road_construction.cpp: In function 'bool check(long long int)':
road_construction.cpp:55:39: error: no match for 'operator=' (operand types are 'std::unordered_map<long long int, std::unordered_map<long long int, long long int> >' and 'std::map<long long int, std::map<long long int, long long int> >')
55 | fenwick = map<int, map<int, int>>();
| ^
In file included from /usr/include/c++/10/unordered_map:47,
from /usr/include/c++/10/functional:61,
from /usr/include/c++/10/pstl/glue_algorithm_defs.h:13,
from /usr/include/c++/10/algorithm:74,
from /usr/include/x86_64-linux-gnu/c++/10/bits/stdc++.h:65,
from road_construction.cpp:1:
/usr/include/c++/10/bits/unordered_map.h:271:7: note: candidate: 'std::unordered_map<_Key, _Tp, _Hash, _Pred, _Alloc>& std::unordered_map<_Key, _Tp, _Hash, _Pred, _Alloc>::operator=(const std::unordered_map<_Key, _Tp, _Hash, _Pred, _Alloc>&) [with _Key = long long int; _Tp = std::unordered_map<long long int, long long int>; _Hash = std::hash<long long int>; _Pred = std::equal_to<long long int>; _Alloc = std::allocator<std::pair<const long long int, std::unordered_map<long long int, long long int> > >]'
271 | operator=(const unordered_map&) = default;
| ^~~~~~~~
/usr/include/c++/10/bits/unordered_map.h:271:17: note: no known conversion for argument 1 from 'std::map<long long int, std::map<long long int, long long int> >' to 'const std::unordered_map<long long int, std::unordered_map<long long int, long long int> >&'
271 | operator=(const unordered_map&) = default;
| ^~~~~~~~~~~~~~~~~~~~
/usr/include/c++/10/bits/unordered_map.h:275:7: note: candidate: 'std::unordered_map<_Key, _Tp, _Hash, _Pred, _Alloc>& std::unordered_map<_Key, _Tp, _Hash, _Pred, _Alloc>::operator=(std::unordered_map<_Key, _Tp, _Hash, _Pred, _Alloc>&&) [with _Key = long long int; _Tp = std::unordered_map<long long int, long long int>; _Hash = std::hash<long long int>; _Pred = std::equal_to<long long int>; _Alloc = std::allocator<std::pair<const long long int, std::unordered_map<long long int, long long int> > >]'
275 | operator=(unordered_map&&) = default;
| ^~~~~~~~
/usr/include/c++/10/bits/unordered_map.h:275:17: note: no known conversion for argument 1 from 'std::map<long long int, std::map<long long int, long long int> >' to 'std::unordered_map<long long int, std::unordered_map<long long int, long long int> >&&'
275 | operator=(unordered_map&&) = default;
| ^~~~~~~~~~~~~~~
/usr/include/c++/10/bits/unordered_map.h:289:7: note: candidate: 'std::unordered_map<_Key, _Tp, _Hash, _Pred, _Alloc>& std::unordered_map<_Key, _Tp, _Hash, _Pred, _Alloc>::operator=(std::initializer_list<typename std::_Hashtable<_Key, std::pair<const _Key, _Tp>, _Alloc, std::__detail::_Select1st, _Pred, _Hash, std::__detail::_Mod_range_hashing, std::__detail::_Default_ranged_hash, std::__detail::_Prime_rehash_policy, std::__detail::_Hashtable_traits<std::__not_<std::__and_<std::__is_fast_hash<_Hash>, std::__is_nothrow_invocable<const _Hash&, const _Key&> > >::value, false, true> >::value_type>) [with _Key = long long int; _Tp = std::unordered_map<long long int, long long int>; _Hash = std::hash<long long int>; _Pred = std::equal_to<long long int>; _Alloc = std::allocator<std::pair<const long long int, std::unordered_map<long long int, long long int> > >; typename std::_Hashtable<_Key, std::pair<const _Key, _Tp>, _Alloc, std::__detail::_Select1st, _Pred, _Hash, std::__detail::_Mod_range_hashing, std::__detail::_Default_ranged_hash, std::__detail::_Prime_rehash_policy, std::__detail::_Hashtable_traits<std::__not_<std::__and_<std::__is_fast_hash<_Hash>, std::__is_nothrow_invocable<const _Hash&, const _Key&> > >::value, false, true> >::value_type = std::pair<const long long int, std::unordered_map<long long int, long long int> >]'
289 | operator=(initializer_list<value_type> __l)
| ^~~~~~~~
/usr/include/c++/10/bits/unordered_map.h:289:46: note: no known conversion for argument 1 from 'std::map<long long int, std::map<long long int, long long int> >' to 'std::initializer_list<std::pair<const long long int, std::unordered_map<long long int, long long int> > >'
289 | operator=(initializer_list<value_type> __l)
| ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~