Submission #999722

#	Time	Username	Problem	Language	Result	Execution time	Memory
999722		HasanV11010238	Awesome Arrowland Adventure (eJOI19_adventure)	C++17	100 / 100	219 ms	17396 KiB

adventure

#include <bits/stdc++.h>
using namespace std;
#define INF 1000000000
map<char, vector<vector<int>>> dir;
int n, m;
bool check(int x, int y){
    if (x >= 0 && x < n && y >= 0 && y < m){
        return true;
    }
    return false;
}
void init(){
    dir['N'] = {{0, -1, 0},{1, 0, 1}, {0, 1, 2}, {-1, 0, 3}};
    dir['E'] = {{0, -1, 3},{1, 0, 0}, {0, 1, 1}, {-1, 0, 2}};
    dir['S'] = {{0, -1, 2},{1, 0, 3}, {0, 1, 0}, {-1, 0, 1}};
    dir['W'] = {{0, -1, 1},{1, 0, 2}, {0, 1, 3}, {-1, 0, 0}};
    dir['X'] = {};
}
int bfs(vector<vector<char>> ma, vector<vector<int>> costs){
    priority_queue<vector<int>, vector<vector<int>>, greater<vector<int>>> q;
    q.push({0, 0, 0});
    costs[0][0] = 0;
    vector<vector<int>> us(m, vector<int>(n, 0));
    while(!q.empty()){
        vector<int> u = q.top();
        q.pop();
        vector<vector<int>> moves = dir[ma[u[2]][u[1]]];
        for (auto el : moves){
            int x = el[0] + u[1], y = el[1] + u[2];
            if (check(x, y) && costs[y][x] > costs[u[2]][u[1]] + el[2]){
                costs[y][x] = costs[u[2]][u[1]] + el[2];
                if (us[y][x] == 0){
                    q.push({costs[y][x], x, y});
                }
                us[y][x];
            }
        }
    }
    return costs[m - 1][n - 1];
}
int main(){
    cin>>m>>n;
    vector<vector<char>> ma;
    vector<vector<int>> costs;
    char r;
    for (int i = 0; i < m; i++){
        ma.push_back({});
        costs.push_back({});
        for (int j = 0; j < n; j++){
            cin>>r;
            ma[i].push_back(r);
            costs[i].push_back(INF);
        }
    }
    init();
    int res = bfs(ma, costs);
    if (res == INF){
        cout<<-1;
    }
    else{
        cout<<res;
    }
}

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