arbore.cpp: In function 'void dfs(int)': arbore.cpp:22: warning: comparison between signed and unsigned integer expressions arbore.cpp:26: warning: comparison between signed and unsigned integer expressions arbore.cpp:31: warning: extended initializer lists only available with -std=c++0x or -std=gnu++0x arbore.cpp:31: warning: extended initializer lists only available with -std=c++0x or -std=gnu++0x arbore.cpp:36: warning: extended initializer lists only available with -std=c++0x or -std=gnu++0x arbore.cpp:36: warning: extended initializer lists only available with -std=c++0x or -std=gnu++0x