Language: C++

#include<iostream>
#include<string>
using namespace std;
#define M 1046527
#define NIL (-1)
#define L 14

char H[M][L];

// ??????????????°????????????
int getChar(char ch){
    if(ch == 'A') return 1;
    else if(ch == 'B') return 2;
    else if(ch == 'C') return 3;
    else if(ch == 'D') return 4;
    else return 0;
}
// ?????????????????°??????????????????key?????????
long long getKey(char str[]){
    long long sum = 0, p = 1;
    for(int i = 0; i < strlen(str); i++){
        sum += p*(getChar(str[i]));
        p *= 5;
    }
    return sum;
}

int h1(int key){
    return key % M;
}
int h2(int key){
    return 1 + (key % (M-1));
}

int find(char str[]){
    long long key, i, h;
    key = getKey(str);
    for(int i = 0;; i++){
        h = (h1(key) + i*h2(key)) % M;
        if(strcmp(H[h],str) == 0)
            return 1;
        else if(strlen(H[h]) == 0)
            return 0;
    }
}

int insert(char str[]){
    long long key, i, h;
    key = getKey(str);
    for(int i = 0;; i++){
        h = (h1(key) + i*h2(key)) % M;
        if(strcmp(H[h],str) == 0)
            return 1;
        else if(strlen(H[h]) == 0){
            strcpy(H[h], str);
            return 0;
        }
    }
}
int main(){
    int n;
    char command, str;
    cin >> n;
    while(n--){
        cin >> command >> str;
        if(command[0] == 'i'){
            insert(str);
        }else if(command[0] == 'f'){
            if(find(str))
                cout << "YES" << endl;
            else
                cout << "NO" < endl;
        }
    }
}

