Compilare: user.cpp: In function ‘void dfs_verif(int)’: user.cpp:52: warning: comparison between signed and unsigned integer expressions user.cpp: In function ‘void euler(int)’: user.cpp:66: warning: comparison between signed and unsigned integer expressions user.cpp: In function ‘void tipar()’: user.cpp:88: warning: comparison between signed and unsigned integer expressions user.cpp: In function ‘bool verif()’: user.cpp:48: warning: control reaches end of non-void function