小二杰

摘要： 题目: Given a positive integer, return its corresponding column title as appear in an Excel sheet. For example: 1 -> A 2 -> B 3 -> C .... 阅读全文

摘要： 题目: Given an array of numbers nums, in which exactly two elements appear only once and all the other elements appear exactly twice. Find the two ... 阅读全文

摘要： 题目: Given an array of integers, find if the array contains any duplicates. Your function should return true if any value appears at least twice in ... 阅读全文

摘要： 题目: Say you have an array for which the ith element is the price of a given stock on day i. Design an algorithm to find the maximum profit. You m... 阅读全文

摘要： 题目: Invert a binary tree. 4 / \ 2 7 / \ / \1 3 6 9 to 4 / \ 7 2 / \ / \9 6 3 1 Trivia: This problem was in... 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 ex... 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 id... 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 ->... 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 f... 阅读全文

摘要： 题目: Given an array of integers, every element appears twice except for one. Find that single one. Note: Your algorithm should have a linear runt... 阅读全文