Compilare: user.cpp: In function ‘void Solve()’: user.cpp:35:17: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(; it <= xorsum; it <<= 1 ) ^ user.cpp: In function ‘void Read()’: user.cpp:12:20: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &n); ^ user.cpp:14:27: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &V[i]); ^ user.cpp: In function ‘void Solve()’: user.cpp:45:20: warning: ‘maxbit’ may be used uninitialized in this function [-Wmaybe-uninitialized] if( maxbit & V[i] ) ^