Compilare: user.c: In function ‘main’: user.c:5:34: warning: unused variable ‘x’ [-Wunused-variable] long long n, k, j, m, i, cn, x; ^ user.c:5:30: warning: variable ‘cn’ set but not used [-Wunused-but-set-variable] long long n, k, j, m, i, cn, x; ^ user.c:9:11: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%lld", &n); ^