[kuangbin]POJ 3414 pots&&bfs简单搜索&&路径还原&&状态搜索

题目描述：html You are given two pots, having the volume of A and B liters respectively. The following operations can be performed:node FILL(i)        fill the pot i (1 ≤ i ≤ 2) from the tap; DROP(i)     

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