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偶的解法:)先把light,heavy设为全集,每次得到light'和heavy'进行以下操作 light=light交light',light=light-heavy heavy=heavy交heavy,heavy=heavy-light 最后在light和heavy里面找只剩下一个元素的那个集合,然后把这个元素打印出来就ok Followed by:
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