Submission #292584

#	Time	Username	Problem	Language	Result	Execution time	Memory
292584		Pajaraja	Furniture (JOI20_furniture)	C++17	100 / 100	3428 ms	5496 KiB

furniture

#include <bits/stdc++.h>
#define MAXN 1007
using namespace std;
bool dpgl[MAXN][MAXN],dpdd[MAXN][MAXN],b[MAXN][MAXN];
int d[2*MAXN];
int n,m;
void theboysgl(int x,int y)
{
	if(x==n+1 || y==m+1 || !dpgl[x][y] || !((x==1 || !dpgl[x-1][y]) && (y==1 || !dpgl[x][y-1]))) return;
	if(dpdd[x][y]) d[x+y]--; 
	dpgl[x][y]=false;
	theboysgl(x+1,y); theboysgl(x,y+1);
}
void theboysdd(int x,int y)
{
	if(x==0 || y==0 || !dpdd[x][y] || !((x==n || !dpdd[x+1][y]) && (y==m || !dpdd[x][y+1]))) return;
	if(dpgl[x][y]) d[x+y]--;
	dpdd[x][y]=false;
	theboysdd(x-1,y); theboysdd(x,y-1);
}
int main()
{
	cin>>n>>m;
	for(int i=1;i<=n;i++) for(int j=1;j<=m;j++) cin>>b[i][j];
	dpgl[1][1]=true; dpdd[n][m]=1;
	for(int i=1;i<=n;i++) for(int j=1;j<=m;j++) if((i!=1 || j!=1) && !b[i][j]) dpgl[i][j]=dpgl[i-1][j] || dpgl[i][j-1];
	for(int i=n;i>=1;i--) for(int j=m;j>=1;j--) if((i!=n || j!=m) && !b[i][j]) dpdd[i][j]=dpdd[i+1][j] || dpdd[i][j+1];
	for(int i=1;i<=n;i++) for(int j=1;j<=m;j++) if(dpgl[i][j] && dpdd[i][j]) d[i+j]++;
	int q; cin>>q;
	while(q--)
	{
		int x,y; cin>>x>>y;
		if(d[x+y]==1 && dpdd[x][y] && dpgl[x][y]) {cout<<"0\n"; continue;}
		cout<<"1\n";
		if(dpdd[x][y] && dpgl[x][y]) d[x+y]--;
		dpdd[x][y]=dpgl[x][y]=false;
		theboysgl(x+1,y); theboysgl(x,y+1);
		theboysdd(x-1,y); theboysdd(x,y-1);
	}
}

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