Compilare: user.c: In function ‘main’: user.c:36:5: warning: implicit declaration of function ‘qsort’ [-Wimplicit-function-declaration] qsort(real, n+m+1, sizeof(int), compare); ^ user.c:23:9: warning: unused variable ‘mx’ [-Wunused-variable] int mx=0; ^ user.c:21:27: warning: unused variable ‘y’ [-Wunused-variable] int n, m, i, j, p, x, y, s=0; ^ user.c:21:24: warning: unused variable ‘x’ [-Wunused-variable] int n, m, i, j, p, x, y, s=0; ^ user.c:24:5: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f1,"%d",&p); ^ user.c:25:5: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&n,&m); ^ user.c:27:9: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f1,"%d",&real[i]); ^ user.c:29:9: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f1,"%d",&uman[i]); ^ user.c:31:9: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f1,"%d%d",&priv_real[i],&priv_uman[i]); ^