Take into account these improvements. Additionally, provide any references to functions that were left out. ### Capacity - [ ] [empty](https://en.cppreference.com/w/cpp/container/unordered_map/empty) - [ ] [size](https://en.cppreference.com/w/cpp/container/unordered_map/size) ### Modifiers - [ ] [clear](https://en.cppreference.com/w/cpp/container/unordered_map/clear) - [ ] [insert](https://en.cppreference.com/w/cpp/container/unordered_map/insert) - [ ] [insert_or_assign](https://en.cppreference.com/w/cpp/container/unordered_map/insert_or_assign) - [ ] [erase](https://en.cppreference.com/w/cpp/container/unordered_map/erase) - [ ] [swap](https://en.cppreference.com/w/cpp/container/unordered_map/swap) - [ ] [extract](https://en.cppreference.com/w/cpp/container/unordered_map/extract) - [ ] [merge](https://en.cppreference.com/w/cpp/container/unordered_map/merge) ### Lookup - [ ] [count](https://en.cppreference.com/w/cpp/container/unordered_map/count) - [ ] [find](https://en.cppreference.com/w/cpp/container/unordered_map/find) - [ ] [contains](https://en.cppreference.com/w/cpp/container/unordered_map/contains) - [ ] [equal_range](https://en.cppreference.com/w/cpp/container/unordered_map/equal_range) ### Bucket interface - [ ] [bucket_count](https://en.cppreference.com/w/cpp/container/unordered_map/bucket_count) - [ ] [max_bucket_count](https://en.cppreference.com/w/cpp/container/unordered_map/max_bucket_count) - [ ] [bucket_size](https://en.cppreference.com/w/cpp/container/unordered_map/bucket_size) - [ ] [bucket](https://en.cppreference.com/w/cpp/container/unordered_map/bucket) ### Hash policy - [ ] [load_factor](https://en.cppreference.com/w/cpp/container/unordered_map/load_factor) - [ ] [max_load_factor](https://en.cppreference.com/w/cpp/container/unordered_map/max_load_factor) - [ ] [rehash](https://en.cppreference.com/w/cpp/container/unordered_map/rehash) - [ ] [reserve](https://en.cppreference.com/w/cpp/container/unordered_map/reserve) ### Observers - [ ] [hash_function](https://en.cppreference.com/w/cpp/container/unordered_map/hash_function) - [ ] [key_eq](https://en.cppreference.com/w/cpp/container/unordered_map/key_eq)