/in/foo.cc: In function 'void Build(node*, const int&, const int&, const int&)':
/in/foo.cc:42:11: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
  int mid=l+r>>1;
          ~^~
/in/foo.cc: In function 'void Change(node*, const int&, const int&, const int&, const int&)':
/in/foo.cc:48:16: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
  int mid=t[x].l+t[x].r>>1;
          ~~~~~~^~~~~~~
/in/foo.cc: In function 'long long int Query(node*, const int&, const int&, const int&)':
/in/foo.cc:54:16: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
  int mid=t[x].l+t[x].r>>1;
          ~~~~~~^~~~~~~