Language: C++

#include<bits/stdc++.h>
using namespace std;
int main(){
  int n;
  cin>>n;
  int a;
  cin>>a;
  vector<int>rec;
  rec.push_back(a);
  for(int i=1;i<n;i++){
    cin>>a;
    int size=rec.size();
    int r=0;
    int l=size-1;
    int mit=(r+l)/2;
    while(r<l){
      mit=(r+l)/2;
      if(rec[mit]==a){
	break;
      }
      if(rec[mit]<a){
	r=mit+1;
      }
      if(rec[mit]>a){
	l=mit-1;
      }
    }
    if(rec[mit]!=a){
      rec.push_back(a);
      sort(rec.begin(),rec.end());
    }
  }
  int base=rec[1],ch,knt=1,gg;
  while(base>1){
    ch=0;
    for(int i=2;i<rec.size();i++){
      if(base<=rec[0]&&rec%base==0&&ch==0&&rec[i]%base!=0){
	ch=1;
      }
      if(rec[i]%base!=0){
	ch=2;
	break;
      }
    }
    if(ch!=2){
      gg=base;
      break;
    }
    while(1){
      knt++;
      if(rec[1]%knt==0){
	base=rec[1]/knt;
	  break;
      }
    }
  }
  base=rec[0];
  knt=1;
  while(1){
    ch=0;
    for(int i=1;i<rec.size();i++){
      if(ch==1&&rec[i]%base!=0){
	ch=2;
	break;
      }
      if(rec[i]%base!=0){
	ch=1;
      }
    }
    if(ch!=2){
      if(gg>base){
	cout<<gg<<endl;
      }else{
	cout<<base<<endl;
      }
      return(0);
    }
    while(1){
      knt++;
      if(rec[0]%knt==0){
	base=rec[0]/knt;
	  break;
      }
    }
  }
  return(0);
}


Compiler output:
a.cc: In function 'int main()':
a.cc:37:27: error: no match for 'operator%' (operand types are 'std::vector<int>' and 'int')
   37 |       if(base<=rec[0]&&rec%base==0&&ch==0&&rec[i]%base!=0){
      |                        ~~~^~~~~
      |                        |   |
      |                        |   int
      |                        std::vector<int>
In file included from /usr/include/c++/14/valarray:605,
                 from /usr/include/x86_64-linux-gnu/c++/14/bits/stdc++.h:166,
                 from a.cc:1:
/usr/include/c++/14/bits/valarray_after.h:409:5: note: candidate: 'template<class _Dom1, class _Dom2> std::_Expr<std::__detail::_BinClos<std::__modulus, std::_Expr, std::_Expr, _Dom1, _Dom2>, typename std::__fun<std::__modulus, typename _Dom1::value_type>::result_type> std::operator%(const _Expr<_Dom1, typename _Dom1::value_type>&, const _Expr<_Dom2, typename _Dom2::value_type>&)'
  409 |     _DEFINE_EXPR_BINARY_OPERATOR(%, struct std::__modulus)
      |     ^~~~~~~~~~~~~~~~~~~~~~~~~~~~
/usr/include/c++/14/bits/valarray_after.h:409:5: note:   template argument deduction/substitution failed:
a.cc:37:28: note:   'std::vector<int>' is not derived from 'const std::_Expr<_Dom1, typename _Dom1::value_type>'
   37 |       if(base<=rec[0]&&rec%base==0&&ch==0&&rec[i]%base!=0){
      |                            ^~~~
/usr/include/c++/14/bits/valarray_after.h:409:5: note: candidate: 'template<class _Dom> std::_Expr<std::__detail::_BinClos<std::__modulus, std::_Expr, std::_Constant, _Dom, typename _Dom::value_type>, typename std::__fun<std::__modulus, typename _Dom1::value_type>::result_type> std::operator%(const _Expr<_Dom1, typename _Dom1::value_type>&, const typename _Dom::value_type&)'
  409 |     _DEFINE_EXPR_BINARY_OPERATOR(%, struct std::__modulus)
      |     ^~~~~~~~~~~~~~~~~~~~~~~~~~~~
/usr/include/c++/14/bits/valarray_after.h:409:5: note:   template argument deduction/substitution failed:
a.cc:37:28: note:   'std::vector<int>' is not derived from 'const std::_Expr<_Dom1, typename _Dom1::value_type>'
   37 |       if(base<=rec[0]&&rec%base==0&&ch==0&&rec[i]%base!=0){
      |                            ^~~~
/usr/include/c++/14/bits/valarray_after.h:409:5: note: candidate: 'template<class _Dom> std::_Expr<std::__detail::_BinClos<std::__modulus, std::_Constant, std::_Expr, typename _Dom::value_type, _Dom>, typename std::__fun<std::__modulus, typename _Dom1::value_type>::result_type> std::operator%(const typename _Dom::value_type&, const _Expr<_Dom1, typename _Dom1::value_type>&)'
  409 |     _DEFINE_EXPR_BINARY_OPERATOR(%, struct std::__modulus)
      |     ^~~~~~~~~~~~~~~~~~~~~~~~~~~~
