Language: C++

#include <bits/stdc++.h>
#include <cstdlib>
#include <cmath>
#include <algorithm>
#define rep(i,n) for (long long i=0; i < (n); ++i)
#define rep2(i,n,m) for(long long i=n;i<=m;i++)
#define ALL(a)  (a).begin(),(a).end()
using namespace std;
using ll = long long;
using P = pair<int,int>;
const ll INF=1e18 ;
inline void chmax(ll& a,ll b){a=max(a,b);}
inline void chmin(ll& a,ll b){a=min(a,b);}
int main() {
 ll n ;
 cin >> n;
 vector<ll> A(n) ;
 rep(i,n) cin>> A[i] ;
 sort(A.begin(),A.end()) ;
 ll k=A[n-1] ;
 ll ans=A[0] ;
 ll small=INF ;
 rep(i,n-1) {
  if( small> abs(A[i]*2-k))  
  ans=A[i] ; 
  small =abs(A)
 }
 cout <<k<<endl;
 cout<<ans<<endl ;
 return 0;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:26:13: error: no matching function for call to 'abs(std::vector<long long int>&)'
   26 |   small =abs(A)
      |          ~~~^~~
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:445:5: note: candidate: 'template<class _Tp> std::_Expr<std::__detail::_UnClos<std::_Abs, std::_ValArray, _Tp>, _Tp> std::abs(const valarray<_Tp>&)'
  445 |     _DEFINE_EXPR_UNARY_FUNCTION(abs, struct std::_Abs)
      |     ^~~~~~~~~~~~~~~~~~~~~~~~~~~
/usr/include/c++/14/bits/valarray_after.h:445:5: note:   template argument deduction/substitution failed:
a.cc:26:13: note:   'std::vector<long long int>' is not derived from 'const std::valarray<_Tp>'
   26 |   small =abs(A)
      |          ~~~^~~
/usr/include/c++/14/bits/valarray_after.h:445:5: note: candidate: 'template<class _Dom> std::_Expr<std::__detail::_UnClos<std::_Abs, std::_Expr, _Dom>, typename _Dom::value_type> std::abs(const _Expr<_Dom1, typename _Dom1::value_type>&)'
  445 |     _DEFINE_EXPR_UNARY_FUNCTION(abs, struct std::_Abs)
      |     ^~~~~~~~~~~~~~~~~~~~~~~~~~~
/usr/include/c++/14/bits/valarray_after.h:445:5: note:   template argument deduction/substitution failed:
a.cc:26:13: note:   'std::vector<long long int>' is not derived from 'const std::_Expr<_Dom1, typename _Dom1::value_type>'
   26 |   small =abs(A)
      |          ~~~^~~
In file included from /usr/include/c++/14/ccomplex:39,
                 from /usr/include/x86_64-linux-gnu/c++/14/bits/stdc++.h:127:
/usr/include/c++/14/complex:892:5: note: candidate: 'template<class _Tp> _Tp std::abs(const complex<_Tp>&)'
  892 |     abs(const complex<_Tp>& __z) { return __complex_abs(__z.__rep()); }
      |     ^~~
/usr/include/c++/14/complex:892:5: note:   template argument deduction/substitution failed:
a.cc:26:13: note:   'std::vector<long long int>' is not derived from 'const std::complex<_Tp>'
   26 |   small =abs(A)
      |          ~~~^~~
In file included from /usr/include/c++/14/cstdlib:79,
                 from /usr/include/x86_64-linux-gnu/c++/14/bits/stdc++.h:42:
/usr/include/stdlib.h:980:12: note: candidate: 'int abs(int)'
  980 | extern int abs (int __x) __THROW __attribute__ ((__const__)) __wur;
      |            ^~~
/usr/include/stdlib.h:980:21: note:   no known conversion for argument 1 from 'std::vector<long long int>' to 'int'
  980 | extern int abs (int __x) __THROW __attribute__ ((__const__)) __wur;
      |                 ~~~~^~~
In file included from /usr/include/c++/14/cstdlib:81:
/usr/include/c++/14/bits/std_abs.h:137:3: note: candidate: 'constexpr __float128 std::abs(__float128)'
  137 |   abs(__float128 __x)
      |   ^~~
/usr/include/c++/14/bits/std_abs.h:137:18: note:   no known conversion for argument 1 from 'std::vector<long long int>' to '__float128'
  137 |   abs(__float128 __x)
      |       ~~~~~~~~~~~^~~
/usr/include/c++/14/bits/std_abs.h:85:3: note: candidate: 'constexpr __int128 std::abs(__int128)'
   85 |   abs(__GLIBCXX_TYPE_INT_N_0 __x) { return __x >= 0 ? __x : -__x; }
      |   ^~~
/usr/include/c++/14/bits/std_abs.h:85:30: note:   no known conversion for argument 1 from 'std::vector<long long int>' to '__int128'
   85 |   abs(__GLIBCXX_TYPE_INT_N_0 __x) { return __x >= 0 ? __x : -__x; }
      |                              ^
/usr/include/c++/14/bits/std_abs.h:79:3: note: candidate: 'constexpr long double std::abs(long double)'
   79 |   abs(long double __x)
      |   ^~~
/usr/include/c++/14/bits/std_abs.h:79:19: note:   no known conversion for argument 1 from 'std::vector<long long int>' to 'long double'
   79 |   abs(long double __x)
      |       ~~~~~~~~~~~~^~~
/usr/include/c++/14/bits/std_abs.h:75:3: note: candidate: 'constexpr float std::abs(float)'
   75 |   abs(float __x)
      |   ^~~
/usr/include/c++/14/bits/std_abs.h:75:13: note:   no known conversion for argument 1 from 'std::vector<long long int>' to 'float'
   75 |   abs(float __x)
      |       ~~~~~~^~~
/usr/include/c++/14/bits/std_abs.h:71:3: note: candidate: 'constexpr double std::abs(double)'
   71 |   abs(double __x)
      |   ^~~
/usr/include/c++/14/bits/std_abs.h:71:14: note:   no known conversion for argument 1 from 'std::vector<long long int>' to 'double'
   71 |   abs(double __x)
      |       ~~~~~~~^~~
/usr/include/c++/14/bits/std_abs.h:61:3: note: candidate: 'long long int std::abs(long long int)'
   61 |   abs(long long __x) { return __builtin_llabs (__x); }
      |   ^~~
/usr/include/c++/14/bits/std_abs.h:61:17: note:   no known conversion for argument 1 from 'std::vector<long long int>' to 'long long int'
   61 |   abs(long long __x) { return __builtin_llabs (__x); }
      |       ~~~~~~~~~~^~~
/usr/include/c++/14/bits/std_abs.h:56:3: note: candidate: 'long int std::abs(long int)'
   56 |   abs(long __i) { return __builtin_labs(__i); }
      |   ^~~
/usr/include/c++/14/bits/std_abs.h:56:12: note:   no known conversion for argument 1 from 'std::vector<long long int>' to 'long int'
   56 |   abs(long __i) { return __builtin_labs(__i); }
      |       ~~~~~^~~