Compilare: main.cpp:1:2: warning: #import is a deprecated GCC extension [-Wdeprecated] #import <fstream> ^~~~~~ main.cpp:3:6: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type] main() ^ main.cpp: In function 'int main()': main.cpp:12:28: warning: 'R' may be used uninitialized in this function [-Wmaybe-uninitialized] for(c >> N; N--; R ^= x) c >> x; ~~^~~~