/in/foo.cc: In function 'void Build(int, int, int)':
/in/foo.cc:38:11: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
  int mid=l+r>>1,lc=now<<1,rc=now<<1|1;
          ~^~
/in/foo.cc: In function 'bool Modify(int, int, int, int)':
/in/foo.cc:52:11: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
  int mid=l+r>>1,lc=now<<1,rc=now<<1|1;
          ~^~