Cub 3d (matrice 3d) cu un singur pointer

#include <conio.h>
#include <stdio.h>
#include <stdlib.h>
// pointer program.  creeaza o matrice cu un singur for

void CitireAfisare(int *p, int n, int m, int sect) {
    int *init;
    init = p;
    int lungime = n*m;
    int k;
    // am un vector -> matrice k -> (i,j) k/coloana, k%coloana
    for (k = 0; k < sect; k++)
        for (int i = 0; i < lungime; i++) {

            printf("matrice[%d][%d][%d]= ", k, i / m, i%m);
            scanf_s("%d", p);
            p++;
        }
    int i;
    p = init; // 1 2 3 4 5 6 7 8 9
    printf("\nAfisare matrice 3D:\n");
    for (k = 0; k < sect; k++) {
        for (i = 0; i < lungime; i++) {
            if (i%m == 0) {
                printf("\n");
                for (int x = 0; x < k; x++)
                    printf(" ");
            }
            printf("%d ", *p);
            p++;
        }

    }

}

int * Alocare(int n, int m, int sect) {

    int *p;
    int lungime = n*m*sect;
    if ((p = (int *)malloc(sizeof(int)*lungime)) == NULL) { // ( (p=)==NULL)
        printf("nu s-a gasit in memorie");
        _getch();
        exit(0);
    }
    return p;
}

void main() {
    int *p;
    int n, m, sect, lungime;

    printf("Introduceti nr de sectiuni: ");
    scanf_s("%d", &sect);
    printf("Introduceti nr de linii ale matricei: ");
    scanf_s("%d", &n);
    printf("Introduceti nr de coloane ale matricei:");
    scanf_s("%d", &m);
    lungime = n*m;

    p = Alocare(n, m, sect);
    CitireAfisare(p, n, m, sect);



    _getch();
}