【PAT】1008. Elevator

#define LOCAL#include <iostream>#include <cstdio>#include <cstring>#include <algorithm>#include <string>using namespace std;int main(){    #ifdef LOCAL        freopen("data.in","r",stdin);        freopen("data.out","w",stdout);    #endif // LOCAL    int n;    cin>>n;    int ans;    ans=n*5;    int first=0;    for(int i=0;i<n;i++){        int pos;        cin>>pos;        if(pos>first){            ans+=(pos-first)*6;            first=pos;        }else{            ans+=(first-pos)*4;            first=pos;        }    }    cout<<ans;    return 0;}