Submission #143627

#	Time	Username	Problem	Language	Result	Execution time	Memory
143627		Kanon	Rectangles (IOI19_rect)	C++14	50 / 100	5021 ms	736244 KiB

rect

#include <bits/stdc++.h>

using namespace std;

#define range(i, m, n) for(int i = m; i < n; i++)
#define husk(i, m, n) for(int i = m; i > n; i--)

struct sp {
  vector<int> st;
  unordered_set<int> alive;
  sp(){};
  void add(int ss) {
    st.push_back(ss);
    alive.insert(ss);
  }
  int pos(int ss) {
    return upper_bound(st.begin(), st.end(), ss, greater<int>()) - st.begin();
  }
  sp operator ^ (const sp &a) const {
    sp res;
    for(auto i : (a.st.size() < st.size() ? a.st : st)) {
      if((a.st.size() < st.size() ? alive : a.alive).count(i)) res.add(i);
    }
    return res;
  }
};

long long count_rectangles(vector<vector<int>> a) {
  int m = a.front().size();
  int n = a.size();
  auto pos = [&] (vector<int> cur) {
    int s = cur.size();
    vector<pair<int, int>> res;
    vector<int> st;
    range(i, 0, s) {
      while(st.size() && cur[st.back()] <= cur[i]) {
        if(st.back() < i - 1) res.emplace_back(st.back() + 1, i - 1);
        int b = st.back();
        st.pop_back();
        if(cur[b] == cur[i]) goto A;
      }
      if(st.size() && st.back() < i - 1) res.emplace_back(st.back() + 1, i - 1);
      A:;
      st.push_back(i);
    }
    return res;
  };
  vector<vector<sp>> cur(n, vector<sp>(m));
  range(i, 0, n) {
    vector<pair<int, int>> ss = pos(a[i]);
    for(auto j : ss) {
      cur[i][j.second].add(j.first);
    }
  }
  long long res = 0;
  vector<vector<pair<int, int>>> to(n, vector<pair<int, int>> (n, make_pair(-2, -2)));
  range(i, 0, m) {
    vector<int> psy(n);
    range(j, 0, n) psy[j] = a[j][i];
    vector<pair<int, int>> ss = pos(psy);
    int sz = ss.size();
    vector<sp> dp(sz);
    vector<int> pr(n, -1);
    range(j, 0, sz) {
      int p = ss[j].second;
      dp[j] = cur[p][i];
      while(p >= ss[j].first) {
        if(~pr[p]) {
          dp[j] = dp[j] ^ dp[pr[p]];
          p = ss[pr[p]].first - 1;
        } else {
          dp[j] = dp[j] ^ cur[p][i];
          p--;
        }
      }
      pr[ss[j].second] = j;
      int l = to[ss[j].first][ss[j].second].second == i - 1 ? to[ss[j].first][ss[j].second].first : i;
      if(l == i) to[ss[j].first][ss[j].second] = make_pair(i, i);
      to[ss[j].first][ss[j].second].second = i;
      res += dp[j].pos(l);
    }
  }
  return res;
}

• Subtask 1: 8 / 8
• Subtask 2: 7 / 7
• Subtask 3: 12 / 12
• Subtask 4: 0 / 22
• Subtask 5: 10 / 10
• Subtask 6: 13 / 13
• Subtask 7: 0 / 28