oj.uz

Submission #681553

# Submission time Handle Problem Language Result Execution time Memory
681553 2023-01-13T10:18:31 Z peijar Furniture (JOI20_furniture) C++17
100 / 100
 301 ms 27756 KB 
#include <bits/stdc++.h>
#define int long long
using namespace std;

namespace std {
template <typename T> ostream &operator<<(ostream &out, const vector<T> &vec) {
  out << "[";
  for (int i = 0; i < (int)vec.size(); ++i) {
    out << vec[i];
    if (i + 1 < (int)vec.size())
      out << ", ";
  }
  return out << "]";
}
} // namespace std

void dbg_out() { cout << endl; }
template <typename Head, typename... Tail> void dbg_out(Head H, Tail... T) {
  cout << ' ' << H;
  dbg_out(T...);
}

#ifdef DEBUG
#define dbg(...) cout << "(" << #__VA_ARGS__ << "):", dbg_out(__VA_ARGS__)
#else
#define dbg(...)
#endif

signed main(void) {
  ios_base::sync_with_stdio(false);
  cin.tie(0);

  int nbLig, nbCol;
  cin >> nbLig >> nbCol;

  vector<int> onDiag(nbLig + nbCol - 1);

  vector<vector<bool>> isUseful(nbLig, vector<bool>(nbCol, true));
  vector<vector<int>> cntReach(nbLig, vector<int>(nbCol));
  vector<vector<int>> cntReachRev(nbLig, vector<int>(nbCol));
  for (int lig = 0; lig < nbLig; ++lig)
    for (int col = 0; col < nbCol; ++col) {
      if (lig + 1 < nbLig)
        cntReach[lig + 1][col]++, cntReachRev[lig][col]++;
      if (col + 1 < nbCol)
        cntReach[lig][col + 1]++, cntReachRev[lig][col]++;
      onDiag[lig + col] += 1;
    }

  auto tryDisable = [&](int lig, int col) {
    if (!isUseful[lig][col])
      return true;
    if (onDiag[lig + col] == 1)
      return false;

    queue<pair<int, int>> q;
    q.emplace(lig, col);
    while (!q.empty()) {
      auto [r, c] = q.front();
      q.pop();
      assert(isUseful[r][c]);
      isUseful[r][c] = false;
      onDiag[r + c]--;

      // try right
      if (c + 1 < nbCol) {
        cntReach[r][c + 1]--;
        if (!cntReach[r][c + 1] and isUseful[r][c + 1])
          q.emplace(r, c + 1);
      }
      // try bot
      if (r + 1 < nbLig) {
        cntReach[r + 1][c]--;
        if (!cntReach[r + 1][c] and isUseful[r + 1][c])
          q.emplace(r + 1, c);
      }
      // try left
      if (c > 0) {
        cntReachRev[r][c - 1]--;
        if (!cntReachRev[r][c - 1] and isUseful[r][c - 1])
          q.emplace(r, c - 1);
      }
      // try top
      if (r > 0) {
        cntReachRev[r - 1][c]--;
        if (!cntReachRev[r - 1][c] and isUseful[r - 1][c])
          q.emplace(r - 1, c);
      }
    }
    return true;
  };

  for (int lig = 0; lig < nbLig; ++lig)
    for (int col = 0; col < nbCol; ++col) {
      int x;
      cin >> x;
      if (x)
        assert(tryDisable(lig, col));
    }

  int q;
  cin >> q;
  for (int i = 0; i < q; ++i) {
    for (int lig = 0; lig < nbLig; ++lig)
      dbg(isUseful[lig]);
    dbg(onDiag);
    int lig, col;
    cin >> lig >> col;
    --lig, --col;
    cout << tryDisable(lig, col) << '\n';
  }
}

Subtask #1
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 340 KB Output is correct
2 Correct 1 ms 340 KB Output is correct
3 Correct 2 ms 468 KB Output is correct
4 Correct 3 ms 468 KB Output is correct
5 Correct 4 ms 468 KB Output is correct
6 Correct 3 ms 468 KB Output is correct
7 Correct 3 ms 468 KB Output is correct
8 Correct 5 ms 512 KB Output is correct
9 Correct 3 ms 468 KB Output is correct

Subtask #2
95.0 / 95.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 340 KB Output is correct
2 Correct 1 ms 340 KB Output is correct
3 Correct 2 ms 468 KB Output is correct
4 Correct 3 ms 468 KB Output is correct
5 Correct 4 ms 468 KB Output is correct
6 Correct 3 ms 468 KB Output is correct
7 Correct 3 ms 468 KB Output is correct
8 Correct 5 ms 512 KB Output is correct
9 Correct 3 ms 468 KB Output is correct
10 Correct 11 ms 1236 KB Output is correct
11 Correct 3 ms 588 KB Output is correct
12 Correct 182 ms 16020 KB Output is correct
13 Correct 79 ms 16012 KB Output is correct
14 Correct 279 ms 23848 KB Output is correct
15 Correct 274 ms 23492 KB Output is correct
16 Correct 269 ms 25520 KB Output is correct
17 Correct 279 ms 26892 KB Output is correct
18 Correct 291 ms 26208 KB Output is correct
19 Correct 291 ms 27756 KB Output is correct
20 Correct 290 ms 27692 KB Output is correct
21 Correct 301 ms 27728 KB Output is correct