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我来说一下为什么每次选择位置最低的区域。其实这个一个强力的减枝条件。因为位置最低的区域是一定要被填充的，所以就要在剩余的蛋糕中寻找有没有能够填充该区域的蛋糕。如果找不到能填充该区域的蛋糕，说明当前的摆放方式不能满足要求，需要回溯。 Followed by:
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