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Compile Error

photo_nyoi.cpp: In function ‘int32_t main()’:
photo_nyoi.cpp:78:30: error: no matching function for call to ‘max(std::unordered_map<long long int, long long int>::mapped_type&)’
78 | id.se=max(mx[vect[id.se]]);
| ^
In file included from /usr/include/c++/9/bits/char_traits.h:39,
from /usr/include/c++/9/ios:40,
from /usr/include/c++/9/ostream:38,
from /usr/include/c++/9/iostream:39,
from photo_nyoi.cpp:4:
/usr/include/c++/9/bits/stl_algobase.h:222:5: note: candidate: ‘template<class _Tp> constexpr const _Tp& std::max(const _Tp&, const _Tp&)’
222 | max(const _Tp& __a, const _Tp& __b)
| ^~~
/usr/include/c++/9/bits/stl_algobase.h:222:5: note: template argument deduction/substitution failed:
photo_nyoi.cpp:78:30: note: candidate expects 2 arguments, 1 provided
78 | id.se=max(mx[vect[id.se]]);
|