oj.uz

Submission #391162

# Submission time Handle Problem Language Result Execution time Memory
391162 2021-04-18T06:26:19 Z keta_tsimakuridze Furniture (JOI20_furniture) C++14
100 / 100
 2301 ms 36732 KB 
#include<bits/stdc++.h>
#define f first
#define int long long
#define s second
using namespace std;
const int N=1005,mod=1e9+7;
int t,d2[N][N],d1[N][N],p[N][N],n,m,cnt[2*N];
queue<pair<int,int> > q;
char c[N][N];
bool ok(int x,int y){
	if(min(x,y)<1 || x>n || y>m) return 0;
	return 1;
}
void dfs1(int x,int y){
	if(d1[x][y] || c[x][y]=='1') return;
	d1[x][y]=1;
	if(ok(x+1,y)) dfs1(x+1,y);
	if(ok(x,y+1)) dfs1(x,y+1);
}
void dfs2(int x,int y){
	if(d2[x][y] || c[x][y]=='1') return;
	d2[x][y]=1; 
	if(ok(x-1,y)) dfs2(x-1,y);
	if(ok(x,y-1)) dfs2(x,y-1);
}
void update1(int x,int y){
	if(ok(x+1,y) && p[x+1][y] && !p[x+1][y-1]) q.push({x+1,y});	
	if(ok(x,y+1) && p[x][y+1] && !p[x-1][y+1]) q.push({x,y+1});	
	while(q.size()){
		x=q.front().f;
		y=q.front().s;
		q.pop();
		if(p[x][y-1] || p[x-1][y]) continue;
		p[x][y]=0; cnt[x+y]--;
		if(ok(x+1,y) && p[x+1][y] && !p[x+1][y-1]) q.push({x+1,y});	
		if(ok(x,y+1) && p[x][y+1] && !p[x-1][y+1]) q.push({x,y+1});	
	}
}
void update2(int x,int y){
	if(ok(x-1,y) && p[x-1][y] && !p[x-1][y+1]) q.push({x-1,y});	
	if(ok(x,y-1) && p[x][y-1] && !p[x+1][y-1]) q.push({x,y-1});	
	while(q.size()){
		x=q.front().f;
		y=q.front().s;
		q.pop(); 
		if(p[x][y+1] || p[x+1][y]) continue;
		p[x][y]=0; cnt[x+y]--;
		if(ok(x-1,y) && p[x-1][y] && !p[x-1][y+1]) q.push({x-1,y});	
		if(ok(x,y-1) && p[x][y-1] && !p[x+1][y-1]) q.push({x,y-1});	
	}
}
 main(){
	// t=1;
	cin>>n>>m;
	for(int i=1;i<=n;i++){
		for(int j=1;j<=m;j++){
			cin>>c[i][j];
		}
	}
	dfs1(1,1);
	dfs2(n,m); d1[1][1]=d2[n][m]=1;
	for(int i=1;i<=n;i++){
		for(int j=1;j<=m;j++){
			if(d1[i][j] && d2[i][j]) p[i][j]=1,cnt[i+j]++;
		
		}
	}
	int q;
	cin>>q;
	while(q--){
		int a,b;
		cin>>a>>b;
		if(!p[a][b] ) {
			cout<<1<<endl;
		}
		else {
			if(cnt[a+b]-1){ 
				p[a][b]=0; 
				cnt[a+b]--;
				update1(a,b);
				update2(a,b);
				cout<<1<<endl;
			}
			else cout<<0<<endl;
		}
	}
	
}

Compilation message

furniture.cpp:52:7: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
   52 |  main(){
      |       ^

Subtask #1
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 1356 KB Output is correct
2 Correct 9 ms 1612 KB Output is correct
3 Correct 10 ms 1644 KB Output is correct
4 Correct 18 ms 1616 KB Output is correct
5 Correct 24 ms 1792 KB Output is correct
6 Correct 22 ms 1864 KB Output is correct
7 Correct 23 ms 1860 KB Output is correct
8 Correct 22 ms 1864 KB Output is correct
9 Correct 26 ms 1864 KB Output is correct

Subtask #2
95.0 / 95.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 1356 KB Output is correct
2 Correct 9 ms 1612 KB Output is correct
3 Correct 10 ms 1644 KB Output is correct
4 Correct 18 ms 1616 KB Output is correct
5 Correct 24 ms 1792 KB Output is correct
6 Correct 22 ms 1864 KB Output is correct
7 Correct 23 ms 1860 KB Output is correct
8 Correct 22 ms 1864 KB Output is correct
9 Correct 26 ms 1864 KB Output is correct
10 Correct 53 ms 1544 KB Output is correct
11 Correct 14 ms 1100 KB Output is correct
12 Correct 743 ms 25000 KB Output is correct
13 Correct 123 ms 23236 KB Output is correct
14 Correct 1849 ms 24732 KB Output is correct
15 Correct 1982 ms 33020 KB Output is correct
16 Correct 2117 ms 34772 KB Output is correct
17 Correct 2201 ms 36156 KB Output is correct
18 Correct 2120 ms 35012 KB Output is correct
19 Correct 2301 ms 36732 KB Output is correct
20 Correct 2228 ms 36436 KB Output is correct
21 Correct 2293 ms 36636 KB Output is correct