1. some function was there had to find error .
2. given an array and integer m , had to find average of m groups in O(n) .
Ex : A[]={1,2,3,4,5} ,m=3
ans : avg(1,2,3) , avg(2,3,4),avg(3,4,5)
3.givean an array and target , had to find all pairs whose sum is equal to target.