小结: 1.xy平面 与 直和 https://en.wikipedia.org/wiki/Direct_sum For example, the xy-plane, a two-dimensional vector space, can be thought of as the direct sum of two one-dimensional vector spaces, namely the x and y axes. In this direct sum, the x and y ax…
小结: 1.block diagonal matrix 直和 块对角矩阵 A block diagonal matrix is a block matrix that is a square matrix, and having main diagonal blocks square matrices, such that the off-diagonal blocks are zero matrices. A block diagonal matrix A has the form wher…
Name Character Unicode code point (decimal) Standard Description quot " U+0022 (34) XML 1.0 double quotation mark amp & U+0026 (38) XML 1.0 ampersand apos ' U+0027 (39) XML 1.0 apostrophe (apostrophe-quote) lt < U+003C (60) XML 1.0 less-than s…
http://www.htmlentities.com/html/entities/ The view below displays the characters used in the official W3C HTML and XHTML specifications in readable form, including previews of the actual characters. Mind you not all user agents (browsers) support a…
A character entity reference refers to the content of a named entity. An entity declaration is created by using the <!ENTITY name "value"> syntax in a Document Type Definition (DTD).In SGML, HTML and XML documents, the logical constructs k…
这一周的作业,刚压线写完.Problem3 没有写,不想证明了.从Problem 9 开始一直到最后难度都挺大的,我是在论坛上看过了别人的讨论才写出来的,挣扎了很久. Problem 9在给定的基上分解向量,里面调用了hw4的一些函数,通过solve函数获得矩阵方程的解 Problem 10判断矩阵是不是可逆的,注意判断矩阵是不是square的 Problem 11和Problem 12 都是求逆,也是解方程,只是函数的参数需要参考一下源码 发现一个有趣的事情,Coding the Matrix…
Let's begin with a naive method. We first need to sort the array A[n]. And we want to solve the problem by iterating through A from beginning and ending. Then, if the sum is less than the target, we move the leading pointer to next right. When the su…
http://blog.sina.com.cn/s/blog_61cd89f60102eej1.html 1.direct path read temp select TOTAL_BLOCKS,USED_BLOCKS from v$sort_segment; 看看是不是在不段增加select * from v$sysstat where NAME LIKE '%workarea executions%'; 看看是不是在不段增加select operation_id,operation_type,…
https://golangbyexample.com/go-mod-sum-module/ Understanding go.sum and go.mod file in Go (Golang) – Welcome To Golang By Example https://golangbyexample.com/go-mod-sum-module/ Table of Contents Overview Example Example of indirect dependency in go.m…
题目链接:Path Sum II | LeetCode OJ Given a binary tree and a sum, find all root-to-leaf paths where each path's sum equals the given sum. For example: Given the below binary tree and sum = 22, 5 / \ 4 8 / / \ 11 13 4 / \ / \ 7 2 5 1 return [ [5,4,11,2],…
题目链接:Path Sum | LeetCode OJ Given a binary tree and a sum, determine if the tree has a root-to-leaf path such that adding up all the values along the path equals the given sum. For example: Given the below binary tree and sum = 22, 5 / \ 4 8 / / \ 11…
Sum of Consecutive Prime Numbers Time Limit: 1000MS Memory Limit: 65536K Total Submissions: 20050 Accepted: 10989 Description Some positive integers can be represented by a sum of one or more consecutive prime numbers. How many such representatio…
You are given a binary tree in which each node contains an integer value. Find the number of paths that sum to a given value. The path does not need to start or end at the root or a leaf, but it must go downwards (traveling only from parent nodes to…
Given a non-empty array containing only positive integers, find if the array can be partitioned into two subsets such that the sum of elements in both subsets is equal. Note: Both the array size and each of the array element will not exceed 100. Exam…
Given an array which consists of non-negative integers and an integer m, you can split the array into m non-empty continuous subarrays. Write an algorithm to minimize the largest sum among these m subarrays. Note:Given m satisfies the following const…
Find the sum of all left leaves in a given binary tree. Example: 3 / \ 9 20 / \ 15 7 There are two left leaves in the binary tree, with values 9 and 15 respectively. Return 24. 这道题让我们求一棵二叉树的所有左子叶的和,那么看到这道题我们知道这肯定是考二叉树的遍历问题,那么最简洁的写法肯定是用递归,由于我们只需要累加左子叶…
Given an integer array with all positive numbers and no duplicates, find the number of possible combinations that add up to a positive integer target. Example: nums = [1, 2, 3] target = 4 The possible combination ways are: (1, 1, 1, 1) (1, 1, 2) (1,…
Calculate the sum of two integers a and b, but you are not allowed to use the operator + and -. Example: Given a = 1 and b = 2, return 3. Credits:Special thanks to @fujiaozhu for adding this problem and creating all test cases. 这道题是CareerCup上的一道原题,难道…
Given a nested list of integers, return the sum of all integers in the list weighted by their depth. Each element is either an integer, or a list -- whose elements may also be integers or other lists. Different from the previous question where weight…
Given a non-empty 2D matrix matrix and an integer k, find the max sum of a rectangle in the matrix such that its sum is no larger than k. Example: Given matrix = [ [1, 0, 1], [0, -2, 3] ] k = 2 The answer is 2. Because the sum of rectangle [[0, 1], […
Given a nested list of integers, return the sum of all integers in the list weighted by their depth. Each element is either an integer, or a list -- whose elements may also be integers or other lists. Example 1: Given the list [[1,1],2,[1,1]], return…