Compiler output:
a.cc: In function 'long long int getKey(char*)':
a.cc:21:24: error: 'strlen' was not declared in this scope
   21 |     for(int i = 0; i < strlen(str); i++){
      |                        ^~~~~~
a.cc:2:1: note: 'strlen' is defined in header '<cstring>'; this is probably fixable by adding '#include <cstring>'
    1 | #include<iostream>
  +++ |+#include <cstring>
    2 | #include<string>
a.cc: In function 'int find(char*)':
a.cc:40:12: error: 'strcmp' was not declared in this scope
   40 |         if(strcmp(H[h],str) == 0)
      |            ^~~~~~
a.cc:40:12: note: 'strcmp' is defined in header '<cstring>'; this is probably fixable by adding '#include <cstring>'
a.cc:42:17: error: 'strlen' was not declared in this scope
   42 |         else if(strlen(H[h]) == 0)
      |                 ^~~~~~
a.cc:42:17: note: 'strlen' is defined in header '<cstring>'; this is probably fixable by adding '#include <cstring>'
a.cc: In function 'int insert(char*)':
a.cc:52:12: error: 'strcmp' was not declared in this scope
   52 |         if(strcmp(H[h],str) == 0)
      |            ^~~~~~
a.cc:52:12: note: 'strcmp' is defined in header '<cstring>'; this is probably fixable by adding '#include <cstring>'
a.cc:54:17: error: 'strlen' was not declared in this scope
   54 |         else if(strlen(H[h]) == 0){
      |                 ^~~~~~
a.cc:54:17: note: 'strlen' is defined in header '<cstring>'; this is probably fixable by adding '#include <cstring>'
a.cc:55:13: error: 'strcpy' was not declared in this scope
   55 |             strcpy(H[h], str);
      |             ^~~~~~
a.cc:55:13: note: 'strcpy' is defined in header '<cstring>'; this is probably fixable by adding '#include <cstring>'
a.cc: In function 'int main()':
a.cc:66:19: error: invalid types 'char[int]' for array subscript
   66 |         if(command[0] == 'i'){
      |                   ^
a.cc:67:20: error: invalid conversion from 'char' to 'char*' [-fpermissive]
   67 |             insert(str);
      |                    ^~~
      |                    |
      |                    char
a.cc:47:17: note:   initializing argument 1 of 'int insert(char*)'
   47 | int insert(char str[]){
      |            ~~~~~^~~~~
a.cc:68:25: error: invalid types 'char[int]' for array subscript
   68 |         }else if(command[0] == 'f'){
      |                         ^
a.cc:69:20: error: no matching function for call to 'find(char&)'
   69 |             if(find(str))
      |                ~~~~^~~~~
a.cc:35:5: note: candidate: 'int find(char*)' (near match)
   35 | int find(char str[]){
      |     ^~~~
a.cc:35:5: note:   conversion of argument 1 would be ill-formed:
a.cc:69:21: error: invalid conversion from 'char' to 'char*' [-fpermissive]
   69 |             if(find(str))
      |                     ^~~
      |                     |
      |                     char
In file included from /usr/include/c++/14/bits/locale_facets.h:48,
                 from /usr/include/c++/14/bits/basic_ios.h:37,
                 from /usr/include/c++/14/ios:46,
                 from /usr/include/c++/14/ostream:40,
                 from /usr/include/c++/14/iostream:41,
                 from a.cc:1:
/usr/include/c++/14/bits/streambuf_iterator.h:435:5: note: candidate: 'template<class _CharT2> typename __gnu_cxx::__enable_if<std::__is_char<_CharT2>::__value, std::istreambuf_iterator<_CharT> >::__type std::find(istreambuf_iterator<_CharT>, istreambuf_iterator<_CharT>, const _CharT2&)'
  435 |     find(istreambuf_iterator<_CharT> __first,
      |     ^~~~
/usr/include/c++/14/bits/streambuf_iterator.h:435:5: note:   candidate expects 3 arguments, 1 provided
a.cc:72:30: error: no match for 'operator<' (operand types are 'std::basic_ostream<char>' and '<unresolved overloaded function type>')
   72 |                 cout << "NO" < endl;
      |                 ~~~~~~~~~~~~~^~~~~~
In file included from /usr/include/c++/14/string:48,
                 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:
/usr/include/c++/14/bits/stl_iterator.h:448:5: note: candidate: 'template<class _Iterator> constexpr bool std::operator<(const reverse_iterator<_Iterator>&, const reverse_iterator<_Iterator>&)'
  448 |     operator<(const reverse_iterator<_Iterator>& __x,
      |     ^~~~~~~~
/usr/include/c++/14/bits/stl_iterator.h:448:5: note:   template argument deduction/substitution failed:
a.cc:72:32: note:   'std::basic_ostream<char>' is not derived from 'const std::reverse_iterator<_Iterator>'
   72 |                 cout << "NO" < endl;
      |                                ^~~~
/usr/include/c++/14/bits/stl_iterator.h:493:5: note: candidate: 'template<class _IteratorL, class _IteratorR> constexpr bool std::operator<(const reverse_iterator<_Iterator>&, const reverse_iterator<_IteratorR>&)'
  493 |     operator<(const reverse_iterator<_IteratorL>& __x,
      |     ^~~~~~~~
/usr/include/c++/14/bits/stl_iterator.h:493:5: note:   template argument deduction/substitution failed:
a.cc:72:32: note:   'std::basic_ostream<char>' is not derived from 'const std::reverse_iterator<_Iterator>'
