Compilare: user.cpp:38:6: warning: ISO C++ forbids declaration of ‘main’ with no type [-Wreturn-type] main() ^ user.cpp: In function ‘int main()’: user.cpp:55:49: warning: second operand of conditional expression has no effect [-Wunused-value] out << (find(x) == find(y)) ? "DA\n" : "NU\n"; ^ user.cpp:55:49: warning: third operand of conditional expression has no effect [-Wunused-value]