Submission #873763

#	Time	Username	Problem	Language	Result	Execution time	Memory
873763		MilosMilutinovic	Schools (IZhO13_school)	C++14	100 / 100	213 ms	25560 KiB

school

#include <bits/stdc++.h>

using namespace std;

int main() {
  ios::sync_with_stdio(false);
  cin.tie(0);
  int n, m, s;
  cin >> n >> m >> s;
  vector<int> a(n), b(n);
  for (int i = 0; i < n; i++) {
    cin >> a[i] >> b[i];
  }
  vector<int> order(n);
  iota(order.begin(), order.end(), 0);
  sort(order.begin(), order.end(), [&](int i, int j) {
    return a[i] > a[j] || (a[i] == a[j] && b[i] < b[j]);
  });
  vector<int> new_a(n), new_b(n);
  for (int i = 0; i < n; i++) {
    new_a[i] = a[order[i]];
    new_b[i] = b[order[i]];
  }
  a = new_a;
  b = new_b;
  order.clear();
  for (int i = m; i < n; i++) {
    order.push_back(i);
  }
  sort(order.begin(), order.end(), [&](int i, int j) {
    return b[i] > b[j];
  });
  long long ans = 0;
  for (int i = 0; i < m; i++) {
    ans += a[i];
  }
  for (int i = 0; i < s; i++) {
    ans += b[order[i]];
  }
  multiset<int> L;
  for (int i = 0; i < m; i++) {
    L.insert(-a[i] + b[i]);
  }
  multiset<pair<int, int>> R;
  multiset<int> Ra;
  multiset<pair<int, int>> Rab;
  for (int i = 0; i < s; i++) {
    R.emplace(-b[order[i]], order[i]);
    Rab.emplace(-b[order[i]] + a[order[i]], order[i]);
  }
  for (int i = s; i < (int) order.size(); i++) {
    Ra.insert(a[order[i]]);
  }
  long long res = ans;
  while (!L.empty() && !R.empty()) {
    assert(!Rab.empty());
    res += *prev(L.end());
    L.erase(prev(L.end()));
    if (Ra.empty() || prev(Rab.end())->first > prev(R.end())->first + *prev(Ra.end())) {
      auto it = prev(Rab.end());
      res += it->first;
      int i = it->second;
      R.erase(R.find({-b[i], i}));
      Rab.erase(it);
    } else {
      {
        auto it = prev(R.end());
        res += it->first;
        int i = it->second;
        R.erase(R.find({-b[i], i}));
        Rab.erase(Rab.find({-b[i] + a[i], i}));
        Ra.insert(a[i]);
      }
      {
        auto it = prev(Ra.end());
        res += *it;
        Ra.erase(it);
      }
    }
    ans = max(ans, res);
  }
  cout << ans << '\n';
  return 0;
}

• Subtask 1: 100 / 100