Submission #791173

#TimeUsernameProblemLanguageResultExecution timeMemory
791173FaeeFurniture (JOI20_furniture)C++14
100 / 100
231 ms25436 KiB
#include<bits/stdc++.h>
using namespace std;
#define ll long long
#define fi first
#define se second
#define endl "\n"
#define pii pair<ll,ll>
#define pb push_back
#define vi vector<ll>
#define pque priority_queue
#define pqueg priority_queue<ll,vector<ll>,greater<ll>>
#define que queue<ll>
#define FOR(m,i,n) for(int i=(m); i<=(n); i++)
#define FORM(m,i,n) for(int i=(m); i>=(n); i--)
#define all(v) sort(v.begin(),v.end())
ll n,m,qq,x,y;
queue<pii> q;
ll grid[1010][1010],d[1000100];
bool vis[1010][1010];
vector<pii> v,vd;
bool cek;
void bfs() {
	cek = false;
	while(!q.empty()) {
		pii x = q.front();
		q.pop();
		d[x.fi+x.se]--;
		vd.pb({x.fi,x.se});
		if(d[x.fi+x.se] == 0) {
			cek = true;
			return;
		}
		if(vis[x.fi+1][x.se-1]) {
			if(!vis[x.fi+1][x.se]) {
				q.push({x.fi+1,x.se});
				vis[x.fi+1][x.se] = true;
				v.pb({x.fi+1,x.se});
			}
			if(!vis[x.fi][x.se-1]) {
				q.push({x.fi,x.se-1});			
				vis[x.fi][x.se-1] = true;			
				v.pb({x.fi,x.se-1});
			}
		}
		if(vis[x.fi-1][x.se+1]) {
			if(!vis[x.fi][x.se+1]) {
				q.push({x.fi,x.se+1});
				vis[x.fi][x.se+1] = true;
				v.pb({x.fi,x.se+1});
			}
			if(!vis[x.fi-1][x.se]) {
				q.push({x.fi-1,x.se});
				vis[x.fi-1][x.se] = true;				
				v.pb({x.fi-1,x.se});
			}
		} 
	}
}
int main() {
	ios_base::sync_with_stdio(0);
	cin.tie(0);
	cin >> n >> m;
	FOR(1,i,n) {
		FOR(1,j,m) {
			cin >> grid[i][j];
			vis[i][j] = grid[i][j];
			if(vis[i][j]) q.push({i,j});
			d[i+j]++;
		} 
	}
	FOR(1,i,m) vis[0][i] = true;
	FOR(1,i,n) vis[i][0] = true;
	FOR(1,i,m) vis[n+1][i] = true;
	FOR(1,i,n) vis[i][m+1] = true;
	bfs();
	v.clear();
	vd.clear();
	cin >> qq;
	while(qq--) {
		cin >> x >> y;
		if(vis[x][y]) {
			cout << 1 << endl;
			continue;
		}
		vis[x][y] = true;
		q.push({x,y});
		v.pb({x,y});
		bfs();
		if(cek) {
			cout << 0 << endl;
			for(auto i : vd) d[i.fi+i.se]++;
			for(auto i : v) vis[i.fi][i.se] = false;
		}
		else {
			cout << 1 << endl;
		}
		v.clear();
		vd.clear();
	}
}
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