HF_Cherish

摘要： 1. Question将excel表中的列标题（A、B、C...）转换为对应的列数字返回。Given a column title as appear in an Excel sheet, return its corresponding column number.For example: ... 阅读全文

摘要： 1. Question找数组中的大多数元素，即元素个数超过一般的那个元素Given an array of size n, find the majority element. The majority element is the element that appears more than ⌊ ... 阅读全文

摘要： 1. Question判断一个树是否是平衡二叉树（每个节点的两个子树深度差不超过1）Given a binary tree, determine if it is height-balanced.For this problem, a height-balanced binary tree is d... 阅读全文

摘要： 1. Question求二叉树的最大深度。Given a binary tree, find its maximum depth.The maximum depth is the number of nodes along the longest path from the root node do... 阅读全文

摘要： 1. Question判断一个二叉树是否是对称的。Given a binary tree, check whether it is a mirror of itself (ie, symmetric around its center).For example, this binary tree i... 阅读全文

摘要： 1. Question给定两个二叉树，判断是不是相同（结构相同，值相同）的树。Given two binary trees, write a function to check if they are equal or not.Two binary trees are considered equa... 阅读全文

摘要： 1. Question给定有序链表，删除重复的，使每个元素仅出现一次。2. Solution（O(n)）相似的有Remove Duplicates from Sorted Array，remove element/** * Definition for singly-linked list. * p... 阅读全文

摘要： 1. Questionn级台阶，每次可以走一级或两级，问有多少种走法。You are climbing a stair case. It takes n steps to reach to the top.Each time you can either climb 1 or 2 steps. In... 阅读全文

摘要： 1. Question给定一个非负数，用数组存储其各数位，对这个数加一，返回结果。数组中，最高位在数组头。Given a non-negative number represented as an array of digits, plus one to the number.The digits ... 阅读全文

摘要： 1. Question给定数组和一个值，去掉该数组中的这个值，返回新数组长度。要求操作是in place的，返回的数组元素位置可变，新数组之后的部分无所谓。Given an array and a value, remove all instances of that value in place ... 阅读全文

摘要： 1. Question给定有序数组，去掉其中的重复元素，使得每个元素仅出现一次。要求实现是in place的，即仅能使用常数级的的额外空间。要求返回新数组的长度，同时原数组的该长度内是要求的数，该长度以后的数组内容无所谓。Given a sorted array, remove the duplic... 阅读全文

摘要： 1. Question合并两个有序链表，返回的新链表是通过拼接原来的两个链表得到Merge two sorted linked lists and return it as a new list. The new list should be made by splicing together th... 阅读全文

摘要： 1. Question给一个整型数组，找所有唯一的和为0的三个数的数对。相似的题有2SumGiven an array S of n integers, are there elements a, b, c in S such that a + b + c = 0? Find all unique ... 阅读全文