given a number of consecutive moves of queen, check for their validity based on their previous position....
but remember if u get an invalid move - u need check for the next move's validity based on the last valid position.....
Which doors are open?
Sum all integers from 1 to 2^n
"Look and say" sequence
Multiply a column by a row
Queen's move - 02
Minimal Path - 01
Minimal Path - 04
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