文件名称:question1
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从多层树中取得偶数生成列,取得动态目标值的个数,从两个不同的树中,提取第二个树中独有的元素(和第一个树的元素不同的元素),并计算其和。-Generated columns to obtain an even number, the target value obtained from the dynamic multi-tree, from two different tree, extracts a second element that is unique in the tree (a tree of elements and different elements), and and calculate its.
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question1.lisp