Submission #1082873

#	Time	Username	Problem	Language	Result	Execution time	Memory
1082873		timoni	Awesome Arrowland Adventure (eJOI19_adventure)	C++17	22 / 100	67 ms	102400 KiB

adventure

//don't copy pls)
/*TAAK ZDES NADO RECURSIU PISAT*/

//I'm not in the danger i am the DANGER
#include "bits/stdc++.h"
#include <ext/pb_ds/assoc_container.hpp>
#define ll long long
#define pb push_back
#define int long long
#define F first
#define S second
#define all(x) (x).begin(), (x).end()
#define pii pair<int,int>
#define sigma signed
using namespace std;
using namespace __gnu_pbds;
const int N = 3e5 + 5;
int mod = 1e9 + 7;
const int INF = 1e18;
int n,m,a[501][501],nei[5],dp[501][501],used[501][501];
vector <pii> g[501][501];
int hm(char c , char y){
	if(c == 'X' || y == 'X' || (c == y)){
		return 0;
	}
	if(c == 'N'){
		if(y == 'E'){
			return 1;
		}
		if(y == 'S'){
			return 2;
		}
		return 3;
	}
	if(c == 'W'){
		if(y == 'N'){
			return 1;
		}
		if(y == 'E'){
			return 2;
		}
		return 3;
	}
	if(c == 'S'){
		if(y == 'w'){
			return 1;
		}
		if(y == 'N'){
			return 2;
		}
		return 3;
	}
	if(c == 'E'){
		if(y == 'S'){
			return 1;
		}
		if(y == 'W'){
			return 2;
		}
		return 3;
	}
	return 0;
}
char c[501][501];
void dfs(int x , int y){
	used[x][y] = 1;
	for(auto to : g[x][y]){
		int v , u;
		v = to.F , u = to.S;
		dp[x - 1][y] = min(dp[x - 1][y] , dp[x][y] + hm(c[x][y] , 'N'));
		dp[x][y - 1] = min(dp[x][y - 1] , dp[x][y] + hm(c[x][y] , 'W'));
		dp[x + 1][y] = min(dp[x + 1][y] , dp[x][y] + hm(c[x][y] , 'S'));
		dp[x][y + 1] = min(dp[x][y + 1] , dp[x][y] + hm(c[x][y] , 'E'));
		dfs(v , u);
	}
}
void Gold(){
	cin >> n >> m;
	for(int i = 1 ; i <= n ; i++){
		for(int j = 1 ; j <= m ; j++){
			cin >> c[i][j];
		}
	}
	if(c[n][m] != 'X'){
		cout << "-1";
		return;
	}
	if(n == 1){
		int cnt = 0;
		for(int i = 1 ; i < m ; i++){
			if(c[1][i] == 'X'){
				cout << "-1";
				return;
			}
			char cc = 'E';
			cnt += hm(c[1][i] , cc);
			// cout << cnt << ' ';
		}
		cout << cnt;
		return;
	}
	if(m == 1){
		int cnt = 0;
		for(int i = 1 ; i < n ; i++){
			if(c[i][1] == 'X'){
				cout << "-1";
				return;
			}
			char cc = 'S';
			cnt += hm(c[i][1] , cc);
			// cout << cnt << ' ';
		}
		cout << cnt;
		return;
	}
	for(int i = 1 ; i <= n ; i++){
		for(int j = 1 ; j <= m ; j++){
			dp[i][j] = INF;
		}
	}
	for(int i = 1 ; i <= n ; i++){
		for(int j = 1 ; j <= m ; j++){
			if(c[i][j] == 'N' && i != 1){
				g[i][j].pb({i - 1 , j});
			}
			if(c[i][j] == 'W' && j != 1){
				g[i][j].pb({i , j - 1});
			}
			if(c[i][j] == 'S' && i != n){
				g[i][j].pb({i + 1 , j});
			}
			if(c[i][j] == 'E' && j != m){
				g[i][j].pb({i , j + 1});
			}
		}
	}
	dp[1][1] = 0;
	for(int i = 1 ; i <= n ; i++){
		for(int j = 1 ; j <= m ; j++){
			if(dp[i][j] != INF && !used[i][j]){
				dfs(i , j);
			}
		}
	}
	if(dp[n][m] == INF){
		cout << "-1";
	}
	else{
		cout << dp[n][m];
	}
}
sigma main(){
	//freopen("txt.in","r",stdin);
	//freopen("txt.out","w",stdout);
	ios_base::sync_with_stdio(0);
	cin.tie(0);
	srand(time(0));
	int TT = 1;
	// cin >> TT;
	for(int i = 1 ; i <= TT ; i++){
		//cout << "Case " << i << ": ";
		Gold();
	}
}

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