Problem 138. Number of 1s in the Binary Representation of a Number

Created by @bmtran (Bryant Tran)

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Description

Return the number of 1s in the (unsigned integer) binary representation of a number. This function should be able to provide vectorized input and return an output with the same dimensions as the input.

Example

   in = 215
   out = 6

Solve

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1816 Solutions
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Last Solution submitted on Oct 27, 2025

Last 200 Solutions

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2 Comments

Kye Taylor on 12 Apr 2012

Can you clarify what you mean by "vectorized input"?

Pritesh Shah on 19 Aug 2014

Nice Test cases

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Problem 138. Number of 1s in the Binary Representation of a Number

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Last 200 Solutions

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Problem 138. Number of 1s in the Binary Representation of a Number

Solution Stats

Last 200 Solutions

Problem Comments

Solution Comments

Problem Recent Solvers466

Suggested Problems

More from this Author56

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