Submission #467830

#	Time	Username	Problem	Language	Result	Execution time	Memory
467830		jurgis	Awesome Arrowland Adventure (eJOI19_adventure)	C++14	34 / 100	1 ms	460 KiB

adventure

#include <iostream>
#include <bits/stdc++.h>
using namespace std;
#define pii pair<int, int>
#define fi first
#define se second
#define p push
#define pb push_back
#define F(end) for(int i=0; i<end; i++)
#define ll long long
int m, n; const int inf = 1e9;
bool vis[501]; ll dist[501];
vector<pii> adj[501];
priority_queue<pii,vector<pii>, greater<pii>> q;
int pirmine[501];
void dijkstra(int x){
    for(int i=0; i<m*n; i++){
        vis[i] = false; dist[i] = inf; pirmine[i] =-1;
    }
    dist[x] = 0;
    q.p({dist[x], x});
    while(!q.empty()){
        int v = q.top().se; q.pop();
        if(vis[v])continue;
        vis[v] = true;
        for(auto u: adj[v]){
            int j = u.fi; int w = u.se;

            if(dist[v] +w < dist[j]){
                dist[j] = dist[v] +w;
                pirmine[j] = v;
                q.p({dist[j], j});
            }
        }
    }

}
int main()
{
     cin>>m>>n; string s[m];
    F(m)cin>>s[i];
    F(m){
        for(int a=0; a<n-1; a++){
            if(s[i][a] == 'E')adj[a + i*n].pb({a+i*n +1, 0});
            if(s[i][a] == 'N')adj[a + i*n].pb({a+i*n +1, 1});
            if(s[i][a] == 'W')adj[a + i*n].pb({a+i*n +1, 2});
            if(s[i][a] == 'S')adj[a + i*n].pb({a+i*n +1, 3});

        }
    }
    F(m){
        for(int a=1; a<n; a++){
            if(s[i][a] == 'W')adj[a + i*n].pb({a+i*n -1, 0});
            if(s[i][a] == 'S')adj[a + i*n].pb({a+i*n -1, 1});
            if(s[i][a] == 'E')adj[a + i*n].pb({a+i*n -1, 2});
            if(s[i][a] == 'N')adj[a + i*n].pb({a+i*n -1, 3});

        }
    }
    F(n){
        for(int a=0; a<m-1; a++){
            if(s[a][i] == 'S')adj[a*n + i].pb({(a+1)*n + i, 0});
            if(s[a][i] == 'E')adj[a*n + i].pb({(a+1)*n + i, 1});
            if(s[a][i] == 'N')adj[a*n + i].pb({(a+1)*n + i, 2});
            if(s[a][i] == 'W')adj[a*n + i].pb({(a+1)*n + i, 3});

        }
    }
    F(n){
        for(int a=1; a<m; a++){
            if(s[a][i] == 'N')adj[a*n + i].pb({(a-1)*n + i, 0});
            if(s[a][i] == 'W')adj[a*n + i].pb({(a-1)*n + i, 1});
            if(s[a][i] == 'S')adj[a*n + i].pb({(a-1)*n + i, 2});
            if(s[a][i] == 'E')adj[a*n + i].pb({(a-1)*n + i, 3});

        }
    }
    dijkstra(0);
     int d = pirmine[n*m-1]; //cout<<d<<endl;
     //for(auto i: adj[0])cout<<i.fi<<i.se<<endl;
    //cout<<dist[4];
    if(dist[n*m-1] == inf){
        cout<<-1;
    }
    else{
        cout<<dist[n*m-1]<<endl;

    }

}

Compilation message (stderr)

adventure.cpp: In function 'int main()':
adventure.cpp:79:10: warning: unused variable 'd' [-Wunused-variable]
   79 |      int d = pirmine[n*m-1]; //cout<<d<<endl;
      |          ^

• Subtask 1: 10 / 10
• Subtask 2: 12 / 12
• Subtask 3: 12 / 12
• Subtask 4: 0 / 16
• Subtask 5: 0 / 50