oj.uz

Submission #277556

# Submission time Handle Problem Language Result Execution time Memory
277556 2020-08-21T05:52:20 Z JuliusMieliauskas Awesome Arrowland Adventure (eJOI19_adventure) C++14
100 / 100
 132 ms 22000 KB 
#include <bits/stdc++.h>

using namespace std;

#define all(x) x.begin(), x.end()
#define vi vector<int>
#define vll vector<long long>
#define MOD 1000000007
#define endl '\n'

typedef long long ll;

void print(vi v){
    cout<<"Contents of vector:\n";
    for(auto x : v) cout<<x<<" ";
    cout<<endl<<endl;
}

int dx[4] = {-1, 0, 1, 0};
int dy[4] = {0, -1, 0, 1};

vector<pair<int, int> > adj[509 * 509];

int m, n;
char ar[509][509];
int dists[509 * 509];

bool in(int i, int j){
    return (i >= 0) && (j >= 0) && (i<m) && (j<n);
}

void fillAdj(){
    for(int i = 0; i<m; i++){
        for(int j = 0; j<n; j++){
            if(ar[i][j] == 'E'){
                for(int k = 0; k<4; k++){
                    int ci = i + dy[k], cj = j + dx[k];

                    if(in(ci, cj)){
                        if(k == 0) { /// Going W
                            adj[i*n + j].push_back({ci*n + cj, 2});
                        }
                        if(k == 1) { /// Going N
                            adj[i*n + j].push_back({ci*n + cj, 3});
                        }
                        if(k == 2) { /// Going E
                            adj[i*n + j].push_back({ci*n + cj, 0});
                        }
                        if(k == 3) { /// Going S
                            adj[i*n + j].push_back({ci*n + cj, 1});
                        }
                    }
                }
            }
            if(ar[i][j] == 'W'){
                for(int k = 0; k<4; k++){
                    int ci = i + dy[k], cj = j + dx[k];

                    if(in(ci, cj)){
                        if(k == 0) { /// Going W
                            adj[i*n + j].push_back({ci*n + cj, 0});
                        }
                        if(k == 1) { /// Going N
                            adj[i*n + j].push_back({ci*n + cj, 1});
                        }
                        if(k == 2) { /// Going E
                            adj[i*n + j].push_back({ci*n + cj, 2});
                        }
                        if(k == 3) { /// Going S
                            adj[i*n + j].push_back({ci*n + cj, 3});
                        }
                    }
                }
            }
            if(ar[i][j] == 'S'){
                for(int k = 0; k<4; k++){
                    int ci = i + dy[k], cj = j + dx[k];

                    if(in(ci, cj)){
                        if(k == 0) { /// Going W
                            adj[i*n + j].push_back({ci*n + cj, 1});
                        }
                        if(k == 1) { /// Going N
                            adj[i*n + j].push_back({ci*n + cj, 2});
                        }
                        if(k == 2) { /// Going E
                            adj[i*n + j].push_back({ci*n + cj, 3});
                        }
                        if(k == 3) { /// Going S
                            adj[i*n + j].push_back({ci*n + cj, 0});
                        }
                    }
                }
            }
            if(ar[i][j] == 'N'){
                for(int k = 0; k<4; k++){
                    int ci = i + dy[k], cj = j + dx[k];

                    if(in(ci, cj)){
                        if(k == 0) { /// Going W
                            adj[i*n + j].push_back({ci*n + cj, 3});
                        }
                        if(k == 1) { /// Going N
                            adj[i*n + j].push_back({ci*n + cj, 0});
                        }
                        if(k == 2) { /// Going E
                            adj[i*n + j].push_back({ci*n + cj, 1});
                        }
                        if(k == 3) { /// Going S
                            adj[i*n + j].push_back({ci*n + cj, 2});
                        }
                    }
                }
            }
        }
    }
}

void dijkstra(int source){
    bool visited[n*m];
    for(int i = 0; i<m; i++){
        for(int j = 0; j<n; j++) dists[i*n + j] = INT_MAX;
    }
    for(int i = 0; i<m; i++) for(int j = 0; j<n; j++) visited[i*n + j] = false;
    priority_queue<pair<int, int>, vector<pair<int, int> >, greater<pair<int, int> > > pq;
    pq.push({0, source});
    dists[source] = 0;
    while (!pq.empty()) {
        int u = pq.top().second; pq.pop();

        if (visited[u]) continue;
        else visited[u] = true;
        //cout<<"From "<<u<<":"<<endl;
        for(auto v : adj[u]) {
            //cout<<v.first<<endl;
            if (dists[v.first] > dists[u] + v.second) {
                dists[v.first] = dists[u] + v.second;
                pq.push({dists[v.first], v.first});
            }
        }
        //cout<<endl;
    }
}

void solve(){
    cin>>m>>n;
    for(int i = 0; i<m; i++) for(int j = 0; j<n; j++) cin>>ar[i][j];
    fillAdj();
    dijkstra(0);

    /*for(int i = 0; i<m; i++){
        for(int j = 0; j<n; j++){
            cout<<dists[i*n + j]<<" ";
        }
        cout<<endl;
    }*/

    if(dists[m*n - 1] == INT_MAX) cout<<"-1"<<endl;
    else cout<<dists[m*n - 1]<<endl;
}

int main() {
    ios_base::sync_with_stdio(false); cin.tie(nullptr);
    //ifstream cin(""); ofstream cout("");///cia failai

