/in/foo.cc: In function 'int main()':
/in/foo.cc:68:14: warning: suggest parentheses around comparison in operand of '&' [-Wparentheses]
     if(maxd&1==0)
             ~^~~
/in/foo.cc:77:14: warning: suggest parentheses around comparison in operand of '&' [-Wparentheses]
     if(maxd&1==0)
             ~^~~
/in/foo.cc: In function 'long long int dfs2(long long int, long long int)':
/in/foo.cc:36:1: warning: control reaches end of non-void function [-Wreturn-type]
 }
 ^