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<metaname="description"content="problemGiven 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.">
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<metaname="description"content="problemGiven an array of integers, find two numbers such that they add up to a specific target number. The function twoSum should return indices of the two numbers such that they add up to the target,">
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<metaname="description"content="Pcre Perl Compatible Regular Expressions (PCRE) is a regular expression C library inspired by the regular expression capabilities in the Perl programming language, written by Philip Hazel, starting in">
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<metaname="description"content="Number of 1 Bits Write a function that takes an unsigned integer and returns the number of ’1’ bits it has (also known as the Hamming weight). For example, the 32-bit integer ‘11’ has binary represent">
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<metaname="description"content="Reverse Bits Reverse bits of a given 32 bits unsigned integer.For example, given input 43261596 (represented in binary as 00000010100101000001111010011100), return 964176192 (represented in binary as">
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<metaname="description"content="Reverse IntegerReverse digits of an integer.Example1: x = 123, return 321Example2: x = -123, return -321">
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<metaname="description"content="problemYou are given two linked lists representing two non-negative numbers. The digits are stored in reverse order and each of their nodes contain a single digit. Add the two numbers and return it as">
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<metaname="description"content="**Longest Substring Without Repeating Characters **">
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<metaname="description"content="Invert a binary tree 4 / \ 2 7 / \ / \ 1 3 6 9 to 4 / \ 7 2 / \ / \ 9 6 3 1 Trivia:This problem was inspired by this original tweet by Max Howell: Goog">
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<metaname="description"content="question34. Search for a RangeOriginal Page Given a sorted array of integers, find the starting and ending position of a given target value. Your algorithm’s runtime complexity must be in the order of">
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<metaname="description"content="problemA binary watch has 4 LEDs on the top which represent the hours (0-11), and the 6 LEDs on the bottom represent the minutes (0-59). Each LED represents a zero or one, with the least significant">
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<metaname="description"content="problemGiven an array of n positive integers and a positive integer s, find the minimal length of a subarray of which the sum ≥ s. If there isn’t one, return 0 instead. For example, given the array">
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<metaname="description"content="problemGiven a sorted integer array without duplicates, return the summary of its ranges. For example, given [0,1,2,4,5,7], return ["0->2","4->5","7"]. 题解每一个区间的起点nu">
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<metaname="description"content="原谅我的标题党,其实这些工具的确很厉害,之前其实介绍过一点相关的,是从我一次问题排查的过程中用到的,但是最近又有碰到一次排查问题,发现其实用 idea 直接 dump thread 是不现实的,毕竟服务器环境的没法这么操作,那就得用 Java 的那些工具了 jstack & jps譬如 jstack,这个命令其实不能更简单了看看 help 信息用-l参数可以打出锁的额外信息,然后后面的 p">
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<metaname="description"content="用了比较久的 grep 命令,其实都只是用了最最基本的功能来查日志, 譬如 grep 'xxx' xxxx.log 然后有挺多情况比如想要找日志里带一些符号什么的,就需要用到一些特殊的 比如这样\"userId\":\"123456\",因为比如用户 ID 有时候会跟其他的 id 一样,只用具体的值 123456 来查的话干扰信息太多了">
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<metaname="description"content="又做了个题,看记录是以前用 C++写过的,现在捋一捋思路,用 Java 再写了一下,思路还是比较清晰的,但是边界细节处理得比较差 简要介绍Given a string s, find the length of the longest substring without repeating characters. 样例Example 1:Input: s = "abcabcbb">
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<metaname="description"content="题目介绍Design a stack that supports push, pop, top, and retrieving the minimum element in constant time.设计一个栈,支持压栈,出站,获取栈顶元素,通过常数级复杂度获取栈中的最小元素 push(x) – Push element x onto stack. pop() – Removes the el">
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<metaname="description"content="题目介绍Given preorder and inorder traversal of a tree, construct the binary tree.给定一棵树的前序和中序遍历,构造出一棵二叉树 注意You may assume that duplicates do not exist in the tree.你可以假设树中没有重复的元素。(PS: 不然就没法做了呀) 例子:preorder">
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<metaname="description"content="前几天同事问了我个 mysql 索引的问题,虽然大概知道,但是还是想来实践下,就是 is null,is not null 这类查询是否能用索引,可能之前有些网上的文章说都是不能用索引,但是其实不是,我们来看个小试验 CREATE TABLE `null_index_t` ( `id` int(10) unsigned NOT NULL AUTO_INCREMENT, `null_key`">
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<metaname="description"content="题目介绍写一个程序找出两个单向链表的交叉起始点,可能是我英语不好,图里画的其实还有一点是交叉以后所有节点都是相同的Write a program to find the node at which the intersection of two singly linked lists begins. For example, the following two linked lists:begin">
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<metaname="description"content="题目介绍A path in a binary tree is a sequence of nodes where each pair of adjacent nodes in the sequence has an edge connecting them. A node can only appear in the sequence at most once. Note that the pat">
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<metaname="description"content="很多东西都是时看时新,而且时间长了也会忘,所以再来复习下,也会有一些新的角度看法这次来聊下AQS的内容,主要是这几个点, 第一个线程第一个线程抢到锁了,此时state跟阻塞队列是怎么样的,其实这里是之前没理解对的地方 /** * Fair version of tryAcquire. Don't grant access unless * recursive">
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<metaname="description"content="题目介绍You are given an array prices where prices[i] is the price of a given stock on the ith day. You want to maximize your profit by choosing a single day to buy one stock and choosing a different day">
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<metaname="description"content="top 命令在日常的 Linux 使用中,特别是做一些服务器的简单状态查看,排查故障都起了比较大的作用,但是由于这个命令看到的东西比较多,一般只会看部分,或者说像我这样就会比较片面地看一些信息,比如默认是进程维度的,可以在启动命令的时候加-H进入线程模式 -H :Threads-mode operation Instructs top to display individ">
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<metaname="description"content="这里需要说道函数和返回值了可以看书上的这个例子对于这种情况,当进入函数内部时,会把传入的变量的所有权转移进函数内部,如果最后还是要返回该变量,但是如果此时还要返回别的计算结果,就可能需要笨拙地使用元组 引用此时我们就可以用引用来解决这个问题 fn main() &#123; let s1 = String::from("hello"); let len = calculate_le">
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<metaname="description"content="最近在看 《rust 权威指南》,还是难度比较大的,它里面的一些概念跟之前的用过的都有比较大的差别比起有 gc 的虚拟机语言,跟像 C 和 C++这种主动释放内存的,rust 有他的独特点,主要是有三条 Rust中的每一个值都有一个对应的变量作为它的所有者。 在同一时间内,值有且只有一个所有者。 当所有者离开自己的作用域时,它持有的值就会被释放掉。这里有两个重点: s 在进入作用域后才变得有效">