Compilare: user.cpp:1:2: warning: #import is a deprecated GCC extension [-Wdeprecated] #import<fstream> ^~~~~~ user.cpp:2:6: warning: ISO C++ forbids declaration of ‘main’ with no type [-Wreturn-type] main(){for(int64_t N,P=!!std::ifstream("fetite.in")>>N;P<N;std::ofstream("fetite.out")<<N+N-(P+=P)+1);} ^ user.cpp: In function ‘int main()’: user.cpp:2:52: warning: ‘N’ is used uninitialized in this function [-Wuninitialized] main(){for(int64_t N,P=!!std::ifstream("fetite.in")>>N;P<N;std::ofstream("fetite.out")<<N+N-(P+=P)+1);} ~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~