Language: C++

#include<bits/stdc++.h>
using namespace std;

struct item {
  int weight;
  int value;
};

int main() {
  int n, W;
  cin >> n >> W;
  
  item items[n+1], dp[n+1][W+1];
  memset(dp, 0, sizeof(dp));
  for(int i = 1; i <= n; i++) cin >> items[i].weight >> items[i].value;
  
  for(int i = 1; i <= n; i++) {
    int weight = items[i].weight;
    int value  = items[i].value;
    for(int j = 1; j <= W; j++) {
      int maxValue = j <= weight ? max(dp[i-1][j], dp[i-1][j-weight] + value) : 0;
      dp[i][j] = max(dp[i][j], maxValue);
    }
  }
  
  cout << dp[n][W];
  return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:21:70: error: no match for 'operator+' (operand types are 'item' and 'int')
   21 |       int maxValue = j <= weight ? max(dp[i-1][j], dp[i-1][j-weight] + value) : 0;
      |                                                    ~~~~~~~~~~~~~~~~~ ^ ~~~~~
      |                                                                    |   |
      |                                                                    |   int
      |                                                                    item
In file included from /usr/include/c++/14/bits/stl_algobase.h:67,
                 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_iterator.h:627:5: note: candidate: 'template<class _Iterator> constexpr std::reverse_iterator<_Iterator> std::operator+(typename reverse_iterator<_Iterator>::difference_type, const reverse_iterator<_Iterator>&)'
  627 |     operator+(typename reverse_iterator<_Iterator>::difference_type __n,
      |     ^~~~~~~~
/usr/include/c++/14/bits/stl_iterator.h:627:5: note:   template argument deduction/substitution failed:
a.cc:21:72: note:   mismatched types 'const std::reverse_iterator<_Iterator>' and 'int'
   21 |       int maxValue = j <= weight ? max(dp[i-1][j], dp[i-1][j-weight] + value) : 0;
      |                                                                        ^~~~~
/usr/include/c++/14/bits/stl_iterator.h:1798:5: note: candidate: 'template<class _Iterator> constexpr std::move_iterator<_IteratorL> std::operator+(typename move_iterator<_IteratorL>::difference_type, const move_iterator<_IteratorL>&)'
 1798 |     operator+(typename move_iterator<_Iterator>::difference_type __n,
      |     ^~~~~~~~
/usr/include/c++/14/bits/stl_iterator.h:1798:5: note:   template argument deduction/substitution failed:
a.cc:21:72: note:   mismatched types 'const std::move_iterator<_IteratorL>' and 'int'
   21 |       int maxValue = j <= weight ? max(dp[i-1][j], dp[i-1][j-weight] + value) : 0;
      |                                                                        ^~~~~
In file included from /usr/include/c++/14/string:54,
                 from /usr/include/c++/14/bitset:52,
                 from /usr/include/x86_64-linux-gnu/c++/14/bits/stdc++.h:52:
/usr/include/c++/14/bits/basic_string.h:3598:5: note: candidate: 'template<class _CharT, class _Traits, class _Alloc> std::__cxx11::basic_string<_CharT, _Traits, _Allocator> std::operator+(const __cxx11::basic_string<_CharT, _Traits, _Allocator>&, const __cxx11::basic_string<_CharT, _Traits, _Allocator>&)'
 3598 |     operator+(const basic_string<_CharT, _Traits, _Alloc>& __lhs,
      |     ^~~~~~~~
/usr/include/c++/14/bits/basic_string.h:3598:5: note:   template argument deduction/substitution failed:
a.cc:21:72: note:   'item' is not derived from 'const std::__cxx11::basic_string<_CharT, _Traits, _Allocator>'
   21 |       int maxValue = j <= weight ? max(dp[i-1][j], dp[i-1][j-weight] + value) : 0;
