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【题目】二叉树可以用常规的三种遍历结果来描述其结构，但是不够直观，尤其是二叉树中有重复值的时候，仅通过三种遍历的结果来构造二叉树的真实结构更是难上加难，有时则根本不可能。给定一棵二叉树的头节点head，已知二叉树节点值的类型为32位整型，请实现一个打印二叉树的函数，可以直观地展示树的形状，也便于画出 阅读全文
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Given a tree, you are supposed to tell if it is a complete binary tree. Input Specification: Each input file contains one test case. For each case, th 阅读全文
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Formation is very important when taking a group photo. Given the rules of forming K rows with Npeople as the following: The number of people in each r 阅读全文
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The basic task is simple: given N real numbers, you are supposed to calculate their average. But what makes it complicated is that some of the input n 阅读全文