Submission #886334

#	Time	Username	Problem	Language	Result	Execution time	Memory
886334		stefanneagu	Furniture (JOI20_furniture)	C++17	5 / 100	1231 ms	18768 KiB

furniture

#include <bits/stdc++.h>
#define int long long
using namespace std;
const int nmax = 1e3 + 5;
int jd[nmax][nmax], ss[nmax][nmax], diag[nmax], n, m;
bool f[nmax][nmax];
bool in(int a, int b) {
  if(a > n || b > m || min(a, b) < 0) {
    return 0;
  }
  return 1;
}
void dfs(int i, int j) {
  if(!in(i, j) || f[i][j] == 1) {
    return;
  }
  f[i][j] = 1;
  diag[i + j] --;
  ss[i - 1][j] --;
  ss[i][j - 1] --;
  jd[i + 1][j] --;
  jd[i][j + 1] --;
  if(ss[i - 1][j] == 0) {
    dfs(i - 1, j);
  }
  if(ss[i][j - 1] == 0) {
    dfs(i, j - 1);
  }
  if(jd[i + 1][j] == 0) {
    dfs(i + 1, j);
  }
  if(jd[i][j + 1] == 0) {
    dfs(i, j + 1);
  }
}
int32_t main() {
  cin >> n >> m;
  for(int i = 0; i <= n + 1; i ++) {
    f[i][0] = 1;
    f[i][m + 1] = 1;
  }
  for(int j = 0; j <= m + 1; j ++) {
    f[0][j] = 1;
    f[n + 1][j] = 1;
  }
  for(int i = 1; i <= n; i ++) {
    for(int j = 1; j <= m; j ++) {
      diag[i + j] ++;
      jd[i + 1][j] += 1;
      jd[i][j + 1] += 1;
      ss[i - 1][j] += 1;
      ss[i][j - 1] += 1;
    }
  }
  for(int i = 1; i <= n; i ++) {
    for(int j = 1; j <= m; j ++) {
      int a;
      cin >> a;
      if(a == 1) {
        dfs(i, j);
        //cout << i << " " << j << endl;
      }
    }
  }
  int q;
  cin >> q;
  for(int i = 1; i <= q; i ++) {
    int a, b;
    cin >> a >> b;
    if(f[a][b] == 1 || diag[a + b] != 1) {
      cout << "1\n";
      dfs(a, b);
    } else {
      cout << "0\n";
    }
  }
  return 0;
}

• Subtask 1: 5 / 5
• Subtask 2: 0 / 95