Compilare: user.cpp: In function ‘int main()’: user.cpp:16:13: warning: unused variable ‘aux’ [-Wunused-variable] i64 a, b, aux, ans; ^ user.cpp:21:22: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f, "%d", &n); ^ user.cpp:23:34: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f, "%lld%lld", &a, &b); ^ user.cpp:16:18: warning: ‘ans’ may be used uninitialized in this function [-Wmaybe-uninitialized] i64 a, b, aux, ans; ^