      |                                                                        ^~~~~
/usr/include/c++/14/bits/basic_string.h:3616:5: note: candidate: 'template<class _CharT, class _Traits, class _Alloc> std::__cxx11::basic_string<_CharT, _Traits, _Allocator> std::operator+(const _CharT*, const __cxx11::basic_string<_CharT, _Traits, _Allocator>&)'
 3616 |     operator+(const _CharT* __lhs,
      |     ^~~~~~~~
/usr/include/c++/14/bits/basic_string.h:3616:5: note:   template argument deduction/substitution failed:
a.cc:21:72: note:   mismatched types 'const _CharT*' and 'item'
   21 |       int maxValue = j <= weight ? max(dp[i-1][j], dp[i-1][j-weight] + value) : 0;
      |                                                                        ^~~~~
/usr/include/c++/14/bits/basic_string.h:3635:5: note: candidate: 'template<class _CharT, class _Traits, class _Alloc> std::__cxx11::basic_string<_CharT, _Traits, _Allocator> std::operator+(_CharT, const __cxx11::basic_string<_CharT, _Traits, _Allocator>&)'
 3635 |     operator+(_CharT __lhs, const basic_string<_CharT,_Traits,_Alloc>& __rhs)
      |     ^~~~~~~~
/usr/include/c++/14/bits/basic_string.h:3635:5: note:   template argument deduction/substitution failed:
a.cc:21:72: note:   mismatched types 'const std::__cxx11::basic_string<_CharT, _Traits, _Allocator>' and 'int'
   21 |       int maxValue = j <= weight ? max(dp[i-1][j], dp[i-1][j-weight] + value) : 0;
      |                                                                        ^~~~~
/usr/include/c++/14/bits/basic_string.h:3652:5: note: candidate: 'template<class _CharT, class _Traits, class _Alloc> std::__cxx11::basic_string<_CharT, _Traits, _Allocator> std::operator+(const __cxx11::basic_string<_CharT, _Traits, _Allocator>&, const _CharT*)'
 3652 |     operator+(const basic_string<_CharT, _Traits, _Alloc>& __lhs,
      |     ^~~~~~~~
/usr/include/c++/14/bits/basic_string.h:3652:5: note:   template argument deduction/substitution failed:
a.cc:21:72: note:   'item' is not derived from 'const std::__cxx11::basic_string<_CharT, _Traits, _Allocator>'
   21 |       int maxValue = j <= weight ? max(dp[i-1][j], dp[i-1][j-weight] + value) : 0;
      |                                                                        ^~~~~
/usr/include/c++/14/bits/basic_string.h:3670:5: note: candidate: 'template<class _CharT, class _Traits, class _Alloc> std::__cxx11::basic_string<_CharT, _Traits, _Allocator> std::operator+(const __cxx11::basic_string<_CharT, _Traits, _Allocator>&, _CharT)'
 3670 |     operator+(const basic_string<_CharT, _Traits, _Alloc>& __lhs, _CharT __rhs)
      |     ^~~~~~~~
/usr/include/c++/14/bits/basic_string.h:3670:5: note:   template argument deduction/substitution failed:
a.cc:21:72: note:   'item' is not derived from 'const std::__cxx11::basic_string<_CharT, _Traits, _Allocator>'
   21 |       int maxValue = j <= weight ? max(dp[i-1][j], dp[i-1][j-weight] + value) : 0;
      |                                                                        ^~~~~
/usr/include/c++/14/bits/basic_string.h:3682:5: note: candidate: 'template<class _CharT, class _Traits, class _Alloc> std::__cxx11::basic_string<_CharT, _Traits, _Allocator> std::operator+(__cxx11::basic_string<_CharT, _Traits, _Allocator>&&, const __cxx11::basic_string<_CharT, _Traits, _Allocator>&)'
 3682 |     operator+(basic_string<_CharT, _Traits, _Alloc>&& __lhs,
      |     ^~~~~~~~
/usr/include/c++/14/bits/basic_string.h:3682:5: note:   template argument deduction/substitution failed:
a.cc:21:72: note:   'item' is not derived from 'std::__cxx11::basic_string<_CharT, _Traits, _Allocator>'
