cross 1: A + B =2 mins
return 1 (A stay): B = 2 mins
cross 2: C+D = 10 mins
return2 : A =1 min
cross 3: A + B = 2 mins
total = 17 mins
cross 1: A + B =2 mins
return 1 (A stay): B = 2 mins
cross 2: C+D = 10 mins
return2 : A =1 min
cross 3: A + B = 2 mins
total = 17 mins
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