Submission #383257

#	Time	Username	Problem	Language	Result	Execution time	Memory
383257		MODDI	Awesome Arrowland Adventure (eJOI19_adventure)	C++14	0 / 100	2 ms	1132 KiB

adventure

#include <bits/stdc++.h>
#define ll long long
#define pii pair<int,int>
#define pll pair<ll,ll>
#define vi vector<int>
#define vl vector<ll>
#define mp make_pair
#define pb push_back
using namespace std;
int n, m;
char mat[501][501];
map<pii, int> id;
vector<pii> G[30000];
bool in_range(int i, int j){
	if(i >= 0 && i < n && j >= 0 && j < m)
		return true;
	return false;
}
void dijkstra(){
	bool vis[n * m + 1];
	int dist[n *m + 1];
	for(int i = 0; i < n * m + 1; i++)
	{
		vis[i] = false;
		dist[i] = 1e9;
	}
	priority_queue<pii> pq;
	pq.push(mp(0,0));
	dist[0] = 0;
	vis[0] = true;
	while(!pq.empty()){
		pii state = pq.top();
		pq.pop();
		for(auto next : G[state.second]){
			int next_city = next.first, len = next.second;
			if(dist[next_city] > dist[state.second] + len){
				dist[next_city] = dist[state.second] + len;
				pq.push(mp(-dist[next_city], next_city));
			}
		}
	}
	cout<<dist[id[mp(n-1,m-1)]]<<endl;
}
int main(){
	cin>>n>>m;
	int cnt = 0;
	for(int i = 0; i < n; i++){
		for(int j = 0; j < m; j++){
			cin>>mat[i][j];
			id[mp(i,j)] = cnt;
			cnt++;
		}
	}
	for(int i = 0; i < n; i++){
		for(int j = 0; j < m; j++){
			if(mat[i][j]=='X')
				continue;
			else if(mat[i][j]=='N'){
				if(in_range(i - 1, j)){
					G[id[mp(i,j)]].pb(mp(id[mp(i - 1, j)], 0));
					//cout<<id[mp(i,j)]<<" "<<id[mp(i - 1,j)]<<" "<<0<<endl;
				}
				if(in_range(i + 1, j)){
					G[id[mp(i,j)]].pb(mp(id[mp(i + 1, j)], 2));
					//cout<<id[mp(i,j)]<<" "<<id[mp(i + 1,j)]<<" "<<2<<endl;
				}
				if(in_range(i, j + 1))
				{
					G[id[mp(i,j)]].pb(mp(id[mp(i, j + 1)], 1));
					//cout<<id[mp(i,j)]<<" "<<id[mp(i,j + 1)]<<" "<<1<<endl;
				}
				if(in_range(i, j - 1)){
					G[id[mp(i,j)]].pb(mp(id[mp(i, j-1)], 3));
					//cout<<id[mp(i,j)]<<" "<<id[mp(i,j-1)]<<" "<<3<<endl;
				}
			}
			else if(mat[i][j]=='E'){
				if(in_range(i - 1, j)){
					G[id[mp(i,j)]].pb(mp(id[mp(i - 1, j)], 3));
					//cout<<id[mp(i,j)]<<" "<<id[mp(i - 1,j)]<<" "<<3<<endl;
				}
				if(in_range(i + 1, j)){
					G[id[mp(i,j)]].pb(mp(id[mp(i + 1, j)], 1));
					//cout<<id[mp(i,j)]<<" "<<id[mp(i + 1,j)]<<" "<<1<<endl;
				}
				if(in_range(i, j + 1))
				{
					G[id[mp(i,j)]].pb(mp(id[mp(i, j + 1)], 0));
					//cout<<id[mp(i,j)]<<" "<<id[mp(i,j + 1)]<<" "<<0<<endl;
				}
				if(in_range(i, j - 1)){
					G[id[mp(i,j)]].pb(mp(id[mp(i, j-1)], 2));
					//cout<<id[mp(i,j)]<<" "<<id[mp(i,j-1)]<<" "<<3<<endl;
				}
			}
			else if(mat[i][j]=='S'){
				if(in_range(i - 1, j)){
					G[id[mp(i,j)]].pb(mp(id[mp(i - 1, j)], 2));
					//cout<<id[mp(i,j)]<<" "<<id[mp(i - 1,j)]<<" "<<2<<endl;
				}
				if(in_range(i + 1, j)){
					G[id[mp(i,j)]].pb(mp(id[mp(i + 1, j)], 0));
					//cout<<id[mp(i,j)]<<" "<<id[mp(i + 1,j)]<<" "<<0<<endl;
				}
				if(in_range(i, j + 1))
				{
					G[id[mp(i,j)]].pb(mp(id[mp(i, j + 1)], 3));
				}
				if(in_range(i, j - 1)){
					G[id[mp(i,j)]].pb(mp(id[mp(i, j-1)], 1));
				}
			}
			else if(mat[i][j]=='W'){
				if(in_range(i - 1, j)){
					G[id[mp(i,j)]].pb(mp(id[mp(i - 1, j)], 1));
					//cout<<id[mp(i,j)]<<" "<<id[mp(i - 1,j)]<<" "<<1<<endl;
				}
				if(in_range(i + 1, j)){
					G[id[mp(i,j)]].pb(mp(id[mp(i + 1, j)], 3));
					//cout<<id[mp(i,j)]<<" "<<id[mp(i + 1,j)]<<" "<<3<<endl;
				}
				if(in_range(i, j + 1))
				{
					G[id[mp(i,j)]].pb(mp(id[mp(i, j + 1)], 2));
				}
				if(in_range(i, j - 1)){
					G[id[mp(i,j)]].pb(mp(id[mp(i, j-1)], 0));
				}
			}
			else
			{
				assert(false);
			}
		}
	}
	dijkstra();
}

Compilation message (stderr)

adventure.cpp: In function 'void dijkstra()':
adventure.cpp:20:7: warning: variable 'vis' set but not used [-Wunused-but-set-variable]
   20 |  bool vis[n * m + 1];
      |       ^~~

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