Language: C++

#include <algorithm>
#include <cstdio>
#include <iostream>
#include <map>
#include <math.h>
#include <queue>
#include <set>
#include <sstream>
#include <stack>
#include <string>
#include <vector>
using namespace std;

#define ll long long
#define INF (1 << 30)
#define INFLL (1LL << 60)

#define FOR(i,a,b) for(ll i = (a);i<(b);i++)
#define REP(i,a) FOR(i,0,(a))
#define MP make_pair

int main() {
	ll n, a[100010] = {}, x;
	cin >> n >> x;
	REP(i, n){
		cin >> a[i];
	}

	ll ans = 0;
	REP(i, n){
		if(a[i] > x){
			ans += a[i] - x;
			a[i] = x;
		}
	}

	ll ans1 = 0, ans2 = 0;

	REP(i, n){
		ll maxLR = a[i + 1];
		if(i != 0){
			maxLR = max(maxLR, a[i - 1]);
		}
		if(i % 2 == 0){
			if(a[i] + maxLR > x){
				ans1 += max(a[i] + maxLR - x, 0);
			}
		}else{
			if(a[i] + maxLR > x){
				ans2 += max(a[i] + maxLR - x, 0);
			}
		}
	}

	ans += min(ans1, ans2);

	cout << ans << endl;
	return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:46:44: error: no matching function for call to 'max(long long int, int)'
   46 |                                 ans1 += max(a[i] + maxLR - x, 0);
      |                                         ~~~^~~~~~~~~~~~~~~~~~~~~
In file included from /usr/include/c++/14/algorithm:60,
                 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:46:44: note:   deduced conflicting types for parameter 'const _Tp' ('long long int' and 'int')
   46 |                                 ans1 += max(a[i] + maxLR - x, 0);
      |                                         ~~~^~~~~~~~~~~~~~~~~~~~~
/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:46:44: note:   mismatched types 'std::initializer_list<_Tp>' and 'long long int'
   46 |                                 ans1 += max(a[i] + maxLR - x, 0);
      |                                         ~~~^~~~~~~~~~~~~~~~~~~~~
a.cc:50:44: error: no matching function for call to 'max(long long int, int)'
   50 |                                 ans2 += max(a[i] + maxLR - x, 0);
      |                                         ~~~^~~~~~~~~~~~~~~~~~~~~
/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:50:44: note:   deduced conflicting types for parameter 'const _Tp' ('long long int' and 'int')
   50 |                                 ans2 += max(a[i] + maxLR - x, 0);
      |                                         ~~~^~~~~~~~~~~~~~~~~~~~~
/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:50:44: note:   mismatched types 'std::initializer_list<_Tp>' and 'long long int'
   50 |                                 ans2 += max(a[i] + maxLR - x, 0);
      |                                         ~~~^~~~~~~~~~~~~~~~~~~~~