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线段树的大小为多大？谢迪的解题报告中用线段树的F数组，为什么定义为 3 倍的 X ？不是n个叶子节点的总结点数为2n么？ const int MAXX = 32000; //最大范围 int f[(MAXX + 1) * 3]; //f值 Followed by:
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