百草园

摘要： Design an algorithm and write code to serialize and deserialize a binary tree. Writing the tree to a file is called 'serialization' and reading back f... 阅读全文

摘要： Givennpoints on a 2D plane, find the maximum number of points that lie on the same straight line.经过同一个点且斜率相等的直线一定是同一条直线，所以我们只要分别计算每一个点与其它点的直线的斜率，统计斜率的... 阅读全文

摘要： Find all possible combinations ofknumbers that add up to a numbern, given that only numbers from 1 to 9 can be used and each combination should be a u... 阅读全文

摘要： There are n coins with different value in a line. Two players take turns to take one or two coins from left side until there are no more coins left. T... 阅读全文

摘要： Find thekth largest element in an unsorted array.For example,Given[3,2,1,5,6,4]and k = 2, return 5.Note:You may assume k is always valid, 1 ≤ k ≤ arra... 阅读全文

摘要： Given a string S, you are allowed to convert it to a palindrome by adding characters in front of it. Find and return the shortest palindrome you can f... 阅读全文

摘要： After robbing those houses on that street, the thief has found himself a new place for his thievery so that he will not get too much attention. This t... 阅读全文

摘要： Given a 2D board and a list of words from the dictionary, find all words in the board.Each word must be constructed from letters of sequentially adjac... 阅读全文

摘要： There is an integer matrix which has the following features:The numbers in adjacent positions are different.The matrix has n rows and m columns.For al... 阅读全文

摘要： Given n distinct positive integers, integer k (k A, int k, int target) {11 // wirte your code here12 vector > dp(k + 1, vector(target... 阅读全文