description: Petya has got an interesting flower. Petya is a busy person, so he sometimes forgets to water it. You are given n days from Petya's live and you have to determine what happened with his flower in the end.
  
  The flower grows as follows: 
  
    * If the flower isn't watered for two days in a row, it dies. 
    * If the flower is watered in the i-th day, it grows by 1 centimeter. 
    * If the flower is watered in the i-th and in the (i-1)-th day (i > 1), then it grows by 5 centimeters instead of 1. 
    * If the flower is not watered in the i-th day, it does not grow. 
  
  
  
  At the beginning of the 1-st day the flower is 1 centimeter tall. What is its height after n days?
  
  Input
  
  Each test contains multiple test cases. The first line contains the number of test cases t (1 ≤ t ≤ 100). Description of the test cases follows.
  
  The first line of each test case contains the only integer n (1 ≤ n ≤ 100).
  
  The second line of each test case contains n integers a_1, a_2, ..., a_n (a_i = 0 or a_i = 1). If a_i = 1, the flower is watered in the i-th day, otherwise it is not watered.
  
  Output
  
  For each test case print a single integer k — the flower's height after n days, or -1, if the flower dies.
  
  Example
  
  Input
  
  
  4
  3
  1 0 1
  3
  0 1 1
  4
  1 0 0 1
  1
  0
  
  
  Output
  
  
  3
  7
  -1
  1
solution: import java.util.Scanner;
  import java.util.Arrays;
  import java.util.Collections;
  
  public class Main{
  
      public static void main(String args[]){
          Scanner sc= new Scanner(System.in);
          
          short t=sc.nextShort();
          while(t>0){
              int height=1;
              int n=sc.nextInt();
              int temp=3,temp2=3;
              boolean flag=true;
              int [] arr= new int [n];
              for(int i=0;i<n;i++){
                  arr[i]=sc.nextInt();
              }
              for(int i=0;i<n;i++){
                  temp2=temp;
                  temp=arr[i];
                  if(i==0&&temp==1){
                      height+=1;
                  }
                  else if(temp==0&&temp2==0){
                      flag=false;
                      break;
                  }
                  else if(temp==1&&temp2==1){
                      height+=5;
                  }
                  else if(temp==1&&temp2==0){
                      height+=1;
                  }
                  
                  
              }
              if(flag) System.out.println(height);
              else System.out.println("-1");
              t--;
          }
          
              
              
      }
  }
  