Language: C++

#include <bits/stdc++.h>

#define ll long long
#define pii pair<int, int>
#define vi vector<int>
#define vvi vector<vector<int>>
#define vll vector<long long>
#define vvll vector<vector<long long>>
#define viit vector<int>::iterator
#define MOD 1000000007
#define endl "\n"
#define rep(i, a, b) for (int i = (a); i < (b); i++)
#define repe(i, a, b) for (int i = (a); i <= (b); i++)
#define repd(i, a, b) for (int i = (a); i >= (b); i--)
using namespace std;

int main() {
    ios_base::sync_with_stdio(false);
    cin.tie(0);
    cout.tie(0);
    int n, W;
    cin >> n >> W;
    vi w(n), v(n);
    rep(i, 0, n) cin >> w[i] >> v[i];
    short ans[n + 1][W + 1];
    repe(i, 0, n) ans[i][0] = 0;
    repe(i, 0, W) ans[0][i] = 0;
    repe(i, 1, n) {
        repe(j, 1, W) {
            if (w[i - 1] <= j) {
                ans[i][j] = max(v[i - 1] + ans[i - 1][j - w[i - 1]], ans[i - 1][j]);
            } else {
                ans[i][j] = ans[i - 1][j];
            }
        }
    }
    cout << ans[n][W];
    return 0;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:31:32: error: no matching function for call to 'max(__gnu_cxx::__alloc_traits<std::allocator<int>, int>::value_type, short int&)'
   31 |                 ans[i][j] = max(v[i - 1] + ans[i - 1][j - w[i - 1]], ans[i - 1][j]);
      |                             ~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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:31:32: note:   deduced conflicting types for parameter 'const _Tp' ('int' and 'short int')
   31 |                 ans[i][j] = max(v[i - 1] + ans[i - 1][j - w[i - 1]], ans[i - 1][j]);
      |                             ~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/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:31:32: note:   mismatched types 'std::initializer_list<_Tp>' and 'int'
   31 |                 ans[i][j] = max(v[i - 1] + ans[i - 1][j - w[i - 1]], ans[i - 1][j]);
      |                             ~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~