Submission #292579

#	Time	Username	Problem	Language	Result	Execution time	Memory
292579		model_code	Furniture (JOI20_furniture)	C++17	100 / 100	3450 ms	6700 KiB

furniture

#include <iostream>
#include <stack>
#include <utility>
#include <vector>

int main() {
  int N, M;
  std::cin >> N >> M;

  std::vector<std::vector<int>> R(N + 2, std::vector<int>(M + 2, 1));
  std::vector<int> L(N + M + 1, 0);
  for (int i = 1; i <= N; ++i) {
    for (int j = 1; j <= M; ++j) {
      R[i][j] = 0;
      ++L[i + j];
    }
  }

  const auto set = [&](const int X, const int Y) -> int {
    if (R[X][Y] == 1) {
      return 1;
    }
    if (L[X + Y] == 1) {
      return 0;
    }
    std::stack<std::pair<int, int>> st;
    const auto push = [&](const int x, const int y) {
      if (R[x][y] == 0) {
        R[x][y] = 1;
        --L[x + y];
        st.emplace(x, y);
      }
    };
    push(X, Y);
    while (!st.empty()) {
      const int x = st.top().first;
      const int y = st.top().second;
      st.pop();
      if (R[x - 1][y + 1] == 1) {
        push(x - 1, y);
        push(x, y + 1);
      }
      if (R[x + 1][y - 1] == 1) {
        push(x, y - 1);
        push(x + 1, y);
      }
    }
    return 1;
  };

  for (int i = 1; i <= N; ++i) {
    for (int j = 1; j <= M; ++j) {
      int C;
      std::cin >> C;
      if (C == 1) {
        set(i, j);
      }
    }
  }

  int Q;
  std::cin >> Q;
  for (int k = 1; k <= Q; ++k) {
    int X, Y;
    std::cin >> X >> Y;
    std::cout << set(X, Y) << "\n";
  }

  return 0;
}

• Subtask 1: 5 / 5
• Subtask 2: 95 / 95