Language: C++

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

typedef long long ll;
typedef pair<int,int> p_int;
typedef pair<ll,ll> p_ll;
typedef tuple<ll,ll,ll> t3_ll;
int dx[] = {-1,0,1,0},dy[] = {0,1,0,-1};
int prime[] = {2,3,5,7,11,13,17,19,23,29,31,37,41,43,47,53,59,61,67,71,73,79,83,89,97};
const ll inf = 1000000007;

int main() {
	int n,W;
	cin >> n >> W;
	ll w[n],v[n];
	map<ll,ll> dp[n];
	for (int i = 0;i < n;i++) {
		cin >> w[i] >> v[i];
	}
	dp[0][0] = 0; dp[0][w[0]] = v[0];
	for (int i = 0;i < n-1;i++) {
		for (auto j = dp[i].begin();j != dp[i].end();j++) {
			dp[i+1][j] = max(dp[i+1][j],dp[i][j]);
			if (j+w[i+1] <= W) {
				dp[i+1][j+w[i+1]] = max(dp[i+1][j+w[i+1]],dp[i][j]+v[i+1]);
			}
		}
	}
	ll ans = 0;
	for (auto itr = dp[n-1].begin();itr != dp[n-1].end();itr++) {
		ans = max(ans,itr -> second);
	}
	cout << ans << endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:23:32: error: no match for 'operator[]' (operand types are 'std::map<long long int, long long int>' and 'std::_Rb_tree_iterator<std::pair<const long long int, long long int> >')
   23 |                         dp[i+1][j] = max(dp[i+1][j],dp[i][j]);
      |                                ^
In file included from /usr/include/c++/14/map:63,
                 from /usr/include/x86_64-linux-gnu/c++/14/bits/stdc++.h:152,
                 from a.cc:1:
/usr/include/c++/14/bits/stl_map.h:504:7: note: candidate: 'std::map<_Key, _Tp, _Compare, _Alloc>::mapped_type& std::map<_Key, _Tp, _Compare, _Alloc>::operator[](const key_type&) [with _Key = long long int; _Tp = long long int; _Compare = std::less<long long int>; _Alloc = std::allocator<std::pair<const long long int, long long int> >; mapped_type = long long int; key_type = long long int]'
  504 |       operator[](const key_type& __k)
      |       ^~~~~~~~
/usr/include/c++/14/bits/stl_map.h:504:34: note:   no known conversion for argument 1 from 'std::_Rb_tree_iterator<std::pair<const long long int, long long int> >' to 'const std::map<long long int, long long int>::key_type&' {aka 'const long long int&'}
  504 |       operator[](const key_type& __k)
      |                  ~~~~~~~~~~~~~~~~^~~
/usr/include/c++/14/bits/stl_map.h:524:7: note: candidate: 'std::map<_Key, _Tp, _Compare, _Alloc>::mapped_type& std::map<_Key, _Tp, _Compare, _Alloc>::operator[](key_type&&) [with _Key = long long int; _Tp = long long int; _Compare = std::less<long long int>; _Alloc = std::allocator<std::pair<const long long int, long long int> >; mapped_type = long long int; key_type = long long int]'
  524 |       operator[](key_type&& __k)
      |       ^~~~~~~~
/usr/include/c++/14/bits/stl_map.h:524:29: note:   no known conversion for argument 1 from 'std::_Rb_tree_iterator<std::pair<const long long int, long long int> >' to 'std::map<long long int, long long int>::key_type&&' {aka 'long long int&&'}
  524 |       operator[](key_type&& __k)
      |                  ~~~~~~~~~~~^~~
a.cc:23:49: error: no match for 'operator[]' (operand types are 'std::map<long long int, long long int>' and 'std::_Rb_tree_iterator<std::pair<const long long int, long long int> >')
   23 |                         dp[i+1][j] = max(dp[i+1][j],dp[i][j]);
      |                                                 ^
/usr/include/c++/14/bits/stl_map.h:504:7: note: candidate: 'std::map<_Key, _Tp, _Compare, _Alloc>::mapped_type& std::map<_Key, _Tp, _Compare, _Alloc>::operator[](const key_type&) [with _Key = long long int; _Tp = long long int; _Compare = std::less<long long int>; _Alloc = std::allocator<std::pair<const long long int, long long int> >; mapped_type = long long int; key_type = long long int]'
  504 |       operator[](const key_type& __k)
      |       ^~~~~~~~
/usr/include/c++/14/bits/stl_map.h:504:34: note:   no known conversion for argument 1 from 'std::_Rb_tree_iterator<std::pair<const long long int, long long int> >' to 'const std::map<long long int, long long int>::key_type&' {aka 'const long long int&'}
  504 |       operator[](const key_type& __k)
      |                  ~~~~~~~~~~~~~~~~^~~
/usr/include/c++/14/bits/stl_map.h:524:7: note: candidate: 'std::map<_Key, _Tp, _Compare, _Alloc>::mapped_type& std::map<_Key, _Tp, _Compare, _Alloc>::operator[](key_type&&) [with _Key = long long int; _Tp = long long int; _Compare = std::less<long long int>; _Alloc = std::allocator<std::pair<const long long int, long long int> >; mapped_type = long long int; key_type = long long int]'
