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:10:43: warning: 'S' may be used uninitialized in this function [-Wmaybe-uninitialized] for(c >> i, c >> N; N--;c >> x, S ^= x) ~~^~~~