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fringe
2024-09-25
sicp每日一题[2.28]
Exercise2.28Writeaprocedurefringethattakesasargumentatree(representedasalist)andreturnsalistwhoseelementsarealltheleavesofthetreearrangedinleft-to-rightorder.Forexample,(definex(list(list12)(list34)))(fringex)