oj.uz

Submission #296920

# Submission time Handle Problem Language Result Execution time Memory
296920 2020-09-11T05:02:37 Z nafis_shifat Furniture (JOI20_furniture) C++14
100 / 100
 550 ms 19748 KB 
#include<bits/stdc++.h>
#define ll long long
#define pii pair<int,int>
using namespace std;
const int mxn=1e5+5;
const int inf=1e9;
int a[1002][1002]={};

int cnt[3000]={};

int di[]={0,0,-1,1};
int dj[]={-1,1,0,0};
bool f=false;
int n,m;
vector<pii> v;
void dfs(int i,int j) {
	if(a[i][j]) return;

	int v1=a[i][j+1]+a[i+1][j];
	int v2=a[i-1][j]+a[i][j-1];

	if(v1!=2 && v2!=2) return;

	a[i][j]=1; 
	cnt[i+j]--;
	
	v.push_back({i,j});

	if(i==1 && j==1) {
	    a[i][j]=0;
	    if(v1==2) {
		    f=true;
	    }
	    return;
	}
	
	if(i==n && j==m) {
	    a[i][j]=0;
	    if(v2==2) {
	        f=true;
	    }
	    return;
	}
	
	

	for(int k=0;k<4;k++) {
		int ii=i+di[k];
		int jj=j+dj[k];
		dfs(ii,jj);
	}



}

int main() {

	cin>>n>>m;

	for(int i=0;i<=m+1;i++) {
		a[0][i]=1;
		a[n+1][i]=1;
	}
	for(int i=0;i<=n+1;i++) {
		a[i][0]=a[i][m+1]=1;
	}

	for(int i=1;i<=n;i++) for(int j=1;j<=m;j++) cnt[i+j]++;


	for(int i=1;i<=n;i++) {
		for(int j=1;j<=m;j++) {
			int x;
			scanf("%d",&x);
			if(!x) continue;
			a[i][j]=x;

			for(int k=0;k<4;k++) {
				int ii=i+di[k];
				int jj=j+dj[k];
				dfs(ii,jj);
			}
		}
	}
	


	int q;
	cin>>q;

	while(q--) {
	    v.clear();
		int i,j;
		scanf("%d%d",&i,&j);

		if(a[i][j]==1) {
			printf("1\n");
			continue;
		}
		if(cnt[i+j]==1) {
			printf("0\n");
			continue;
		}
		f=false;

		a[i][j]=1;
		cnt[i+j]--;

		for(int k=0;k<4;k++) {
			int ii=i+di[k];
			int jj=j+dj[k];
			dfs(ii,jj);
		}
		if(f) {
		    
			printf("0\n");
			a[i][j]=0;
			cnt[i+j]++;
			
			for(pii x:v) {
			    a[x.first][x.second]=0;
			    cnt[x.first+x.second]++;
			}

		} else {
			printf("1\n");
		}

	}
	
}

Compilation message

furniture.cpp: In function 'int main()':
furniture.cpp:75:9: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   75 |    scanf("%d",&x);
      |    ~~~~~^~~~~~~~~
furniture.cpp:95:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   95 |   scanf("%d%d",&i,&j);
      |   ~~~~~^~~~~~~~~~~~~~

Subtask #1
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 640 KB Output is correct
2 Correct 3 ms 896 KB Output is correct
3 Correct 3 ms 768 KB Output is correct
4 Correct 5 ms 896 KB Output is correct
5 Correct 6 ms 1024 KB Output is correct
6 Correct 5 ms 896 KB Output is correct
7 Correct 5 ms 896 KB Output is correct
8 Correct 5 ms 896 KB Output is correct
9 Correct 5 ms 896 KB Output is correct

Subtask #2
95.0 / 95.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 640 KB Output is correct
2 Correct 3 ms 896 KB Output is correct
3 Correct 3 ms 768 KB Output is correct
4 Correct 5 ms 896 KB Output is correct
5 Correct 6 ms 1024 KB Output is correct
6 Correct 5 ms 896 KB Output is correct
7 Correct 5 ms 896 KB Output is correct
8 Correct 5 ms 896 KB Output is correct
9 Correct 5 ms 896 KB Output is correct
10 Correct 26 ms 1532 KB Output is correct
11 Correct 5 ms 640 KB Output is correct
12 Correct 251 ms 10092 KB Output is correct
13 Correct 111 ms 8036 KB Output is correct
14 Correct 550 ms 14700 KB Output is correct
15 Correct 420 ms 14324 KB Output is correct
16 Correct 437 ms 14852 KB Output is correct
17 Correct 475 ms 15608 KB Output is correct
18 Correct 441 ms 15352 KB Output is correct
19 Correct 488 ms 17508 KB Output is correct
20 Correct 418 ms 19748 KB Output is correct
21 Correct 456 ms 17892 KB Output is correct