[BFS]正向BFS+hash解決八碼問題

八數碼問題，能夠用單向廣搜、雙向廣搜、A*、IDA等多種方法求解。具體能夠參考：八數碼的八境界html Descriptionnode The 15-puzzle has been around for over 100 years; even if you don't know it by that name, you've seen it. It is constructed with 15

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