964 - Custom Language

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mf
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Post by mf »

I'm getting a TLE, and I can't understand why. Could anyone point out a mistake in my code, please?
Or is that because the code is just inefficient, and I should switch to hand-made data structures instead of STL's?

Code: Select all

(removed)
Last edited by mf on Mon Nov 06, 2006 12:19 am, edited 1 time in total.
rio
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Post by rio »

I found two points that might cause TLE.

In your code reading section, i think this is a mistake.

Code: Select all

if (!isalpha(s[0])) continue; 
This ABORTS valid case like

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READ
    POP    defined 
PUSH defined
   WRITE
#
1
#
and doesn't ABORTS invalid case like

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READ
777 good luck!
POP defined
PUSH defined
WRITE
#
1
#
The second point is that your code executes the program without parsing.
I think this is very inefficient, especially with case like

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PUSH 10000000
POP counter
PUSH 1
WRITE
PUSH 1
PUSH counter
SUB
POP counter
PUSH counter
JUMPPOS 3
DIE This aborts! (*_*)b
#
#
mf
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Post by mf »

Thanks! I've got accepted. The code was just slow.

But there are no cases with invalid inputs or leading whitespaces like what you mentioned. I've verified with asserts.
sclo
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Post by sclo »

I keep getting either TLE or WA. Is there any extra white space or empty lines in the input?
sclo
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Post by sclo »

In particular, I used assert to detect that there are lines with '#' containing leading spaces. Could someone please check the validity of judge input?

Anyway, here's part of my code:
The judge now always says WA with 0.004s, which is very strange.

Code: Select all

REMOVED:)

Last edited by sclo on Fri Jun 29, 2007 10:33 pm, edited 1 time in total.
little joey
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Post by little joey »

I'm pretty sure the judge input is valid. The case you mention doesn't occur:

Code: Select all

#include <stdio.h>
#include <assert.h>

int main(){
   static char line[1024];
   int i;
   
   while(fgets(line,sizeof(line),stdin)!=NULL){
      for(i=0;line[i];i++){
         if(line[i]=='#') assert(i==0);
         }
      }
      
   return 0;
   }
gives WA on the judge, not RE.

If you send me your complete code, I can run it against the judge input. Since I'm not great with C++, it would help if it produced sensible error messages in case of irregularities, not just abort().
I'm away for the weekend, so it may take some time for me to respond.
The biggest problem with most problems is not how to solve the problem, but how to not solve what is not the problem.
sclo
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Post by sclo »

Little joey: I'll first rewrite my I/O routines. If there's still a problem, I'll send it to you. Thanks.

Edit: There was indeed some problems with I/O, now I got AC.
sdipu
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Re: 964 - Custom Language

Post by sdipu »

This problem is driving me completely crazy. No matter what I do, I can't get Accepted!!! :evil: :evil: :evil:

Please help! Here is my code-

Code: Select all

Never mind! Accepted. 
It was a problem with taking input.
Check out UVA Arena - a software build for UVA solvers @ http://dipu-bd.github.io/UVA-Arena/
LeonKi

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metaphysis
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Re: 964 - Custom Language

Post by metaphysis »

The specification of input data format is not so clear.
I submited so many times (>=27) and used a lot of assert, finally, I got AC, YEAH!
There is some tips:
1. End of instruction block or data block is a line start with '#', no leading space, but may with tailing space, so use line.front() == '#' but not line == "#";
2. In data block, there are all integer, means there are all REALY integer, for example, 100, -23, 10902, etc. but may with leading space.
3. There are NO empty line in judge input.
5. You can find more useful tips from other posts above.
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