   72 |                 cout << "NO" < endl;
      |                                ^~~~
/usr/include/c++/14/bits/stl_iterator.h:1694:5: note: candidate: 'template<class _IteratorL, class _IteratorR> constexpr bool std::operator<(const move_iterator<_IteratorL>&, const move_iterator<_IteratorR>&)'
 1694 |     operator<(const move_iterator<_IteratorL>& __x,
      |     ^~~~~~~~
/usr/include/c++/14/bits/stl_iterator.h:1694:5: note:   template argument deduction/substitution failed:
a.cc:72:32: note:   'std::basic_ostream<char>' is not derived from 'const std::move_iterator<_IteratorL>'
   72 |                 cout << "NO" < endl;
      |                                ^~~~
/usr/include/c++/14/bits/stl_iterator.h:1760:5: note: candidate: 'template<class _Iterator> constexpr bool std::operator<(const move_iterator<_IteratorL>&, const move_iterator<_IteratorL>&)'
 1760 |     operator<(const move_iterator<_Iterator>& __x,
      |     ^~~~~~~~
/usr/include/c++/14/bits/stl_iterator.h:1760:5: note:   template argument deduction/substitution failed:
a.cc:72:32: note:   'std::basic_ostream<char>' is not derived from 'const std::move_iterator<_IteratorL>'
   72 |                 cout << "NO" < endl;
      |                                ^~~~
In file included from /usr/include/c++/14/bits/stl_algobase.h:64,
                 from /usr/include/c++/14/string:51:
/usr/include/c++/14/bits/stl_pair.h:1045:5: note: candidate: 'template<class _T1, class _T2> constexpr bool std::operator<(const pair<_T1, _T2>&, const pair<_T1, _T2>&)'
 1045 |     operator<(const pair<_T1, _T2>& __x, const pair<_T1, _T2>& __y)
      |     ^~~~~~~~
/usr/include/c++/14/bits/stl_pair.h:1045:5: note:   template argument deduction/substitution failed:
a.cc:72:32: note:   'std::basic_ostream<char>' is not derived from 'const std::pair<_T1, _T2>'
   72 |                 cout << "NO" < endl;
      |                                ^~~~
In file included from /usr/include/c++/14/bits/basic_string.h:47,
                 from /usr/include/c++/14/string:54:
/usr/include/c++/14/string_view:673:5: note: candidate: 'template<class _CharT, class _Traits> constexpr bool std::operator<(basic_string_view<_CharT, _Traits>, basic_string_view<_CharT, _Traits>)'
  673 |     operator< (basic_string_view<_CharT, _Traits> __x,
      |     ^~~~~~~~
/usr/include/c++/14/string_view:673:5: note:   template argument deduction/substitution failed:
a.cc:72:32: note:   'std::basic_ostream<char>' is not derived from 'std::basic_string_view<_CharT, _Traits>'
   72 |                 cout << "NO" < endl;
      |                                ^~~~
/usr/include/c++/14/string_view:680:5: note: candidate: 'template<class _CharT, class _Traits> constexpr bool std::operator<(basic_string_view<_CharT, _Traits>, __type_identity_t<basic_string_view<_CharT, _Traits> >)'
  680 |     operator< (basic_string_view<_CharT, _Traits> __x,
      |     ^~~~~~~~
/usr/include/c++/14/string_view:680:5: note:   template argument deduction/substitution failed:
a.cc:72:32: note:   'std::basic_ostream<char>' is not derived from 'std::basic_string_view<_CharT, _Traits>'
   72 |                 cout << "NO" < endl;
      |                                ^~~~
/usr/include/c++/14/string_view:688:5: note: candidate: 'template<class _CharT, class _Traits> constexpr bool std::operator<(__type_identity_t<basic_string_view<_CharT, _Traits> >, basic_string_view<_CharT, _Traits>)'
  688 |     operator< (__type_identity_t<basic_string_view<_CharT, _Traits>> __x,
      |     ^~~~~~~~
/usr/include/c++/14/string_view:688:5: note:   template argument deduction/substitution failed:
a.cc:72:32: note:   couldn't deduce template parameter '_CharT'
   72 |                 cout << "NO" < endl;
      |                                ^~~~
/usr/include/c++/14/bits/basic_string.h:3874:5: note: candidate: 'template<class _CharT, class _Traits, class _Alloc> bool std::operator<(const __cxx11::basic_string<_CharT, _Traits, _Allocator>&, const __cxx11::basic_string<_CharT, _Traits, _Allocator>&)'
 3874 |     operator<(const basic_string<_CharT, _Traits, _Alloc>& __lhs,
      |     ^~~~~~~~
/usr/include/c++/14/bits/basic_string.h:3874:5: note:   template argument deduction/substitution failed:
a.cc:72:32: note:   'std::basic_ostream<char>' is not derived from 'const std::__cxx11::basic_string<_CharT, _Traits, _Allocator>'
   72 |                 cout << "NO" < endl;
      |                                ^~~~
/usr/include/c++/14/bits/basic_string.h:3888:5: note: candidate: 'template<class _CharT, class _Traits, class _Alloc> bool std::operator<(const __cxx11::basic_string<_CharT, _Traits, _Allocator>&, const _CharT*)'
 3888 |     operator<(const basic_string<_CharT, _Traits, _Alloc>& __lhs,
      |     ^~~~~~~~
/usr/include/c++/14/bits/basic_string.h:3888:5: note:   template argument deduction/substitution failed:
a.cc:72:32: note:   'std::basic_ostream<char>' is not derived from 'const std::__cxx11::basic_string<_CharT, _Traits, _Allocator>'
   72 |                 cout << "NO" < endl;
      |