Submission #1056950

#	Time	Username	Problem	Language	Result	Execution time	Memory
1056950		goduadzesaba	Awesome Arrowland Adventure (eJOI19_adventure)	C++17	100 / 100	62 ms	28140 KiB

adventure

#include <bits/stdc++.h>
using namespace std;
#define int long long
const int N=505,mod=1e9+7;
int n,m,x,y[5],d[N*N]; char ch; 
vector <pair<int,int> > v[N*N];
set <pair<int,int> > s;
signed main(){
    ios_base::sync_with_stdio(0);
	cin.tie(0); cout.tie(0);
	cin>>n>>m;
	for (int i=0; i<n; i++)
		for (int j=0; j<m; j++){
			cin>>ch; d[i*m+j]=1e18;
			if (ch=='N'){
				y[0]=3; y[1]=1;
				y[2]=0; y[3]=2;
			}
			if (ch=='S'){
				y[0]=1; y[1]=3;
				y[2]=2; y[3]=0;
			}
			if (ch=='E'){
				y[0]=2; y[1]=0;
				y[2]=3; y[3]=1;
			}
			if (ch=='W'){
				y[0]=0; y[1]=2;
				y[2]=1; y[3]=3;
			}
			if (ch!='X'){
				if (j>0) v[i*m+j].push_back({i*m+j-1,y[0]});
				if (j<m-1) v[i*m+j].push_back({i*m+j+1,y[1]});
				if (i>0) v[i*m+j].push_back({(i-1)*m+j,y[2]});
				if (i<n-1) v[i*m+j].push_back({(i+1)*m+j,y[3]});
			}
		}
	s.insert({0,0}); d[0]=0;
	while (!s.empty()){
		x=s.begin()->second; s.erase(s.begin());
		for (auto i:v[x]){
			if (d[i.first]>d[x]+i.second){
				s.erase({d[i.first],i.first});
				d[i.first]=d[x]+i.second;
				s.insert({d[i.first],i.first});
			}
		}
	}
	cout<<(d[n*m-1]==1e18?-1:d[n*m-1]);
}

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