oj.uz

Submission #668254

# Submission time Handle Problem Language Result Execution time Memory
668254 2022-12-03T12:22:13 Z 600Mihnea Collecting Mushrooms (NOI18_collectmushrooms) C++17
0 / 100
 16 ms 5316 KB 
#include <bits/stdc++.h>


using namespace std;

int main()
{
#ifdef ONPC
  freopen ("input.txt", "r", stdin);
#endif // ONPC

#ifndef ONPC
  ios::sync_with_stdio(0); cin.tie(0); cout.tie(0);
#endif // ONPC

  int n, m, r, need;
  cin >> n >> m >> r >> need;
  vector<pair<int, int>> mus, spr;
  for (int i = 0; i < n; i++)
  {
    string s;
    cin >> s;
    assert((int) s.size() == m);
    for (int j = 0; j < m; j++)
    {
      char ch = s[j];
      if (ch == '.')
      {
        continue;
      }
      if (ch == 'S')
      {
        spr.push_back({i, j});
        continue;
      }
      if (ch == 'M')
      {
        mus.push_back({i, j});
        continue;
      }
      assert(0);
    }
  }
  int sol = 0;
  sort(mus.begin(), mus.end());
  sort(spr.begin(), spr.end());
  int p1 = 0, p2 = 0;

  int dim = m + 7;
  vector<int> t(dim, 0);

  auto add = [&] (int pos, int x)
  {
    pos++;
    for (int i = pos; i < dim; i += i & (-i))
    {
      t[i] += x;
    }
  };

  auto get = [&] (int pos)
  {
    pos++;
    int sol = 0;
    for (int i = pos; i >= 1; i -= i & (-i))
    {
      if (i < dim)
      sol += t[i];
    }
    return sol;
  };

  for (auto &it : mus)
  {
    while (p1 < (int) spr.size() && spr[p1].first <= it.first + r)
    {
     /// add(spr[p1].second, +1);
      p1++;
    }
    while (p2 < (int) spr.size() && spr[p2].first < it.first - r)
    {
      //add(spr[p2].second, -1);
      p2++;
    }
    int cnt = 0;
    for (int j = p2; j < p1; j++)
    {
      int d = abs(spr[j].second - it.second);
      if (d <= r)
      {
        cnt++;
      }
    }
  ///  assert(cnt == get(it.second + r) - get(it.second - r - 1));
    sol += (get(it.second + r) - get(it.second - r - 1) >= need);
  }
  cout << sol << "\n";
}

Compilation message

mushrooms.cpp: In function 'int main()':
mushrooms.cpp:52:8: warning: variable 'add' set but not used [-Wunused-but-set-variable]
   52 |   auto add = [&] (int pos, int x)
      |        ^~~

Subtask #1
0 / 9.0

# Verdict Execution time Memory Grader output
1 Incorrect 1 ms 212 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #2
0 / 10.0

# Verdict Execution time Memory Grader output
1 Incorrect 1 ms 212 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #3
0 / 18.0

# Verdict Execution time Memory Grader output
1 Incorrect 1 ms 264 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #4
0 / 23.0

# Verdict Execution time Memory Grader output
1 Incorrect 1 ms 340 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #5
0 / 19.0

# Verdict Execution time Memory Grader output
1 Incorrect 16 ms 5316 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #6
0 / 21.0

# Verdict Execution time Memory Grader output
1 Incorrect 1 ms 212 KB Output isn't correct
2 Halted 0 ms 0 KB -