/in/foo.cc: In function 'int dfs2(int, int)':
/in/foo.cc:55:39: warning: suggest parentheses around '+' inside '<<' [-Wparentheses]
   for (int i=(*rec)+(dep[res]-dep[cur]+1<<1);i>(*rec);i--) /*printf("rev add %d\n",tmp),*/  rec[i]=tmp,tmp=fat[tmp];  //fat[rt]=0,fat[0]=0
                      ~~~~~~~~~~~~~~~~~^~
/in/foo.cc:56:29: warning: suggest parentheses around '+' inside '<<' [-Wparentheses]
   (*rec)+=(dep[res]-dep[cur]+1<<1);// printf("test %d\n",dep[res]-dep[cur]+1);
            ~~~~~~~~~~~~~~~~~^~