Given n as input, generate a n-by-n matrix 'O' using 0 and 1 .
[1 1 1 1
1 0 0 1
1 0 0 1
1 1 1 1]
three solution, all great.
Find the peak 3n+1 sequence value
Right and wrong
Angle between two vectors
Divisible by 4
Tick. Tock. Tick. Tock. Tick. Tock. Tick. Tock. Tick. Tock.
Calculate mean value of any pair in a vector.
Draw a 'Z'.
Numbers on 7-segment
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