7. Make a new version of your C++ program that creates instead a 2D array of 5x5 values of type boolean.  

1. Suppose indices represent people and that the value at row i, column j of a 2D array is true just in case i and j are friends and false otherwise. Use initializer list to instantiates and initialize your array to represent the following configuration: 
    

2. Write some code to count how many pairs of friends are represented in the array. Note that each friendship pair appears twice in the array, so in the example above there are 6 pairs of friends). 

3. Write a method to check whether two people have a common friend. For example, in the example above, 0 and 4 are both friends with 3 (so they have a common friend), whereas 1 and 2 have no common friends. The method should have three parameters: a 2D array of Boolean representing the friendship relationships and two integers i, j. The method should return true if there is an integer k such that i is a friend of k and k is a friend of j and return false otherwise. Make this method static and test it from the main() method. 

#10 1 2 3 4 (* means "friends") 2 1 3 I 4