Compilare: user.cpp: In function 'int verif(int)': user.cpp:43: warning: comparison between signed and unsigned integer expressions user.cpp:47: warning: comparison between signed and unsigned integer expressions user.cpp:67: warning: comparison between signed and unsigned integer expressions user.cpp: In function 'void DFS(int)': user.cpp:105: warning: comparison between signed and unsigned integer expressions user.cpp:108: warning: comparison between signed and unsigned integer expressions user.cpp:145: warning: comparison between signed and unsigned integer expressions user.cpp:86: warning: unused variable 'p' user.cpp:86: warning: unused variable 'q' user.cpp: In function 'int main()': user.cpp:159: warning: unused variable 'j' user.cpp: In function 'void DFS(int)': user.cpp:98: warning: 'last' may be used uninitialized in this function