oj.uz

Submission #292911

# Submission time Handle Problem Language Result Execution time Memory
292911 2020-09-07T14:46:46 Z arnold518 Furniture (JOI20_furniture) C++14
100 / 100
 936 ms 38068 KB 
#include <bits/stdc++.h>
using namespace std;

typedef long long ll;
typedef pair<int, int> pii;
typedef pair<ll, ll> pll;

const int MAXN = 2000;

int N, M, Q, A[MAXN+10][MAXN+10];
int dp1[MAXN+10][MAXN+10], dp2[MAXN+10][MAXN+10];
int S[MAXN+10][MAXN+10], C[MAXN+10];

int main()
{
	scanf("%d%d", &N, &M);
	for(int i=1; i<=N; i++) for(int j=1; j<=M; j++) scanf("%d", &A[i][j]);

	for(int i=1; i<=N; i++) for(int j=1; j<=M; j++)
	{
		if(i==1 && j==1) dp1[i][j]=1;
		else if(A[i][j]) dp1[i][j]=0;
		else dp1[i][j]=dp1[i-1][j]|dp1[i][j-1];
	}

	for(int i=N; i>=1; i--) for(int j=M; j>=1; j--)
	{
		if(i==N && j==M) dp2[i][j]=1;
		else if(A[i][j]) dp2[i][j]=0;
		else dp2[i][j]=dp2[i+1][j]|dp2[i][j+1];
	}

	for(int i=1; i<=N; i++) for(int j=1; j<=M; j++)
	{
		if(A[i][j]==0 && dp1[i][j]==1) S[i+j][i]++;
		if(A[i][j]==0 && dp2[i][j]==1) S[i+j][i]++;
		if(S[i+j][i]==2) C[i+j]++;
	}

	scanf("%d", &Q);
	for(int p=1; p<=Q; p++)
	{
		int y, x;
		scanf("%d%d", &y, &x);
			
		bool flag;
		if(dp1[y][x]==0 || dp2[y][x]==0) flag=true;
		else
		{
			if(C[y+x]>=2) flag=true;
			else flag=false;
		}

		printf("%d\n", flag);
		if(!flag) continue;

		queue<pii> Q;
		if(dp1[y][x])
		{	
			Q.push({y, x}); dp1[y][x]=0;
			while(!Q.empty())
			{
				pii now=Q.front(); Q.pop();
				int y=now.first, x=now.second;
				if(S[y+x][y]==2) C[y+x]--;
				S[y+x][y]--;

				if(dp1[y+1][x] && !dp1[y+1][x-1])
				{
					dp1[y+1][x]=0;
					Q.push({y+1, x});
				}
				if(dp1[y][x+1] && !dp1[y-1][x+1])
				{
					dp1[y][x+1]=0;
					Q.push({y, x+1});
				}
			}
		}

		if(dp2[y][x])
		{
			Q.push({y, x}); dp2[y][x]=0;
			while(!Q.empty())
			{
				pii now=Q.front(); Q.pop();
				int y=now.first, x=now.second;
				if(S[y+x][y]==2) C[y+x]--;
				S[y+x][y]--;

				if(dp2[y-1][x] && !dp2[y-1][x+1])
				{
					dp2[y-1][x]=0;
					Q.push({y-1, x});
				}
				if(dp2[y][x-1] && !dp2[y+1][x-1])
				{
					dp2[y][x-1]=0;
					Q.push({y, x-1});
				}
			}
		}
	}
}

Compilation message

furniture.cpp: In function 'int main()':
furniture.cpp:16:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   16 |  scanf("%d%d", &N, &M);
      |  ~~~~~^~~~~~~~~~~~~~~~
furniture.cpp:17:55: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   17 |  for(int i=1; i<=N; i++) for(int j=1; j<=M; j++) scanf("%d", &A[i][j]);
      |                                                  ~~~~~^~~~~~~~~~~~~~~~
furniture.cpp:40:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   40 |  scanf("%d", &Q);
      |  ~~~~~^~~~~~~~~~
furniture.cpp:44:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   44 |   scanf("%d%d", &y, &x);
      |   ~~~~~^~~~~~~~~~~~~~~~

Subtask #1
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 1920 KB Output is correct
2 Correct 4 ms 2176 KB Output is correct
3 Correct 5 ms 2304 KB Output is correct
4 Correct 7 ms 2432 KB Output is correct
5 Correct 9 ms 2432 KB Output is correct
6 Correct 9 ms 2560 KB Output is correct
7 Correct 9 ms 2560 KB Output is correct
8 Correct 8 ms 2560 KB Output is correct
9 Correct 7 ms 2560 KB Output is correct

Subtask #2
95.0 / 95.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 1920 KB Output is correct
2 Correct 4 ms 2176 KB Output is correct
3 Correct 5 ms 2304 KB Output is correct
4 Correct 7 ms 2432 KB Output is correct
5 Correct 9 ms 2432 KB Output is correct
6 Correct 9 ms 2560 KB Output is correct
7 Correct 9 ms 2560 KB Output is correct
8 Correct 8 ms 2560 KB Output is correct
9 Correct 7 ms 2560 KB Output is correct
10 Correct 23 ms 5880 KB Output is correct
11 Correct 6 ms 2176 KB Output is correct
12 Correct 392 ms 35448 KB Output is correct
13 Correct 120 ms 32888 KB Output is correct
14 Correct 710 ms 34744 KB Output is correct
15 Correct 777 ms 33784 KB Output is correct
16 Correct 871 ms 35832 KB Output is correct
17 Correct 936 ms 37340 KB Output is correct
18 Correct 851 ms 36448 KB Output is correct
19 Correct 855 ms 38068 KB Output is correct
20 Correct 676 ms 38012 KB Output is correct
21 Correct 805 ms 38008 KB Output is correct