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<div><span style="font-size: medium">　　受校门外的树这道经典问题的启发，A君根据基本的离散数学的知识，抽象出5种运算维护集合S(S初始为空)并最终输出S。现在，请你完成这道校门外的树之难度增强版&mdash;&mdash;校门外的区间。</span></div>
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