题目: Shuffle a set of numbers without duplicates. 分析: 对一组不包含重复元素的数组进行随机重排,reset方法返回最原始的数组,shuffle方法随机返回数组的一个排列, 并且使得获得数组每一个排列的概率都是相同的。为此,可以在初始化 ...
题目描述: Shuffle a set of numbers without duplicates. Example: 解题思路: 每次往后读取数组的时候,当读到第i个的时候以 i的概率随机替换 i中的任何一个数,这样保证最后每个数字出现在每个位置上的概率都是相等的。 证明: 设x元素在第m次的时候出现在位置i的概率是 m,那么在第m 次的时候,x仍然待在位置i的概率是 m m m m 代码描述: ...
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题目: Shuffle a set of numbers without duplicates. 分析: 对一组不包含重复元素的数组进行随机重排,reset方法返回最原始的数组,shuffle方法随机返回数组的一个排列, 并且使得获得数组每一个排列的概率都是相同的。为此,可以在初始化 ...
Shuffle a set of numbers without duplicates. Example: 这道题让我们给数组洗牌,也就是随机打乱顺序,那么由于之前那道题Linked List Random Node我们接触到了水塘抽样Reservoir Sampling的思想 ...
题目: Follow up for "Search in Rotated Sorted Array": What if duplicates are allowed? Would this affect the run-time complexity? How and why? Write ...
题目: There are two sorted arrays A and B of size m and n respectively. Find the median of the two sor ...
题目: Suppose a sorted array is rotated at some pivot unknown to you beforehand. (i.e., 0 1 2 4 5 6 7 might become 4 5 6 7 0 1 2). You are given ...
题目: Suppose a sorted array is rotated at some pivot unknown to you beforehand. (i.e., 0 1 2 4 5 6 7 might become 4 5 6 7 0 1 2). Find ...
题目: Given a sorted array, remove the duplicates in place such that each element appear only once and return the new length. Do not allocate extra ...
题目: Given an array where elements are sorted in ascending order, convert it to a height balanced BST. 题解: 先复习下什么是二叉搜索树(引自Wikipedia): 二叉查找树(Binary ...