Language: C++

#include<bits/stdc++.h>
using namespace std;
typedef long long ll;
const int INF = 0x3f3f3f3f;
const int maxn = 5050;
#define ll __int128
int p[maxn];
ll c[maxn];
ll cy[maxn];
bool flag;
int cnt;
int num[maxn];
int n;
ll k;
void dfs(int i, int fa, ll &cost, ll &ma){
    cnt++;
    if(i == fa){
        flag = true;
        num[i] = cnt;
        cy[i] = cost;
    }
    if(flag) return;
    //cout << "i= " << i << " c[i] = " << c[i] << endl;
    cost += c[i];
    ma = max(ma, cost);
    dfs(p[i], fa, cost, ma);
    num[i] = cnt;
    cy[i] = cost;
}
void dfs2(int i, int id, ll nn, ll &cost, ll &ma){
    if(id >= nn){
        flag = true;
    }
    if(flag) return;
    //cout << id << "- >" << i << endl;
    cost += c[i];
    ma = max(ma, cost);
    dfs2(p[i], id + 1, nn, cost, ma);
}
int main()
{
    std::ios::sync_with_stdio(false);
    ll ans = -INF;
    cin >> n >> k;
    for(int i = 1;i <= n;i++){
        cin >> p[i];
    }
    for(int i = 1;i <= n;i++){
        cin >> c[i];
    }
    for(int i = 1;i <= n;i++){
        ll cost = c[i];
        ll ma = c[i];
        cnt = 0;
        flag = false;
        if(!num[i]){
            dfs(p[i], i, cost, ma);
        }
       // cout << "num[i] = " << num[i] << "  cy[i] = " << cy[i] << endl;;
        ll sum = k / num[i] * cy[i];
        ll cost2 = c[i];
        ll ma2 = max(c[i], 0LL);
        flag = false;
        dfs2(p[i], 1, k % num[i], cost2, ma2);
        ans = max(ans, max(ma, sum + ma2));
    }
    cout << ans << endl;
    return 0;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:44:14: error: no match for 'operator>>' (operand types are 'std::basic_istream<char>::__istream_type' {aka 'std::basic_istream<char>'} and '__int128')
   44 |     cin >> n >> k;
      |     ~~~~~~~~ ^~ ~
      |         |       |
      |         |       __int128
      |         std::basic_istream<char>::__istream_type {aka std::basic_istream<char>}
In file included from /usr/include/c++/14/sstream:40,
                 from /usr/include/c++/14/complex:45,
                 from /usr/include/c++/14/ccomplex:39,
                 from /usr/include/x86_64-linux-gnu/c++/14/bits/stdc++.h:127,
                 from a.cc:1:
/usr/include/c++/14/istream:170:7: note: candidate: 'std::basic_istream<_CharT, _Traits>::__istream_type& std::basic_istream<_CharT, _Traits>::operator>>(bool&) [with _CharT = char; _Traits = std::char_traits<char>; __istream_type = std::basic_istream<char>]' (near match)
  170 |       operator>>(bool& __n)
      |       ^~~~~~~~
/usr/include/c++/14/istream:170:7: note:   conversion of argument 1 would be ill-formed:
a.cc:44:17: error: cannot bind non-const lvalue reference of type 'bool&' to a value of type '__int128'
   44 |     cin >> n >> k;
      |                 ^
/usr/include/c++/14/istream:174:7: note: candidate: 'std::basic_istream<_CharT, _Traits>& std::basic_istream<_CharT, _Traits>::operator>>(short int&) [with _CharT = char; _Traits = std::char_traits<char>]' (near match)
  174 |       operator>>(short& __n);
      |       ^~~~~~~~
/usr/include/c++/14/istream:174:7: note:   conversion of argument 1 would be ill-formed:
a.cc:44:17: error: cannot bind non-const lvalue reference of type 'short int&' to a value of type '__int128'
   44 |     cin >> n >> k;
      |                 ^
/usr/include/c++/14/istream:177:7: note: candidate: 'std::basic_istream<_CharT, _Traits>::__istream_type& std::basic_istream<_CharT, _Traits>::operator>>(short unsigned int&) [with _CharT = char; _Traits = std::char_traits<char>; __istream_type = std::basic_istream<char>]' (near match)
  177 |       operator>>(unsigned short& __n)
      |       ^~~~~~~~
/usr/include/c++/14/istream:177:7: note:   conversion of argument 1 would be ill-formed:
a.cc:44:17: error: cannot bind non-const lvalue reference of type 'short unsigned int&' to a value of type '__int128'
   44 |     cin >> n >> k;
      |                 ^
