Language: C++

#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
ll n,k;
ll p[5010];
ll c[5010];
ll ans = -1e9-7;
ll rec[5010];
ll mx[5010];
int main() {
    cin >> n >> k;
    for (int i = 0; i < n; i++) {
        cin >> p[i];
        p[i]--;
    }
    for (int j = 0; j < n; j++) cin >> c[j];
    for (int i = 0; i < n; i++) {
        int cnt = 0;
        int now = i;
        mx[0] = c[p[now]];
        rec[0] = 0;
        while (cnt < k) {
            cnt++;
            now = p[now];
            rec[cnt] = c[now] + rec[cnt-1];
            mx[cnt] = max(mx[cnt-1], rec[cnt]);
            if (now == i) break;
        }
        if (cnt >= k) {
            ans = max(ans, mx[min(cnt,k)]);
            continue;
        }
        //cnt < k
        if (rec[cnt] > 0) {
            ll kaisu = k / cnt;
            ll num = k - kaisu * cnt;
            if (num)
                ans = max(ans, kaisu * rec[cnt] + max(0LL, mx[num]));
            else
                ans = max(ans, kaisu * rec[cnt]);
        } else {
            ans = max(ans, mx[cnt]);
        }
    }
    cout << ans << endl;
    return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:30:34: error: no matching function for call to 'min(int&, ll&)'
   30 |             ans = max(ans, mx[min(cnt,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:233:5: note: candidate: 'template<class _Tp> constexpr const _Tp& std::min(const _Tp&, const _Tp&)'
  233 |     min(const _Tp& __a, const _Tp& __b)
      |     ^~~
/usr/include/c++/14/bits/stl_algobase.h:233:5: note:   template argument deduction/substitution failed:
a.cc:30:34: note:   deduced conflicting types for parameter 'const _Tp' ('int' and 'll' {aka 'long long int'})
   30 |             ans = max(ans, mx[min(cnt,k)]);
      |                               ~~~^~~~~~~
/usr/include/c++/14/bits/stl_algobase.h:281:5: note: candidate: 'template<class _Tp, class _Compare> constexpr const _Tp& std::min(const _Tp&, const _Tp&, _Compare)'
  281 |     min(const _Tp& __a, const _Tp& __b, _Compare __comp)
      |     ^~~
/usr/include/c++/14/bits/stl_algobase.h:281:5: 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:5686:5: note: candidate: 'template<class _Tp> constexpr _Tp std::min(initializer_list<_Tp>)'
 5686 |     min(initializer_list<_Tp> __l)
      |     ^~~
/usr/include/c++/14/bits/stl_algo.h:5686:5: note:   candidate expects 1 argument, 2 provided
/usr/include/c++/14/bits/stl_algo.h:5696:5: note: candidate: 'template<class _Tp, class _Compare> constexpr _Tp std::min(initializer_list<_Tp>, _Compare)'
 5696 |     min(initializer_list<_Tp> __l, _Compare __comp)
      |     ^~~
/usr/include/c++/14/bits/stl_algo.h:5696:5: note:   template argument deduction/substitution failed:
a.cc:30:34: note:   mismatched types 'std::initializer_list<_Tp>' and 'int'
   30 |             ans = max(ans, mx[min(cnt,k)]);
      |                               ~~~^~~~~~~