Submission #200056

#	Time	Username	Problem	Language	Result	Execution time	Memory
200056		EntityIT	Meetings (JOI19_meetings)	C++14	100 / 100	1360 ms	1144 KiB

meetings

#include<bits/stdc++.h>
#include "meetings.h"

using namespace std;

#define all(x) (x).begin(), (x).end()
#define sz(x) ( (int)(x).size() )
using LL = long long;

mt19937 rng( (uint32_t)chrono::steady_clock::now().time_since_epoch().count() );

void bridge(int u, int v) { Bridge(min(u, v), max(u, v) ); }

vector<vector<int> > rem;
void solve(int l) {
  if (!sz(rem[l]) ) return ;

  int r = rem[l].back(); rem[l].pop_back();

  vector<int> tmp = rem[l];
  rem[l].clear(); rem[r].clear();
  for (int u : tmp) rem[u].clear();

  vector<int> path;
  for (auto u : tmp) {
    int pr = Query(l, r, u);
    if (pr == u) {
      if (u != l && u != r) path.emplace_back(u);
    }
    else rem[pr].emplace_back(u);
  }

  if (sz(path) ) {
    sort(all(path), [&](int u, int v) { return Query(l, u, v) == u; });
    bridge(l, path[0]);
    bridge(r, path.back() );
    for (int i = 0; i + 1 < sz(path); ++i) bridge(path[i], path[i + 1]);
  }
  else bridge(l, r);

  solve(l); solve(r);
  for (auto &u : path) solve(u);
}

void Solve(int N) {
  rem.assign(N, {} );
  for (int u = 1; u < N; ++u) rem[0].emplace_back(u);
  solve(0);
}

• Subtask 1: 7 / 7
• Subtask 2: 10 / 10
• Subtask 3: 12 / 12
• Subtask 4: 71 / 71