Language: C++

#include <bits/stdc++.h>
#define rep(i, n) for (int i=0; i<(int)(n); i++)
#define all(v) v.begin(), v.end()
using namespace std;
using ll = long long;
using Graph = vector<vector<int>>;
const ll MOD = 1000000007;
const ll INF = 9999999999;
template<class T> inline bool chmin(T& a, T b){if (a>b){a = b; return true;}return false;}
template<class T> inline bool chmax(T& a, T b){if (a<b){a = b; return true;}return false;}
template<class T> inline T powerM(T a,T b){if (b==0) return 1;
  T tmp = powerM(a,b/2); if (b%2==0) return tmp*tmp%MOD; else return tmp*tmp%MOD*a%MOD; }

int main() {
  ll N,D,A; cin >>N >>D >>A;
  // 敵の数、爆弾の片側範囲、爆弾の攻撃力
  vector<pair<ll,ll>> enemy(N);
  rep(i,N) cin >>enemy.at(i).first >>enemy.at(i).second;
  // 爆弾は片方の座標を指定するとそこから2D離れた地点まで爆撃できる。
  // 爆弾を座標xを指定して[x,x+2D]を爆撃するように考えれば、端っこのヤツから順に爆撃すればいい。
  sort(all(enemy));

  queue<ll> X,T;
  ll ans = 0;
  for (int i=0; i<N; i++){
    while (!X.empty() || X.front() <= enemy.at(i).first - 2 * D) {
      X.pop(); T.pop();
    }
    for (auto t : T){
      if (enemy.at(i).second <= 0) break;
      enemy.at(i).second -= t * A;
    }
    if (enemy.at(i).second > 0){
      ll times = (enemy.at(i).second + A-1) / A;
      ans += times;
      X.push(enemy.at(i).first);
      T.push(times);
    }
  }

