Language: C++

#include <bits/stdc++.h>
using namespace std;
#define REP(i, n) FOR(i, 0, (n))
#define FOR(i, a, b) for(int i=(a); i<(b); i++)
#define LAR(a, b) ((a)=max((a),(b)))
#define SML(a, b) ((a)=min((a),(b)))
using ll = long long;
using ld = long double;
using vi = vector<int>;
using vl = vector<ll>;
using pii = pair<int, int>;
using vpii = vector<pair<int, int>>;
template<typename T>
using pque = priority_queue<T, vector<T>, greater<T>>;
#define PB push_back
#define EB emplace_back
#define MP make_pair
#define ALL(a) (a).begin(), (a).end()
#ifdef LOCAL_DEBUG
#define DEBUG(...) printf(__VA_ARGS__)
#else
#define DEBUG(...)
#endif

using pll = pair<ll, ll>;
vector<pll> v;
queue<pll> que;

int main(){
	int n; ll d, a; scanf("%d%lld%lld", &n, &d, &a);
	REP(i, n){
		ll x, h; scanf("%lld%lld", &x, &h);
		v.EB(x, h);
	}
	sort(ALL(v));
	ll m = 0, ans = 0;
	for(auto &p : v){
		ll x = p.first, h = p.second;
		while(que.size() && que.front().first < x) {
			m -= que.front().second;
			que.pop();
		}
		h -= m;
		ll cnt = (max(h, 0) + a - 1) / a;
		ans += cnt;
		m += cnt * a;
		que.emplace(x + 2 * d, cnt * a);
	}
	printf("%lld\n", ans);
}


Compiler output:
a.cc: In function 'int main()':
a.cc:44:30: error: no matching function for call to 'max(ll&, int)'
   44 |                 ll cnt = (max(h, 0) + a - 1) / a;
      |                           ~~~^~~~~~
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:44:30: note:   deduced conflicting types for parameter 'const _Tp' ('long long int' and 'int')
   44 |                 ll cnt = (max(h, 0) + a - 1) / a;
      |                           ~~~^~~~~~
/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:44:30: note:   mismatched types 'std::initializer_list<_Tp>' and 'long long int'
   44 |                 ll cnt = (max(h, 0) + a - 1) / a;
      |                           ~~~^~~~~~