printf("\n Fill 20 000 elements, with keys being the number of element\n");
printf(" (a point is 1 000 elements)\n");
for (j=0;j<NB_ELM;j++) {
printf("\n Fill 20 000 elements, with keys being the number of element\n");
printf(" (a point is 1 000 elements)\n");
for (j=0;j<NB_ELM;j++) {