Compilare: user.cpp: In function 'int verif(int)': user.cpp:48: warning: comparison between signed and unsigned integer expressions user.cpp:60: warning: comparison between signed and unsigned integer expressions user.cpp:68: warning: comparison between signed and unsigned integer expressions user.cpp: In function 'void DFS(int)': user.cpp:94: warning: unused variable 'p' user.cpp:94: warning: unused variable 'q' user.cpp: In function 'int main()': user.cpp:165: warning: unused variable 'j' user.cpp: In function 'void DFS(int)': user.cpp:105: warning: 'last' may be used uninitialized in this function