Language: C++

#include <bits/stdc++.h>
//#include <ext/pb_ds/assoc_container.hpp>
//#include <ext/pb_ds/tree_policy.hpp>
#define fi first
#define se second
#define re return
#define pb emplace_back
#define em emplace
#define er erase
#define all(x) (x).begin(), (x).end()
#define in(v); { for (auto &i : v) cin >> i; }
#define out(v); { for (auto &i : v) cout << i << ' '; cout << endl; }

#define int long long

using namespace std;
//using namespace __gnu_cxx;
//using namespace __gnu_pbds;

const long long INFll = 1e18;



void solve() {
    int n, d, a;
    cin >> n >> d >> a;
    vector <pair <int, int>> v(n);
    for (int i = 0; i < n; i++)
        cin >> v[i].fi >> v[i].se;
    sort(all(v));
    int il = 0, ifar = 0;
    int psh = 0;
    vector <int> u(n);
    while (il < n) {
        while (v[ifar].fi + 2 * d < v[il].fi) {
            psh -= u[ifar];
            ifar++;
        }

        u[il] = max(v[il].se / a + (v[il].se % a != 0) - psh, 0);
        psh += u[il];
        il++;

    }
    cout << accumulate(all(u), 0ll);
}

signed main() {
    ios_base::sync_with_stdio(false);
    cin.tie(0); cout.tie(0);

    solve();
}


Compiler output:
a.cc: In function 'void solve()':
a.cc:40:20: error: no matching function for call to 'max(long long int, int)'
   40 |         u[il] = max(v[il].se / a + (v[il].se % a != 0) - psh, 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:40:20: note:   deduced conflicting types for parameter 'const _Tp' ('long long int' and 'int')
   40 |         u[il] = max(v[il].se / a + (v[il].se % a != 0) - psh, 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:40:20: note:   mismatched types 'std::initializer_list<_Tp>' and 'long long int'
   40 |         u[il] = max(v[il].se / a + (v[il].se % a != 0) - psh, 0);
      |                 ~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~