Language: C++

#include <bits/stdc++.h>

#ifdef NON_SUBMIT
#define TEST(n) (n)
#else
#define TEST(n) ((void)0)
#endif

using namespace std;

int D[3000][3000];

int main()
{
	ios::sync_with_stdio(false);
	cin.tie(NULL); cout.tie(NULL);
	TEST(freopen("input.txt", "r", stdin));
	TEST(freopen("output.txt", "w", stdout));
	TEST(freopen("debug.txt", "w", stderr));
	string s, t;
	cin>>s>>t;
	D[0][0]=s[0]==t[0];
	for(int j=1;j<t.size();j++) D[0][j]=max(D[0][j-1],s[0]==t[j]);
	for(int i=1;i<s.size();i++) {
		D[i][0]=max(D[i-1][0],s[i]==t[0]);
		for(int j=1;j<t.size();j++) {
			D[i][j]=max(max(D[i-1][j],D[i][j-1]),D[i-1][j-1]+(s[i]==t[j]));
		}
	}
	cout<<D[s.size()-1][t.size()-1]<<'\n';
	return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:23:48: error: no matching function for call to 'max(int&, bool)'
   23 |         for(int j=1;j<t.size();j++) D[0][j]=max(D[0][j-1],s[0]==t[j]);
      |                                             ~~~^~~~~~~~~~~~~~~~~~~~~~
In file included from /usr/include/c++/14/algorithm:60,
                 from /usr/include/x86_64-linux-gnu/c++/14/bits/stdc++.h:51,
                 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:23:48: note:   deduced conflicting types for parameter 'const _Tp' ('int' and 'bool')
   23 |         for(int j=1;j<t.size();j++) D[0][j]=max(D[0][j-1],s[0]==t[j]);
      |                                             ~~~^~~~~~~~~~~~~~~~~~~~~~
/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:
/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:23:48: note:   mismatched types 'std::initializer_list<_Tp>' and 'int'
   23 |         for(int j=1;j<t.size();j++) D[0][j]=max(D[0][j-1],s[0]==t[j]);
      |                                             ~~~^~~~~~~~~~~~~~~~~~~~~~
a.cc:25:28: error: no matching function for call to 'max(int&, bool)'
   25 |                 D[i][0]=max(D[i-1][0],s[i]==t[0]);
      |                         ~~~^~~~~~~~~~~~~~~~~~~~~~
/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:25:28: note:   deduced conflicting types for parameter 'const _Tp' ('int' and 'bool')
   25 |                 D[i][0]=max(D[i-1][0],s[i]==t[0]);
      |                         ~~~^~~~~~~~~~~~~~~~~~~~~~
/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
/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:25:28: note:   mismatched types 'std::initializer_list<_Tp>' and 'int'
   25 |                 D[i][0]=max(D[i-1][0],s[i]==t[0]);
      |                         ~~~^~~~~~~~~~~~~~~~~~~~~~