Language: C++

#include <bits/stdc++.h>
#define INF (1<<30)
#define MOD 1000000007
#define l_ength size
using ll = long long;
using namespace std;

int dp[110][100001];

int main(){
	int n, wmax;
	cin >> n >> wmax;
	vector<ll> w(n);
	vector<ll> v(n);
	for( int i = 0; i < n; ++i ) cin >> w[i] >> v[i];

	for( int i = 0; i <= n; ++i ){
		for( int j = 0; j <= wmax; ++j ){
			dp[i+1][j] = dp[i][j];
			if( ( j - w[i] == 0 ) || ( j - w[i] > 0 && dp[i][j-w[i]] > 0 ) ){
				dp[i+1][j] = max( dp[i][j], dp[i][j-w[i]] + v[i] );
			}
		}
	}
	ll ans = 0;
	for( int i = 0; i <= n; ++i ){
		for( int j = 0; j <= wmax; ++j ){
			ll = max(ans, dp[i][j]);
		}
	}
	cout << ans << endl;
	return 0;
}
// 12:46

Compiler output:
a.cc: In function 'int main()':
a.cc:21:49: error: no matching function for call to 'max(int&, __gnu_cxx::__alloc_traits<std::allocator<long long int>, long long int>::value_type)'
   21 |                                 dp[i+1][j] = max( dp[i][j], dp[i][j-w[i]] + v[i] );
      |                                              ~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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:21:49: note:   deduced conflicting types for parameter 'const _Tp' ('int' and '__gnu_cxx::__alloc_traits<std::allocator<long long int>, long long int>::value_type' {aka 'long long int'})
   21 |                                 dp[i+1][j] = max( dp[i][j], dp[i][j-w[i]] + v[i] );
      |                                              ~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/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:21:49: note:   mismatched types 'std::initializer_list<_Tp>' and 'int'
   21 |                                 dp[i+1][j] = max( dp[i][j], dp[i][j-w[i]] + v[i] );
      |                                              ~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
a.cc:28:28: error: expected unqualified-id before '=' token
   28 |                         ll = max(ans, dp[i][j]);
      |                            ^