Language: C++

#include <bits/stdc++.h> 
using namespace std; 
int main() 
{
int n,W; 
cin>>n>>W;
vector<unsigned short int>v(n),w(n);
vector<unsigned short int> first(W+1,0),second(W+1,0);
for(int i=0; i<n; i++) cin>>w[i]>>v[i];
for(int i=0; i<n; i++){ for(int k=0; k<=W; k++) second[k]=first[k]; for(int k=0; k<=W; k++) if (k<w[i]) first[k]=second[k]; else first[k]=max(second[k-w[i]]+v[i],second[k]); 
                      }//DEBUG: for(int i=0; i<=n; i++){ for(int k=0; k<=W; k++) cout<<dp[i][k]<<" "; cout<<endl; }
cout<<first[W];
return 0; 
} 


Compiler output:
a.cc: In function 'int main()':
a.cc:10:142: error: no matching function for call to 'max(int, __gnu_cxx::__alloc_traits<std::allocator<short unsigned int>, short unsigned int>::value_type&)'
   10 | for(int i=0; i<n; i++){ for(int k=0; k<=W; k++) second[k]=first[k]; for(int k=0; k<=W; k++) if (k<w[i]) first[k]=second[k]; else first[k]=max(second[k-w[i]]+v[i],second[k]);
      |                                                                                                                                           ~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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:10:142: note:   deduced conflicting types for parameter 'const _Tp' ('int' and '__gnu_cxx::__alloc_traits<std::allocator<short unsigned int>, short unsigned int>::value_type' {aka 'short unsigned int'})
   10 | for(int i=0; i<n; i++){ for(int k=0; k<=W; k++) second[k]=first[k]; for(int k=0; k<=W; k++) if (k<w[i]) first[k]=second[k]; else first[k]=max(second[k-w[i]]+v[i],second[k]);
      |                                                                                                                                           ~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/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:10:142: note:   mismatched types 'std::initializer_list<_Tp>' and 'int'
   10 | for(int i=0; i<n; i++){ for(int k=0; k<=W; k++) second[k]=first[k]; for(int k=0; k<=W; k++) if (k<w[i]) first[k]=second[k]; else first[k]=max(second[k-w[i]]+v[i],second[k]);
      |                                                                                                                                           ~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~