272 - TEX Quotes

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Zhichao Li
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Problem 272: TeX Quotes

Post by Zhichao Li » Sun May 05, 2002 11:04 am

Could you tell my why I got wrong answers?

[pascal] {$E+,I-,N+,Q-,R-,S-}

var
c:char;
ch:char;

begin
c:='`';
while not(eof(input)) do
begin
read(ch);

if ch='"' then
begin
write(c,c);
if c='`' then c:=''''
else c:='`';
end
else write(ch);
end;
end.[/pascal]

ec3_limz
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Location: Singapore

i think i understand why

Post by ec3_limz » Tue Jul 09, 2002 4:45 pm

Instead of outputting 1 backquote "`", you should output 2: "``".

That is what I see so far. Try it first.

Good luck!

jiangwen
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it returns wrong answer?!!!(No272)

Post by jiangwen » Sat Oct 05, 2002 3:18 am

my program returns exactly the right answer in my view:

"To be or not to be," quoth the Bard, "that
is the question".
The programming contestant replied: "I must disagree.
To `C' or not to `C', that is The Question!"
^Z
``To be or not to be,'' quoth the Bard, ``that
is the question''.
The programming contestant replied: ``I must disagree.
To `C' or not to `C', that is The Question!''
Press any key to continue


but the judge-system said it returned wrong answer!
i really can't find out where 's the mistake.

and that's my source file in C++:

[cpp]
#include "iostream.h"
#include "stdio.h"
#include "malloc.h"
void main()
{
struct charlist
{
char alpha;
charlist * next;
};
char ch;
bool lq;
struct charlist* first,*p,*pre;
first=(struct charlist*)malloc(sizeof(charlist));
first->alpha='a';
pre=first;
ch=getchar();
while (true)
{
if (ch=='"')
{
if (lq)
{
ch='`';
lq=!lq;
p=(charlist*)malloc(sizeof(charlist));
p->alpha=ch;
pre->next=p;
p->next=NULL;
pre=p;
p=(charlist*)malloc(sizeof(charlist));
p->alpha=ch;
pre->next=p;
p->next=NULL;
pre=p;
}
else
{
ch='\'';
lq=!lq;
p=(charlist*)malloc(sizeof(charlist));
p->alpha=ch;
pre->next=p;
p->next=NULL;
pre=p;
p=(charlist*)malloc(sizeof(charlist));
p->alpha=ch;
pre->next=p;
p->next=NULL;
pre=p;
}
}
else
{
p=(charlist*)malloc(sizeof(charlist));
p->alpha=ch;
pre->next=p;
p->next=NULL;
pre=p;
}
if (ch==EOF) break;
ch=getchar();
}
p=first->next;
while(p!=NULL)
{
putchar(p->alpha);
p=p->next;
}
pre=first;
p=pre->next;
while (pre!=NULL)
{
p=pre->next;
free(pre);
pre=p;
}
}
[/cpp]


So,please help me,tell me where's the problem?thank you very very very much![/cpp]

Jalal
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Post by Jalal » Fri Jan 10, 2003 10:54 am

I dont know why u deals with this components like '/' in this problem.
Its so easy. Just print ` ` for the first " and for the secon print the "
thats all. Just a simple for loop which will count even and odd numbered "
in the problem and for odd it will print ` ` and for the even it will print
"
thats all.
not more than this :wink:

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Sarmento
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Problem 272 - Why is it a wrong answer?

Post by Sarmento » Tue Apr 22, 2003 10:01 pm

Can anyone tell me what's the problem with this?????
It's converting all the sentences perfectly.....

Thanks in advance,

joao sarmento

[java]
// @JUDGE_ID: 30701AE 272 Java
import java.io.*;
class Main{

static String ReadLn (int maxLg){
byte lin[] = new byte [maxLg];
int lg = 0, car = -1;
String line = "";

try
{
while (lg < maxLg)
{
car = System.in.read();
if ((car < 0) || (car == '\n'))
break;
lin [lg++] += car;
}
}
catch (IOException e)
{
return (null);
}

if ((car < 0) || (lg == 1)) return (null); // eof
return (new String (lin, 0, lg));
}

public static void main (String args[]){
Main myWork = new Main(); // create a dinamic instance
myWork.Begin(); // the true entry point
}

void Begin(){
int l;
boolean closing_quote;
String str;

while((str = Main.ReadLn(255)) != null){
l = str.length();
closing_quote = false;
for(int i = 0; i < l;i++){
if (str.charAt(i) == '"'){
if (closing_quote)
str = str.substring(0,i) + "''" + str.substring(i+1);
else
str = str.substring(0,i) + "``" + str.substring(i+1);
closing_quote = !closing_quote;
}
l = str.length();
}
System.out.println(str);
}

}
}[/java]
-----------------
Jo

soyoja
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Post by soyoja » Wed Apr 23, 2003 3:01 am

In fact, I don't know about Java code...

