Submission #1029555

#	Time	Username	Problem	Language	Result	Execution time	Memory
1029555		kunzaZa183	Teleporters (IOI08_teleporters)	C++17	0 / 100	1090 ms	65536 KiB

teleporters

#include <bits/stdc++.h>
using namespace std;
int main() {
  cin.tie(0)->sync_with_stdio(0);
  cin.exceptions(cin.failbit);
  int n, m;
  cin >> n >> m;
  map<int, int> mii;
  vector<int> tp(2e6 + 1);
  for (int i = 0; i < n; i++) {
    int a, b;
    cin >> a >> b;
    mii[a] = b, mii[b] = a;
    tp[a] = b, tp[b] = a;
  }
  vector<pair<int, int>> vpii;
  vpii.emplace_back(0, mii.begin()->first);
  for (auto it = mii.begin(); it != mii.end(); it++) {
    auto it2 = it;
    it2++;
    int a = it->first, b;
    if (it2 == mii.end())
      b = 3e6;
    else
      b = it2->first;
    vpii.emplace_back(a, b);
  }
  vector<bool> vb;
  vb.resize(vpii.size());
  vector<int> cyc;
  int special;
  for (int i = 0; i < vb.size(); i++)
    if (!vb[i]) {
      // cout << "I = " << i << '\n';
      int cy = 0;
      function<void(int)> dfs;
      dfs = [&](int cur) {
        // cout << cur << "\n";
        if (vb[cur]) {
          cyc.push_back(cy);
          return;
        }
        vb[cur] = 1;
        cy++;
        if (vpii[cur].second == 3e6) {
          special = cy - 1;
          return;
        }
        dfs(lower_bound(vpii.begin(), vpii.end(),
                        make_pair(tp[vpii[cur].second], -1)) -
            vpii.begin());
      };
      dfs(i);
    }
  // for (auto a : cyc) cout << a << ' ';
  // cout << "\n";
  if (m == 0) {
    cout << special << "\n";
  } else
    while (1) {
    }
  sort(cyc.begin(), cyc.end(), greater<int>());
  if (m >= cyc.size())
    cout << special + accumulate(cyc.begin(), cyc.end(), 0) + m * 2 << "\n";
  else
    cout << special + accumulate(cyc.begin(), cyc.begin() + m, 0) + 2 * m
         << "\n";
}

Compilation message (stderr)

teleporters.cpp: In function 'int main()':
teleporters.cpp:32:21: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<bool>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   32 |   for (int i = 0; i < vb.size(); i++)
      |                   ~~^~~~~~~~~~~
teleporters.cpp:63:9: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   63 |   if (m >= cyc.size())
      |       ~~^~~~~~~~~~~~~

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