Submission #307143

#	Time	Username	Problem	Language	Result	Execution time	Memory
307143		Hemimor	Awesome Arrowland Adventure (eJOI19_adventure)	C++14	100 / 100	139 ms	21740 KiB

adventure

#include <algorithm>
#include <iostream>
#include <iomanip>
#include <numeric>
#include <cassert>
#include <vector>
#include <random>
#include <cmath>
#include <queue>
#include <set>
#include <map>
#define syosu(x) fixed<<setprecision(x)
using namespace std;
typedef long long ll;
typedef unsigned int uint;
typedef unsigned long long ull;
typedef pair<int,int> P;
typedef pair<double,double> pdd;
typedef pair<ll,ll> pll;
typedef vector<int> vi;
typedef vector<vi> vvi;
typedef vector<double> vd;
typedef vector<vd> vvd;
typedef vector<ll> vl;
typedef vector<vl> vvl;
typedef vector<string> vs;
typedef vector<P> vp;
typedef vector<vp> vvp;
typedef vector<pll> vpll;
typedef pair<int,P> pip;
typedef vector<pip> vip;
const int inf=1<<30;
const ll INF=1ll<<60;
const double pi=acos(-1);
const double eps=1e-8;
const ll mod=1e9+7;
const int dx[4]={-1,0,1,0},dy[4]={0,1,0,-1};

vi vin(int n,int d=0){
	vi a(n);
	for(auto &i:a){
		cin>>i;
		i-=d;
	}
	return a;
}

vl vln(int n,int d=0){
	vl a(n);
	for(auto &i:a){
		cin>>i;
		i-=d;
	}
	return a;
}

vvi gin(int n,int m,int d=1){
	vvi g(n);
	for(int i=0;i<m;i++){
		int u,v;
		cin>>u>>v;
		u-=d,v-=d;
		g[u].push_back(v);
		g[v].push_back(u);
	}
	return g;
}

void vout(vi a){
	int n=a.size();
	cout<<n<<" :";
	for(auto i:a) cout<<' '<<i;
	cout<<endl;
}

class Graph{
	private:
	int n;
	vvp g;
	public:
	vi DIJ(int s){
		priority_queue<P> q;
		vi d(n,inf);
		d[s]=0;
		q.push({0,s});
		while(!q.empty()){
			P p=q.top();
			q.pop();
			int v=p.second;
			if(d[v]<-p.first) continue;
			for(auto i:g[v]){
				int u=i.first,D=d[v]+i.second;
				if(d[u]>D){
					d[u]=D;
					q.push({-D,u});
				}
			}
		}
		return d;
	}
	Graph(int v){
		n=v;
		g=vvp(v);
	}
	void add_edge(int s,int t,int c){
		g[s].push_back({t,c});
	}
};

int n,m;
vs a;

int main(){
	cin>>n>>m;
	a=vs(n);
	for(auto &s:a) cin>>s;
	Graph g(n*m);
	for(int i=0;i<n;i++) for(int j=0;j<m;j++) if(a[i][j]!='X'){
		int id;
		if(a[i][j]=='N') id=0;
		if(a[i][j]=='E') id=1;
		if(a[i][j]=='S') id=2;
		if(a[i][j]=='W') id=3;
		for(int k=0;k<4;k++){
			int x=i+dx[(id+k)%4],y=j+dy[(id+k)%4];
			if(x>=0&&x<n&&y>=0&&y<m) g.add_edge(i*m+j,x*m+y,k);
		}
	}
	vi d=g.DIJ(0);
	int res=d.back();
	if(res==inf) res=-1;
	cout<<res<<endl;
}

Compilation message (stderr)

adventure.cpp: In function 'int main()':
adventure.cpp:119:7: warning: 'id' may be used uninitialized in this function [-Wmaybe-uninitialized]
  119 |   int id;
      |       ^~

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