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21. 从一个 4 ×4 的棋盘(不可旋转)中选取不在同一行也不在同一列上的两个方格,共有( )种方法。
22. 约定二叉树的根节点高度为 1。一棵结点数为 2016的二叉树最少有(①)个叶子结点;
一棵结点数为 2016 的二叉树最小的高度值是(②)。
填空位置 ① ,填空位置 ② .