Submission #1197828

#	Time	Username	Problem	Language	Result	Execution time	Memory
1197828		Hanksburger	Awesome Arrowland Adventure (eJOI19_adventure)	C++20	100 / 100	89 ms	26808 KiB

adventure

#include <bits/stdc++.h>
using namespace std;
vector<pair<pair<int, int>, int> > adj[505][505];
priority_queue<pair<int, pair<int, int> > > pq;
int dist[505][505], final[505][505];
int main()
{
    ios::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);
    int n, m;
    cin >> n >> m;
    for (int i=1; i<=n; i++)
    {
        for (int j=1; j<=m; j++)
        {
            dist[i][j]=1e9;
            char c;
            cin >> c;
            if (c=='X')
                continue;
            int x, y;
            if (c=='E')
                x=0, y=1;
            else if (c=='S')
                x=1, y=0;
            else if (c=='W')
                x=0, y=-1;
            else
                x=-1, y=0;
            for (int k=0; k<4; k++)
            {
                if (1<=i+x && i+x<=n && 1<=j+y && j+y<=m)
                    adj[i][j].push_back({{i+x, j+y}, k});
                swap(x, y);
                y=-y;
            }
        }
    }
    dist[1][1]=0;
    pq.push({-dist[1][1], {1, 1}});
    while (!pq.empty())
    {
        int ux=pq.top().second.first, uy=pq.top().second.second;
        pq.pop();
        if (final[ux][uy])
            continue;
        final[ux][uy]=1;
        for (int i=0; i<adj[ux][uy].size(); i++)
        {
            int vx=adj[ux][uy][i].first.first, vy=adj[ux][uy][i].first.second, w=adj[ux][uy][i].second;
            if (dist[vx][vy]>dist[ux][uy]+w)
            {
                dist[vx][vy]=dist[ux][uy]+w;
                pq.push({-dist[vx][vy], {vx, vy}});
            }
        }
    }
    cout << (dist[n][m]<1e6?dist[n][m]:-1);
}

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