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You are storing visited co-ordinates in the set. You should store the segments instead. Run your code for this TestCase
1
NWSE
Correct ans is 20,while your code gives 16.
Can you elaborate a little further? I think I am not able to understand the question
Move (a, b) -> (c, d) costs 1 if and only if you've made (a, b) <-> (c, d) move before and 5 otherwise
You dont need to store the positions. You need the paths. Do it using a pair of pairs <x,y> to <a,b>