Language: C++

#include<bits/stdc++.h>
using namespace std;
#define rep(i,n) for(int i=0; i<n; i++)

int main(){
    unsigned long long int N, x; cin >> N >> x;
    unsigned long long int a[N]; rep(i,N) cin >> a[i];

    unsigned long long int cnt = 0;
    rep(i,N-1){
        int b = a[i+1] + a[i];
        if(i % 2 == 0){
            if(b > x){
                int tmp = a[i+1];
                a[i+1] = max(a[i+1]-(b-x), 0);
                cnt += tmp - a[i+1];
                b = a[i+1] + a[i];
            }
            if(b > x){
                a[i] = a[i]-(b-x);
                cnt += b-x;
            }
        }
        else{
            if(b > x){
                int tmp = a[i];
                a[i] = max(a[i]-(b-x), 0);
                cnt += tmp - a[i];
                b = a[i+1] + a[i];
            }
            if(b > x){
                a[i+1] = a[i+1]-(b-x);
                cnt += b-x;
            }
        }
    }
    cout << cnt << endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:15:29: error: no matching function for call to 'max(long long unsigned int, int)'
   15 |                 a[i+1] = max(a[i+1]-(b-x), 0);
      |                          ~~~^~~~~~~~~~~~~~~~~
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:15:29: note:   deduced conflicting types for parameter 'const _Tp' ('long long unsigned int' and 'int')
   15 |                 a[i+1] = max(a[i+1]-(b-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:15:29: note:   mismatched types 'std::initializer_list<_Tp>' and 'long long unsigned int'
   15 |                 a[i+1] = max(a[i+1]-(b-x), 0);
      |                          ~~~^~~~~~~~~~~~~~~~~
a.cc:27:27: error: no matching function for call to 'max(long long unsigned int, int)'
   27 |                 a[i] = max(a[i]-(b-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:27:27: note:   deduced conflicting types for parameter 'const _Tp' ('long long unsigned int' and 'int')
   27 |                 a[i] = max(a[i]-(b-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:27:27: note:   mismatched types 'std::initializer_list<_Tp>' and 'long long unsigned int'
   27 |                 a[i] = max(a[i]-(b-x), 0);
      |                        ~~~^~~~~~~~~~~~~~~