Problem 568. Number of 1s in a binary string

Created by Srivardhini

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Find the number of 1s in the given binary string. Example. If the input string is '1100101', the output is 4. If the input string is '0000', the output is 0

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Last Solution submitted on Jan 16, 2026

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Ryan McBurney on 30 Aug 2019

Something weird is happening

When I submit the size of my code is -1 and it fails the test suite when it seems to work fine in MATLAB desktop.

Fakhteh Ghalami on 9 Nov 2019

would you please let me know why
sum(x) creates error?

Devon Chen on 10 Nov 2021

Cool problem!

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Problem 568. Number of 1s in a binary string

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Problem 568. Number of 1s in a binary string

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