Submission #374185

#	Time	Username	Problem	Language	Result	Execution time	Memory
374185		ivan_tudor	Furniture (JOI20_furniture)	C++14	0 / 100	2 ms	896 KiB

furniture

#include<bits/stdc++.h>
using namespace std;
const int N = 1005;
bool good[N][N];
int mat[N][N];
int lft[2*N];
int dx[] = {-1, 0, 1, 0};
int dy[] = {0, 1, 0, -1};
bool check(int i, int j){
  for(int k = 0; k < 4; k++){
    int ni1 = i + dx[k], ni2 = i + dx[(k + 1)%4];
    int nj1 = j + dy[k], nj2 = j + dy[(k + 1)%4];
    if(good[ni1][nj1] && good[ni2][nj2])
      return true;
  }
  return false;
}
bool update(int i,int j){
  if(lft[i + j] == 1)
    return false;
  good[i][j] = true;
  lft[i + j]--;
  for(int k = 0; k <4;k++){
    int ni = i + dx[k];
    int nj = j + dy[k];
    if(good[ni][nj] == false && check(ni, nj)){
      update(ni, nj);
    }
  }
  return true;
}
int main()
{
  //freopen(".in","r",stdin);
  ios::sync_with_stdio(false);
  cin.tie(0),cout.tie(0);
  int n, m;
  cin>>n>>m;
  for(int i = 1; i<=n;i++){
    for(int j =1 ; j<=m;j++){
      lft[i + j]++;
      cin>>mat[i][j];
    }
  }
  for(int i = 1; i<=n;i++)
    good[i][0] =  good[i][m + 1] = true;
  for(int i =1 ; i<=m;i++)
    good[0][i] = good[n + 1][i] = true;
  for(int i = 1; i<=n;i++){
    for(int j =1 ; j<=m;j++){
      if(mat[i][j])
        update(i, j);
    }
  }
  int q;
  cin>>q;
  for(int i=1;i<=q;i++){
    int x, y;
    cin>>x>>y;
    if(good[x][y] == true){
      cout<<"1\n";
      continue;
    }
    bool ans = update(x, y);
    cout<<ans<<"\n";
  }
  return 0;
}

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