Compilare: main.cpp:1:2: warning: #import is a deprecated GCC extension [-Wdeprecated] #import<fstream> ^~~~~~ main.cpp:2:16: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type] int a,n,s;main(){std::fstream f("clasic.in");std::ofstream g("clasic.out");f>>n;for(;f>>n;g<<s<<'\n')for(s=0;n--;s^=a)f>>a;} ^