judete.cpp: In function 'void dfs(int)': judete.cpp:23: warning: 'auto' will change meaning in C++0x; please remove it judete.cpp:23: error: expected initializer before ':' token judete.cpp:31: error: expected primary-expression before 'if' judete.cpp:31: error: expected ';' before 'if' judete.cpp:31: error: expected primary-expression before 'if' judete.cpp:31: error: expected ')' before 'if'