Submission #1301729

#	Time	Username	Problem	Language	Result	Execution time	Memory
1301729		h1drogen	Awesome Arrowland Adventure (eJOI19_adventure)	C++20	100 / 100	76 ms	33912 KiB

adventure

#include<bits/stdc++.h>
using namespace std;
#define int long long
#define ll unsigned long long
#define all(x) (x).begin(),(x).end()
#define rall(x) (x).rbegin(),(x).rend()
#define f first
#define s second  
#define yes cout<<"YES\n"
#define no cout<<"NO\n"
#define imp cout<<-1<<"\n"
#define pb push_back
#define pii pair<int,int>
#define piii pair<int,pair<int,int>>
#define ls v<<1
#define rs v<<1|1
#define fast ios::sync_with_stdio(false);cin.tie(0);cout.tie(0)
#define ptree tree *
const int mod=1e9+7;
const int INF = 1e18;
const int sqr=317;
const int N=1e6;
int modi(int a,int b){
    return (a*b)%mod;
}
vector<vector<pii>>g;
void solve(){
    int n,m,k,a=1e18,b=0,c=0,d,e=0,f=0;
    cin>>n>>m;
    n++;
    m++;
    g.resize((n+2)*(m+2));
    for(int i=1;i<n;i++){
        for(int j=1;j<m;j++){
            char ch;
            cin>>ch;
            if(ch=='W'){
                g[i*m+j].pb({m*i+j-1,0});
                g[i*m+j].pb({m*(i-1)+j,1});
                g[i*m+j].pb({m*i+j+1,2});
                g[i*m+j].pb({m*(i+1)+j,3});
            }
            if(ch=='N'){
                g[i*m+j].pb({m*i+j-1,3});
                g[i*m+j].pb({m*(i-1)+j,0});
                g[i*m+j].pb({m*i+j+1,1});
                g[i*m+j].pb({m*(i+1)+j,2});
            }
            if(ch=='E'){
                g[i*m+j].pb({m*i+j-1,2});
                g[i*m+j].pb({m*(i-1)+j,3});
                g[i*m+j].pb({m*i+j+1,0});
                g[i*m+j].pb({m*(i+1)+j,1});
            }
            if(ch=='S'){
                g[i*m+j].pb({m*i+j-1,1});
                g[i*m+j].pb({m*(i-1)+j,2});
                g[i*m+j].pb({m*i+j+1,3});
                g[i*m+j].pb({m*(i+1)+j,0});
            }
        }
    }   
    int sz=(n+2)*(m+2);
    vector<int>dd((n+2)*(m+2),INF);
    vector<int>us((n+2)*(m+2),0);
    dd[m+1]=0;
    
    priority_queue<pii,vector<pii>,greater<pii>>q;
    q.push({0,m+1});
    while(!q.empty()){
        auto [w,v]=q.top();
        q.pop();
        if(w>dd[v]){
            continue;
        }
        for(auto k:g[v]){
            if(dd[k.f]>dd[v]+k.s){
                dd[k.f]=dd[v]+k.s;
                q.push({dd[k.f],k.f});
            }
        }
    }

    if(dd[(n-1)*m+m-1]==INF)
        cout<<-1<<"\n";
    else
        cout<<dd[(n-1)*m+m-1]<<"\n";
}
signed main(){
    fast;
    int t=1;
    // cin>>t;
    while(t--){
        solve();
    }
}

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