/usr/include/c++/14/bits/valarray_after.h:409:5: note:   template argument deduction/substitution failed:
a.cc:37:28: note:   mismatched types 'const std::_Expr<_Dom1, typename _Dom1::value_type>' and 'int'
   37 |       if(base<=rec[0]&&rec%base==0&&ch==0&&rec[i]%base!=0){
      |                            ^~~~
/usr/include/c++/14/bits/valarray_after.h:409:5: note: candidate: 'template<class _Dom> std::_Expr<std::__detail::_BinClos<std::__modulus, std::_Expr, std::_ValArray, _Dom, typename _Dom::value_type>, typename std::__fun<std::__modulus, typename _Dom1::value_type>::result_type> std::operator%(const _Expr<_Dom1, typename _Dom1::value_type>&, const valarray<typename _Dom::value_type>&)'
  409 |     _DEFINE_EXPR_BINARY_OPERATOR(%, struct std::__modulus)
      |     ^~~~~~~~~~~~~~~~~~~~~~~~~~~~
/usr/include/c++/14/bits/valarray_after.h:409:5: note:   template argument deduction/substitution failed:
a.cc:37:28: note:   'std::vector<int>' is not derived from 'const std::_Expr<_Dom1, typename _Dom1::value_type>'
   37 |       if(base<=rec[0]&&rec%base==0&&ch==0&&rec[i]%base!=0){
      |                            ^~~~
/usr/include/c++/14/bits/valarray_after.h:409:5: note: candidate: 'template<class _Dom> std::_Expr<std::__detail::_BinClos<std::__modulus, std::_ValArray, std::_Expr, typename _Dom::value_type, _Dom>, typename std::__fun<std::__modulus, typename _Dom1::value_type>::result_type> std::operator%(const valarray<typename _Dom::value_type>&, const _Expr<_Dom1, typename _Dom1::value_type>&)'
  409 |     _DEFINE_EXPR_BINARY_OPERATOR(%, struct std::__modulus)
      |     ^~~~~~~~~~~~~~~~~~~~~~~~~~~~
/usr/include/c++/14/bits/valarray_after.h:409:5: note:   template argument deduction/substitution failed:
a.cc:37:28: note:   mismatched types 'const std::_Expr<_Dom1, typename _Dom1::value_type>' and 'int'
   37 |       if(base<=rec[0]&&rec%base==0&&ch==0&&rec[i]%base!=0){
      |                            ^~~~
/usr/include/c++/14/valarray:1200:1: note: candidate: 'template<class _Tp> std::_Expr<std::__detail::_BinClos<std::__modulus, std::_ValArray, std::_ValArray, _Tp, _Tp>, typename std::__fun<std::__modulus, _Tp>::result_type> std::operator%(const valarray<_Tp>&, const valarray<_Tp>&)'
 1200 | _DEFINE_BINARY_OPERATOR(%, __modulus)
      | ^~~~~~~~~~~~~~~~~~~~~~~
/usr/include/c++/14/valarray:1200:1: note:   template argument deduction/substitution failed:
a.cc:37:28: note:   'std::vector<int>' is not derived from 'const std::valarray<_Tp>'
   37 |       if(base<=rec[0]&&rec%base==0&&ch==0&&rec[i]%base!=0){
      |                            ^~~~
/usr/include/c++/14/valarray:1200:1: note: candidate: 'template<class _Tp> std::_Expr<std::__detail::_BinClos<std::__modulus, std::_ValArray, std::_Constant, _Tp, _Tp>, typename std::__fun<std::__modulus, _Tp>::result_type> std::operator%(const valarray<_Tp>&, const typename valarray<_Tp>::value_type&)'
 1200 | _DEFINE_BINARY_OPERATOR(%, __modulus)
      | ^~~~~~~~~~~~~~~~~~~~~~~
/usr/include/c++/14/valarray:1200:1: note:   template argument deduction/substitution failed:
a.cc:37:28: note:   'std::vector<int>' is not derived from 'const std::valarray<_Tp>'
   37 |       if(base<=rec[0]&&rec%base==0&&ch==0&&rec[i]%base!=0){
      |                            ^~~~
/usr/include/c++/14/valarray:1200:1: note: candidate: 'template<class _Tp> std::_Expr<std::__detail::_BinClos<std::__modulus, std::_Constant, std::_ValArray, _Tp, _Tp>, typename std::__fun<std::__modulus, _Tp>::result_type> std::operator%(const typename valarray<_Tp>::value_type&, const valarray<_Tp>&)'
 1200 | _DEFINE_BINARY_OPERATOR(%, __modulus)
      | ^~~~~~~~~~~~~~~~~~~~~~~
/usr/include/c++/14/valarray:1200:1: note:   template argument deduction/substitution failed:
a.cc:37:28: note:   mismatched types 'const std::valarray<_Tp>' and 'int'
   37 |       if(base<=rec[0]&&rec%base==0&&ch==0&&rec[i]%base!=0){
      |                            ^~~~