Submission #1080910

#	Time	Username	Problem	Language	Result	Execution time	Memory
1080910		juicy	Sails (IOI07_sails)	C++17	100 / 100	43 ms	4692 KiB

sails

#include <bits/stdc++.h>

using namespace std;

#ifdef LOCAL
#include "debug.h"
#else
#define debug(...) 42
#endif

const int N = 1e5 + 5;

int n;
int dif[N];
set<int> st;

void add(int i, int x) {
  dif[i] += x;
  if (dif[i]) {
    st.insert(i);
  } else {
    st.erase(i);
  }
}

void upd(int i, int j) {
  add(i, 1);
  add(j + 1, -1);
}

int main() {
  ios::sync_with_stdio(false); cin.tie(nullptr);
  
  cin >> n;
  vector<array<int, 2>> a(n);
  for (auto &x : a) {
    cin >> x[0] >> x[1];
  }
  sort(a.begin(), a.end());
  int l = a.back()[0];
  st.insert(1);
  st.insert(l + 1);
  for (auto [h, k] : a) {
    auto it = st.upper_bound({h - k + 1});
    int l = *prev(it), r = *it - 1;
    if (r < h) {
      upd(r + 1, h);
      k -= h - r;
    }
    if (k > 0) {
      upd(l, l + k - 1);
    }
  }
  long long res = 0;
  int cnt = 0;
  for (int i = 1; i <= l; ++i) {
    cnt += dif[i];
    res += (long long) cnt * (cnt - 1) / 2;
  }
  cout << res;
  return 0;
}

• Subtask 1: 5 / 5
• Subtask 2: 10 / 10
• Subtask 3: 10 / 10
• Subtask 4: 5 / 5
• Subtask 5: 10 / 10
• Subtask 6: 10 / 10
• Subtask 7: 10 / 10
• Subtask 8: 10 / 10
• Subtask 9: 10 / 10
• Subtask 10: 10 / 10
• Subtask 11: 10 / 10