Submission #260308

#TimeUsernameProblemLanguageResultExecution timeMemory
260308arnold518Nautilus (BOI19_nautilus)C++14
66 / 100
1102 ms197592 KiB
#include <bits/stdc++.h>
using namespace std;

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

const int MAXN = 500;
const int MAXM = 5000;

int R, C, M;
char S[MAXN+10][MAXN+10];
char A[MAXM+10];
int B[MAXN+10][MAXN+10];
int adj[(1<<20)+10];
int D[MAXN+10][MAXN/20+10][MAXM+10];

int main()
{
	scanf("%d%d%d", &R, &C, &M);
	for(int i=1; i<=R; i++) scanf("%s", S[i]+1);
	scanf("%s", A+1);

	for(int i=1; i<=R; i++) for(int j=1; j<=C; j++) if(S[i][j]=='.') B[i][j/20]|=(1<<(j%20));
	for(int i=1; i<=R; i++) for(int j=0; j<=C/20; j++) D[i][j][0]=B[i][j];

	for(int i=0; i<(1<<20); i++)
	{
		for(int j=0; j<20; j++)
		{
			int t=0;
			if(j!=0 && (i&(1<<(j-1)))) t=1;
			if(j!=19 && (i*(1<<(j+1)))) t=1;
			adj[i]|=(t<<j);
		}
	}

	for(int p=1; p<=M; p++)
	{
		if(A[p]=='N')
		{
			for(int i=1; i<R; i++) for(int j=0; j<=C/20; j++)
			{
				D[i][j][p]=D[i+1][j][p-1];
				D[i][j][p]&=B[i][j];
			}
		}
		if(A[p]=='S')
		{
			for(int i=2; i<=R; i++) for(int j=0; j<=C/20; j++)
			{
				D[i][j][p]=D[i-1][j][p-1];
				D[i][j][p]&=B[i][j];
			}	
		}
		if(A[p]=='E')
		{
			for(int i=1; i<=R; i++)
			{
				for(int j=C/20; j>=0; j--)
				{
					D[i][j][p]=D[i][j][p-1]<<1;
					D[i][j][p]&=((1<<20)-1);
					if(j!=0 && (D[i][j-1][p-1]&(1<<19))) D[i][j][p]|=1;
					D[i][j][p]&=B[i][j];
				}
			}
		}
		if(A[p]=='W')
		{
			for(int i=1; i<=R; i++)
			{
				for(int j=0; j<=C/20; j++)
				{
					D[i][j][p]=D[i][j][p-1]>>1;
					if(j!=C/20 && (D[i][j+1][p-1]&1)) D[i][j][p]|=(1<<19);
					D[i][j][p]&=B[i][j];
				}
			}
		}
		if(A[p]=='?')
		{
			for(int i=1; i<R; i++) for(int j=0; j<=C/20; j++)
			{
				int t;
				t=D[i+1][j][p-1];
				D[i][j][p]|=t;
			}
			for(int i=2; i<=R; i++) for(int j=0; j<=C/20; j++)
			{
				int t;
				t=D[i-1][j][p-1];
				D[i][j][p]|=t;
			}
			for(int i=1; i<=R; i++)
			{
				for(int j=C/20; j>=0; j--)
				{
					int t;
					t=D[i][j][p-1]<<1;
					t&=((1<<20)-1);
					if(j!=0 && (D[i][j-1][p-1]&(1<<19))) t|=1;
					D[i][j][p]|=t;
				}
			}
			for(int i=1; i<=R; i++)
			{
				for(int j=0; j<=C/20; j++)
				{
					int t;
					t=D[i][j][p-1]>>1;
					if(j!=C/20 && (D[i][j+1][p-1]&1)) t|=(1<<19);
					t&=B[i][j];
					D[i][j][p]|=t;
				}
			}
			for(int i=1; i<=R; i++) for(int j=0; j<=C/20; j++) D[i][j][p]&=B[i][j];
		}
	}
	int ans=0;
	for(int i=1; i<=R; i++) for(int j=0; j<=C/20; j++) ans+=__builtin_popcount(D[i][j][M]);
	printf("%d\n", ans);
}

Compilation message (stderr)

nautilus.cpp: In function 'int main()':
nautilus.cpp:33:18: warning: '*' in boolean context, suggest '&&' instead [-Wint-in-bool-context]
    if(j!=19 && (i*(1<<(j+1)))) t=1;
                ~~^~~~~~~~~~~~
nautilus.cpp:20:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d%d%d", &R, &C, &M);
  ~~~~~^~~~~~~~~~~~~~~~~~~~~~
nautilus.cpp:21:31: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  for(int i=1; i<=R; i++) scanf("%s", S[i]+1);
                          ~~~~~^~~~~~~~~~~~~~
nautilus.cpp:22:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%s", A+1);
  ~~~~~^~~~~~~~~~~
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