Language: C++

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

#define ull unsigned long long
#define endl '\n'
#define ll unsigned long long
const int N = 5e3 + 5;
ll mod = 1e9 + 7;
map<ll, ll> mem;
ll sum[N], fact[N];
int main(){
        ios_base::sync_with_stdio(false);
        cin.tie(0);
        cout.tie(0);
        if (fopen(".INP", "r")){
                freopen(".INP", "r", stdin);
                freopen(".OUT", "w", stdout);
        }
        ll n;
        cin >> n;
        string s;
        cin >> s;
        s = " " + s;
        int ans = 0;
        fact[0] = 1;
        sum[0] = 0;
        for (ull i = 1; i <= n; i++) fact[i] = fact[i - 1] * 311 % mod;
        for (ull i = 1; i <= n; i++){
                sum[i] = (sum[i - 1] * 311 + (s[i] - 'a' + 1)) % mod;
                for (ull j = 0; j < i; j++){
                        ll ha = (sum[i] - sum[j] * fact[i - j] + mod * mod) % mod;
                        if (mem[ha] == 0) {
                                mem[ha] = i;
                        } else {
                                if (mem[ha] <= 1ull * j) {
                                        ans = max(ans, i - j);
                                }
                        }
                }
        }
        cout << ans;
}
/*
*/


Compiler output:
a.cc: In function 'int main()':
a.cc:36:50: error: no matching function for call to 'max(int&, long long unsigned int)'
   36 |                                         ans = max(ans, i - 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:36:50: note:   deduced conflicting types for parameter 'const _Tp' ('int' and 'long long unsigned int')
   36 |                                         ans = max(ans, i - 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:36:50: note:   mismatched types 'std::initializer_list<_Tp>' and 'int'
   36 |                                         ans = max(ans, i - j);
      |                                               ~~~^~~~~~~~~~~~