arce.cpp: In function 'void input()': arce.cpp:31: warning: extended initializer lists only available with -std=c++0x or -std=gnu++0x arce.cpp:31: warning: extended initializer lists only available with -std=c++0x or -std=gnu++0x arce.cpp: In function 'bool dfs2(int, int)': arce.cpp:58: warning: extended initializer lists only available with -std=c++0x or -std=gnu++0x arce.cpp:58: warning: extended initializer lists only available with -std=c++0x or -std=gnu++0x arce.cpp:61: warning: extended initializer lists only available with -std=c++0x or -std=gnu++0x arce.cpp:61: warning: extended initializer lists only available with -std=c++0x or -std=gnu++0x arce.cpp:52: warning: unused variable 'to'