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(){int64_t N,P=1;for(std::ifstream("fetite.in")>>N;P<N;P+=P)std::ofstream("fetite.out")<<N+++N-P;} ^ user.cpp: In function ‘int main()’: user.cpp:2:95: warning: operation on ‘N’ may be undefined [-Wsequence-point] main(){int64_t N,P=1;for(std::ifstream("fetite.in")>>N;P<N;P+=P)std::ofstream("fetite.out")<<N+++N-P;} ~^~