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
Check if sorted
Check to see if a Sudoku Puzzle is Solved
Test if a Number is a Palindrome without using any String Operations
CONVERT TAN TO SIN
Sum of first n terms of a harmonic progression
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