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
What is the next step in Conway's Life?
Back to basics 9 - Indexed References
Wrapping the Tower of Pisa
Output any real number that is neither positive nor negative
Sum of first n terms of a harmonic progression
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