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
Test for balanced parentheses
cos for boss?
Bridge and Torch Problem - Length of Unique Time List
Bridge and Torch Problem - Probability
Modular multiplicative inverse
String permutations on phone keyboard
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