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.*;
  public class Main
  {
  	public static void main(String[] args) {
  		Scanner s = new Scanner(System.in);
  		int t = s.nextInt();
  //		s.nextLine();
  		for(int i = 0; i<t;i++)
  		{
  		    int n = s.nextInt();
  		    int count1 = 0, count0 = 0;
  		    int growth= 1;
  		    int[] arr = new int[n];
  		    for(int j = 0; j<n;j++)
  		    {
  		        arr[j] = s.nextInt();
  		    }
  		    for(int j = 0; j<n;j++)
  		    {
  		        if(arr[j]==0)
  		        {
  		            count1=0;
  		            count0++;
  		        }
  		        if(arr[j]==1)
  		        {
  		            count1++;
  		            count0=0;
  		        }
  		        if(count0 == 2)
  		        {
  		            growth =-1;
  		            break;
  		        }
  		        if(count1 == 1)
  		        {
  		            growth += 1;
  		        }
  		        if(count1 > 1)
  		        {
  		            growth += 5;
  		        }
  		    }
  		    System.out.println(growth);
  		}
  	}
  }