Language: C++

#include <iostream>
#include <vector>
#include <string>
#include <algorithm>
#include <unordered_map>
#include <array>

using namespace std;

#define ll long long
#define all(v) v.begin(),v.end()
#define bootstrap ios_base::sync_with_stdio(false), cin.tie(0), cout.tie(0);

vector<pair<long, long>> getFurthest(vector<pair<long, long>> &kvs) {
    long max = 0;
    long dis;
    vector<pair<long, long>> ret;
    for (int i = 1; i < kvs.size(); ++i) {
        for (int j = 0; j < i; ++j) {
            dis = abs(kvs[i].first - kvs[j].first) + abs(kvs[i].second - kvs[j].second);
            if (dis == max) {
                ret.push_back(kvs[i]);
                ret.push_back(kvs[j]);
            }
            if (dis > max) {
                max = dis;
                ret.clear();
                ret.push_back(kvs[i]);
                ret.push_back(kvs[j]);
            }
        }
    }
    return ret;
}

void solve() {
    // quantization
    long num;
    cin >> num;
    unordered_multimap<pair<long, long>, pair<long, long>> kvs;
    // maybe need recursive
    long q = 100000;
    long x, y;
    for (int i = 0; i < num; i++) {
        cin >> x >> y;
        kvs.emplace(pair<long, long>(x / q, y / q), pair(x, y));
    }
    vector<pair<long, long>> keys;
    for (auto&[k, v]: kvs) {
        keys.push_back(k);
    }
    auto candidates = getFurthest(keys);
    vector<pair<long, long>> data;
    for (const auto &key: keys) {
        auto its = kvs.equal_range(key):
        for_each(its.first, its.second, [&data](
                pair<const pair<long, long>, pair<long, long>> datum) { data.push_back(datum.second); })
    }
    auto res = getFurthest(data);
    cout << abs(res[0].first - res[1].first) + abs(res[0].second - res[1].second);
}


