How to Count Univalue Subtrees in a Binary Tree?

  • 时间：2020-09-28 16:28:51
  • 分类：网络文摘
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Given a binary tree, count the number of uni-value subtrees. A Uni-value subtree means all nodes of the subtree have the same value. Example : Input: root = [5,1,5,5,5,null,5] 5 / \ 1 5 ... ...

SQL Algorithm to Compute Shortest Distance in a Plane

  • 时间：2020-09-28 16:28:51
  • 分类：网络文摘
  • 阅读：118 次
Given the following SQL Schema, CREATE TABLE If Not Exists point_2d (x INT NOT NULL, y INT NOT NULL) Truncate table point_2d insert into point_2d (x, y) values ('-1', '-1') insert into point_2d (x, y) values ('0', '0') insert into point... ...

4 Tips You Shouldn’t Miss While Creating Your Ideal Websit

  • 时间：2020-09-28 16:28:51
  • 分类：网络文摘
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The importance of having a website for your business is well-documented. It is crucial for the overall growth of the business as it plays an important role in making it visible to a wider audience. It’s all about making potential customers ... ...

How to Convert Float Number (Fraction) to Hexadecimal in Python?

  • 时间：2020-09-28 16:28:51
  • 分类：网络文摘
  • 阅读：98 次
We known that in Javascript, we can use the toString(16) to convert an integer to its hexadecimal representation. That works even for float numbrs, for example, 1 2 3 4 5 6 (0.5).toString(16) "0.8" (1.5)... ...

How to Compute the Clumsy Factorials using Iterative Algorithm?

  • 时间：2020-09-28 16:28:51
  • 分类：网络文摘
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Normally, the factorial of a positive integer n is the product of all positive integers less than or equal to n. For example, factorial(10) = 10 * 9 * 8 * 7 * 6 * 5 * 4 * 3 * 2 * 1. We instead make a clumsy factorial: using the integers in... ...

How to Implement Quicksort Algorithm in Python – the Pytho

  • 时间：2020-09-28 16:28:51
  • 分类：网络文摘
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In here, we talk about the implementation of QuickSort in Python – the well-known and standard sorting algorithm that is used today. It is not so easy to implement except in Python, in a Pythonic way. The quicksort algorithm can be ea... ...

How to Flip Equivalent Binary Trees?

  • 时间：2020-09-28 16:28:51
  • 分类：网络文摘
  • 阅读：103 次
For a binary tree T, we can define a flip operation as follows: choose any node, and swap the left and right child subtrees. A binary tree X is flip equivalent to a binary tree Y if and only if we can make X equal to Y after some number of... ...

How to Compute Kth Largest Element in a Stream?

  • 时间：2020-09-28 16:28:51
  • 分类：网络文摘
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Design a class to find the kth largest element in a stream. Note that it is the kth largest element in the sorted order, not the kth distinct element. Your KthLargest class will have a constructor which accepts an integer k and an integer ... ...

Python: Understanding the Importance of EigenValues and EigenVec

  • 时间：2020-09-28 16:28:51
  • 分类：网络文摘
  • 阅读：99 次
First of all EigenValues and EigenVectors are part of Linear Algebra. The branch of Mathematics which deals with linear equations, matrices, and vectors. The prime focus of the branch is vector spaces and linear mappings between vector spac... ...

How to Check If Four Points can Make a Valid Square (C++ and Jav

  • 时间：2020-09-28 16:28:51
  • 分类：网络文摘
  • 阅读：128 次
four-points-square Given the coordinates of four points in 2D space, return whether the four points could construct a square. The coordinate (x,y) of a point is represented by an integer array with two integers. Example: Input: p1 = [0,0],... ...