Compilare: user.cpp: In function ‘int main()’: user.cpp:18:53: warning: unused variable ‘dif’ [-Wunused-variable] long long n, a, b, x, ans = 0, nrab = 0, nra = 0, dif, aux; ^ user.cpp:15:23: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f, "%lld", &t); ^ user.cpp:19:42: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f, "%lld %lld %lld", &n, &a, &b); ^ user.cpp:28:25: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f, "%lld", &x); ^