Submission #1343189

#TimeUsernameProblemLanguageResultExecution timeMemory
1343189tolbiFurniture (JOI20_furniture)C++20
100 / 100
170 ms18204 KiB
#include <bits/stdc++.h>
using namespace std;
#define int long long
int32_t main(){
  ios_base::sync_with_stdio(false);
  cin.tie(0);
  int n, m;
  cin >> n >> m;
  vector<vector<bool>> v(n, vector<bool>(m));
  for (int i = 0; i < n; ++i)
  {
    for (int j = 0; j < m; ++j) {
      int x;cin>>x;
      v[i][j] = x;
    }
  }
  for (int i = 0; i < n; ++i) {
    for (int j = 0; j < m; ++j) {
      if (i == 0 && j == 0) continue;
      if ((i==0 || v[i-1][j]==1) && (j==0 || v[i][j-1] == 1)) {
        v[i][j] = 1;
      }
    }
  }
  array<int,2> qu[1000000];
  int q;cin>>q;
  while (q--) {
    int x, y;cin>>x>>y;
    x--, y--;
    if (v[x][y] == 1) {
      cout << 1 << '\n';
      continue;
    }
    int l = y, r = y;
    if (x > 0) {
      while (r + 1 < m && v[x-1][r+1] == 1) r++;
    } else r = m - 1;
    for (int i = x + 1; i < n; i++) {
      while (l <= r && ((l > 0 && v[i][l-1] == 0) || v[i][l] == 1)) l++;
      if (l > r) {
        break;
      }
      while (r + 1 < m && v[i-1][r+1] == 1) r++;
    }
    if (l > r || r < m - 1) {
      cout << 1 << '\n';
      int sz = 1;
      qu[0] = {x, y};
      while (sz > 0) {
        sz--;
        int i = qu[sz][0], j = qu[sz][1];
        if (v[i][j] == 0) {
          v[i][j] = 1;
          if (i + 1 < n && (j == 0 || v[i+1][j-1] == 1)) qu[sz++] = {i+1, j};
          if (j + 1 < m && (i == 0 || v[i-1][j+1] == 1)) qu[sz++] = {i, j+1};
        }
      }
    } else cout << 0 << '\n';
  }
}
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