piloti.cpp: In function `int main()': piloti.cpp:24: no matching function for call to `std::multiset<int, std::less<int>, std::allocator<int> >::erase()' /usr/include/c++/3.2.2/bits/stl_multiset.h:169: candidates are: void std::multiset<_Key, _Compare, _Alloc>::erase(std::_Rb_tree<_Key, _Key, std::_Identity<_Key>, _Compare, _Alloc>::const_iterator) [with _Key = int, _Compare = std::less<int>, _Alloc = std::allocator<int>] /usr/include/c++/3.2.2/bits/stl_multiset.h:173: std::_Rb_tree<_Key, _Key, std::_Identity<_Key>, _Compare, _Alloc>::size_type std::multiset<_Key, _Compare, _Alloc>::erase(const _Key&) [with _Key = int, _Compare = std::less<int>, _Alloc = std::allocator<int>] /usr/include/c++/3.2.2/bits/stl_multiset.h:176: void std::multiset<_Key, _Compare, _Alloc>::erase(std::_Rb_tree<_Key, _Key, std::_Identity<_Key>, _Compare, _Alloc>::const_iterator, std::_Rb_tree<_Key, _Key, std::_Identity<_Key>, _Compare, _Alloc>::const_iterator) [with _Key = int, _Compare = std::less<int>, _Alloc = std::allocator<int>] piloti.cpp:25: parse error before `if'