Submission #864400

#	Time	Username	Problem	Language	Result	Execution time	Memory
864400		epicci23	Furniture (JOI20_furniture)	C++17	100 / 100	241 ms	20052 KiB

furniture

#include "bits/stdc++.h"
using namespace std;
#define pb push_back
#define endl "\n" 
#define int long long
#define sz(x) ((int)(x).size())
#define all(x) (x).begin(),(x).end()


int n,m;
vector<vector<int>> v;
vector<int> freq;
bool valid(int i,int j){
  return min(i,j)>=1 && i<=n && j<=m;
}

void upd(int i,int j){

  if(!valid(i,j)) return;
  if(v[i][j]==0) return;
  
  freq[i+j]++;

  if(valid(i+1,j) && v[i+1][j]==0){
    if(!valid(i+1,j-1) || v[i+1][j-1]==1){
       v[i+1][j]=1;
       upd(i+1,j);
    }
  }

  if(valid(i,j+1) && v[i][j+1]==0){
    if(!valid(i-1,j+1) || v[i-1][j+1]==1){
       v[i][j+1]=1;
       upd(i,j+1);
    }
  }

  if(valid(i-1,j) && v[i-1][j]==0){
    if(!valid(i-1,j+1) || v[i-1][j+1]==1){
       v[i-1][j]=1;
       upd(i-1,j);
    }
  }

  if(valid(i,j-1) && v[i][j-1]==0){
    if(!valid(i+1,j-1) || v[i+1][j-1]==1){
       v[i][j-1]=1;
       upd(i,j-1);
    }
  }

}

void solve(){

	cin >> n >> m;
	v.assign(n+5,vector<int>(m+5,0));
	freq.assign(n+m+5,0);

	for(int i=1;i<=n;i++){
		for(int j=1;j<=m;j++){
          int u;
          cin >> u;
          if(u==1 && v[i][j]==0){
          	v[i][j]=1;
          	upd(i,j);
          }
		}
	}

	int q;
	cin >> q;
	while(q--){
	  int a,b;
	  cin >> a >> b;
	  if(v[a][b]==1){
	  	cout << 1 << endl;
	  	continue;
	  }
	  int u = a + b;
      if(freq[u]==min(a-1,m-b)+min(n-a,b-1)){
      	cout << 0 << endl;
      	continue;
      }
      cout << 1 << endl;
      v[a][b]=1;
      upd(a,b);
	}
}

int32_t main(){

  cin.tie(0); ios::sync_with_stdio(0);
  
  int t=1;//cin >> t;
  while(t--) solve();

  return 0;
}

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