Language: C++

#include<bits/stdc++.h>
#define ll long long int
using namespace std;
ll i, temp,t, n, dp[100100], x, y, M, N;
vector<ll>adj[100010];
bool vis[100010];
int dfs(ll x)
{
    if(adj[x].size()==0)
        return 0;
    ll ans = 0;
    if(vis[x])
        return dp[x];
    vis[x] = true;
    for(ll i=0;i<adj[x].size();i++)
        ans = max(ans, dfs(adj[x][i])+1);
    return dp[x] = ans;
}
int main()
{
    //I am Monim, a tiny creature of Allah
    cin >> N >> M;
    ll ans= 0;
    for(i=1;i<=M;i++)
    {
        cin >> x >> y;
        adj[x].push_back(y);
    }
    for(i=1;i<=N;i++)
        if(!vis[i])
            ans = max(ans,dfs(i));
    cout << ans <<endl;
    return 0;
}



Compiler output:
a.cc: In function 'int dfs(long long int)':
a.cc:16:18: error: no matching function for call to 'max(long long int&, int)'
   16 |         ans = max(ans, dfs(adj[x][i])+1);
      |               ~~~^~~~~~~~~~~~~~~~~~~~~~~
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:16:18: note:   deduced conflicting types for parameter 'const _Tp' ('long long int' and 'int')
   16 |         ans = max(ans, dfs(adj[x][i])+1);
      |               ~~~^~~~~~~~~~~~~~~~~~~~~~~
/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:16:18: note:   mismatched types 'std::initializer_list<_Tp>' and 'long long int'
   16 |         ans = max(ans, dfs(adj[x][i])+1);
      |               ~~~^~~~~~~~~~~~~~~~~~~~~~~
a.cc: In function 'int main()':
a.cc:31:22: error: no matching function for call to 'max(long long int&, int)'
   31 |             ans = max(ans,dfs(i));
      |                   ~~~^~~~~~~~~~~~
/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:31:22: note:   deduced conflicting types for parameter 'const _Tp' ('long long int' and 'int')
   31 |             ans = max(ans,dfs(i));
      |                   ~~~^~~~~~~~~~~~
/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
/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:31:22: note:   mismatched types 'std::initializer_list<_Tp>' and 'long long int'
   31 |             ans = max(ans,dfs(i));
      |                   ~~~^~~~~~~~~~~~