But in your program, you read an input string line by line.

I think it's not a good method.

Fix your code that reading one character at a time and converting

character each time. I don't know what type of input data will come in.

So I think using character buffer is so dangerous.

P.S ) It's one of the simplest and easiest problem in valladolod problem set. Cheer up~ : )
I love Problem Solving!!! :) :) :)

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Sarmento
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Location: Lisboa, Portugal

Line by line or the whole thing

Post by Sarmento » Wed Apr 23, 2003 1:48 pm

In this problem you should fetch sentence by sentence, transform and print it or fetch them all and just then transform and print them?
-----------------
Jo

Nick
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about the input

Post by Nick » Wed Apr 23, 2003 2:29 pm

1. There will be one input and in multiple lines.
2. So one sentence can be in two or more lines.
3. And one line can be more than 255 characters.
4. You always set closing_quote to false each line of input
This means your code will output two "``" s on a parsed sentence

Okay, good luck Sarmento!!

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Sarmento
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Post by Sarmento » Wed Apr 23, 2003 4:52 pm

How do I check for the EOF in java? In C you have '\0', but how about in Java? Is the "\n" too?
-----------------
Jo

turuthok
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Post by turuthok » Wed Apr 23, 2003 7:59 pm

When you use System.in.read() and it returns a negative value ... assume it's EOF ...

By the way, '\n' is newline, ... it's not EOF.

-turuthok-
The fear of the LORD is the beginning of knowledge (Proverbs 1:7).

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Sarmento
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Post by Sarmento » Wed Apr 23, 2003 8:53 pm

I decided to try another aproach (more C like), and it was Acc(P.E.).

Thanks

joao sarmento

[java]
import java.io.*;
class Main{

public static void main (String args[]){
Main myWork = new Main(); // create a dinamic instance
myWork.Begin(); // the true entry point
}

void Begin(){
int c = 0;
boolean closing_quote = false;
String opening = "``";
String closing = "\'\'";
while (c>=0){
try{
c = System.in.read();
}
catch(IOException e){
System.out.println(e.getMessage());
System.out.println("Fatal error. Ending Program.");
System.exit(0);
}
if (c == '\"'){
System.out.print(closing_quote?closing:opening);
closing_quote = !closing_quote;
}
else
System.out.print((char) c);
}
}
}[/java]
-----------------
Jo

soyoja
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Post by soyoja » Thu Apr 24, 2003 4:30 am

Dear Sarmento.

Congratulations.. But I suggest an opinion.
Please do not post your accepted code...
I think it's no benefit to us ( Especially someone who not solved this
problem yet ). I believe you understand my words.
Thanks.

Alexander Denisjuk
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Post by Alexander Denisjuk » Wed May 21, 2003 9:40 am

By the way, if you wish something more complicated, consider my variant of main (I skip details):
[cpp]
int main(){
automat A;
while(cin>>A>>cout);
return 0;
}
[/cpp]
:wink:

acm_beginner
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Problem 272 - Why PE?

Post by acm_beginner » Tue Oct 14, 2003 5:20 pm

I know this is a very extremely easy problem... I get Accepted but PE. I suppose that reading character by character and only change " to `` or '' would be enough.
Someone can tell me what's wrong with this code?

[cpp]
#include <iostream>

using namespace std;

int main(void) {
char c;
bool flag;

flag=true;
while (cin) {
cin.read(&c,1);
if (c=='"') {
if(flag) {
cout << "``";
} else {
cout << "''";
}
flag=!flag;
} else
cout << c;
}
return 0;
}
[/cpp]

Joseph Kurniawan
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Location: Jakarta, Indonesia

Post by Joseph Kurniawan » Wed Oct 15, 2003 5:12 am

try adding a newline character right after the last character;
instead of :
[cpp]
return 0;
[/cpp]

try
[cpp]
cout<<endl;
return 0;
[/cpp]

Hope it helps!! :wink: :wink: :wink:
There are 3 things one need to be successful : motivation, ability and chance. And if you're a believer, make it four : God's will.

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