Submission #750288

#	Time	Username	Problem	Language	Result	Execution time	Memory
750288		7as__7	Awesome Arrowland Adventure (eJOI19_adventure)	C++17	0 / 100	6 ms	4932 KiB

adventure

#include <bits/stdc++.h>
using namespace std;
#define int long long
#define pii pair<int, int>
#define all(x) x.begin(),x.end()
const int sz = 1e6 + 1, mod = 1e9 + 7, inf = -1e18;
int dp[10001][1001] = {};
int change(char a, char b) {
    if (a == 'N') {
        int ans = 0;
        if (b == 'N')return ans;
        ans++;
        if (b == 'E')return ans;
        ans++;
        if (b == 'S')return ans;
        ans++;
        if (b == 'W')return ans;
        return ans;
    }
    if (a == 'W') {
        int ans = 0;
        if (b == 'W')return ans;
        ans++;
        if (b == 'N')return ans;
        ans++;
        if (b == 'E')return ans;
        ans++;
        if (b == 'S')return ans;
        return ans;
    }
    if (a == 'S') {
        int ans = 0;
        if (b == 'S')return ans;
        ans++;
        if (b == 'W')return ans;
        ans++;
        if (b == 'N')return ans;
        ans++;
        if (b == 'E')return ans;
        return ans;
    }
    if (a == 'E') {
        int ans = 0;
        if (b == 'E')return ans;
        ans++;
        if (b == 'S')return ans;
        ans++;
        if (b == 'W')return ans;
        ans++;
        if (b == 'N')return ans;
        return ans;
    }
    return 0;
}
signed main()
{
    int n, m;
    cin >> n >> m;
    char a[502][502] = {};
    int cost[502][502] = {};
    vector<vector<int>>vc(n * m + 1);
    for (int i = 1; i <= n; i++) {
        for (int j = 1; j <= m; j++) {
            cin >> a[i][j];
        }
    }
    for (int i = 1; i <= n; i++) {
        for (int j = 1; j <= m; j++) {
            if (a[i][j] != 'X' && j > 1) {
                vc[m * (i - 1) + j].push_back(m * (i - 1) + j - 1);
                cost[m * (i - 1) + j][m * (i - 1) + j - 1] = change(a[i][j], 'W');
            }
            if (a[i][j] != 'X' && j < m) {
                vc[m * (i - 1) + j].push_back(m * (i - 1) + j + 1);
                cost[m * (i - 1) + j][m * (i - 1) + j + 1] = change(a[i][j], 'E');
            }
            if (a[i][j] != 'X' && i > 1) {
                vc[m * (i - 1) + j].push_back(m * (i - 2) + j);
                cost[m * (i - 1) + j][m * (i - 2) + j] = change(a[i][j], 'N');
            }
            if (a[i][j] != 'X' && i < n) {
                vc[m * (i - 1) + j].push_back(m * (i)+j);
                cost[m * (i - 1) + j][m * (i)+j] = change(a[i][j], 'S');
            }
        }
    }
    priority_queue<pair<int, int>, vector<pair<int, int>>, greater<pair<int, int>>>pq;
    vector<int>ans(n * m + 1, 1e18);
    ans[1] = 0;
    pq.push({ 0,1 });
    while (!pq.empty()) {
        int u = pq.top().second;
        int cos = pq.top().first;
        //cout << u << ' ' << cos << endl;
        pq.pop();
        if (ans[u] < cos) {
            continue;
        }
        for (auto i : vc[u]) {
            if (cos + cost[u][i] < ans[i]) {
                ans[i] = cos + cost[u][i];
                pq.push({ ans[i],i });
            }
        }
    }
    cout << ans[n * m];
    //cout << ans[m * (n - 1) + m];
}

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