Compilare: user.c: In function ‘quickSort’: user.c:9:5: warning: implicit declaration of function ‘rand’ [-Wimplicit-function-declaration] int aux, st=begin, dr=end, mid=st+rand()%(dr-st+1), px=a[v[mid]], py=b[v[mid]]; ^ user.c: In function ‘main’: user.c:31:11: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d%d%d", &n, &alfa, &omega); ^ user.c:35:15: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d%d", &a[i], &b[i]); ^