/in/foo.cc: In function 'int dfs2(int, int)':
/in/foo.cc:54:42: warning: suggest parentheses around '+' inside '<<' [-Wparentheses]
   for (int i=(*rec)+(maxdep[cur]-dep[cur]+1<<1);i>(*rec);i--) rec[i]=tmp,tmp=gnd[tmp][0];  //?  //
                      ~~~~~~~~~~~~~~~~~~~~^~
/in/foo.cc:55:32: warning: suggest parentheses around '+' inside '<<' [-Wparentheses]
   (*rec)+=(maxdep[cur]-dep[cur]+1<<1);  //?
            ~~~~~~~~~~~~~~~~~~~~^~