int main() {
    bootstrap
    solve();
}


Compiler output:
a.cc: In function 'void solve()':
a.cc:40:60: error: use of deleted function 'std::unordered_multimap<_Key, _Tp, _Hash, _Pred, _Alloc>::unordered_multimap() [with _Key = std::pair<long int, long int>; _Tp = std::pair<long int, long int>; _Hash = std::hash<std::pair<long int, long int> >; _Pred = std::equal_to<std::pair<long int, long int> >; _Alloc = std::allocator<std::pair<const std::pair<long int, long int>, std::pair<long int, long int> > >]'
   40 |     unordered_multimap<pair<long, long>, pair<long, long>> kvs;
      |                                                            ^~~
In file included from /usr/include/c++/14/unordered_map:41,
                 from a.cc:5:
/usr/include/c++/14/bits/unordered_map.h:1293:7: note: 'std::unordered_multimap<_Key, _Tp, _Hash, _Pred, _Alloc>::unordered_multimap() [with _Key = std::pair<long int, long int>; _Tp = std::pair<long int, long int>; _Hash = std::hash<std::pair<long int, long int> >; _Pred = std::equal_to<std::pair<long int, long int> >; _Alloc = std::allocator<std::pair<const std::pair<long int, long int>, std::pair<long int, long int> > >]' is implicitly deleted because the default definition would be ill-formed:
 1293 |       unordered_multimap() = default;
      |       ^~~~~~~~~~~~~~~~~~
/usr/include/c++/14/bits/unordered_map.h: At global scope:
/usr/include/c++/14/bits/unordered_map.h:1293:7: error: use of deleted function 'std::_Hashtable<_Key, _Value, _Alloc, _ExtractKey, _Equal, _Hash, _RangeHash, _Unused, _RehashPolicy, _Traits>::_Hashtable() [with _Key = std::pair<long int, long int>; _Value = std::pair<const std::pair<long int, long int>, std::pair<long int, long int> >; _Alloc = std::allocator<std::pair<const std::pair<long int, long int>, std::pair<long int, long int> > >; _ExtractKey = std::__detail::_Select1st; _Equal = std::equal_to<std::pair<long int, long int> >; _Hash = std::hash<std::pair<long int, long int> >; _RangeHash = std::__detail::_Mod_range_hashing; _Unused = std::__detail::_Default_ranged_hash; _RehashPolicy = std::__detail::_Prime_rehash_policy; _Traits = std::__detail::_Hashtable_traits<true, false, false>]'
In file included from /usr/include/c++/14/bits/unordered_map.h:33:
/usr/include/c++/14/bits/hashtable.h:539:7: note: 'std::_Hashtable<_Key, _Value, _Alloc, _ExtractKey, _Equal, _Hash, _RangeHash, _Unused, _RehashPolicy, _Traits>::_Hashtable() [with _Key = std::pair<long int, long int>; _Value = std::pair<const std::pair<long int, long int>, std::pair<long int, long int> >; _Alloc = std::allocator<std::pair<const std::pair<long int, long int>, std::pair<long int, long int> > >; _ExtractKey = std::__detail::_Select1st; _Equal = std::equal_to<std::pair<long int, long int> >; _Hash = std::hash<std::pair<long int, long int> >; _RangeHash = std::__detail::_Mod_range_hashing; _Unused = std::__detail::_Default_ranged_hash; _RehashPolicy = std::__detail::_Prime_rehash_policy; _Traits = std::__detail::_Hashtable_traits<true, false, false>]' is implicitly deleted because the default definition would be ill-formed:
  539 |       _Hashtable() = default;
      |       ^~~~~~~~~~
/usr/include/c++/14/bits/hashtable.h:539:7: error: use of deleted function 'std::__detail::_Hashtable_base<_Key, _Value, _ExtractKey, _Equal, _Hash, _RangeHash, _Unused, _Traits>::_Hashtable_base() [with _Key = std::pair<long int, long int>; _Value = std::pair<const std::pair<long int, long int>, std::pair<long int, long int> >; _ExtractKey = std::__detail::_Select1st; _Equal = std::equal_to<std::pair<long int, long int> >; _Hash = std::hash<std::pair<long int, long int> >; _RangeHash = std::__detail::_Mod_range_hashing; _Unused = std::__detail::_Default_ranged_hash; _Traits = std::__detail::_Hashtable_traits<true, false, false>]'
In file included from /usr/include/c++/14/bits/hashtable.h:35:
/usr/include/c++/14/bits/hashtable_policy.h:1731:7: note: 'std::__detail::_Hashtable_base<_Key, _Value, _ExtractKey, _Equal, _Hash, _RangeHash, _Unused, _Traits>::_Hashtable_base() [with _Key = std::pair<long int, long int>; _Value = std::pair<const std::pair<long int, long int>, std::pair<long int, long int> >; _ExtractKey = std::__detail::_Select1st; _Equal = std::equal_to<std::pair<long int, long int> >; _Hash = std::hash<std::pair<long int, long int> >; _RangeHash = std::__detail::_Mod_range_hashing; _Unused = std::__detail::_Default_ranged_hash; _Traits = std::__detail::_Hashtable_traits<true, false, false>]' is implicitly deleted because the default definition would be ill-formed:
 1731 |       _Hashtable_base() = default;
      |       ^~~~~~~~~~~~~~~
/usr/include/c++/14/bits/hashtable_policy.h:1731:7: error: use of deleted function 'std::__detail::_Hash_code_base<_Key, _Value, _ExtractKey, _Hash, _RangeHash, _Unused, __cache_hash_code>::_Hash_code_base() [with _Key = std::pair<long int, long int>; _Value = std::pair<const std::pair<long int, long int>, std::pair<long int, long int> >; _ExtractKey = std::__detail::_Select1st; _Hash = std::hash<std::pair<long int, long int> >; _RangeHash = std::__detail::_Mod_range_hashing; _Unused = std::__detail::_Default_ranged_hash; bool __cache_hash_code = true]'
