线段树入门学习(兼解HDU1754) - 心中的利剑：HTML5 Canvas游戏动画（JavaScript） - ITeye技术网站


线段树入门学习(兼解HDU1754) - 心中的利剑：HTML5 Canvas游戏动画（JavaScript） - ITeye技术网站

   线段树也叫区间树，顾名思义，线段树是一种基于区间的树，每个节点表示一个"线段"或"区间"。树的根节点表示是"整体"的区间，左右子树分别表示这个区间的左半边和右半边。

基本结构及性质

  假设要构造一个表示N个区间大小的线段树，线段树的根节点表示区间[0,N-1]，然后将区间分成两半，分别为左右子树表示，这样的线段树的节点只有2N-1个，是O(N)级别的，如图所示表示构造区间[1-5]的线段树。




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