Submission #457700

#	Time	Username	Problem	Language	Result	Execution time	Memory
457700		SamAnd	Awesome Arrowland Adventure (eJOI19_adventure)	C++17	28 / 100	1 ms	332 KiB

adventure

#include <bits/stdc++.h>
using namespace std;
#define m_p make_pair
#define all(x) (x).begin(),(x).end()
#define sz(x) ((int)(x).size())
#define fi first
#define se second
typedef long long ll;
mt19937 rnd(chrono::steady_clock::now().time_since_epoch().count());
mt19937 rnf(2106);
const int N = 502;
const int xx[4] = {0, 1, 0, -1};
const int yy[4] = {1, 0, -1, 0};
const char cc[4] = {'E', 'S', 'W', 'N'};

int n, m;
char a[N][N];

struct ban
{
    int x, y, d;
    ban(){}
    ban(int x, int y, int d)
    {
        this->x = x;
        this->y = y;
        this->d = d;
    }
};
bool operator<(const ban& a, const ban& b)
{
    return a.d > b.d;
}

bool c[N][N];

void solv()
{
    cin >> n >> m;
    for (int i = 1; i <= n; ++i)
        cin >> (a[i] + 1);

    priority_queue<ban> q;
    q.push(ban(n, m, 0));
    while (!q.empty())
    {
        ban t;
        do
        {
            if (q.empty())
            {
                cout << "-1\n";
                return;
            }
            t = q.top();
            q.pop();
        } while (c[t.x][t.y]);
        c[t.x][t.y] = true;
        if (t.x == 1 && t.y == 1)
        {
            cout << t.d << "\n";
            return;
        }
        for (int i = 0; i < 4; ++i)
        {
            int hx = t.x + xx[i];
            int hy = t.y + yy[i];
            if (1 <= hx && hx <= n && 1 <= hy && hy <= m)
            {
                int j = (i + 2) % 4;
                int u = -1;
                for (int k = 0; k < 4; ++k)
                {
                    if (a[hx][hy] == cc[k])
                    {
                        u = k;
                        break;
                    }
                }
                if (u != -1)
                {
                    int dd;
                    if (u <= j)
                        dd = j - u;
                    else
                        dd = j + 4 - u;
                    q.push(ban(hx, hy, t.d + dd));
                }
            }
        }
    }
}

int main()
{
    #ifdef SOMETHING
    freopen("input.txt", "r", stdin);
    //freopen("output.txt", "w", stdout);
    #endif // SOMETHING
    ios_base::sync_with_stdio(false), cin.tie(0);

    int tt = 1;
    //cin >> tt;
    while (tt--)
    {
        solv();
    }
    return 0;
}

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