/usr/include/c++/14/istream:181:7: note: candidate: 'std::basic_istream<_CharT, _Traits>& std::basic_istream<_CharT, _Traits>::operator>>(int&) [with _CharT = char; _Traits = std::char_traits<char>]' (near match)
  181 |       operator>>(int& __n);
      |       ^~~~~~~~
/usr/include/c++/14/istream:181:7: note:   conversion of argument 1 would be ill-formed:
a.cc:44:17: error: cannot bind non-const lvalue reference of type 'int&' to a value of type '__int128'
   44 |     cin >> n >> k;
      |                 ^
/usr/include/c++/14/istream:184:7: note: candidate: 'std::basic_istream<_CharT, _Traits>::__istream_type& std::basic_istream<_CharT, _Traits>::operator>>(unsigned int&) [with _CharT = char; _Traits = std::char_traits<char>; __istream_type = std::basic_istream<char>]' (near match)
  184 |       operator>>(unsigned int& __n)
      |       ^~~~~~~~
/usr/include/c++/14/istream:184:7: note:   conversion of argument 1 would be ill-formed:
a.cc:44:17: error: cannot bind non-const lvalue reference of type 'unsigned int&' to a value of type '__int128'
   44 |     cin >> n >> k;
      |                 ^
/usr/include/c++/14/istream:188:7: note: candidate: 'std::basic_istream<_CharT, _Traits>::__istream_type& std::basic_istream<_CharT, _Traits>::operator>>(long int&) [with _CharT = char; _Traits = std::char_traits<char>; __istream_type = std::basic_istream<char>]' (near match)
  188 |       operator>>(long& __n)
      |       ^~~~~~~~
/usr/include/c++/14/istream:188:7: note:   conversion of argument 1 would be ill-formed:
a.cc:44:17: error: cannot bind non-const lvalue reference of type 'long int&' to a value of type '__int128'
   44 |     cin >> n >> k;
      |                 ^
/usr/include/c++/14/istream:192:7: note: candidate: 'std::basic_istream<_CharT, _Traits>::__istream_type& std::basic_istream<_CharT, _Traits>::operator>>(long unsigned int&) [with _CharT = char; _Traits = std::char_traits<char>; __istream_type = std::basic_istream<char>]' (near match)
  192 |       operator>>(unsigned long& __n)
      |       ^~~~~~~~
/usr/include/c++/14/istream:192:7: note:   conversion of argument 1 would be ill-formed:
a.cc:44:17: error: cannot bind non-const lvalue reference of type 'long unsigned int&' to a value of type '__int128'
   44 |     cin >> n >> k;
      |                 ^
/usr/include/c++/14/istream:199:7: note: candidate: 'std::basic_istream<_CharT, _Traits>::__istream_type& std::basic_istream<_CharT, _Traits>::operator>>(long long int&) [with _CharT = char; _Traits = std::char_traits<char>; __istream_type = std::basic_istream<char>]' (near match)
  199 |       operator>>(long long& __n)
      |       ^~~~~~~~
/usr/include/c++/14/istream:199:7: note:   conversion of argument 1 would be ill-formed:
a.cc:44:17: error: cannot bind non-const lvalue reference of type 'long long int&' to a value of type '__int128'
   44 |     cin >> n >> k;
      |                 ^
/usr/include/c++/14/istream:203:7: note: candidate: 'std::basic_istream<_CharT, _Traits>::__istream_type& std::basic_istream<_CharT, _Traits>::operator>>(long long unsigned int&) [with _CharT = char; _Traits = std::char_traits<char>; __istream_type = std::basic_istream<char>]' (near match)
  203 |       operator>>(unsigned long long& __n)
      |       ^~~~~~~~
/usr/include/c++/14/istream:203:7: note:   conversion of argument 1 would be ill-formed:
a.cc:44:17: error: cannot bind non-const lvalue reference of type 'long long unsigned int&' to a value of type '__int128'
   44 |     cin >> n >> k;
      |                 ^
/usr/include/c++/14/istream:219:7: note: candidate: 'std::basic_istream<_CharT, _Traits>::__istream_type& std::basic_istream<_CharT, _Traits>::operator>>(float&) [with _CharT = char; _Traits = std::char_traits<char>; __istream_type = std::basic_istream<char>]' (near match)
  219 |       operator>>(float& __f)
      |       ^~~~~~~~
/usr/include/c++/14/istream:219:7: note:   conversion of argument 1 would be ill-formed:
