Compilare: user.cpp:1:2: warning: #import is a deprecated GCC extension [-Wdeprecated] #import<fstream> ^~~~~~ user.cpp:2:59: warning: ISO C++ forbids declaration of ‘main’ with no type [-Wreturn-type] std::ifstream f("nim.in");std::ofstream g("nim.out");main(){int N,x,S;for(f>>N;f>>N;g<<(S?"DA\n":"NU\n"))for(S=0;N--;S^=x)f>>x;} ^