Language: C++

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

signed main(void)
{
	ll n, cnt;
	cin >> n;
	ll a[n];
	rep(i, n) cin >> a[i];
	cnt = 0;
	for (int i = 1; i < n; i++)
	{
		cnt += max(a[i - 1] - a[i], 0);
		a[i] += max(a[i - 1] - a[i], 0);
	}
	cout << cnt << endl;
	return 0;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:16:27: error: no matching function for call to 'max(ll, int)'
   16 |                 cnt += max(a[i - 1] - a[i], 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:16:27: note:   deduced conflicting types for parameter 'const _Tp' ('long long int' and 'int')
   16 |                 cnt += max(a[i - 1] - a[i], 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:16:27: note:   mismatched types 'std::initializer_list<_Tp>' and 'long long int'
   16 |                 cnt += max(a[i - 1] - a[i], 0);
      |                        ~~~^~~~~~~~~~~~~~~~~~~~
a.cc:17:28: error: no matching function for call to 'max(ll, int)'
   17 |                 a[i] += max(a[i - 1] - a[i], 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:17:28: note:   deduced conflicting types for parameter 'const _Tp' ('long long int' and 'int')
   17 |                 a[i] += max(a[i - 1] - a[i], 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:17:28: note:   mismatched types 'std::initializer_list<_Tp>' and 'long long int'
   17 |                 a[i] += max(a[i - 1] - a[i], 0);
      |                         ~~~^~~~~~~~~~~~~~~~~~~~