Submission #1153665

#	Time	Username	Problem	Language	Result	Execution time	Memory
1153665		vladilius	Maze (JOI23_ho_t3)	C++20	8 / 100	1941 ms	1212840 KiB

Main

#include <bits/stdc++.h>
using namespace std;
using ll = long long;
using pii = pair<int, int>;
#define pb push_back
#define ff first
#define ss second

int main(){
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);
    
    int r, c, n, sx, sy, ex, ey; cin>>r>>c>>n>>sx>>sy>>ex>>ey;
    vector<vector<char>> a(r + 1, vector<char>(c + 1));
    vector<vector<vector<pii>>> adj(r + 1, vector<vector<pii>>(c + 1));
    set<int> st[r + 1];
    for (int i = 1; i <= r; i++){
        for (int j = 1; j <= c; j++){
            cin>>a[i][j];
            if (i > 1) adj[i][j].pb({i - 1, j});
            if (j > 1) adj[i][j].pb({i, j - 1});
            if (i < r) adj[i][j].pb({i + 1, j});
            if (j < c) adj[i][j].pb({i, j + 1});
            st[i].insert(j);
        }
    }
    
    vector<vector<int>> dist(r + 1, vector<int>(c + 1, 1e9));
    queue<pii> q1, q2;
    queue<pii> q[r * c + 1]; q[0].push({sx, sy});
    dist[sx][sy] = 0; st[sx].erase(sy);
    
    auto move = [&](int x, int y){
        if (a[x][y] == '.') q1.push({x, y});
        for (auto [x1, y1]: adj[x][y]){
            if (a[x1][y1] == '.'){
                if (dist[x1][y1] == 1e9){
                    dist[x1][y1] = dist[x][y];
                    st[x1].erase(y1);
                    q[dist[x1][y1]].push({x1, y1});
                }
                q1.push({x1, y1});
            }
        }
        while (!q1.empty()){
            auto [x1, y1] = q1.front(); q1.pop();
            for (auto [x2, y2]: adj[x1][y1]){
                if (a[x2][y2] == '.' && dist[x2][y2] == 1e9){
                    dist[x2][y2] = dist[x][y];
                    st[x2].erase(y2);
                    q[dist[x2][y2]].push({x2, y2});
                    q1.push({x2, y2});
                }
            }
        }
    };

    for (int i = 0; i <= r * c; i++){
        while (!q[i].empty()){
            auto [x, y] = q[i].front(); q[i].pop();
            move(x, y);
            if (x == ex && y == ey){
                cout<<dist[x][y]<<"\n";
                return 0;
            }
            
            int L = y - n, R = y + n;
            q2.push({x, y});
            while (!q2.empty()){
                auto [x1, y1] = q2.front(); q2.pop();
                int L1 = L + (abs(x1 - x) == n), R1 = R - (abs(x1 - x) == n);
                if (!(abs(x1 - x) <= n && L1 <= y1 && y1 <= R1)){
                    continue;
                }
                if (dist[x1][y1] == 1e9){
                    dist[x1][y1] = dist[x][y] + 1;
                    q[dist[x1][y1]].push({x1, y1});
                    st[x1].erase(y1);
                }
                for (auto [x2, y2]: adj[x1][y1]){
                    if (dist[x2][y2] > dist[x1][y1]){
                        q2.push({x2, y2});
                    }
                }
            }
        }
    }
}

• Subtask 1: 8 / 8
• Subtask 2: 0 / 19
• Subtask 3: 0 / 16
• Subtask 4: 0 / 19
• Subtask 5: 0 / 5
• Subtask 6: 0 / 19
• Subtask 7: 0 / 8
• Subtask 8: 0 / 6