제출 #262168

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
262168		WLZ	Teleporters (IOI08_teleporters)	C++14	75 / 100	1099 ms	65536 KiB

teleporters

#include <bits/stdc++.h>
using namespace std;

int n, m;
vector< vector<int> > g;
vector<bool> was;
int sz = 0;
map<int, int> other;
vector<int> a;

void dfs(int u) {
  was[u] = true;
  if (u == 2 * n) {
    return;
  }
  sz++;
  int next = upper_bound(a.begin(), a.end(), other[a[u]]) - a.begin();
  if (!was[next]) {
    dfs(next);
  }
}

int main() {
  ios::sync_with_stdio(false);
  cin.tie(0);
  cin >> n >> m;
  for (int i = 0; i < n; i++) {
    int w, e;
    cin >> w >> e;
    other[w] = e;
    other[e] = w;
    a.push_back(e);
    a.push_back(w);
  }
  sort(a.begin(), a.end());
  was.assign(2 * n + 1, false);
  dfs(0);
  int ans = sz;
  vector<int> b;
  for (int i = 0; i < 2 * n; i++) {
    if (!was[i]) {
      sz = 0;
      dfs(i);
      b.push_back(sz);
    }
  }
  sort(b.rbegin(), b.rend());
  for (int i = 0; i < min(m, (int) b.size()); i++) {
    ans += b[i] + 2;
  }
  m -= min(m, (int) b.size());
  while (m > 0) {
    ans++;
    m--;
    if (m > 0) {
      ans += 3;
      m--;
    }
  }
  cout << ans << '\n';
  return 0;
}

• Subtask 1: 5 / 5
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• Subtask 16: 0 / 5
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