Language: C++

#include "bits/stdc++.h"
#define in std::cin
#define out std::cout
#define rep(i,N) for(int i=0;i<N;++i)
typedef long long int LL;

LL N, Z, W;
std::vector<LL>a;

int main()
{
	in >> N >> Z >> W;
	rep(i, N)
	{
		LL tmp;
		in >> tmp;
		a.push_back(tmp);
	}
	if (N == 1) { out << abs(a[0] - W) << std::endl; }
	else
	{
		LL res = 0;
		rep(i, N - 1) { res = std::max(res, abs(a[N - 1] - a[i])); }
		out << std::max(abs(a[N - 1] - W), res) << std::endl;
	}
	return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:23:47: error: no matching function for call to 'max(LL&, int)'
   23 |                 rep(i, N - 1) { res = std::max(res, abs(a[N - 1] - a[i])); }
      |                                       ~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~
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:23:47: note:   deduced conflicting types for parameter 'const _Tp' ('long long int' and 'int')
   23 |                 rep(i, N - 1) { res = std::max(res, abs(a[N - 1] - a[i])); }
      |                                       ~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~
/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:23:47: note:   mismatched types 'std::initializer_list<_Tp>' and 'long long int'
   23 |                 rep(i, N - 1) { res = std::max(res, abs(a[N - 1] - a[i])); }
      |                                       ~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~
a.cc:24:32: error: no matching function for call to 'max(int, LL&)'
   24 |                 out << std::max(abs(a[N - 1] - W), res) << std::endl;
      |                        ~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
/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:24:32: note:   deduced conflicting types for parameter 'const _Tp' ('int' and 'LL' {aka 'long long int'})
   24 |                 out << std::max(abs(a[N - 1] - W), res) << std::endl;
      |                        ~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
/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
/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:24:32: note:   mismatched types 'std::initializer_list<_Tp>' and 'int'
   24 |                 out << std::max(abs(a[N - 1] - W), res) << std::endl;
      |                        ~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~