A puzzle game

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Johnny has some difficulty memorizing the small prime numbers. So, his computer science teacher has asked him to play with the following puzzle game frequently. The puzzle is a 3x3 board consisting of numbers from 1 to 9. The objective of the puzzle is to swap the tiles until the following final state is reached: 1 2 3 4 5 6 7 8 9 At each step, Johnny may swap two adjacent tiles if their sum is

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solution.cppC++17

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