Submission #1133684

#	Time	Username	Problem	Language	Result	Execution time	Memory
1133684		steveonalex	Awesome Arrowland Adventure (eJOI19_adventure)	C++20	100 / 100	436 ms	2888 KiB

adventure

#include <bits/stdc++.h>

using namespace std;

typedef long long ll;
typedef unsigned long long ull;

#define MASK(i) (1LL << (i))
#define GETBIT(mask, i) (((mask) >> (i)) & 1)
#define ALL(v) (v).begin(), (v).end()

ll max(ll a, ll b){return (a > b) ? a : b;}
ll min(ll a, ll b){return (a < b) ? a : b;}

ll gcd(ll a, ll b){return __gcd(a, b);}
ll LASTBIT(ll mask){return (mask) & (-mask);}
int pop_cnt(ll mask){return __builtin_popcountll(mask);}
int ctz(ll mask){return __builtin_ctzll(mask);}
int logOf(ll mask){return __lg(mask);}

mt19937_64 rng(chrono::high_resolution_clock::now().time_since_epoch().count());
ll rngesus(ll l, ll r){return l + (ull) rng() % (r - l + 1);}

template <class T1, class T2>
    bool maximize(T1 &a, T2 b){
        if (a < b) {a = b; return true;}
        return false;
    }

template <class T1, class T2>
    bool minimize(T1 &a, T2 b){
        if (a > b) {a = b; return true;}
        return false;
    }

template <class T>
    void printArr(T& container, string separator = " ", string finish = "\n"){
        for(auto item: container) cout << item << separator;
        cout << finish;
    }


template <class T>
    void remove_dup(vector<T> &a){
        sort(ALL(a));
        a.resize(unique(ALL(a)) - a.begin());
    }

const int INF = 1e9 + 69;
int dx[] = {0, 1, 0, -1};
int dy[] = {1, 0, -1, 0};

int convert(char c){
    if (c == 'E') return 0;
    if (c == 'S') return 1;
    if (c == 'W') return 2;
    if (c == 'N') return 3;
    return 4;
}

char convert_back(int c){
    if (c == 0) return 'E';
    if (c == 1) return 'S';
    if (c == 2) return 'W';
    return 'N';
}

void solve(){
    int n, m; cin >> n >> m;
    vector<string> grid(n);
    for(int i = 0; i<n; ++i) cin >> grid[i];

    pair<int, int> s = {0, 0}, e = {n-1, m-1};

    int dis[n][m], trace[n][m]; memset(trace, 0, sizeof trace);
    for(int i = 0; i<n; ++i) for(int j = 0; j<m; ++j) dis[i][j] = INF;
    dis[s.first][s.second] = 0;
    deque<pair<int,int>> q; q.push_back(s);
    while(q.size()){
        pair<int, int> u = q.front(); q.pop_front();

        int current_cell = convert(grid[u.first][u.second]);
        if (current_cell == 4) continue;
        for(int _dir = 0; _dir < 4; ++_dir){
            int dir = (_dir + current_cell) % 4;
            pair<int, int> v = {u.first + dx[dir], u.second + dy[dir]};
            if (0 <= v.first && v.first < n && 0 <= v.second && v.second < m){
                int cur_cost = dis[u.first][u.second] + _dir;
                if (minimize(dis[v.first][v.second], cur_cost)){
                    if (current_cell == 5) q.push_front(v);
                    else q.push_back(v);
                    trace[v.first][v.second] = dir;
                }
            }
        }
    }
    if (dis[e.first][e.second] == INF) cout << -1 << "\n";
    else cout << dis[e.first][e.second] << "\n";
}

int main(void){
    ios::sync_with_stdio(0); cin.tie(0); cout.tie(0);

    clock_t start = clock();
    
    solve();

    cerr << "Time elapsed: " << clock() - start << "ms!\n";
    return 0;
}

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