Weighing plan of bags
This script calculates the number of coins to weigh to find two bags of fake coins.
Two heavier bags : sum, one heavier and one lighter : dif, unknown : sum+dif
If
at most
two fake bags : val.
"-1" looks in decreasing order. List of values to force the beginning of sequence.
sum
dif
val
a[0]
length
-1
values :