Submission #1084068

#	Time	Username	Problem	Language	Result	Execution time	Memory
1084068		May27_th	Exhibition (JOI19_ho_t2)	C++17	0 / 100	1 ms	348 KiB

joi2019_ho_t2

#include<bits/stdc++.h>
 
using namespace std;
 
#define i64 long long
#define mp make_pair
#define pb push_back
#define all(x) (x).begin(), (x).end()

void Maximize(pair<int, int> &a, pair<int, int> b) {
  if (a.first < b.first) a = b;
  else if (a.first == b.first) a.second = min(a.second, b.second);
}

void Solve(void) {
  int N, M; cin >> N >> M;
  vector<pair<int, int>> pics(N), f(N + 2, mp(-1, -1));
  for (int i = 0; i < N; i ++) {
    cin >> pics[i].second >> pics[i].first;
  } 
  vector<int> frames;
  for (int i = 0; i < M; i ++) {
    int x; cin >> x;
    frames.pb(x);
  } sort(all(frames));
  sort(all(pics));
  stack<int> s; 
  int ans = 0;
  for (int i = 0; i < N; i ++) {
    // cout << pics[i].first << " " << pics[i].second << "\n";
    while (!s.empty() && pics[s.top()].second > pics[i].second) {
      if (f[s.top()].second < M - 1 && f[s.top()].first != -1) {
        Maximize(f[i], mp(f[s.top()].first + 1, f[s.top()].second + 1));
      }
      s.pop();
    }
    int p = lower_bound(all(frames), pics[i].second) - frames.begin();
    if (p != M) {
      Maximize(f[i], mp(1, p));
      if (!s.empty()) {
        int curp = max(f[s.top()].second + 1, p);
        if (curp < M && f[s.top()].first != -1) {
          Maximize(f[i], mp(f[s.top()].first + 1, curp));
        }
      }
    }
    s.push(i);
    ans = max(ans, f[i].first);
    // cout << pics[i].second << " " << f[i].first << " " << f[i].second << "\n";
  }
  cout << ans << "\n";
}

signed main() {
  ios_base::sync_with_stdio(false); cin.tie(0);
  int Tests = 1; // cin >> Tests; 
  while (Tests --) {
    Solve();    
  }
}

• Subtask 1: 0 / 10
• Subtask 2: 0 / 40
• Subtask 3: 0 / 50