Language: C++

#include <iostream>
#include <cmath>
#include <cstring>
#include <algorithm>
#include <memory.h>
#include <fstream>
 
using namespace std;
 
const int N = 100005;
int n, a[N], dp[N][2];
 
int rec(int i, bool p)
{
	if (i == n - 1) return 0;
 
	int &dp = ::dp[i][p];
 
	if (dp != -1) return dp;
 
	dp = (int)1e9;
 
	if (p == 1)
	{
		return dp = rec(i + 1, 0);
	}
 
	return dp = min(rec(i + 1, 0) + abs(a[i] - a[i + 1]), (i + 2 > N ? 1e9 : 0) + rec(i + 1, 1) + abs(a[i] - a[i + 2]));
}
 
int main()
{
 
	cin >> n;
	memset(dp, -1, sizeof(dp));
	for (int i = 0; i < n; i++)
	{
		scanf("%d", a + i);
	}
 
	printf("%d", rec(0, 0));
}

Compiler output:
a.cc: In function 'int rec(int, bool)':
a.cc:28:24: error: no matching function for call to 'min(int, double)'
   28 |         return dp = min(rec(i + 1, 0) + abs(a[i] - a[i + 1]), (i + 2 > N ? 1e9 : 0) + rec(i + 1, 1) + abs(a[i] - a[i + 2]));
      |                     ~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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:233:5: note: candidate: 'template<class _Tp> constexpr const _Tp& std::min(const _Tp&, const _Tp&)'
  233 |     min(const _Tp& __a, const _Tp& __b)
      |     ^~~
/usr/include/c++/14/bits/stl_algobase.h:233:5: note:   template argument deduction/substitution failed:
a.cc:28:24: note:   deduced conflicting types for parameter 'const _Tp' ('int' and 'double')
   28 |         return dp = min(rec(i + 1, 0) + abs(a[i] - a[i + 1]), (i + 2 > N ? 1e9 : 0) + rec(i + 1, 1) + abs(a[i] - a[i + 2]));
      |                     ~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/usr/include/c++/14/bits/stl_algobase.h:281:5: note: candidate: 'template<class _Tp, class _Compare> constexpr const _Tp& std::min(const _Tp&, const _Tp&, _Compare)'
  281 |     min(const _Tp& __a, const _Tp& __b, _Compare __comp)
      |     ^~~
/usr/include/c++/14/bits/stl_algobase.h:281:5: note:   candidate expects 3 arguments, 2 provided
In file included from /usr/include/c++/14/algorithm:61,
                 from a.cc:4:
/usr/include/c++/14/bits/stl_algo.h:5686:5: note: candidate: 'template<class _Tp> constexpr _Tp std::min(initializer_list<_Tp>)'
 5686 |     min(initializer_list<_Tp> __l)
      |     ^~~
/usr/include/c++/14/bits/stl_algo.h:5686:5: note:   candidate expects 1 argument, 2 provided
/usr/include/c++/14/bits/stl_algo.h:5696:5: note: candidate: 'template<class _Tp, class _Compare> constexpr _Tp std::min(initializer_list<_Tp>, _Compare)'
 5696 |     min(initializer_list<_Tp> __l, _Compare __comp)
      |     ^~~
/usr/include/c++/14/bits/stl_algo.h:5696:5: note:   template argument deduction/substitution failed:
a.cc:28:24: note:   mismatched types 'std::initializer_list<_Tp>' and 'int'
   28 |         return dp = min(rec(i + 1, 0) + abs(a[i] - a[i + 1]), (i + 2 > N ? 1e9 : 0) + rec(i + 1, 1) + abs(a[i] - a[i + 2]));
      |                     ~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~