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
How to find the position of an element in a vector without using the find function
Return the first and last character of a string
Insert zeros into vector
Perfect Square or not
Sum of the Matrix Elements
Sum of first n terms of a harmonic progression
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