Compilare: user.cpp: In function ‘int main()’: user.cpp:19:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=dif; i<=pl; i++){ ^ user.cpp:10:42: warning: unused variable ‘n2’ [-Wunused-variable] unsigned long long int pl, mi, n1=1, n2=1, dif, k=2, x; ^ user.cpp:12:38: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%llu%llu", &pl, &mi); ^