I just saw that many submissions were based on simply going through each mine and distributing the gold in that mine according to the ratio between A and B.
I want to know how is this optimal. I didn’t get the slightest intuition on this approach. I thought for 2 hours but could not understand this thing.
If somebody can explain how this is working and the intuition behind it, it would really help me.
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Wait for editorial and btw for the same problem already a thread a created don’t create other one 
Ohh great. Thanks for telling me that. I am deleting this thread then.