SIGSEGV error on codechef?

My code for problem code ROWCOLOP or http://ww2.codechef.com/status/ROWCOLOP is:

#include<stdio.h>
#include<string.h>
int main()
{
    long n,q;
    scanf("%ld %ld",&n,&q);
    char op[6];
    long long mat[n][n];
    int k,l;
    for(k=0;k<n;k++)
                    for(l=0;l<n;l++)
                                    mat[k][l]=0;
    int x;
    long r,c,o;
    int i;
    for(i=0;i<q;i++)
    {
                    scanf("%s %ld %d",op,&o,&x);
                    if(strcmp("RowAdd",op))
                    {                       r=o;
                                            int j;
                                            for(j=0;j<n;j++)
                                                            mat[r][j]+=x;
                    }
                    else if(strcmp("ColAdd",op))
                    {                            c=o;
                                                 int j;
                                                 for(j=0;j<n;j++)
                                                            mat[j][c]+=x;
                    }  
    }                
    long max=mat[0][0];
    for(k=0;k<n;k++)
                    for(l=0;l<n;l++)
                                    if(mat[k][l]>max)
                                                     max=mat[k][l];
    printf("%ld",max);
    for(k=0;k<n;k++)
    { 
                    for(l=0;l<n;l++)
                                    printf("%ld ",mat[k][l]);
                    printf("\n");
    }
    return 0;
}  

I am able to run this program successfully on DevC++ on my PC, but on codechef it is giving a run-time error of SIGSEGV. Please help me to locate the problem.

From FAQ (http://ww2.codechef.com/wiki/faq#Why_do_I_get_a_SIGSEGV ):

Make sure you aren’t declaring too much memory. 64 MB is guaranteed, but having an array of size [10000][10000] will never work.

and you are trying to create array 314159 x 314159.

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