GCC/bin/../lib/gcc/mingw32/3.4.2/../../../../include/c++/3.4.2/bits/stl_function.h: In member function `bool std::less<_Tp>::operator()(const _Tp&, const _Tp&) const [with _Tp = Node]':
GCC/bin/../lib/gcc/mingw32/3.4.2/../../../../include/c++/3.4.2/bits/stl_tree.h:1154: instantiated from `typename std::_Rb_tree<_Key, _Val, _KeyOfValue, _Compare, _Alloc>::iterator std::_Rb_tree<_Key, _Val, _KeyOfValue, _Compare, _Alloc>::lower_bound(const _Key&) [with _Key = Node, _Val = std::pair<const Node, Node>, _KeyOfValue = std::_Select1st<std::pair<const Node, Node> >, _Compare = std::less<Node>, _Alloc = std::allocator<std::pair<const Node, Node> >]'
GCC/bin/../lib/gcc/mingw32/3.4.2/../../../../include/c++/3.4.2/bits/stl_map.h:540: instantiated from `typename std::_Rb_tree<_Key, std::pair<const _Key, _Tp>, std::_Select1st<std::pair<const _Key, _Tp> >, _Compare, _Alloc>::iterator std::map<_Key, _Tp, _Compare, _Alloc>::lower_bound(const _Key&) [with _Key = Node, _Tp = Node, _Compare = std::less<Node>, _Alloc = std::allocator<std::pair<const Node, Node> >]'
GCC/bin/../lib/gcc/mingw32/3.4.2/../../../../include/c++/3.4.2/bits/stl_map.h:336: instantiated from `_Tp& std::map<_Key, _Tp, _Compare, _Alloc>::operator[](const _Key&) [with _Key = Node, _Tp = Node, _Compare = std::less<Node>, _Alloc = std::allocator<std::pair<const Node, Node> >]'
0_0_4019991_11985.cpp:23: instantiated from here
GCC/bin/../lib/gcc/mingw32/3.4.2/../../../../include/c++/3.4.2/bits/stl_function.h:227: error: no match for 'operator<' in '__x < __y'
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