/usr/include/c++/14/bits/hashtable_policy.h: In instantiation of 'std::__detail::_Hashtable_ebo_helper<_Nm, _Tp, true>::_Hashtable_ebo_helper() [with int _Nm = 1; _Tp = std::hash<std::pair<long int, long int> >]':
/usr/include/c++/14/bits/hashtable_policy.h:1328:7:   required from here
 1328 |       _Hash_code_base() = default;
      |       ^~~~~~~~~~~~~~~
/usr/include/c++/14/bits/hashtable_policy.h:1245:49: error: use of deleted function 'std::hash<std::pair<long int, long int> >::hash()'
 1245 |       _Hashtable_ebo_helper() noexcept(noexcept(_Tp())) : _Tp() { }
      |                                                 ^~~~~
In file included from /usr/include/c++/14/string_view:50,
                 from /usr/include/c++/14/bits/basic_string.h:47,
                 from /usr/include/c++/14/string:54,
                 from /usr/include/c++/14/bits/locale_classes.h:40,
                 from /usr/include/c++/14/bits/ios_base.h:41,
                 from /usr/include/c++/14/ios:44,
                 from /usr/include/c++/14/ostream:40,
                 from /usr/include/c++/14/iostream:41,
                 from a.cc:1:
/usr/include/c++/14/bits/functional_hash.h:102:12: note: 'std::hash<std::pair<long int, long int> >::hash()' is implicitly deleted because the default definition would be ill-formed:
  102 |     struct hash : __hash_enum<_Tp>
      |            ^~~~
/usr/include/c++/14/bits/functional_hash.h:102:12: error: no matching function for call to 'std::__hash_enum<std::pair<long int, long int>, false>::__hash_enum()'
/usr/include/c++/14/bits/functional_hash.h:83:7: note: candidate: 'std::__hash_enum<_Tp, <anonymous> >::__hash_enum(std::__hash_enum<_Tp, <anonymous> >&&) [with _Tp = std::pair<long int, long int>; bool <anonymous> = false]'
   83 |       __hash_enum(__hash_enum&&);
      |       ^~~~~~~~~~~
/usr/include/c++/14/bits/functional_hash.h:83:7: note:   candidate expects 1 argument, 0 provided
/usr/include/c++/14/bits/functional_hash.h:102:12: error: 'std::__hash_enum<_Tp, <anonymous> >::~__hash_enum() [with _Tp = std::pair<long int, long int>; bool <anonymous> = false]' is private within this context
  102 |     struct hash : __hash_enum<_Tp>
      |            ^~~~
/usr/include/c++/14/bits/functional_hash.h:84:7: note: declared private here
   84 |       ~__hash_enum();
      |       ^
/usr/include/c++/14/bits/hashtable_policy.h:1245:49: note: use '-fdiagnostics-all-candidates' to display considered candidates
 1245 |       _Hashtable_ebo_helper() noexcept(noexcept(_Tp())) : _Tp() { }
      |                                                 ^~~~~
/usr/include/c++/14/bits/hashtable_policy.h:1328:7: note: 'std::__detail::_Hash_code_base<_Key, _Value, _ExtractKey, _Hash, _RangeHash, _Unused, __cache_hash_code>::_Hash_code_base() [with _Key = std::pair<long int, long int>; _Value = std::pair<const std::pair<long int, long int>, std::pair<long int, long int> >; _ExtractKey = std::__detail::_Select1st; _Hash = std::hash<std::pair<long int, long int> >; _RangeHash = std::__detail::_Mod_range_hashing; _Unused = std::__detail::_Default_ranged_hash; bool __cache_hash_code = true]' is implicitly deleted because the default definition would be ill-formed:
 1328 |       _Hash_code_base() = default;
      |       ^~~~~~~~~~~~~~~
/usr/include/c++/14/bits/hashtable_policy.h:1328:7: error: use of deleted function 'std::__detail::_Hashtable_ebo_helper<1, std::hash<std::pair<long int, long int> >, true>::~_Hashtable_ebo_helper()'
/usr/include/c++/14/bits/hashtable_policy.h:1242:12: note: 'std::__detail::_Hashtable_ebo_helper<1, std::hash<std::pair<long int, long int> >, true>::~_Hashtable_ebo_helper()' is implicitly deleted because the default definition would be ill-formed:
 1242 |     struct _Hashtable_ebo_helper<_Nm, _Tp, true>
      |            ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/usr/include/c++/14/bits/hashtable_policy.h:1242:12: error: use of deleted function 'std::hash<std::pair<long int, long int> >::~hash()'
/usr/include/c++/14/bits/functional_hash.h:102:12: note: 'std::hash<std::pair<long int, long int> >::~hash()' is implicitly deleted because the default definition would be ill-formed:
  102 |     struct hash : __hash_enum<_Tp>
      |            ^~~~
/usr/include/c++/14/bits/functional_hash.h:102:12: error: 'std::__hash_enum<_Tp, <anonymous> >::~__hash_enum() [with _Tp = std::pair<long int, long int>; bool <anonymous> = false]' is private within this context
/usr/include/c++/14/bits/functional_hash.h:84:7: note: declared private here
   84 |       ~__hash_enum();
      |       ^
/usr/include/c++/14/bits/hashtable_policy.h:1731:7: note: use '-fdiagnostics-all-candidates' to display considered candidates
 1731 |       _Hashtable_base() = default;
      |       ^~~~~~~~~~~~~~~
/usr/include/c++/14/bits/hashtable_policy.h:1731:7: error: use of deleted function 'std::__detail::_Hash_code_base<std::pair<long int, long int>, std::pair<const std::pair<long int, long int>, std::pair<long int, long int> >, std::__detail::_Select1st, std::hash<std::pair<long int, long int> >, std::__detail::_Mod_range_hashing,