Given an array of N integers. Write a program to check whether an arithmetic progression can be formed using all the given elements. If possible print “YES”, else print “NO”.
First line of input contains a single integer T which denotes the number of test cases. Then T test cases follows. First line of each test case contains a single integer N which denotes number of elements in the array. Second line of each test case contains N space separated integers which denotes elements of the array.
For each test case, print "YES" without quotes if an arithmetic progression can be formed using all the given elements, else print "NO" without quotes.
0 12 4 8
12 40 11 20
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