Submission #1005878

#	Time	Username	Problem	Language	Result	Execution time	Memory
1005878		vjudge1	Awesome Arrowland Adventure (eJOI19_adventure)	C++17	100 / 100	227 ms	16364 KiB

adventure

#include <bits/stdc++.h>
// author : Pluton

#define OPT ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
#define int ll
#define ll long long
#define pb push_back
#define arr array
#define fi first
#define se second
#define rep(i, j, k) for (int i = j; i <= k; ++i)
#define all(a) a.begin(), a.end()
#define pii pair<int,int>
using namespace std;
const int INF = 1e18;

struct BIT {
    int n;
    vector<int> ft;

    void init(int N) {
        n = N + 5;
        ft.assign(n + 5, 0);
    }

    void add(int pos, int val) {
        for (pos = pos + 1; pos <= n; pos += pos & -pos) ft[pos] += val;
    }

    int get(int pos, int res = 0) {
        for (pos = pos + 1; pos > 0; pos -= pos & -pos) res += ft[pos];
        return res;
    }
};

map<char, vector<vector<int>>> d;
int n, m;

bool f(int x, int y) {
    if (x >= 0 && x < n && y >= 0 && y < m) {
        return true;
    }
    return false;
}

const int N = 505;
vector<vector<char>> g;
vector<vector<int>> cost;

int bfs() {
    priority_queue<vector<int>, vector<vector<int>>, greater<vector<int>>> q;
    q.push({0, 0, 0});
    cost[0][0] = 0;
    while (!q.empty()) {
        vector<int> u = q.top();
        q.pop();
        auto move = d[g[u[2]][u[1]]];
        for (auto e : move) {
            int x = e[0] + u[1];
            int y = e[1] + u[2];
            if (f(x, y) && cost[y][x] > cost[u[2]][u[1]] + e[2]) {
                cost[y][x] = cost[u[2]][u[1]] + e[2];
                q.push({cost[y][x], x, y});
            }
        }
    }
    return cost[m - 1][n - 1];
}

void _() {
    d['N'] = {{0, -1, 0}, {1, 0, 1}, {0, 1, 2}, {-1, 0, 3}};
d['E'] = {{0, -1, 3}, {1, 0, 0}, {0, 1, 1}, {-1, 0, 2}};
d['S'] = {{0, -1, 2}, {1, 0, 3}, {0, 1, 0}, {-1, 0, 1}};
d['W'] = {{0, -1, 1}, {1, 0, 2}, {0, 1, 3}, {-1, 0, 0}};
d['X'] = {};

    cin >> m >> n;
    for (int i = 0; i < m; ++i) {
        g.push_back({});
        cost.push_back({});
        for (int j = 0; j < n; ++j) {
            char c;
            cin >> c;
            g[i].push_back(c);
            cost[i].push_back(INF);
        }
    }
    int res = bfs();
    cout << (res == INF ? -1 : res);
}

signed main() {
    OPT
    int tc = 1;
    while (tc--) {
        _();
    }
    return 0;
}

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