Language: C++

	#include<cstdio>
	#include<iostream>
	#include<map>
	#include<set>
	#include<vector>
	#include<cstring>
	#include<cassert>
	#include<sstream>
	#include<cmath>
	#include<algorithm>
	#include<queue>
	#include<limits>
	#include<ctime>
	#include<stack>
	#include<bits/stdc++.h>
	#include<string>
	#include<stdlib.h>
	#include<stdio.h>
	
	typedef long long ll;
	using namespace std;
	const ll x=1000000007;
	int mod(ll a){
		return a%x;
	}
	int main(){
		ll n,maks=0;
		cin>>n;
		if(n<4){
			cout<<1;
		}
		else{
			int i=2;
			while(i<=n){
				int j=2;
				while(pow(i,j)<=n){
					maks=max(maks,pow(i,j));
					j++;
				}
				i++;
			}
			cout<<maks;
		}
	}

Compiler output:
a.cc: In function 'int main()':
a.cc:37:49: error: no matching function for call to 'max(ll&, __gnu_cxx::__promote<double>::__type)'
   37 |                                         maks=max(maks,pow(i,j));
      |                                              ~~~^~~~~~~~~~~~~~~
In file included from /usr/include/c++/14/string:51,
                 from /usr/include/c++/14/bits/locale_classes.h:40,
                 from /usr/include/c++/14/bits/ios_base.h:41,
                 from /usr/include/c++/14/ios:44,
                 from /usr/include/c++/14/ostream:40,
                 from /usr/include/c++/14/iostream:41,
                 from a.cc:2:
/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:37:49: note:   deduced conflicting types for parameter 'const _Tp' ('long long int' and '__gnu_cxx::__promote<double>::__type' {aka 'double'})
   37 |                                         maks=max(maks,pow(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,
                 from a.cc:10:
/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:37:49: note:   mismatched types 'std::initializer_list<_Tp>' and 'long long int'
   37 |                                         maks=max(maks,pow(i,j));
      |                                              ~~~^~~~~~~~~~~~~~~