Language: C++

#include <iostream>
#include <algorithm>
#include <vector>
#include <string>
#include <queue>
#include <cstring>
#include <cmath>

using std::cin;
using std::cout;
using std::cerr;
using std::endl;

using ll = long long;

int main() {
  int N, Z, W;
  std::vector<ll> a;

  cin >> N >> Z >> W;
  a.resize(N);
  for (int i = 0; i < N; ++i) {
    cin >> a[i];
  }

  int ans = llabs(a[N - 1] - W);
  if (N >= 2) {
    ans = std::max(ans, llabs(a[N - 2] - a[N - 1]));
  }
  if (N >= 3) ans = std::max(ans, llabs(a[N - 3] - (llabs(a[N - 2] - a[N - 3]) < llabs(a[N - 1] - a[N - 3]) ? a[N - 2] : a[N - 1])));

  cout << ans << endl;

  return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:28:19: error: no matching function for call to 'max(int&, long long int)'
   28 |     ans = std::max(ans, llabs(a[N - 2] - a[N - 1]));
      |           ~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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: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:28:19: note:   deduced conflicting types for parameter 'const _Tp' ('int' and 'long long int')
   28 |     ans = std::max(ans, llabs(a[N - 2] - a[N - 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,
                 from a.cc:2:
/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:28:19: note:   mismatched types 'std::initializer_list<_Tp>' and 'int'
   28 |     ans = std::max(ans, llabs(a[N - 2] - a[N - 1]));
      |           ~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
a.cc:30:29: error: no matching function for call to 'max(int&, long long int)'
   30 |   if (N >= 3) ans = std::max(ans, llabs(a[N - 3] - (llabs(a[N - 2] - a[N - 3]) < llabs(a[N - 1] - a[N - 3]) ? a[N - 2] : a[N - 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:30:29: note:   deduced conflicting types for parameter 'const _Tp' ('int' and 'long long int')
   30 |   if (N >= 3) ans = std::max(ans, llabs(a[N - 3] - (llabs(a[N - 2] - a[N - 3]) < llabs(a[N - 1] - a[N - 3]) ? a[N - 2] : a[N - 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
/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:30:29: note:   mismatched types 'std::initializer_list<_Tp>' and 'int'
   30 |   if (N >= 3) ans = std::max(ans, llabs(a[N - 3] - (llabs(a[N - 2] - a[N - 3]) < llabs(a[N - 1] - a[N - 3]) ? a[N - 2] : a[N - 1])));
      |                     ~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~