Language: C++

#include<bits/stdc++.h>

using namespace std;
using ll = long long;

class Rolling_Hash {
  private:
    ll n;
    static constexpr ll base1 = 1007, base2 = 2009;
    static constexpr ll mod1 = (1e9+7), mod2 = (1e9+9);
    vector<ll> hash1, hash2, mpow1, mpow2;
  public:
    Rolling_Hash(const string& s) {
        n=s.size();
        hash1.assign(n + 1, 0);
        hash2.assign(n + 1, 0);
        mpow1.assign(n + 1, 1);
        mpow2.assign(n + 1, 1);
        for(int i = 0; i < n; i++) {
            hash1[i + 1] = (hash1[i]*base1+s[i])%mod1;
            hash2[i + 1] = (hash2[i]*base2+s[i])%mod2;
            mpow1[i + 1] = (mpow1[i]*base1) % mod1;
            mpow2[i + 1] = (mpow2[i]*base2) % mod2;
        }
    }

    //get_hash [l, r)
    auto get(ll l, ll r) {
        ll lefval = hash1[r] - hash1[l]*mpow1[r-l]%mod1;
        ll rigval = hash2[r] - hash2[l]*mpow2[r-l]%mod2;
        if(lefval<0)lefval += mod1;
        if(rigval<0)rigval += mod2;
        return make_pair(lefval,rigval);
    }

    //最小共通接頭辞を求める
    auto get_LCP(ll a,ll b){
        ll len = min( n-a+1,n-b+1 );
        ll low=0,high=len;
        while( high-low>1 ){
            ll mid=(high+low)/2;
            if(get(a,a+mid)!=get(b,b+mid))high=mid;
            else low=mid;
        }
    return low;
    }
};


int main()
{
    int n; cin >> n;
    vector<string> s(n);
    for(int i = 0; i < n; i++)cin >> s[i];
    sort(s.begin(), s.end(), [](string& s, string& t){return s.size() > t.size();});
    unordered_map<pair<pair<ll,ll>,char>,int> mp;
    unordered_map<char,int> uni;
    ll ans = 0;

    for(int I = 0; I < n; I++) { //s[I]は減らして作られる側
        
        string t = s[I];
        int m = s[I].size();
        Rolling_Hash rh(t);

        //ask-part
        if(t.size() == 1)ans += uni[t[0]-'a'];
        ans += mp[{rh.get(1,m), t[0]-'a'}];
        
        //add-part
        vector<bool> alf(26);
        for(int i = 0; i < m; i++) {
            for(int j = 0; j < 26; j++) {
                if(alf[j])mp[{rh.get(i,m),j}]++;
                if(t[i]-'a' == j)alf[j]=true;
            }
        }
        for(int i = 0; i < 26; i++)if(alf[i])uni[i]++;
    }
    cout << ans << endl;

