C - Can't print dynamic array values

this code:

for (contador = 0; contador < k; contador++)
{
    fscanf(f, " %d", q++);
}

will never be executed.

It is in a loop code block, where the driving force is 'flag' and flag is only set to 0 and 1, both the 0 case and the 1 case exit the overall 'for' loop.

Have you dumped the resulting 'p' array to assure the values are correct?

When running the program, did you notice that this code is never executed?

this code:

for (i = 0; i < *m; i++)
{
    printf("\n");
    for (j = 0; j < *n; j++)
    {
        printf("%d   ", p[j]);
        p++;
    }
}

has the problem that 'p' should not be incremented.
for two reasons:
1) need to keep pointer to malloc'd memory
2) the variable 'j' is indexing off of 'p' so no need to increment 'p'

the following code compiles, but does raise a compiler warning about unused paramter
the code implements the OPs requirements

#include <stdio.h>
#include <stdlib.h>

// the 'iter' parameter is not used, raises compiler warning,
// suggest adding code to use it or remove that parameter
int* init_dados(char *nome,int *m, int *n, int *iter)
{
    FILE *f = NULL;
    int *p = NULL; // ptr to malloc'd memory
    if( NULL == (p = malloc(1) ) )
    { // then, malloc failed
        perror( "malloc failed" );
        exit( EXIT_FAILURE );
    }

    // implied else, malloc successful

    int *q = p; // steps into malloc'd memory

    int j; // group loop index
    int k; // group data size
    int contador=0; // read loop counter
    int lixo=0;   // read and discard work area



    if(NULL == (f=fopen(nome, "r") ) )
    { // then, fopen failed
        perror("fopen failed" );
        printf("Erro no acesso ao ficheiro dos dados\n");
        exit( EXIT_FAILURE );
    }

    // implied else, fopen successful

    if( 2 != (fscanf(f, " %d %d", m,n) ) )
    { // then, fscanf failed
        perror( "fscanf failed for first line of file" );
        free(p);
        exit( EXIT_FAILURE );
    }

    // implied else, fscanf for m, n successful

    //se ainda nao leu nada
    for (contador = 0; contador < *n; contador++)
    {
        if( 1 != fscanf(f, " %d", &lixo) )
        { // then, fscanf failed for throwaway data
            perror("fscanf failed for throwaway data line" );
            free(p);
            exit( EXIT_FAILURE );
        }

        // implied else, fscanf successful
    } // end for


    // for each data group
    for (j = 0; j<(*n); j++)
    {
        if( 1 != fscanf(f, " %d", &k) )
        { // then, fscanf failed
            perror( "fscanf failed for count of data in group" );
            free(p);
            exit( EXIT_FAILURE );
        }

        // implied else, fscanf successful

        // input data from data group, with echo
        printf("\nGroup Number: %d with data count: %d\n", j, k);
        for (contador = 0; contador < k; contador++, q++)
        {
            if( 1 != fscanf(f, " %d", q) )
            { // then, fscanf failed
                perror( "fscanf failed for data entry in data group" );
                free(p);
                exit( EXIT_FAILURE );
            }

            // implied else, fscanf successful

            printf("%3d   ", *q);
        } // end for
    } // end for

    fclose(f);

    return p;
} // end function: init_dados