a.cc:44:17: error: cannot bind non-const lvalue reference of type 'float&' to a value of type '__int128'
   44 |     cin >> n >> k;
      |                 ^
/usr/include/c++/14/istream:223:7: note: candidate: 'std::basic_istream<_CharT, _Traits>::__istream_type& std::basic_istream<_CharT, _Traits>::operator>>(double&) [with _CharT = char; _Traits = std::char_traits<char>; __istream_type = std::basic_istream<char>]' (near match)
  223 |       operator>>(double& __f)
      |       ^~~~~~~~
/usr/include/c++/14/istream:223:7: note:   conversion of argument 1 would be ill-formed:
a.cc:44:17: error: cannot bind non-const lvalue reference of type 'double&' to a value of type '__int128'
   44 |     cin >> n >> k;
      |                 ^
/usr/include/c++/14/istream:227:7: note: candidate: 'std::basic_istream<_CharT, _Traits>::__istream_type& std::basic_istream<_CharT, _Traits>::operator>>(long double&) [with _CharT = char; _Traits = std::char_traits<char>; __istream_type = std::basic_istream<char>]' (near match)
  227 |       operator>>(long double& __f)
      |       ^~~~~~~~
/usr/include/c++/14/istream:227:7: note:   conversion of argument 1 would be ill-formed:
a.cc:44:17: error: cannot bind non-const lvalue reference of type 'long double&' to a value of type '__int128'
   44 |     cin >> n >> k;
      |                 ^
/usr/include/c++/14/istream:328:7: note: candidate: 'std::basic_istream<_CharT, _Traits>::__istream_type& std::basic_istream<_CharT, _Traits>::operator>>(void*&) [with _CharT = char; _Traits = std::char_traits<char>; __istream_type = std::basic_istream<char>]' (near match)
  328 |       operator>>(void*& __p)
      |       ^~~~~~~~
/usr/include/c++/14/istream:328:7: note:   conversion of argument 1 would be ill-formed:
a.cc:44:17: error: invalid conversion from '__int128' to 'void*' [-fpermissive]
   44 |     cin >> n >> k;
      |                 ^
      |                 |
      |                 __int128
a.cc:44:17: error: cannot bind rvalue '(void*)((long int)k)' to 'void*&'
/usr/include/c++/14/istream:122:7: note: candidate: 'std::basic_istream<_CharT, _Traits>::__istream_type& std::basic_istream<_CharT, _Traits>::operator>>(__istream_type& (*)(__istream_type&)) [with _CharT = char; _Traits = std::char_traits<char>; __istream_type = std::basic_istream<char>]' (near match)
  122 |       operator>>(__istream_type& (*__pf)(__istream_type&))
      |       ^~~~~~~~
/usr/include/c++/14/istream:122:7: note:   conversion of argument 1 would be ill-formed:
a.cc:44:17: error: invalid conversion from '__int128' to 'std::basic_istream<char>::__istream_type& (*)(std::basic_istream<char>::__istream_type&)' {aka 'std::basic_istream<char>& (*)(std::basic_istream<char>&)'} [-fpermissive]
   44 |     cin >> n >> k;
      |                 ^
      |                 |
      |                 __int128
/usr/include/c++/14/istream:126:7: note: candidate: 'std::basic_istream<_CharT, _Traits>::__istream_type& std::basic_istream<_CharT, _Traits>::operator>>(__ios_type& (*)(__ios_type&)) [with _CharT = char; _Traits = std::char_traits<char>; __istream_type = std::basic_istream<char>; __ios_type = std::basic_ios<char>]' (near match)
  126 |       operator>>(__ios_type& (*__pf)(__ios_type&))
      |       ^~~~~~~~
/usr/include/c++/14/istream:126:7: note:   conversion of argument 1 would be ill-formed:
a.cc:44:17: error: invalid conversion from '__int128' to 'std::basic_istream<char>::__ios_type& (*)(std::basic_istream<char>::__ios_type&)' {aka 'std::basic_ios<char>& (*)(std::basic_ios<char>&)'} [-fpermissive]
   44 |     cin >> n >> k;
      |                 ^
      |                 |
      |                 __int128
/usr/include/c++/14/istream:133:7: note: candidate: 'std::basic_istream<_CharT, _Traits>::__istream_type& std::basic_istream<_CharT, _Traits>::operator>>(std::ios_base& (*)(std::ios_base&)) [with _CharT = char