Given inorder and postorder traversal of a tree, construct the binary tree. Note:You may assume that duplicates do not exist in the tree. 题意:根据中序遍历和后序遍历,构建二叉树 思路很清晰,做法很简单,就不讲了. 一开始我写了一个递归的解法,本地测试数据都OK,无奈提交的时候内存超出限制,下面先给出超出内存的代码: /** * Definition for…

Normally, the factorial of a positive integer n is the product of all positive integers less than or equal to n.  For example, factorial(10) = 10 * 9 * 8 * 7 * 6 * 5 * 4 * 3 * 2 * 1. We instead make a clumsy factorial: using the integers in decreasin…

func clumsy(N int) int { var ary []int ; n-- { ary = append(ary, n) } re := N % //4个数字一组 firstgroup := true //最后一组如果不够4个,就补充到4个值,*和/补充1,+和-补充0,这样结果不变 { //不用补充 } { //补充3个 ary = append(ary, ) //补充*1 ary = append(ary, ) //补充/1 ary = append(ary, ) //补充+0…