Language: C++

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

int main(){
    ll n, k;
    vector<ll> p, c;

    cin >> n >> k;
    p.assign(n+1,0);
    c.assign(n+1,0);
    for(int i=1;i<=n;i++){
        cin >> p[i];
    }
    for(int i=1;i<=n;i++){
        cin >> c[i];
    }

    vector<ll> best(n+1,0);
    for(int i=1;i<=n;i++){
        best[i] = c[p[i]];
    }
    for(int i=1;i<=n;i++){
        vector<ll> d(n+1,0), visited(n+1,0);
        int cnt = 0, j=i;
        ll answ=0, last=i;
        while(cnt<k && visited[j]==false){
            visited[j] = ++cnt;
            d[j] = answ;
            last = j;
            j = p[j];
            answ+=c[j];
            best[i] = max(best[i],answ);
        }
        
        ll k1 = k;
        k1-=cnt;
        k1 = max(k1,0);
        answ += (answ-d[j])*(k1/(visited[last]-visited[j]+1));
        best[i] = max(best[i],answ);
        k1 = k1%(visited[last]-visited[j]+1);
        cnt = 0;
        while(cnt<k1){
            ++cnt;
            j = p[j];
            answ+=c[j];
            best[i] = max(best[i],answ);
        }
    }

    ll resp=best[1];
    for(int i=1;i<=n;i++){
        resp = max(resp,best[i]);
    }

    cout << resp <<"\n";


    return 0;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:38:17: error: no matching function for call to 'max(long long int&, int)'
   38 |         k1 = max(k1,0);
      |              ~~~^~~~~~
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:38:17: note:   deduced conflicting types for parameter 'const _Tp' ('long long int' and 'int')
   38 |         k1 = max(k1,0);
      |              ~~~^~~~~~
/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:38:17: note:   mismatched types 'std::initializer_list<_Tp>' and 'long long int'
   38 |         k1 = max(k1,0);
      |              ~~~^~~~~~