Min Sequence

Problem description. You are given a a Number N.Now u need to find a sequence of integers(may be repeated) with smallest length such that for all i , ∑ 2^i gives the number N.Here i is an integer in the sequence. For eg - If N=2 , then the possible sequences are - {0,0} as 2^0 + 2^0=2 - {1} as 2^1=2 Now let's make this problem easier , simply output the length of the smallest sequence. Inp