集合合并时间上界是O(n)的集合表示法是( )\n \n \n \n \n \n \n

\n \n \n \n A.\n 位向量表示法\n

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\n \n \n \n B.\n 元素表表示法\n

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\n \n \n \n C.\n 树结构表示法\n