OJ Board

Posted: **Mon Jun 02, 2008 11:01 am**

amr saqr wrote:Actually, I'm having problems with understanding the problem description,
should i cut the matrix vertically or horizontally to make the comparison to check whether it's symmetric or not ????
sorry but I'm little confused here

and thanx in advance

No, you don't have to.
If the matrix is like:

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a b c d
e f g h
i j k l
m n o p

then you have to check;

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All the values are non-negative and a==p && b==o && c==n && ..

-----
Rio

Posted: **Mon Jun 02, 2008 12:31 pm**

Removed

Posted: **Sat Jun 21, 2008 2:55 pm**

Code: Select all

Code Acc!!!

Posted: **Sun Jun 22, 2008 8:52 am**

Hi Chirag Chheda,
I think you should remove this line

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system("pause");

And another thing, you should initialize f=false.

Posted: **Sun Jun 22, 2008 10:31 am**

Thank you sir for replying.
I made the changes suggested by you. But still i am getting WA.
And as far as system("pause") is concerned the judge dont give WA for that as in all my submissions
i send the code without removing it.

Waiting for your reply

Posted: **Mon Jun 23, 2008 5:42 am**

Look at the definition -

Definition: Symmetric matrix is such a matrix that all elements of it are non-negative and symmetric with relation to the center of this matrix. Any other matrix is considered to be non-symmetric.

Please ensure all the things of this definition.

Posted: **Mon Jun 23, 2008 7:41 am**

Thank you sir..
finally i managed to get an ACC

Posted: **Wed Jul 02, 2008 12:51 pm**

But can someone explain why i am RTE.

>>my code is posted above.

Posted: **Wed Jul 02, 2008 2:16 pm**

Can u tell me y r u printing this line???

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printf("N = ");

I think that's shud be in the input part and not the output part.

change it to:-

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scanf("%c%c",&c,&c);

declare 'c' to be of char data type

Posted: **Wed Jul 02, 2008 2:37 pm**

Thank you very much. I always make such stupid mistake

.
I never thought i should be inputed and getting RTE.

Again thank you for quick reply.

Posted: **Sun Jul 20, 2008 6:29 pm**

I think the problem statement is unclear:

Elements of this matrix are Mij: {0 < i < n, 0 < j < n}.

It should be Mij: {1 <= i <= n, 1 <= j <= n}.

Posted: **Tue Jun 30, 2009 12:56 pm**

#include <stdio.h>

int main ()
{
int num_test, k, n, i, j, flag;
long long a[110][110];
char junk;

scanf ("%d", &num_test);
k = 0;

NEXT_CASE:
while (k++ < num_test)
{
fflush (stdin);
scanf ("%c %c %d", &junk, &junk, &n);
flag = 0;
for (i = 0;i < n; i ++)
{
for (j = 0;j < n;j ++)
{
scanf("%lld", &a[j]);
if (a[j] < 0)
{
printf ("Test #%d: Non-symmetric.\n", k);
flag = 1;
}
}
}

if (flag)
{
continue;
}

for (i = 0;i < n/2; i ++)
{
for (j = 0;j < n;j ++)
{
if (a[j] != a[n - i - 1][n - j - 1])
{
printf ("Test #%d: Non-symmetric.\n", k);
goto NEXT_CASE;
}
}
}

for (j = 0;j < n/2; j ++)
{
for (i = 0;i < n;i ++)
{
if (a[j] != a[n - i - 1][n - j - 1])
{
printf ("Test #%d: Non-symmetric.\n", k);
goto NEXT_CASE;
}
}
}
printf ("Test #%d: Symmetric.\n", k);
}
return 0;
}

Can someone please let me know what is wrong in the above code...I am getting RTE

Posted: **Fri Jul 03, 2009 1:18 am**

U need to read the input carefully.
suppose input is like

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1
N = 3

first, u r taking 1 with

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scanf ("%d", &num_test);

that is okay.
then u r using

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scanf ("%c %c %d", &junk, &junk, &n);

Can u tell what will be the valu of junk and n here?
junk='\n'
junk='N'
n=garbage........

u can use this

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scanf("\nN = %d",&n);

or

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scanf(" N = %d",&n);

Posted: **Tue Jul 07, 2009 11:05 am**

@kbr_iut :
I have used fflush(stdin) before the statement scanf ("%c %c %d", &junk, &junk, &n); So the new line character would be flushed and n will have the value 3 for the input you have mentioned. Am I correct?

Posted: **Tue Jul 07, 2009 5:58 pm**

I just copied ur code and run for sample input of this problem and ur code gives

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Test #1: Symmetric.
Test #2: Symmetric.

and try to use code tag to post codes.

OJ Board

11349 - Symmetric Matrix

Re: 11349 - Symmetric Matrix

Re: 11349 - Symmetric Matrix

Why WA?????[:(]....its killing me

Re: 11349 - Symmetric Matrix

Re: 11349 - Symmetric Matrix

Re: 11349 - Symmetric Matrix

Re: 11349 - Symmetric Matrix

Re: 11349 - Symmetric Matrix

Re: 11349 - Symmetric Matrix

Re: 11349 - Symmetric Matrix

Re: 11349 - Symmetric Matrix

Re: 11349 - Symmetric Matrix

Re: 11349 - Symmetric Matrix

Re: 11349 - Symmetric Matrix

Re: 11349 - Symmetric Matrix