    //int T; cin>>T;
    int T = 1;

    for(int it = 1; it<=T; it++){
        solve();

    }
}

Subtask #1
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 5 ms 6400 KB Output is correct
2 Correct 4 ms 6400 KB Output is correct
3 Correct 5 ms 6528 KB Output is correct
4 Correct 5 ms 6400 KB Output is correct
5 Correct 5 ms 6400 KB Output is correct
6 Correct 5 ms 6400 KB Output is correct
7 Correct 5 ms 6400 KB Output is correct
8 Correct 5 ms 6400 KB Output is correct
9 Correct 5 ms 6400 KB Output is correct
10 Correct 5 ms 6400 KB Output is correct

Subtask #2
12.0 / 12.0

# Verdict Execution time Memory Grader output
1 Correct 5 ms 6400 KB Output is correct
2 Correct 4 ms 6400 KB Output is correct
3 Correct 5 ms 6528 KB Output is correct
4 Correct 5 ms 6400 KB Output is correct
5 Correct 5 ms 6400 KB Output is correct
6 Correct 5 ms 6400 KB Output is correct
7 Correct 5 ms 6400 KB Output is correct
8 Correct 5 ms 6400 KB Output is correct
9 Correct 5 ms 6400 KB Output is correct
10 Correct 5 ms 6400 KB Output is correct
11 Correct 4 ms 6400 KB Output is correct
12 Correct 5 ms 6528 KB Output is correct
13 Correct 5 ms 6400 KB Output is correct
14 Correct 5 ms 6400 KB Output is correct
15 Correct 4 ms 6400 KB Output is correct
16 Correct 4 ms 6400 KB Output is correct
17 Correct 4 ms 6400 KB Output is correct
18 Correct 4 ms 6400 KB Output is correct
19 Correct 5 ms 6400 KB Output is correct
20 Correct 6 ms 6528 KB Output is correct

Subtask #3
12.0 / 12.0

# Verdict Execution time Memory Grader output
1 Correct 5 ms 6400 KB Output is correct
2 Correct 5 ms 6400 KB Output is correct
3 Correct 5 ms 6400 KB Output is correct
4 Correct 5 ms 6400 KB Output is correct

Subtask #4
16.0 / 16.0

# Verdict Execution time Memory Grader output
1 Correct 5 ms 6528 KB Output is correct
2 Correct 4 ms 6400 KB Output is correct
3 Correct 5 ms 6400 KB Output is correct
4 Correct 5 ms 6400 KB Output is correct
5 Correct 5 ms 6528 KB Output is correct
6 Correct 5 ms 6528 KB Output is correct
7 Correct 5 ms 6400 KB Output is correct
8 Correct 5 ms 6400 KB Output is correct
9 Correct 5 ms 6400 KB Output is correct
10 Correct 5 ms 6400 KB Output is correct

Subtask #5
50.0 / 50.0

# Verdict Execution time Memory Grader output
1 Correct 5 ms 6400 KB Output is correct
2 Correct 4 ms 6400 KB Output is correct
3 Correct 5 ms 6528 KB Output is correct
4 Correct 5 ms 6400 KB Output is correct
5 Correct 5 ms 6400 KB Output is correct
6 Correct 5 ms 6400 KB Output is correct
7 Correct 5 ms 6400 KB Output is correct
8 Correct 5 ms 6400 KB Output is correct
9 Correct 5 ms 6400 KB Output is correct
10 Correct 5 ms 6400 KB Output is correct
11 Correct 4 ms 6400 KB Output is correct
12 Correct 5 ms 6528 KB Output is correct
13 Correct 5 ms 6400 KB Output is correct
14 Correct 5 ms 6400 KB Output is correct
15 Correct 4 ms 6400 KB Output is correct
16 Correct 4 ms 6400 KB Output is correct
17 Correct 4 ms 6400 KB Output is correct
18 Correct 4 ms 6400 KB Output is correct
19 Correct 5 ms 6400 KB Output is correct
20 Correct 6 ms 6528 KB Output is correct
21 Correct 5 ms 6400 KB Output is correct
22 Correct 5 ms 6400 KB Output is correct
23 Correct 5 ms 6400 KB Output is correct
24 Correct 5 ms 6400 KB Output is correct
25 Correct 5 ms 6528 KB Output is correct
26 Correct 4 ms 6400 KB Output is correct
27 Correct 5 ms 6400 KB Output is correct
28 Correct 5 ms 6400 KB Output is correct
29 Correct 5 ms 6528 KB Output is correct
30 Correct 5 ms 6528 KB Output is correct
31 Correct 5 ms 6400 KB Output is correct
32 Correct 5 ms 6400 KB Output is correct
33 Correct 5 ms 6400 KB Output is correct
34 Correct 5 ms 6400 KB Output is correct
35 Correct 14 ms 7424 KB Output is correct
36 Correct 6 ms 6528 KB Output is correct
37 Correct 18 ms 7680 KB Output is correct
38 Correct 14 ms 8320 KB Output is correct
39 Correct 108 ms 17608 KB Output is correct
40 Correct 132 ms 17528 KB Output is correct
41 Correct 60 ms 17528 KB Output is correct
42 Correct 104 ms 17528 KB Output is correct
43 Correct 128 ms 22000 KB Output is correct
44 Correct 50 ms 17528 KB Output is correct