# LeetCode 0338 - Counting Bits

## Contents

# Counting Bits

## Desicription

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

**Example 1:**

1 | Input: 2 |

**Example 2:**

1 | Input: 5 |

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.

## Solution

1 | class Solution { |