Language: C++

#include <bits/stdc++.h> 
using namespace std; 
  
// Function to return the maximized gcd 
// after removing a single element 
// from the given array 
long long MaxGCD(long long a[], long long n) 
{ 
  
    // Prefix and Suffix arrays 
    long long Prefix[n + 2]; 
    long long Suffix[n + 2]; 
  
    // Single state dynamic programming relation 
    // for storing gcd of first i elements 
    // from the left in Prefix[i] 
    Prefix[1] = a[0]; 
    for (int i = 2; i <= n; i += 1) { 
        Prefix[i] = __gcd(Prefix[i - 1], a[i - 1]); 
    } 
  
    // Initializing Suffix array 
    Suffix[n] = a[n - 1]; 
  
    // Single state dynamic programming relation 
    // for storing gcd of all the elements having 
    // greater than or equal to i in Suffix[i] 
    for (int i = n - 1; i >= 1; i -= 1) { 
        Suffix[i] = __gcd(Suffix[i + 1], a[i - 1]); 
    } 
  
    // If first or last element of 
    // the array has to be removed 
    int ans = max(Suffix[2], Prefix[n - 1]); 
  
    // If any other element is replaced 
    for (int i = 2; i < n; i += 1) { 
        ans = max(ans, __gcd(Prefix[i - 1], Suffix[i + 1])); 
    } 
  
    // Return the maximized gcd 
    return ans; 
} 

int main()
{
long long n;
long long a[n];
for(int i=0;i<n;i++)
cin>>a[i];
cout<<MaxGCD(a,n);
return 0;
}


Compiler output:
a.cc: In function 'long long int MaxGCD(long long int*, long long int)':
a.cc:38:18: error: no matching function for call to 'max(int&, long long int)'
   38 |         ans = max(ans, __gcd(Prefix[i - 1], Suffix[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:38:18: note:   deduced conflicting types for parameter 'const _Tp' ('int' and 'long long int')
   38 |         ans = max(ans, __gcd(Prefix[i - 1], Suffix[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:38:18: note:   mismatched types 'std::initializer_list<_Tp>' and 'int'
   38 |         ans = max(ans, __gcd(Prefix[i - 1], Suffix[i + 1]));
      |               ~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~