Submission #226699

#	Time	Username	Problem	Language	Result	Execution time	Memory
226699		Pajaraja	Awesome Arrowland Adventure (eJOI19_adventure)	C++17	100 / 100	268 ms	14932 KiB

adventure

#include <bits/stdc++.h>
#define MAXN 507
using namespace std;
int ind[MAXN][MAXN],dist[MAXN][MAXN],dx[4]={0,1,0,-1},dy[4]={-1,0,1,0},n,m;
void dijkstra()
{
	for(int i=0;i<n;i++) for(int j=0;j<m;j++) dist[i][j]=-1;
	priority_queue<pair<int,pair<int,int>>,vector<pair<int,pair<int,int>> >, greater<pair<int,pair<int,int> > > > pq;
	pq.push(make_pair(0,make_pair(0,0)));
	while(!pq.empty())
	{
		int x=pq.top().second.first,y=pq.top().second.second,c=pq.top().first;
		pq.pop();
		if(x<0 || x>=m || y<0 || y>=n || dist[y][x]!=-1) continue;
		dist[y][x]=c;
		if(ind[y][x]==-1) continue;
		for(int i=0;i<4;i++) pq.push(make_pair(c+i,make_pair(x+dx[(ind[y][x]+i)%4],y+dy[(ind[y][x]+i)%4])));
	}
}
int main()
{
	cin>>n>>m;
	for(int i=0;i<n;i++) for(int j=0;j<m;j++)
	{
		char c; cin>>c;
		if(c=='N') ind[i][j]=0;
		if(c=='E') ind[i][j]=1;
		if(c=='S') ind[i][j]=2;
		if(c=='W') ind[i][j]=3;
		if(c=='X') ind[i][j]=-1;
	}
	dijkstra();
	cout<<dist[n-1][m-1];
}

• Subtask 1: 10 / 10
• Subtask 2: 12 / 12
• Subtask 3: 12 / 12
• Subtask 4: 16 / 16
• Subtask 5: 50 / 50