Submission #448049

#	Time	Username	Problem	Language	Result	Execution time	Memory
448049		bigo	Awesome Arrowland Adventure (eJOI19_adventure)	C++14	34 / 100	1 ms	332 KiB

adventure

#include <bits/stdc++.h>
#include <cmath>
using namespace std;
typedef unsigned long long ll;
const int sz = 5e5;
const ll INF = 1e18;
ll n, m;
#define pii pair<ll,ll>
vector<vector<pii>>gra;
vector<ll> dist;
bitset<sz>done;
void solve(int su) {
	for (int i = 0; i < n*m; i++) {
		dist[i] = INF;
	}
	dist[su] = 0;
	priority_queue<pii, vector<pii>, greater<pii>>pq;
	pq.push({ 0,su });
	while (!pq.empty()) {
		pii tmp = pq.top();
		pq.pop();
		ll u = tmp.second, d = tmp.first;
		if (done[u])
			continue;
		done[u] = true;
		for (auto ii : gra[tmp.second]) {
			ll v = ii.first, w = ii.second;
			if (dist[v] > dist[u] + w) {
				dist[v] = dist[u] + w;
				pq.push({ dist[v],v });
			}
		}
	}
}
int main() {
	cin >> n >> m;
	vector<vector<char>>vec1(n, vector<char>(m));
	for (int i = 0; i < n; i++) {
		for (int j = 0; j < m; j++) {
			cin >> vec1[i][j];
		}
	}
	vector<vector<int>>vec(n, vector<int>(m));
	for (int i = 0; i < n; i++) {
		for (int j = 0; j < m; j++) {
			if (vec1[i][j] == 'N')
				vec[i][j] = 1;
			if (vec1[i][j] == 'E')
				vec[i][j] = 2;
			if (vec1[i][j] == 'S')
				vec[i][j] = 3;
			if (vec1[i][j] == 'W')
				vec[i][j] = 4;
		}
	}
	int tmp = 0;
	dist.resize(n * m);
	gra.resize(n * m);
	for (int i = 0; i < n; i++) {
		for (int j = 0; j < m; j++) {
			if (vec1[i][j] != 'X') {
				if (i != 0) {
					gra[tmp].push_back({ tmp - m,abs(vec[i][j] - 1) });
				}
				if (i != n - 1) {
					if (vec[i][j] > 3)
						gra[tmp].push_back({ tmp + m,4 - abs(vec[i][j] - 3) });
					else
						gra[tmp].push_back({ tmp + m,abs(vec[i][j] - 3) });
				}
				if (j != m - 1) {
					if (vec[i][j] > 2)
						gra[tmp].push_back({ tmp + 1,4 - abs(vec[i][j] - 2) });
					else
						gra[tmp].push_back({ tmp + 1,abs(vec[i][j] - 2) });
				}
				if (j != 0) {
					gra[tmp].push_back({ tmp - 1 ,abs(vec[i][j] - 4) });
				}
			}
			tmp++;
		}
	}
	solve(0);
	if (dist[n * m - 1] == INF)
		cout << -1;
	else
		cout << dist[n * m - 1];
}

Compilation message (stderr)

adventure.cpp: In function 'void solve(int)':
adventure.cpp:13:20: warning: comparison of integer expressions of different signedness: 'int' and 'll' {aka 'long long unsigned int'} [-Wsign-compare]
   13 |  for (int i = 0; i < n*m; i++) {
      |                  ~~^~~~~
adventure.cpp:22:22: warning: unused variable 'd' [-Wunused-variable]
   22 |   ll u = tmp.second, d = tmp.first;
      |                      ^
adventure.cpp: In function 'int main()':
adventure.cpp:38:20: warning: comparison of integer expressions of different signedness: 'int' and 'll' {aka 'long long unsigned int'} [-Wsign-compare]
   38 |  for (int i = 0; i < n; i++) {
      |                  ~~^~~
adventure.cpp:39:21: warning: comparison of integer expressions of different signedness: 'int' and 'll' {aka 'long long unsigned int'} [-Wsign-compare]
   39 |   for (int j = 0; j < m; j++) {
      |                   ~~^~~
adventure.cpp:44:20: warning: comparison of integer expressions of different signedness: 'int' and 'll' {aka 'long long unsigned int'} [-Wsign-compare]
   44 |  for (int i = 0; i < n; i++) {
      |                  ~~^~~
adventure.cpp:45:21: warning: comparison of integer expressions of different signedness: 'int' and 'll' {aka 'long long unsigned int'} [-Wsign-compare]
   45 |   for (int j = 0; j < m; j++) {
      |                   ~~^~~
adventure.cpp:59:20: warning: comparison of integer expressions of different signedness: 'int' and 'll' {aka 'long long unsigned int'} [-Wsign-compare]
   59 |  for (int i = 0; i < n; i++) {
      |                  ~~^~~
adventure.cpp:60:21: warning: comparison of integer expressions of different signedness: 'int' and 'll' {aka 'long long unsigned int'} [-Wsign-compare]
   60 |   for (int j = 0; j < m; j++) {
      |                   ~~^~~
adventure.cpp:65:11: warning: comparison of integer expressions of different signedness: 'int' and 'll' {aka 'long long unsigned int'} [-Wsign-compare]
   65 |     if (i != n - 1) {
      |         ~~^~~~~~~~
adventure.cpp:71:11: warning: comparison of integer expressions of different signedness: 'int' and 'll' {aka 'long long unsigned int'} [-Wsign-compare]
   71 |     if (j != m - 1) {
      |         ~~^~~~~~~~

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