Submission #660310

#	Time	Username	Problem	Language	Result	Execution time	Memory
660310		600Mihnea	Building Skyscrapers (CEOI19_skyscrapers)	C++17	8 / 100	121 ms	6560 KiB

skyscrapers

bool home = 0;
#include <bits/stdc++.h>

using namespace std;

struct T
{
  int x;
  int y;
};

bool operator < (T a, T b)
{
  if (a.x != b.x)
  {
    return a.x < b.x;
  }
  return a.y < b.y;
}

const int N = 150000 + 7;
int n;
int task;
T points[N];
bool vis[N];
map<T, int> w;

int main()
{
  if (home == 0)
  {
    ios::sync_with_stdio(0); cin.tie(0); cout.tie(0);
  }
  else
  {
    freopen ("input.txt", "r", stdin);
  }

  cin >> n >> task;
  assert(task == 1 || task == 2);

  for (int i = 1; i <= n; i++)
  {
    cin >> points[i].x >> points[i].y;
    w[points[i]] = i;
  }
  vector<int> ord;
  int start = 1;
  queue<int> q;
  q.push(start);
  vis[start] = 1;
  while (!q.empty())
  {
    int a = q.front();
    ord.push_back(a);
    q.pop();
    for (int dx = -1; dx <= +1; dx++)
    {
      for (int dy = -1; dy <= +1; dy++)
      {
        T nw = {points[a].x + dx, points[a].y + dy};
        if (w.count(nw))
        {
          int j = w[nw];
          if (vis[j] == 0)
          {
            vis[j] = 1;
            q.push(j);
          }
        }
      }
    }
  }
  if ((int) ord.size() != n)
  {
    cout << "NO\n";
    return 0;
  }

  cout << "YES\n";
  for (auto &v : ord)
  {
    cout << v << "\n";
  }

  return 0;
}

Compilation message (stderr)

skyscrapers.cpp: In function 'int main()':
skyscrapers.cpp:36:13: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   36 |     freopen ("input.txt", "r", stdin);
      |     ~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 8 / 8
• Subtask 2: 0 / 14
• Subtask 3: 0 / 12
• Subtask 4: 0 / 17
• Subtask 5: 0 / 20
• Subtask 6: 0 / 10
• Subtask 7: 0 / 19