Compilare: user.cpp: In function ‘int main()’: user.cpp:15: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result user.cpp: In function ‘long long int next5(long long int)’: user.cpp:142: warning: control reaches end of non-void function user.cpp: In function ‘long long int next3(long long int)’: user.cpp:99: warning: control reaches end of non-void function