Given the unsigned 8-bit integer x, return the number y which is the binary inversion of x.
For example if x is 5, y should be 250 because:
5 (8-bit): 00000101
250 (8-bit): 11111010
Return a list sorted by number of occurrences
Basic electricity in a dry situation
Determine Whether an array is empty
Replace values under a limit
sum of ASCII
Connect 4 (the boardgame)
Count the numbers
Remove multiples of N
Second smallest number
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