Compilare: user.c: In function ‘main’: user.c:7:15: warning: unused variable ‘mm’ [-Wunused-variable] long sk = 0, mm = 0,n,k,r,c; ^ user.c:7:7: warning: unused variable ‘sk’ [-Wunused-variable] long sk = 0, mm = 0,n,k,r,c; ^ user.c:12:8: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f, "%d", &t); ^ user.c:14:9: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f, "%ld %ld", &n, &k); ^