two dimensional array via pointer

Question

I would like to create a dynamic array which store permutation sequence, such that

order[0][]={1,2,3}
order[1][]={2,1,3}
order[2][]={2,3,1}

Answer 1

Emulating a 2D array with pointer arrays is a complete overkill if you have C99 (or C11). Just use

void permute(size_t num_permute, size_t num_term, unsigned order[][num_term]);

as your function signature and allocate your matrix in main with something like

unsigned (*order)[m] = malloc(sizeof(unsigned[n][m]));

Also, as you can see in the examples above, I'd suggest that you use the semantically correct types. Sizes are always best served with size_t and your permutation values look to me as if they will never be negative. Maybe for these you also should start counting from 0.