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Submission #968906

# Submission time Handle Problem Language Result Execution time Memory
968906 2024-04-24T09:19:49 Z happy_node Furniture (JOI20_furniture) C++17
100 / 100
 1307 ms 22668 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], cnt[2*MX];
bool good[MX][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) {
			if(good[x+1][y])
				cnt[x+1+y-2]-=1;
			good[x+1][y]=0;
			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) {
			if(good[x][y+1])
				cnt[x+y+1-2]-=1;
			good[x][y+1]=0;
			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) {
			if(good[x-1][y])
				cnt[x-1+y-2]-=1;
			good[x-1][y]=0;
			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) {
			if(good[x][y-1])
				cnt[x+y-1-2]-=1;
			good[x][y-1]=0;
			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]) {
				good[i][j]=1;
				cnt[i+j-2]+=1;
			}
		}
	}

	cin>>Q;

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

		if(!good[x][y]) {
			cout<<1<<endl;
			continue;
		}

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

		good[x][y]=0;
		cnt[x+y-2]-=1;
		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 2 ms 8536 KB Output is correct
2 Correct 6 ms 8796 KB Output is correct
3 Correct 6 ms 8796 KB Output is correct
4 Correct 13 ms 8840 KB Output is correct
5 Correct 15 ms 8840 KB Output is correct
6 Correct 14 ms 8796 KB Output is correct
7 Correct 15 ms 8796 KB Output is correct
8 Correct 17 ms 8796 KB Output is correct
9 Correct 14 ms 8796 KB Output is correct

Subtask #2
95.0 / 95.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 8536 KB Output is correct
2 Correct 6 ms 8796 KB Output is correct
3 Correct 6 ms 8796 KB Output is correct
4 Correct 13 ms 8840 KB Output is correct
5 Correct 15 ms 8840 KB Output is correct
6 Correct 14 ms 8796 KB Output is correct
7 Correct 15 ms 8796 KB Output is correct
8 Correct 17 ms 8796 KB Output is correct
9 Correct 14 ms 8796 KB Output is correct
10 Correct 32 ms 8796 KB Output is correct
11 Correct 10 ms 8540 KB Output is correct
12 Correct 418 ms 18464 KB Output is correct
13 Correct 57 ms 16200 KB Output is correct
14 Correct 1020 ms 20936 KB Output is correct
15 Correct 1081 ms 21092 KB Output is correct
16 Correct 1155 ms 21532 KB Output is correct
17 Correct 1215 ms 22352 KB Output is correct
18 Correct 1216 ms 22076 KB Output is correct
19 Correct 1255 ms 22308 KB Output is correct
20 Correct 1253 ms 22576 KB Output is correct
21 Correct 1307 ms 22668 KB Output is correct