Language: C++

#include <bits/stdc++.h>
using namespace std;
#define IOS ios::sync_with_stdio(false); cin.tie(0);
#define FOR(i,s,n) for(int i = s; i < (n); i++)
#define REP(i,n) FOR(i,0,n)
#define ALL(n) (n).begin(), (n).end()
#define RALL(n) (n).rbegin(), (n).rend()
#define ATYN(n) cout << ( (n) ? "Yes":"No") << '\n';
#define CFYN(n) cout << ( (n) ? "YES":"NO") << '\n';
#define OUT(n) cout << (n) << '\n';
using ll = long long;
using ull = unsigned long long;
using pii = pair<int,int>;
using pll = pair<ll,ll>;

int main(void)
{
    IOS
    ll n, w;
    cin >> n >> w;
    vector<ll> vv(n) , vw(n);
    REP(i,n) cin >> vw[i] >> vv[i];
    int w1 = vw[0];
    int ans = 0;

    vector<vector<vector<int>>> dp(n+1,vector<vector<int>>(n+1,vector<int>(n*3)));

    REP(i,n) for(int j = i; j>=0;j--) for(int k = j*3;k >= 0;k--) {
        //cerr << "dp" << i << j << k << endl;
        if (w1 * j + k + vw[i] <= w) {
            //cerr << i << " " << j << " " << k + vw[i] - w1 << " " << w1 * j + k + vw[i] << " " << dp[i][j][k] + vv[i]<< endl;
            dp[i+1][j+1][k + vw[i] - w1] = max(dp[i+1][j+1][k + vw[i] - w1], dp[i][j][k] + vv[i]);
            ans = max(ans,dp[i+1][j+1][k + vw[i] - w1]);
        }
        //cerr << i << " "<< j << " " << k << " "<< dp[i][j][k] << endl;
        dp[i+1][j][k] = dp[i][j][k];
    }

    cout << ans << '\n';

    return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:32:47: error: no matching function for call to 'max(__gnu_cxx::__alloc_traits<std::allocator<int>, int>::value_type&, __gnu_cxx::__alloc_traits<std::allocator<long long int>, long long int>::value_type)'
   32 |             dp[i+1][j+1][k + vw[i] - w1] = max(dp[i+1][j+1][k + vw[i] - w1], dp[i][j][k] + vv[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:32:47: 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'})
   32 |             dp[i+1][j+1][k + vw[i] - w1] = max(dp[i+1][j+1][k + vw[i] - w1], dp[i][j][k] + vv[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:32:47: note:   mismatched types 'std::initializer_list<_Tp>' and 'int'
   32 |             dp[i+1][j+1][k + vw[i] - w1] = max(dp[i+1][j+1][k + vw[i] - w1], dp[i][j][k] + vv[i]);
      |                                            ~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~