Given a 5x6 snakes and ladders board, find the minimum number of dice throws required to reach the destination or last cell (30^th cell) from the source (1st cell).

You are given an integer N denoting the total number of snakes and ladders and an array arr[] of 2*N size where 2*i and (2*i + 1)^th values denote the starting and ending point respectively of i^th snake or ladder. The board looks like the following.

Example 1:

Input:
N = 8
arr[] = {3, 22, 5, 8, 11, 26, 20, 29, 
       17, 4, 19, 7, 27, 1, 21, 9}
Output: 3
Explanation:
The given board is the board shown
in the figure. For the above board 
output will be 3. 
a) For 1st throw get a 2. 
b) For 2nd throw get a 6.
c) For 3rd throw get a 2.

Your Task:
You do not need to read input or print anything. Your task is to complete the function minThrow() which takes N and arr as input parameters and returns the minimum number of throws required to reach the end of the game.

Expected Time Complexity: O(N)
Expected Auxiliary Space: O(N)

Constraints:
1 ≤ N ≤ 10
1 ≤ arr[i] ≤ 30