Submission #802640

#	Time	Username	Problem	Language	Result	Execution time	Memory
802640		raul2008487	Awesome Arrowland Adventure (eJOI19_adventure)	C++17	34 / 100	1 ms	340 KiB

adventure

#include <bits/stdc++.h>
#define pb push_back
#define eb emplace_back
#define in insert
#define ld long double
#define ll long long
#define pii pair<ll,ll>
#define vl vector<ll>
#define mpr make_pair
#define F first
#define S second
#define lg(a) __lg(a)
#define all(v) v.begin(),v.end()
#define endl "\n"
#define LMX LLONG_MAX
using namespace std;
const int mod = 1e9+7;
const int sz = 505;
const ll oo = 1000000000000000005;
char a[sz][sz];
ll rot[27][27],vis[sz][sz];
ll ans=oo,f,n,m,cur,fl;
void rec(ll x, ll y){
    if(x==n && y==m){
            ans=min(ans,cur);
            f=1;
            if(ans==3){
                fl=1;
                return ;
            }
    }
    if(a[x][y]=='X'){return ;}
    vis[x][y]=1;
    if(x<n && (!vis[x+1][y])){
        ll cost = rot[a[x][y]-'A']['S'-'A'];
        //if(cost<0){cost+=4;}
        cur+=cost;
        rec(x+1,y);
        //if(fl){cout<<x<<" "<<y<<" "<<cost<<endl;return ;}
        cur-=cost;
    }
    if(x>1 && (!vis[x-1][y])){
        ll cost = rot[a[x][y]-'A']['N'-'A'];
        //if(cost<0){cost+=4;}
        cur+=cost;
        rec(x-1,y);
        //if(fl){cout<<x<<" "<<y<<" "<<cost<<endl;return ;}
        cur-=cost;
    }
    if(y<m && (!vis[x][y+1])){
        ll cost = rot[a[x][y]-'A']['E'-'A'];
        //if(cost<0){cost+=4;}
        cur+=cost;
        rec(x,y+1);
        //if(fl){cout<<x<<" "<<y<<" "<<cost<<endl;return ;}
        cur-=cost;
    }
    if(y>1 && (!vis[x][y-1])){
        ll cost = rot[a[x][y]-'A']['W'-'A'];
        //if(cost<0){cost+=4;}
        cur+=cost;
        rec(x,y-1);
        //if(fl){cout<<x<<" "<<y<<" "<<cost<<endl;return ;}
        cur-=cost;
    }

    vis[x][y]=0;
}
void solve(){
    ll i,j;
    cin>>n>>m;
    rot['S'-'A']['S'-'A']=0;
    rot['S'-'A']['W'-'A']=1;
    rot['S'-'A']['N'-'A']=2;
    rot['S'-'A']['E'-'A']=3;

    rot['W'-'A']['S'-'A']=3;
    rot['W'-'A']['W'-'A']=0;
    rot['W'-'A']['N'-'A']=1;
    rot['W'-'A']['E'-'A']=2;

    rot['N'-'A']['S'-'A']=2;
    rot['N'-'A']['W'-'A']=3;
    rot['N'-'A']['N'-'A']=0;
    rot['N'-'A']['E'-'A']=1;

    rot['E'-'A']['S'-'A']=1;
    rot['E'-'A']['W'-'A']=2;
    rot['E'-'A']['N'-'A']=3;
    rot['E'-'A']['E'-'A']=0;

    for(i=1;i<=n;i++){
        for(j=1;j<=m;j++){
            cin>>a[i][j];
        }
    }
    if(n==1){
        for(i=1;i<m;i++){
            if(a[1][i]=='N'){cur++;}
            else if(a[1][i]=='E'){continue;}
            else if(a[1][i]=='S'){cur+=3;}
            else if(a[1][i]=='W'){cur+=2;}
            else{cout<<-1<<endl;return ;}
        }
        cout<<cur<<endl;
        return  ;
    }
    else if(n==3 && m==3){
       f=0;cur=0;
       rec(1,1);
       if(f){
           cout << ans << endl;
       }
       else{
           cout << -1 << endl;
       }
    }
}
int main() {
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    ll t=1;
    //cin>>t;
    while(t--){
        solve();
    }

}

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