Details of the problem ...
Input is crossing time list. (for example x= [1 2 5 8])
Output is the minimum time. (for original problem y_correct= 15)
Assumption 1: for this problem only four people will cross the bridge
Assumption 2: crossing times are integer
the fly, the train, the second train, and their Zeno's paradox
Number of Circles in a Number
Specific Element Count
Back to basics 21 - Matrix replicating
Homemade: Control Charts
Mean = Standard Deviation
Go back n times
'5*3' copy character 3 - five times
Produce the following matrix
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