long int n,m;
              cin>>n>>m;
             long int a[n][m];
              a[0][0]=1;
              for(long int i=1;i<n;i++)
              a[i][0]=0;
              for(long int i=1;i<m;i++)
              a[0][i]=0;
               long int z=0;
              for(long int i=1;i<n;i++)
              {
                      for( long int j=1;j<m;j++)
                      {
                              a[i][j]=(j*(a[i-1][j]) + a[i-1][j-1] );
                              z=a[i][j];
                              }
                              }
                  int mod= z%2;
               cout<<mod<<endl;

m getting segmentation fault error at run time in the above code.
can any one explain segmentation fault and how to remove it??

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