}

Compiler output:
a.cc: In function 'int main()':
a.cc:56:47: error: use of deleted function 'std::unordered_map<_Key, _Tp, _Hash, _Pred, _Alloc>::unordered_map() [with _Key = std::pair<std::pair<long long int, long long int>, char>; _Tp = int; _Hash = std::hash<std::pair<std::pair<long long int, long long int>, char> >; _Pred = std::equal_to<std::pair<std::pair<long long int, long long int>, char> >; _Alloc = std::allocator<std::pair<const std::pair<std::pair<long long int, long long int>, char>, int> >]'
   56 |     unordered_map<pair<pair<ll,ll>,char>,int> mp;
      |                                               ^~
In file included from /usr/include/c++/14/unordered_map:41,
                 from /usr/include/c++/14/functional:63,
                 from /usr/include/x86_64-linux-gnu/c++/14/bits/stdc++.h:53,
                 from a.cc:1:
/usr/include/c++/14/bits/unordered_map.h:148:7: note: 'std::unordered_map<_Key, _Tp, _Hash, _Pred, _Alloc>::unordered_map() [with _Key = std::pair<std::pair<long long int, long long int>, char>; _Tp = int; _Hash = std::hash<std::pair<std::pair<long long int, long long int>, char> >; _Pred = std::equal_to<std::pair<std::pair<long long int, long long int>, char> >; _Alloc = std::allocator<std::pair<const std::pair<std::pair<long long int, long long int>, char>, int> >]' is implicitly deleted because the default definition would be ill-formed:
  148 |       unordered_map() = default;
      |       ^~~~~~~~~~~~~
/usr/include/c++/14/bits/unordered_map.h: At global scope:
/usr/include/c++/14/bits/unordered_map.h:148:7: error: use of deleted function 'std::_Hashtable<_Key, _Value, _Alloc, _ExtractKey, _Equal, _Hash, _RangeHash, _Unused, _RehashPolicy, _Traits>::_Hashtable() [with _Key = std::pair<std::pair<long long int, long long int>, char>; _Value = std::pair<const std::pair<std::pair<long long int, long long int>, char>, int>; _Alloc = std::allocator<std::pair<const std::pair<std::pair<long long int, long long int>, char>, int> >; _ExtractKey = std::__detail::_Select1st; _Equal = std::equal_to<std::pair<std::pair<long long int, long long int>, char> >; _Hash = std::hash<std::pair<std::pair<long long int, long long int>, char> >; _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, true>]'
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<std::pair<long long int, long long int>, char>; _Value = std::pair<const std::pair<std::pair<long long int, long long int>, char>, int>; _Alloc = std::allocator<std::pair<const std::pair<std::pair<long long int, long long int>, char>, int> >; _ExtractKey = std::__detail::_Select1st; _Equal = std::equal_to<std::pair<std::pair<long long int, long long int>, char> >; _Hash = std::hash<std::pair<std::pair<long long int, long long int>, char> >; _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, true>]' 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<std::pair<long long int, long long int>, char>; _Value = std::pair<const std::pair<std::pair<long long int, long long int>, char>, int>; _ExtractKey = std::__detail::_Select1st; _Equal = std::equal_to<std::pair<std::pair<long long int, long long int>, char> >; _Hash = std::hash<std::pair<std::pair<long long int, long long int>, char> >; _RangeHash = std::__detail::_Mod_range_hashing; _Unused = std::__detail::_Default_ranged_hash; _Traits = std::__detail::_Hashtable_traits<true, false, true>]'
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<std::pair<long long int, long long int>, char>; _Value = std::pair<const std::pair<std::pair<long long int, long long int>, char>, int>; _ExtractKey = std::__detail::_Select1st; _Equal = std::equal_to<std::pair<std::pair<long long int, long long int>, char> >; _Hash = std::hash<std::pair<std::pair<long long int, long long int>, char> >; _RangeHash = std::__detail::_Mod_range_hashing; _Unused = std::__detail::_Default_ranged_hash; _Traits = std::__detail::_Hashtable_traits<true, false, true>]' 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<std::pair<long long int, long long int>, char>; _Value = std::pair<const std::pair<std::pair<long long int, long long int>, char>, int>; _ExtractKey = std::__detail::_Select1st; _Hash = std::hash<std::pair<std::pair<long long int, long long int>, char> >; _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<std::pair<long long int, long long int>, char> >]':
/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<std::pair<long long int, long long int>, char> >::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/bitset:52,
                 from /usr/include/x86_64-linux-gnu/c++/14/bits/stdc++.h:52:
/usr/include/c++/14/bits/functional_hash.h:102:12: note: 'std::hash<std::pair<std::pair<long long int, long long int>, char> >::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<std::pair<long long int, long long int>, char>, 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<std::pair<long long int, long long int>, char>; 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<std::pair<long long int, long long int>, char>; 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<std::pair<long long int, long long int>, char>; _Value = std::pair<const std::pair<std::pair<long long int, long long int>, char>, int>; _ExtractKey = std::__detail::_Select1st; _Hash = std::hash<std::pair<std::pair<long long int, long long int>, char> >; _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<std::pair<long long int, long long int>, char> >, 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<std::pair<long long int, long long int>, char> >, 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<std::pair<long long int, long long int>, char> >::~hash()'
/usr/include/c++/14/bits/functional_hash.h:102:12: note: 'std::hash<std::pair<std::pair<long long int, long long int>, char> >::~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<std::pair<long long int, long long int>,