Language: C++

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


using namespace std;


string dp[3001][3001];




int main()
{
	string s, t;

	cin >> s >> t;


  	for (int i = 0; i <= s.length(); i++) dp[i][0] = "";
    for (int i = 0; i <= t.length(); i++) dp[0][i] = "";


	for (int i = 1; i <= s.length(); i++) {
		for (int j = 1; j <= t.length(); j++) {



			string c = s.substr(i - 1, 1);

			if (s.substr(i - 1, 1) == t.substr(j - 1, 1)) {
				dp[i][j] = dp[i - 1][j - 1] + c;
			} else {
              	dp[i][j] = max(dp[i - 1][j], dp[i, j - 1]);
            }
		}
	}

	cout << dp[s.length()][t.length()] << endl;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:36:31: error: no matching function for call to 'max(std::string&, std::string [3001])'
   36 |                 dp[i][j] = max(dp[i - 1][j], dp[i, j - 1]);
      |                            ~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~
In file included from /usr/include/c++/14/string:51,
                 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/stl_algobase.h:257:5: note: candidate: 'template<class _Tp> constexpr const _Tp& std::max(const _Tp&, const _Tp&)'
  257 |     max(const _Tp& __a, const _Tp& __b)
      |     ^~~
/usr/include/c++/14/bits/stl_algobase.h:257:5: note:   template argument deduction/substitution failed:
a.cc:36:31: note:   deduced conflicting types for parameter 'const _Tp' ('std::__cxx11::basic_string<char>' and 'std::string [3001]' {aka 'std::__cxx11::basic_string<char> [3001]'})
   36 |                 dp[i][j] = max(dp[i - 1][j], dp[i, j - 1]);
      |                            ~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~
/usr/include/c++/14/bits/stl_algobase.h:303:5: note: candidate: 'template<class _Tp, class _Compare> constexpr const _Tp& std::max(const _Tp&, const _Tp&, _Compare)'
  303 |     max(const _Tp& __a, const _Tp& __b, _Compare __comp)
      |     ^~~
/usr/include/c++/14/bits/stl_algobase.h:303:5: note:   candidate expects 3 arguments, 2 provided
In file included from /usr/include/c++/14/algorithm:61,
                 from a.cc:3:
/usr/include/c++/14/bits/stl_algo.h:5706:5: note: candidate: 'template<class _Tp> constexpr _Tp std::max(initializer_list<_Tp>)'
 5706 |     max(initializer_list<_Tp> __l)
      |     ^~~
/usr/include/c++/14/bits/stl_algo.h:5706:5: note:   candidate expects 1 argument, 2 provided
/usr/include/c++/14/bits/stl_algo.h:5716:5: note: candidate: 'template<class _Tp, class _Compare> constexpr _Tp std::max(initializer_list<_Tp>, _Compare)'
 5716 |     max(initializer_list<_Tp> __l, _Compare __comp)
      |     ^~~
/usr/include/c++/14/bits/stl_algo.h:5716:5: note:   template argument deduction/substitution failed:
a.cc:36:31: note:   'std::__cxx11::basic_string<char>' is not derived from 'std::initializer_list<_Tp>'
   36 |                 dp[i][j] = max(dp[i - 1][j], dp[i, j - 1]);
      |                            ~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~