摘要： 题目： Given a column title as appear in an Excel sheet, return its corresponding column number. For example: 阅读全文

摘要： 题目: Given two strings s and t, write a function to determine if t is an anagram of s. For example,s = "anagram", t = "nagaram", return true.s = "rat", 阅读全文

摘要： 题目： Given two binary trees, write a function to check if they are equal or not. Two binary trees are considered equal if they are structurally identic 阅读全文

摘要： 题目： Write a function to delete a node (except the tail) in a singly linked list, given only access to that node. Supposed the linked list is 1 -> 2 -> 阅读全文

摘要： 题目： Given an array nums, write a function to move all 0's to the end of it while maintaining the relative order of the non-zero elements. For example, 阅读全文

摘要： 题目： Invert a binary tree. 翻转二叉树。 递归，每次对节点的左右节点调用invertTree函数，直到叶节点。 python中也没有swap函数，当然你可以写一个，不过python中可以通过：a, b = b, a交换两个变量的值 阅读全文

摘要： 题目： Given a binary tree, find its maximum depth. The maximum depth is the number of nodes along the longest path from the root node down to the farthe 阅读全文