Compilare: user.cpp:59:2: warning: no newline at end of file user.cpp: In function 'int main()': user.cpp:27: warning: comparison between signed and unsigned integer expressions user.cpp:30: warning: comparison between signed and unsigned integer expressions user.cpp: In function 'int disj_all(int, int, int)': user.cpp:59: warning: control reaches end of non-void function