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Car parking problem

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Car parking problem. An array given represents the actual order of cars need to be parked. Like for example order is 4,6,5,1,7,3,2,empty. If cars are parked in some order like empty,1,2,3,7,6,4,2. Some person needs to get them into the correct order, list out all instructions to the person to get in the correct order with least number of swaps.

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