accepted. 8)
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vcrazy2
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Re: 12342 - Tax Calculator

Post by vcrazy2 » Sat Oct 25, 2014 11:24 pm

Hi guys,
I am getting WA consistently. I have checked Inputs frm uDebug. I found that my code doesn't allow me to work with the numbers like 10000000000 and few more like this.
How can I deal with such long floats...? Is there any way ?

Code: Select all

#include <cstdio>
#include <iostream>
#include <cmath>
using namespace std;

int main ()

{	
// The Code got accepted...Thanks
// Original Code has been DELETED. 


	return 0;
}
My code will be deleted if the code gets Accepted.
Last edited by vcrazy2 on Sun Oct 26, 2014 4:49 pm, edited 1 time in total.

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