public static void main(String args[]){
        int input[] = {5,7,6,8,2,6,10,4};
        NBy2PairSumToK nb = new NBy2PairSumToK();
        System.out.println(nb.pair(input, 6));
    }
Write a program to determine whether n/2 distinctive pairs can be formed 
from given n integers where n is even and each pair's sum is divisible by given k. 
Numbers cannot be repeated in the pairs, that means only you can form total n/2 pairs.
src/com/interview/number/NBy2PairSumToK.java