road_construction.cpp: In function 'bool check(long long int)':
road_construction.cpp:54:59: error: no match for 'operator=' (operand types are 'std::map<long long int, std::map<long long int, long long int> >' and 'std::unordered_map<long long int, std::unordered_map<long long int, long long int> >')
54 | fenwick = unordered_map<int, unordered_map<int, int>>();
| ^
In file included from /usr/include/c++/10/map:61,
from /usr/include/x86_64-linux-gnu/c++/10/bits/stdc++.h:81,
from road_construction.cpp:1:
/usr/include/c++/10/bits/stl_map.h:319:7: note: candidate: 'std::map<_Key, _Tp, _Compare, _Alloc>& std::map<_Key, _Tp, _Compare, _Alloc>::operator=(const std::map<_Key, _Tp, _Compare, _Alloc>&) [with _Key = long long int; _Tp = std::map<long long int, long long int>; _Compare = std::less<long long int>; _Alloc = std::allocator<std::pair<const long long int, std::map<long long int, long long int> > >]'
319 | operator=(const map&) = default;
| ^~~~~~~~
/usr/include/c++/10/bits/stl_map.h:319:17: note: no known conversion for argument 1 from 'std::unordered_map<long long int, std::unordered_map<long long int, long long int> >' to 'const std::map<long long int, std::map<long long int, long long int> >&'
319 | operator=(const map&) = default;
| ^~~~~~~~~~
/usr/include/c++/10/bits/stl_map.h:323:7: note: candidate: 'std::map<_Key, _Tp, _Compare, _Alloc>& std::map<_Key, _Tp, _Compare, _Alloc>::operator=(std::map<_Key, _Tp, _Compare, _Alloc>&&) [with _Key = long long int; _Tp = std::map<long long int, long long int>; _Compare = std::less<long long int>; _Alloc = std::allocator<std::pair<const long long int, std::map<long long int, long long int> > >]'
323 | operator=(map&&) = default;
| ^~~~~~~~
/usr/include/c++/10/bits/stl_map.h:323:17: note: no known conversion for argument 1 from 'std::unordered_map<long long int, std::unordered_map<long long int, long long int> >' to 'std::map<long long int, std::map<long long int, long long int> >&&'
323 | operator=(map&&) = default;
| ^~~~~
/usr/include/c++/10/bits/stl_map.h:337:7: note: candidate: 'std::map<_Key, _Tp, _Compare, _Alloc>& std::map<_Key, _Tp, _Compare, _Alloc>::operator=(std::initializer_list<std::pair<const _Key, _Tp> >) [with _Key = long long int; _Tp = std::map<long long int, long long int>; _Compare = std::less<long long int>; _Alloc = std::allocator<std::pair<const long long int, std::map<long long int, long long int> > >]'
337 | operator=(initializer_list<value_type> __l)
| ^~~~~~~~
/usr/include/c++/10/bits/stl_map.h:337:46: note: no known conversion for argument 1 from 'std::unordered_map<long long int, std::unordered_map<long long int, long long int> >' to 'std::initializer_list<std::pair<const long long int, std::map<long long int, long long int> > >'
337 | operator=(initializer_list<value_type> __l)
| ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~