/in/foo.cc: In constructor 'Tree::Node::Node(int, int, Tree::Node*, Tree::Node*)':
/in/foo.cc:14:15: warning: 'Tree::Node::r' will be initialized after [-Wreorder]
         int l,r;
               ^
/in/foo.cc:13:15: warning:   'Tree::Node* Tree::Node::lson' [-Wreorder]
         Node *lson,*rson;
               ^~~~
/in/foo.cc:17:9: warning:   when initialized here [-Wreorder]
         Node(int l,int r,Node *lson,Node *rson):l(l),r(r),lson(lson),rson(rson){}
         ^~~~
/in/foo.cc: In member function 'void Tree::Node::query(int, int, int&, int&, int&, int&)':
/in/foo.cc:51:32: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
                 int mid=this->l+this->r>>1;
                         ~~~~~~~^~~~~~~~
/in/foo.cc: In member function 'Tree::Node* Tree::build(int, int)':
/in/foo.cc:89:43: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
         else return new Node(l,r,build(l,l+r>>1),build((l+r>>1)+1,r));
                                          ~^~
/in/foo.cc:89:58: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
         else return new Node(l,r,build(l,l+r>>1),build((l+r>>1)+1,r));
                                                         ~^~