HDOJ1008

#include"iostream"#include"vector"using namespace std;int main(){//freopen("a.txt","r",stdin);int n,i;vector<int>a;while(cin>>n&&n){a.clear();int floor;for(i=0;i<n;i++){cin>>floor;a.push_back (floor);}int sum=a[0]*6;for(i=1;i<(int)(a.size());i++){if(a[i]>a[i-1])sum+=(a[i]-a[i-1])*6;else sum+=(a[i-1]-a[i])*4;}sum+=(int)a.size()*5;cout<<sum<<endl;}return 0;}