Submission #750418

#	Time	Username	Problem	Language	Result	Execution time	Memory
750418		Muaath_5	Awesome Arrowland Adventure (eJOI19_adventure)	C++17	34 / 100	1 ms	468 KiB

adventure

#include <bits/stdc++.h>
#define pii pair<int, int>
#define ll long long
#define umin(x, y) x = min(x, y)
#define sq(x) ((x)*(x))
using namespace std;

const int N = 509;
const ll INF = 2e9 + 7;

int n, m;
char g[N][N], gg[N][N];

int clc(char f, char t) {
	if (f == t) return 0;
	if (f == 'W') {
		if (t == 'N') return 1;
		if (t == 'E') return 2;
		if (t == 'S') return 3;
	}
	if (f == 'S') {
		if (t == 'W') return 1;
		if (t == 'N') return 2;
		if (t == 'E') return 3;
	}
	if (f == 'E') {
		if (t == 'S') return 1;
		if (t == 'W') return 2;
		if (t == 'N') return 3;
	}
	if (t == 'E') return 1;
	if (t == 'S') return 2;
	if (t == 'W') return 3;
}

bool vis[N][N];
int dist[N][N];

int main()
{
	ios::sync_with_stdio(0), cin.tie(0), cout.tie(0);
	cin >> n >> m;
	for (int i = 0; i <= n+1; i++) {
		g[0][i] = 'X';
		g[i][m+1] = 'X';
	}
	for (int i = 0; i <= m + 1; i++) {
		g[i][0] = 'X';
		g[n+1][i] = 'X';
	}
	for (int i = 1; i <= n; i++) {
		for (int j = 1; j <= m; j++) {
			cin >> g[i][j];
			dist[i][j] = INF;
		}
	}
	priority_queue<pair<int, pii>, vector<pair<int, pii>>, greater<pair<int, pii>>> pq;
	dist[1][1] = 0;
	pq.push({ 0, {1, 1} });
	while (pq.size())
	{
		auto [cost, pnt] = pq.top();
		auto [x, y] = pnt;
		pq.pop();
		if (vis[x][y] || g[x][y] == 'X') continue;
		vis[x][y] = 1;

		if (dist[x - 1][y] > cost + clc(g[x][y], 'N')) {
			dist[x - 1][y] = cost + clc(g[x][y], 'N');
			pq.push({ dist[x + 1][y], {x-1, y} });
		}

		if (dist[x + 1][y] > cost + clc(g[x][y], 'S')) {
			dist[x + 1][y] = cost + clc(g[x][y], 'S');
			pq.push({ dist[x + 1][y], {x+1, y} });
		}

		if (dist[x][y + 1] > cost + clc(g[x][y], 'E')) {
			dist[x][y + 1] = cost + clc(g[x][y], 'E');
			pq.push({ dist[x][y + 1], {x, y+1} });
		}

		if (dist[x][y - 1] > cost + clc(g[x][y], 'W')) {
			dist[x][y - 1] = cost + clc(g[x][y], 'W');
			pq.push({ dist[x][y - 1], {x, y-1} });
		}

	}
	cout << (dist[n][m] == INF ? -1 : dist[n][m]);
}

Compilation message (stderr)

adventure.cpp: In function 'int clc(char, char)':
adventure.cpp:34:1: warning: control reaches end of non-void function [-Wreturn-type]
   34 | }
      | ^

• Subtask 1: 10 / 10
• Subtask 2: 12 / 12
• Subtask 3: 12 / 12
• Subtask 4: 0 / 16
• Subtask 5: 0 / 50