Compilare: user.cpp: In function ‘void dfs_verif(int)’: user.cpp:51: warning: comparison between signed and unsigned integer expressions user.cpp: In function ‘void euler(int)’: user.cpp:65: warning: comparison between signed and unsigned integer expressions user.cpp: In function ‘void tipar()’: user.cpp:93: warning: comparison between signed and unsigned integer expressions user.cpp: In function ‘bool verif()’: user.cpp:47: warning: control reaches end of non-void function