  cout <<ans <<endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:29:19: error: no matching function for call to 'begin(std::queue<long long int>&)'
   29 |     for (auto t : T){
      |                   ^
In file included from /usr/include/c++/14/bits/algorithmfwd.h:39,
                 from /usr/include/c++/14/bits/stl_algo.h:59,
                 from /usr/include/c++/14/algorithm:61,
                 from /usr/include/x86_64-linux-gnu/c++/14/bits/stdc++.h:51,
                 from a.cc:1:
/usr/include/c++/14/initializer_list:88:5: note: candidate: 'template<class _Tp> constexpr const _Tp* std::begin(initializer_list<_Tp>)'
   88 |     begin(initializer_list<_Tp> __ils) noexcept
      |     ^~~~~
/usr/include/c++/14/initializer_list:88:5: note:   template argument deduction/substitution failed:
a.cc:29:19: note:   'std::queue<long long int>' is not derived from 'std::initializer_list<_Tp>'
   29 |     for (auto t : T){
      |                   ^
In file included from /usr/include/c++/14/string:53,
                 from /usr/include/c++/14/bitset:52,
                 from /usr/include/x86_64-linux-gnu/c++/14/bits/stdc++.h:52:
/usr/include/c++/14/bits/range_access.h:52:5: note: candidate: 'template<class _Container> constexpr decltype (__cont.begin()) std::begin(_Container&)'
   52 |     begin(_Container& __cont) -> decltype(__cont.begin())
      |     ^~~~~
/usr/include/c++/14/bits/range_access.h:52:5: note:   template argument deduction/substitution failed:
/usr/include/c++/14/bits/range_access.h: In substitution of 'template<class _Container> constexpr decltype (__cont.begin()) std::begin(_Container&) [with _Container = std::queue<long long int>]':
a.cc:29:19:   required from here
   29 |     for (auto t : T){
      |                   ^
/usr/include/c++/14/bits/range_access.h:52:50: error: 'class std::queue<long long int>' has no member named 'begin'
   52 |     begin(_Container& __cont) -> decltype(__cont.begin())
      |                                           ~~~~~~~^~~~~
/usr/include/c++/14/bits/range_access.h:63:5: note: candidate: 'template<class _Container> constexpr decltype (__cont.begin()) std::begin(const _Container&)'
   63 |     begin(const _Container& __cont) -> decltype(__cont.begin())
      |     ^~~~~
/usr/include/c++/14/bits/range_access.h:63:5: note:   template argument deduction/substitution failed:
/usr/include/c++/14/bits/range_access.h: In substitution of 'template<class _Container> constexpr decltype (__cont.begin()) std::begin(const _Container&) [with _Container = std::queue<long long int>]':
a.cc:29:19:   required from here
   29 |     for (auto t : T){
      |                   ^
/usr/include/c++/14/bits/range_access.h:63:56: error: 'const class std::queue<long long int>' has no member named 'begin'
   63 |     begin(const _Container& __cont) -> decltype(__cont.begin())
      |                                                 ~~~~~~~^~~~~
/usr/include/c++/14/bits/range_access.h:95:5: note: candidate: 'template<class _Tp, long unsigned int _Nm> constexpr _Tp* std::begin(_Tp (&)[_Nm])'
   95 |     begin(_Tp (&__arr)[_Nm]) noexcept
      |     ^~~~~
/usr/include/c++/14/bits/range_access.h:95:5: note:   template argument deduction/substitution failed:
a.cc:29:19: note:   mismatched types '_Tp [_Nm]' and 'std::queue<long long int>'
   29 |     for (auto t : T){
      |                   ^
In file included from /usr/include/x86_64-linux-gnu/c++/14/bits/stdc++.h:166:
/usr/include/c++/14/valarray:1227:5: note: candidate: 'template<class _Tp> _Tp* std::begin(valarray<_Tp>&)'
 1227 |     begin(valarray<_Tp>& __va) noexcept
      |     ^~~~~
/usr/include/c++/14/valarray:1227:5: note:   template argument deduction/substitution failed:
a.cc:29:19: note:   'std::queue<long long int>' is not derived from 'std::valarray<_Tp>'
   29 |     for (auto t : T){
      |                   ^
/usr/include/c++/14/valarray:1238:5: note: candidate: 'template<class _Tp> const _Tp* std::begin(const valarray<_Tp>&)'
 1238 |     begin(const valarray<_Tp>& __va) noexcept
      |     ^~~~~
/usr/include/c++/14/valarray:1238:5: note:   template argument deduction/substitution failed:
a.cc:29:19: note:   'std::queue<long long int>' is not derived from 'const std::valarray<_Tp>'
   29 |     for (auto t : T){
      |                   ^
a.cc:29:19: error: no matching function for call to 'end(std::queue<long long int>&)'
/usr/include/c++/14/initializer_list:99:5: note: candidate: 'template<class _Tp> constexpr const _Tp* std::end(initializer_list<_Tp>)'
   99 |     end(initializer_list<_Tp> __ils) noexcept
      |     ^~~
/usr/include/c++/14/initializer_list:99:5: note:   template argument deduction/substitution failed:
a.cc:29:19: note:   'std::queue<long long int>' is not derived from 'std::initializer_list<_Tp>'
   29 |     for (auto t : T){
      |                   ^
/usr/include/c++/14/bits/range_access.h:74:5: note: candidate: 'template<class _Container> constexpr decltype (__cont.end()) std::end(_Container&)'
   74 |     end(_Container& __cont) -> decltype(__cont.end())
      |     ^~~
/usr/include/c++/14/bits/range_access.h:74:5: note:   template argument deduction/substitution failed:
/usr/include/c++/14/bits/range_access.h: In substitution of 'template<class _Container> constexpr decltype (__cont.end()) std::end(_Container&) [with _Container = std::queue<long long int>]':
a.cc:29:19:   required from here
   29 |     for (auto t : T){
      |                   ^
/usr/include/c++/14/bits/range_access.h:74:48: error: 'class std::queue<long long int>' has no member named 'end'
   74 |     end(_Container& __cont) -> decltype(__cont.end())
      |                                         ~~~~~~~^~~
/usr/include/c++/14/bits/range_access.h:85:5: note: candidate: 'template<class _Container> constexpr decltype (__cont.end()) std::end(const _Container&)'
   85 |     end(const _Container& __cont) -> decltype(__cont.end())
      |     ^~~
/usr/include/c++/14/bits/range_access.h:85:5: note:   template argument deduction/substitution failed:
/usr/include/c++/14/bits/range_access.h: In substitution of 'template<class _Container> constexpr decltype (__cont.end()) std::end(const _Container&) [with _Container = std::queue<long long int>]':
a.cc:29:19:   required from here
   29 |     for (auto t : T){
      |                   ^
/usr/include/c++/14/bits/range_access.h:85:54: error: 'const class std::queue<long long int>' has no member named 'end'
   85 |     end(const _Container& __cont) -> decltype(__cont.end())
      |                                               ~~~~~~~^~~
/usr/include/c++/14/bits/range_access.h:106:5: note: candidate: 'template<class _Tp, long unsigned int _Nm> constexpr _Tp* std::end(_Tp (&)[_Nm])'
  106 |     end(_Tp (&__arr)[_Nm]) noexcept
      |     ^~~
/usr/include/c++/14/bits/range_access.h:106:5: note:   template argument deduction/substitution failed:
a.cc:29:19: note:   mismatched types '_Tp [_Nm]' and 'std::queue<long long int>'
   29 |     for (auto t : T){
      |                   ^
/usr/include/c++/14/valarray:1249:5: note: candidate: 'template<class _Tp> _Tp* std::end(valarray<_Tp>&)'
 1249 |     end(valarray<_Tp>& __va) noexcept
      |     ^~~
/usr/include/c++/14/valarray:1249:5: note:   template argument deduction/substitution failed:
a.cc:29:19: note:   'std::queue<long long int>' is not derived from 'std::valarray<_Tp>'
   29 |     for (auto t : T){
      |                   ^
/usr/include/c++/14/valarray:1265:5: note: candidate: 'template<class _Tp> const _Tp* std::end(const valarray<_Tp>&)'
 1265 |     end(const valarray<_Tp>& __va) noexcept
      |     ^~~
/usr/include/c++/14/valarray:1265:5: note:   template argument deduction/substitution failed:
a.cc:29:19: note:   'std::queue<long long int>' is not derived from 'const std::valarray<_Tp>'
   29 |     for (auto t : T){
      |                   ^