oj.uz

Submission #968898

# Submission time Handle Problem Language Result Execution time Memory
968898 2024-04-24T09:12:39 Z happy_node Furniture (JOI20_furniture) C++17
100 / 100
 1614 ms 72968 KB 
#include <bits/stdc++.h>
using namespace std;

const int MX=1005;

int N,M,Q;
int C[MX][MX], deg[MX][MX], rdeg[MX][MX];

set<pair<int,int>> st[2*MX];

void dfs(int x, int y) {
	if(x+1<=N && !C[x+1][y]) {
		deg[x+1][y]-=1;
		if(deg[x+1][y]==0) {
			st[x+1+y-2].erase({x+1,y});
			C[x+1][y]=1;
			dfs(x+1,y);
		}
	}

	if(y+1<=M && !C[x][y+1]) {
		deg[x][y+1]-=1;
		if(deg[x][y+1]==0) {
			st[x+y+1-2].erase({x,y+1});
			C[x][y+1]=1;
			dfs(x,y+1);
		}
	}
}
	
void rdfs(int x, int y) {
	if(x-1>=1 && !C[x-1][y]) {
		rdeg[x-1][y]-=1;
		if(rdeg[x-1][y]==0) {
			st[x-1+y-2].erase({x-1,y});
			C[x-1][y]=1;
			rdfs(x-1,y);
		}
	}
	if(y-1>=1 && !C[x][y-1]) {
		rdeg[x][y-1]-=1;
		if(rdeg[x][y-1]==0) {
			st[x+y-1-2].erase({x,y-1});
			C[x][y-1]=1;
			rdfs(x,y-1);
		}
	}
}

bool r[MX][MX], rr[MX][MX];

int main() {
	cin.tie(0); ios_base::sync_with_stdio(0);

	cin>>N>>M;

	for(int i=1;i<=N;i++) {
		for(int j=1;j<=M;j++) {
			cin>>C[i][j];
		}
	}

	r[1][1]=1;
	for(int i=1;i<=N;i++) {
		for(int j=1;j<=M;j++) {
			if(C[i][j]) continue;
			if(!r[i][j]) continue;
			r[i+1][j]|=r[i][j];
			r[i][j+1]|=r[i][j];
			deg[i][j+1]+=1;
			deg[i+1][j]+=1;
		}
	}

	rr[N][M]=1;
	for(int i=N;i>=1;i--) {
		for(int j=M;j>=1;j--) {
			if(C[i][j]) continue;
			if(!rr[i][j]) continue;
			rr[i-1][j]|=rr[i][j];
			rr[i][j-1]|=rr[i][j];
			rdeg[i-1][j]+=1;
			rdeg[i][j-1]+=1;
		}
	}

	for(int i=1;i<=N;i++) {
		for(int j=1;j<=M;j++) {
			if(C[i][j]) {
				r[i][j]=0;
				rr[i][j]=0;
			}
		}
	}

	for(int i=1;i<=N;i++) {
		for(int j=1;j<=M;j++) {
			if(r[i][j] && rr[i][j]) {
				st[i+j-2].insert({i,j});
			}
		}
	}

	cin>>Q;

	for(int i=1;i<=Q;i++) {
		int x,y;
		cin>>x>>y;

		if(!st[x+y-2].count({x,y})) {
			cout<<1<<endl;
			continue;
		}

		if(st[x+y-2].size()==1) {
			cout<<0<<endl;
			continue;
		}

		st[x+y-2].erase({x,y});
		C[x][y]=1;
		dfs(x,y);
		rdfs(x,y);

		cout<<1<<endl;
	}

}

Subtask #1
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 8792 KB Output is correct
2 Correct 6 ms 10844 KB Output is correct
3 Correct 8 ms 10844 KB Output is correct
4 Correct 12 ms 11100 KB Output is correct
5 Correct 13 ms 11352 KB Output is correct
6 Correct 16 ms 11228 KB Output is correct
7 Correct 15 ms 11352 KB Output is correct
8 Correct 15 ms 11356 KB Output is correct
9 Correct 15 ms 11376 KB Output is correct

Subtask #2
95.0 / 95.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 8792 KB Output is correct
2 Correct 6 ms 10844 KB Output is correct
3 Correct 8 ms 10844 KB Output is correct
4 Correct 12 ms 11100 KB Output is correct
5 Correct 13 ms 11352 KB Output is correct
6 Correct 16 ms 11228 KB Output is correct
7 Correct 15 ms 11352 KB Output is correct
8 Correct 15 ms 11356 KB Output is correct
9 Correct 15 ms 11376 KB Output is correct
10 Correct 33 ms 9052 KB Output is correct
11 Correct 10 ms 9048 KB Output is correct
12 Correct 815 ms 55020 KB Output is correct
13 Correct 177 ms 41040 KB Output is correct
14 Correct 1456 ms 58368 KB Output is correct
15 Correct 1549 ms 63428 KB Output is correct
16 Correct 1448 ms 67840 KB Output is correct
17 Correct 1483 ms 71204 KB Output is correct
18 Correct 1614 ms 69604 KB Output is correct
19 Correct 1483 ms 72968 KB Output is correct
20 Correct 1509 ms 72944 KB Output is correct
21 Correct 1520 ms 72808 KB Output is correct