This dog() may be drowsy or function immediately when you call, return 1 or 0 accordingly within 2/10 second.
Find Rotated Substring
Is A the inverse of B?
Rotate a Matrix
Sophie Germain prime
Square Digits Number Chain Terminal Value (Inspired by Project Euler Problem 92)
How to subtract?
wait for me
Given an unsigned integer x, find the largest y by rearranging the bits in x
Tell me the slope
Predicting life and death of a memory-less light bulb
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