Language: C++

#include <iostream>
#include <climits>
#include <algorithm>
using namespace std;
typedef long long ll;

// 入力
int n, W;
ll weight[110], value[110];

// DPテーブル
int dp[110][10010];

int main() {
	cin >> n >> W;
	for (int i = 0; i < n; i++) cin >> weight[i] >> value[i];

	// DP初期条件: dp[0][w] = 0
	for (int w = 0; w <= W; w++) dp[0][w] = 0;

	// DPループ　前から今ではなく、今から次を考えるときはiは0~n-1の範囲を動くようにする
	for (int i = 0; i < n; ++i) {
		for (int w = 0; w <= W; w++) {
			if (w >= weight[i]) dp[i + 1][w] = max(dp[i][w - weight[i]] + value[i], dp[i][w]);
			else dp[i + 1][w] = dp[i][w];
		}
	}

	cout << dp[n][W] << endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:24:63: error: no matching function for call to 'max(ll, int&)'
   24 |                         if (w >= weight[i]) dp[i + 1][w] = max(dp[i][w - weight[i]] + value[i], dp[i][w]);
      |                                                            ~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
In file included from /usr/include/c++/14/string:51,
                 from /usr/include/c++/14/bits/locale_classes.h:40,
                 from /usr/include/c++/14/bits/ios_base.h:41,
                 from /usr/include/c++/14/ios:44,
                 from /usr/include/c++/14/ostream:40,
                 from /usr/include/c++/14/iostream:41,
                 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:24:63: note:   deduced conflicting types for parameter 'const _Tp' ('long long int' and 'int')
   24 |                         if (w >= weight[i]) dp[i + 1][w] = max(dp[i][w - weight[i]] + value[i], dp[i][w]);
      |                                                            ~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/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,
                 from a.cc:3:
/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:24:63: note:   mismatched types 'std::initializer_list<_Tp>' and 'long long int'
   24 |                         if (w >= weight[i]) dp[i + 1][w] = max(dp[i][w - weight[i]] + value[i], dp[i][w]);
      |                                                            ~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~