Submission #1326062

#	Time	Username	Problem	Language	Result	Execution time	Memory
1326062		JuanJL	Furniture (JOI20_furniture)	C++20	0 / 100	5088 ms	516 KiB

furniture

#include <bits/stdc++.h>

#define fst first
#define snd second
#define pb push_back
#define SZ(x) (int)x.size()
#define ALL(x) x.begin(),x.end()
#define forn(i,a,b) for(int i = a; i<b; i++)
#define mset(a,v) memset(a,v,sizeof(a))
#define FIN ios::sync_with_stdio(0); cin.tie(0); cout.tie(0);

using namespace std;
typedef long long ll;

#ifdef D
	#define debug(x) cout << x
#else
	#define debug(x) //nothing
#endif

const int MAXN = 100+5;

vector<pair<ll,ll>> oper = {{0,1},{1,0}};
vector<pair<ll,ll>> roper = {{0,-1},{-1,0}};

ll n,m;
vector<vector<ll>> mapa;
bool vis[MAXN][MAXN];
vector<pair<ll,ll>> llega[MAXN][MAXN];
bool rright[MAXN][MAXN];
bool down[MAXN][MAXN];

bool dfs(ll i, ll j){
	if(vis[i][j]) return (rright[i][j]||down[i][j]);
	vis[i][j]=true;
	if(i==n-1 && j==m-1) rright[i][j]=down[i][j]=true;
	
	for(auto o:oper) if(i+o.fst<n && j+o.snd<m){
		if(mapa[i+o.fst][j+o.snd]==0 && dfs(i+o.fst,j+o.snd)){
			if(o.snd==1) rright[i][j]=true;
			else down[i][j]=true;
		}
	}
	return (rright[i][j]||down[i][j]);
}

bool yes=false;

vector<pair<pair<ll,ll>,ll>> era;

void rdfs(ll i, ll j){
	if(i==0 && j==0){ yes=true; return; }	
	debug("rdfs "<<i<<" "<<j<<'\n');
	
		for(auto o:roper) if(i+o.fst>=0 && j+o.snd>=0){

			if(o.snd==-1 && rright[i+o.fst][j+o.snd]){
				rright[i+o.fst][j+o.snd]=false;
				era.pb({{i+o.fst,j+o.snd},0});
			}
			if(o.fst==-1 && down[i+o.fst][j+o.snd]){
				down[i+o.fst][j+o.snd]=false;
				era.pb({{i+o.fst,j+o.snd},1});
			}

			if(!rright[i+o.fst][j+o.snd] && !down[i+o.fst][j+o.snd]){
				rdfs(i+o.fst,j+o.snd);
			}
		}
	
}

int main(){ FIN;
	cin>>n>>m;
	mapa.clear();
	mapa.resize(n,vector<ll>(m,0));
	forn(i,0,n){
		forn(j,0,m){
			cin>>mapa[i][j];
		}
	}

	dfs(0,0);

	forn(I,0,n){
							forn(J,0,m){
								debug(mapa[I][J]<<" ("); debug(rright[I][J]<<","<<down[I][J]); debug(") ");
							} debug('\n');
						}
			
	ll q; cin>>q;
	forn(i,0,q){
		ll x,y; cin>>x>>y; x--; y--;
		if(mapa[x][y]!=1){
			mapa[x][y]=1;
			/*mset(vis,false);
			forn(I,0,n) forn(J,0,n) llega[I][J].clear();
			if(!dfs(0,0)) mapa[x][y]=0, cout<<0<<'\n';
			else cout<<1<<'\n';*/
			debug('\n');
			debug('\n');
			debug(x<<" "<<y<<'\n');
			yes=false;
			rdfs(x,y);
			debug(yes<<'\n');
			if(yes){
				mapa[x][y]=0;
				forn(j,0,SZ(era)){
					if(era[j].snd) down[era[j].fst.fst][era[j].fst.snd]=true;
					else rright[era[j].fst.fst][era[j].fst.snd]=true;
				}
				era.clear();
				cout<<0<<'\n';
			}else{
				era.clear();
				rright[x][y]=false;
				down[x][y]=false;
				cout<<1<<'\n';
			}

			
					forn(I,0,n){
											forn(J,0,m){
												debug(mapa[I][J]<<" ("); debug(rright[I][J]<<","<<down[I][J]); debug(") ");
											} debug('\n');
										}
							
		}else{
			cout<<0<<'\n';
		}
	}
	
	return 0;
}

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