Day 28 of 31-Day May LeetCode Challenge

Aanchal Patial
1 min readMay 28, 2020

Given a non-negative integer number num. For every number i in the range 0 ≤ i ≤ num calculate the number of 1’s in their binary representation and return them as an array

Follow up:

  • It is very easy to come up with a solution with run time O(n*sizeof(integer)). But can you do it in linear time O(n) /possibly in a single pass?
  • Space complexity should be O(n).
  • Can you do it like a boss? Do it without using any builtin function like __builtin_popcount in c++ or in any other language.

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Aanchal Patial

We never really grow up, we only learn how to act in public