Given a binary tree, return all duplicate subtrees. For each kind of duplicate subtrees, you only need to return the root node of any oneof ...
Given a list of directory info including directory path, and all the files with contents in this directory, you need to find out all the groups of duplicate files in the file system in terms of their ...
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Given a binary tree, return all duplicate subtrees. For each kind of duplicate subtrees, you only need to return the root node of any oneof ...
Given an array nums containing n + 1 integers where each integer is between 1 and n (inclusive), prove that at least one duplicate number must ...
对于一个长度为n+1的数组,其中每一个值的取值范围是[1,n],可以证明的是必然存在一个重复数字(抽屉原理),假设仅存在一个重复数字,找到他。 举例:输入:[1,3,4,2,1],输出:1 自己做的时候,要么时间复杂度到o(n2),要么需要额外的存储空间利用hashset,下面来分析一下 ...
Given an array nums containing n + 1 integers where each integer is between 1 and n (inclusive), prove that at least one duplicate number must exist. ...
letter at a random position. Find the letter that was a ...
Write a SQL query to find all duplicate emails in a table named Person. For example, your query should return the following for the above table ...
Design an in-memory file system to simulate the following functions: ls: Given a path in string format. If it is a file path, return a list ...
to find an index mapping P, from A to B. A mapping P[ ...