Submission #975987

#	Time	Username	Problem	Language	Result	Execution time	Memory
975987		vjudge1	Awesome Arrowland Adventure (eJOI19_adventure)	C++17	100 / 100	51 ms	11972 KiB

adventure

#include <bits/stdc++.h>
#define int long long
#define f first
#define s second
#define pb push_back
#define endl '\n'
using namespace std;

int N,M,a[505][505];
int cost[505][505];
pair<int, int> dir[4];
map<char, int> ma;
char c;
priority_queue<pair<int, pair<int, int>>, vector<pair<int, pair<int, int>>>, greater<pair<int, pair<int, int>>>> p;

void solve() {
	cin >> N >> M;
	ma['N'] = 0;
	ma['E'] = 1;
	ma['S'] = 2;
	ma['W'] = 3;
	ma['X'] = -1;
	dir[0] = {-1, 0};
	dir[1] = {0, 1};
	dir[2] = {1, 0};
	dir[3] = {0, -1};
	for (int i = 1; i <= N; i++) {
		for (int j = 1; j <= M; j++) {
			cin >> c;
			a[i][j] = ma[c];
			cost[i][j] = 1e9;
		}
	}
	cost[1][1] = 0;
	p.push({0, {1, 1}});
	while (!p.empty()) {
		int cur = p.top().f;
		int icur = p.top().s.f;
		int jcur = p.top().s.s;
		// cout << cur << ' ' << icur << ' ' << jcur << endl;
		p.pop();
		if (icur == N && jcur == M) {
			cout << cur << endl;
			return;
		}
		if (a[icur][jcur] == -1) continue;
		if (cur > cost[icur][jcur]) continue;
		for (int cst = 0; cst < 4; cst++) {
			auto dr = dir[(a[icur][jcur] + cst) % 4];
			int inxt = icur + dr.f;
			int jnxt = jcur + dr.s;
			int cnxt = cur + cst;
			if (inxt >= 1 && inxt <= N && jnxt >= 1 && jnxt <= M && cost[inxt][jnxt] > cnxt) {
				cost[inxt][jnxt] = cnxt;
				p.push({cnxt, {inxt, jnxt}});
			}
		}
	}
	cout << -1 << endl;
}

int32_t main() {
	ios_base::sync_with_stdio(0); cin.tie(0);
	int tttt = 1;
	// cin >> tttt;
	while (tttt--) solve();
}

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