Submission #1000169

#	Time	Username	Problem	Language	Result	Execution time	Memory
1000169		vjudge1	Awesome Arrowland Adventure (eJOI19_adventure)	C++17	100 / 100	91 ms	43704 KiB

adventure

#include <bits/stdc++.h>
using namespace std;
#define endl '\n'
#define ll long long
#define f first
#define s second
#define pll pair<ll, ll>
priority_queue<pair<ll, pll>, vector<pair<ll, pll>>, greater<pair<ll, pll>>>q;
const ll sz=505, mod=1e9+7;
map<char, ll>mp;
ll n, m, used[sz][sz], dis[sz][sz];
char k[sz][sz];
vector<pair<pair<ll, ll>, ll>>g[sz][sz];
ll cnt(char a, char b)
{
    ll dif=mp[a]-mp[b];
    if(dif<0) dif+=4;
    return dif;
}
int main()
{
    ios_base::sync_with_stdio(false);cin.tie(0);cout.tie(0);
    mp['E']=0;
    mp['N']=1;
    mp['W']=2;
    mp['S']=3;
    cin>>n>>m;
    for(int i=1; i<=n; i++){
        for(int j=1; j<=m; j++){
            cin>>k[i][j];
            if(k[i][j]=='X') continue;
            if(i>1){
                g[i][j].push_back({{i-1, j}, cnt(k[i][j], 'N')});
            }
            if(i<n){
                g[i][j].push_back({{i+1, j}, cnt(k[i][j], 'S')});
            }
            if(j>1){
                g[i][j].push_back({{i, j-1}, cnt(k[i][j], 'W')});
            }
            if(j<m){
                g[i][j].push_back({{i, j+1}, cnt(k[i][j], 'E')});
            }
        }
    }
    memset(dis, 32, sizeof(dis));
    q.push({0, {1, 1}});
    dis[1][1]=0;
    while(q.size()){
        ll x=q.top().s.first;
        ll y=q.top().s.second;
        q.pop();
        if(used[x][y]) continue;
        used[x][y]=1;
        for(auto j:g[x][y]){
            ll u=j.f.f, v=j.f.s, w=j.s;
            if(dis[u][v]>dis[x][y]+w){
                dis[u][v]=dis[x][y]+w;
                q.push({dis[u][v], {u, v}});
            }
        }
    }
    if(!used[n][m]) cout<<-1;
    else cout<<dis[n][m];
}

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