  524 |       operator[](key_type&& __k)
      |       ^~~~~~~~
/usr/include/c++/14/bits/stl_map.h:524:29: note:   no known conversion for argument 1 from 'std::_Rb_tree_iterator<std::pair<const long long int, long long int> >' to 'std::map<long long int, long long int>::key_type&&' {aka 'long long int&&'}
  524 |       operator[](key_type&& __k)
      |                  ~~~~~~~~~~~^~~
a.cc:23:58: error: no match for 'operator[]' (operand types are 'std::map<long long int, long long int>' and 'std::_Rb_tree_iterator<std::pair<const long long int, long long int> >')
   23 |                         dp[i+1][j] = max(dp[i+1][j],dp[i][j]);
      |                                                          ^
/usr/include/c++/14/bits/stl_map.h:504:7: note: candidate: 'std::map<_Key, _Tp, _Compare, _Alloc>::mapped_type& std::map<_Key, _Tp, _Compare, _Alloc>::operator[](const key_type&) [with _Key = long long int; _Tp = long long int; _Compare = std::less<long long int>; _Alloc = std::allocator<std::pair<const long long int, long long int> >; mapped_type = long long int; key_type = long long int]'
  504 |       operator[](const key_type& __k)
      |       ^~~~~~~~
/usr/include/c++/14/bits/stl_map.h:504:34: note:   no known conversion for argument 1 from 'std::_Rb_tree_iterator<std::pair<const long long int, long long int> >' to 'const std::map<long long int, long long int>::key_type&' {aka 'const long long int&'}
  504 |       operator[](const key_type& __k)
      |                  ~~~~~~~~~~~~~~~~^~~
/usr/include/c++/14/bits/stl_map.h:524:7: note: candidate: 'std::map<_Key, _Tp, _Compare, _Alloc>::mapped_type& std::map<_Key, _Tp, _Compare, _Alloc>::operator[](key_type&&) [with _Key = long long int; _Tp = long long int; _Compare = std::less<long long int>; _Alloc = std::allocator<std::pair<const long long int, long long int> >; mapped_type = long long int; key_type = long long int]'
  524 |       operator[](key_type&& __k)
      |       ^~~~~~~~
/usr/include/c++/14/bits/stl_map.h:524:29: note:   no known conversion for argument 1 from 'std::_Rb_tree_iterator<std::pair<const long long int, long long int> >' to 'std::map<long long int, long long int>::key_type&&' {aka 'long long int&&'}
  524 |       operator[](key_type&& __k)
      |                  ~~~~~~~~~~~^~~
a.cc:24:30: error: no match for 'operator+' (operand types are 'std::_Rb_tree_iterator<std::pair<const long long int, long long int> >' and 'll' {aka 'long long int'})
   24 |                         if (j+w[i+1] <= W) {
      |                             ~^~~~~~~
      |                             |      |
      |                             |      ll {aka long long int}
      |                             std::_Rb_tree_iterator<std::pair<const long long int, long long int> >
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:
/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:24:36: note:   mismatched types 'const std::reverse_iterator<_Iterator>' and 'll' {aka 'long long int'}
   24 |                         if (j+w[i+1] <= W) {
      |                                    ^
/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:24:36: note:   mismatched types 'const std::move_iterator<_IteratorL>' and 'll' {aka 'long long int'}
   24 |                         if (j+w[i+1] <= W) {
      |                                    ^
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:24:36: note:   'std::_Rb_tree_iterator<std::pair<const long long int, long long int> >' is not derived from 'const std::__cxx11::basic_string<_CharT, _Traits, _Allocator>'
   24 |                         if (j+w[i+1] <= W) {
      |                                    ^
/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:24:36: note:   mismatched types 'const _CharT*' and 'std::_Rb_tree_iterator<std::pair<const long long int, long long int> >'
   24 |                         if (j+w[i+1] <= W) {
      |                                    ^
/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:24:36: note:   mismatched types 'const std::__cxx11::basic_string<_CharT, _Traits, _Allocator>' and 'll' {aka 'long long int'}
   24 |                         if (j+w[i+1] <= W) {
      |                                    ^
/usr/include/c++/14/bits/basic_string.h:3652:5: note: can