Submission #976057

#	Time	Username	Problem	Language	Result	Execution time	Memory
976057		vjudge1	Awesome Arrowland Adventure (eJOI19_adventure)	C++17	100 / 100	84 ms	12092 KiB

adventure

#include <bits/stdc++.h>
#define nah_id_win ios_base::sync_with_stdio(0); cin.tie(0)
#define ull unsigned long long
#define int long long
#define pb push_back
#define pob pop_back
#define pf push_front
#define pof pop_front
#define fi first
#define se second
#define pii pair<int,int>
#define all(x) (x).begin(), (x).end()
#define skibidi pair<int, pii>
using namespace std;
const int MOD = 1e9 + 7;

int dirx[4] = {0, -1, 0, 1};
int diry[4] = {-1, 0, 1, 0};
int dir[4] = {'W', 'N', 'E', 'S'};
map <char,int> mp = {
    {'W', 0},
    {'N', 1},
    {'E', 2},
    {'S', 3},
};

void with_this_treasure_i_summon(string name){
	freopen((name + ".in").c_str(), "r", stdin); 
	freopen((name + ".out").c_str(), "w", stdout);
}

signed main(){
	nah_id_win;
	int n, m; cin >> n >> m;
	vector<vector<char>> grid(n, vector<char>(m));
	vector<vector<int>> dist(n, vector<int>(m, 1e9));
	vector<vector<int>> vis(n, vector<int>(m));
	for (int i = 0; i < n; i++){
		for (int j = 0; j < m; j++){
			cin >> grid[i][j];
		}
	}
	
	priority_queue<skibidi, vector<skibidi>, greater<skibidi>> pq;
	dist[0][0] = 0;
	pq.push({dist[0][0], {0, 0}});
	
	while (!pq.empty()){
		int d = pq.top().fi;
		int ui = pq.top().se.fi;
		int uj = pq.top().se.se;
		pq.pop();

		if (!vis[ui][uj]){
        	vis[ui][uj] = 1;
        	if (grid[ui][uj] == 'X') continue;
    
            for (int i = 0; i < 4; i++){
				int vi = ui + dirx[i];
				int vj = uj + diry[i];
				
				if (vi >= 0 && vi < n && vj >= 0 && vj < m){
					int oriDir = mp[grid[ui][uj]];
					int curDir = mp[dir[i]];
					int cost = ((oriDir <= curDir)? 
					curDir - oriDir : curDir+4 - oriDir);
					
					if (dist[ui][uj] + cost < dist[vi][vj]){
	                    dist[vi][vj] = dist[ui][uj] + cost;
	                    pq.push({dist[vi][vj], {vi, vj}});
	                }
				}
			}
			
			// for (int i = 0; i < n; i++){
				// for (int j = 0; j < m; j++){
					// cout << dist[i][j] << " ";
				// }
				// cout << "\n";
			// }
			// cout << "\n";
        }
	}
	
	// for (int i = 0; i < n; i++){
		// for (int j = 0; j < m; j++){
			// cout << dist[i][j] << " ";
		// }
		// cout << "\n";
	// }
	
	cout << ((dist[n-1][m-1] == 1e9)? -1 : dist[n-1][m-1]) << "\n";
}

Compilation message (stderr)

adventure.cpp: In function 'int main()':
adventure.cpp:49:7: warning: unused variable 'd' [-Wunused-variable]
   49 |   int d = pq.top().fi;
      |       ^
adventure.cpp: In function 'void with_this_treasure_i_summon(std::string)':
adventure.cpp:28:9: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   28 |  freopen((name + ".in").c_str(), "r", stdin);
      |  ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
adventure.cpp:29:9: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   29 |  freopen((name + ".out").c_str(), "w", stdout);
      |  ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

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