   21 |       int maxValue = j <= weight ? max(dp[i-1][j], dp[i-1][j-weight] + value) : 0;
      |                                                                        ^~~~~
/usr/include/c++/14/bits/basic_string.h:3689:5: note: candidate: 'template<class _CharT, class _Traits, class _Alloc> std::__cxx11::basic_string<_CharT, _Traits, _Allocator> std::operator+(const __cxx11::basic_string<_CharT, _Traits, _Allocator>&, __cxx11::basic_string<_CharT, _Traits, _Allocator>&&)'
 3689 |     operator+(const basic_string<_CharT, _Traits, _Alloc>& __lhs,
      |     ^~~~~~~~
/usr/include/c++/14/bits/basic_string.h:3689:5: note:   template argument deduction/substitution failed:
a.cc:21:72: note:   'item' is not derived from 'const std::__cxx11::basic_string<_CharT, _Traits, _Allocator>'
   21 |       int maxValue = j <= weight ? max(dp[i-1][j], dp[i-1][j-weight] + value) : 0;
      |                                                                        ^~~~~
/usr/include/c++/14/bits/basic_string.h:3696:5: note: candidate: 'template<class _CharT, class _Traits, class _Alloc> std::__cxx11::basic_string<_CharT, _Traits, _Allocator> std::operator+(__cxx11::basic_string<_CharT, _Traits, _Allocator>&&, __cxx11::basic_string<_CharT, _Traits, _Allocator>&&)'
 3696 |     operator+(basic_string<_CharT, _Traits, _Alloc>&& __lhs,
      |     ^~~~~~~~
/usr/include/c++/14/bits/basic_string.h:3696:5: note:   template argument deduction/substitution failed:
a.cc:21:72: note:   'item' is not derived from 'std::__cxx11::basic_string<_CharT, _Traits, _Allocator>'
   21 |       int maxValue = j <= weight ? max(dp[i-1][j], dp[i-1][j-weight] + value) : 0;
      |                                                                        ^~~~~
/usr/include/c++/14/bits/basic_string.h:3719:5: note: candidate: 'template<class _CharT, class _Traits, class _Alloc> std::__cxx11::basic_string<_CharT, _Traits, _Allocator> std::operator+(const _CharT*, __cxx11::basic_string<_CharT, _Traits, _Allocator>&&)'
 3719 |     operator+(const _CharT* __lhs,
      |     ^~~~~~~~
/usr/include/c++/14/bits/basic_string.h:3719:5: note:   template argument deduction/substitution failed:
a.cc:21:72: note:   mismatched types 'const _CharT*' and 'item'
   21 |       int maxValue = j <= weight ? max(dp[i-1][j], dp[i-1][j-weight] + value) : 0;
      |                                                                        ^~~~~
/usr/include/c++/14/bits/basic_string.h:3726:5: note: candidate: 'template<class _CharT, class _Traits, class _Alloc> std::__cxx11::basic_string<_CharT, _Traits, _Allocator> std::operator+(_CharT, __cxx11::basic_string<_CharT, _Traits, _Allocator>&&)'
 3726 |     operator+(_CharT __lhs,
      |     ^~~~~~~~
/usr/include/c++/14/bits/basic_string.h:3726:5: note:   template argument deduction/substitution failed:
a.cc:21:72: note:   mismatched types 'std::__cxx11::basic_string<_CharT, _Traits, _Allocator>' and 'int'
   21 |       int maxValue = j <= weight ? max(dp[i-1][j], dp[i-1][j-weight] + value) : 0;
      |                                                                        ^~~~~
/usr/include/c++/14/bits/basic_string.h:3733:5: note: candidate: 'template<class _CharT, class _Traits, class _Alloc> std::__cxx11::basic_string<_CharT, _Traits, _Allocator> std::operator+(__cxx11::basic_string<_CharT, _Traits, _Allocator>&&, const _CharT*)'
 3733 |     operator+(basic_string<_CharT, _Traits, _Alloc>&& __lhs,
      |     ^~~~~~~~
/usr/include/c++/14/bits/basic_string.h:3733:5: note:   template argument deduction/substitutio