Eroare de compilare: main.cpp: In function 'void go_visit(int, int, int)': main.cpp:25:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<nod[pos].size();i++) ~^~~~~~~~~~~~~~~~ In file included from /usr/include/c++/6/bits/hashtable.h:35:0, from /usr/include/c++/6/unordered_map:47, from /usr/include/x86_64-linux-gnu/c++/6/bits/stdc++.h:117, from main.cpp:1: /usr/include/c++/6/bits/hashtable_policy.h: In instantiation of 'struct std::__detail::__is_noexcept_hash<std::pair<int, int>, std::hash<std::pair<int, int> > >': /usr/include/c++/6/type_traits:143:12: required from 'struct std::__and_<std::__is_fast_hash<std::hash<std::pair<int, int> > >, std::__detail::__is_noexcept_hash<std::pair<int, int>, std::hash<std::pair<int, int> > > >' /usr/include/c++/6/type_traits:154:38: required from 'struct std::__not_<std::__and_<std::__is_fast_hash<std::hash<std::pair<int, int> > >, std::__detail::__is_noexcept_hash<std::pair<int, int>, std::hash<std::pair<int, int> > > > >' /usr/include/c++/6/bits/unordered_map.h:100:66: required from 'class std::unordered_map<std::pair<int, int>, bool>' main.cpp:36:42: required from here /usr/include/c++/6/bits/hashtable_policy.h:85:34: error: no match for call to '(const std::hash<std::pair<int, int> >) (const std::pair<int, int>&)' noexcept(declval<const _Hash&>()(declval<const _Key&>()))> ~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~ In file included from /usr/include/c++/6/bits/move.h:57:0, from /usr/include/c++/6/bits/nested_exception.h:40, from /usr/include/c++/6/exception:171, from /usr/include/c++/6/ios:39, from /usr/include/c++/6/istream:38, from /usr/include/c++/6/sstream:38, from /usr/include/c++/6/complex:45, from /usr/include/c++/6/ccomplex:39, from /usr/include/x86_64-linux-gnu/c++/6/bits/stdc++.h:52, from main.cpp:1: /usr/include/c++/6/type_traits: In instantiation of 'struct std::__not_<std::__and_<std::__is_fast_hash<std::hash<std::pair<int, int> > >, std::__detail::__is_noexcept_hash<std::pair<int, int>, std::hash<std::pair<int, int> > > > >': /usr/include/c++/6/bits/unordered_map.h:100:66: required from 'class std::unordered_map<std::pair<int, int>, bool>' main.cpp:36:42: required from here /usr/include/c++/6/type_traits:154:38: error: 'value' is not a member of 'std::__and_<std::__is_fast_hash<std::hash<std::pair<int, int> > >, std::__detail::__is_noexcept_hash<std::pair<int, int>, std::hash<std::pair<int, int> > > >' : public integral_constant<bool, !_Pp::value> ^~~~ In file included from /usr/include/c++/6/unordered_map:48:0, from /usr/include/x86_64-linux-gnu/c++/6/bits/stdc++.h:117, from main.cpp:1: /usr/include/c++/6/bits/unordered_map.h: In instantiation of 'class std::unordered_map<std::pair<int, int>, bool>': main.cpp:36:42: required from here /usr/include/c++/6/bits/unordered_map.h:100:66: error: 'value' is not a member of 'std::__not_<std::__and_<std::__is_fast_hash<std::hash<std::pair<int, int> > >, std::__detail::__is_noexcept_hash<std::pair<int, int>, std::hash<std::pair<int, int> > > > >' typedef __umap_hashtable<_Key, _Tp, _Hash, _Pred, _Alloc> _Hashtable; ^~~~~~~~~~ /usr/include/c++/6/bits/unordered_map.h:107:45: error: 'value' is not a member of 'std::__not_<std::__and_<std::__is_fast_hash<std::hash<std::pair<int, int> > >, std::__detail::__is_noexcept_hash<std::pair<int, int>, std::hash<std::pair<int, int> > > > >' typedef typename _Hashtable::key_type key_type; ^~~~~~~~ /usr/include/c++/6/bits/unordered_map.h:108:47: error: 'value' is not a member of 'std::__not_<std::__and_<std::__is_fast_hash<std::hash<std::pair<int, int> > >, std::__detail::__is_noexcept_hash<std::pair<int, int>, std::hash<std::pair<int, int> > > > >' typedef typename _Hashtable::value_type value_type; ^~~~~~~~~~ /usr/include/c++/6/bits/unordered_map.h:109:48: error: 'value' is not a member of 'std::__not_<std::__and_<std::__is_fast_hash<std::hash<std::pair<int, int> > >, std::__detail::__is_noexcept_hash<std::pair<int, int>, std::hash<std::pair<int, int> > > > >' typedef typename _Hashtable::mapped_type mapped_type; ^~~~~~~~~~~ /usr/include/c++/6/bits/unordered_map.h:110:43: error: 'value' is not a member of 'std::__not_<std::__and_<std::__is_fast_hash<std::hash<std::pair<int, int> > >, std::__detail::__is_noexcept_hash<std::pair<int, int>, std::hash<std::pair<int, int> > > > >' Non zero exit status: 1