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leetcode 1079. Letter Tile Possibilities
You have a set of tiles, where each tile has one letter tiles[i]printed on it. Return the number of possible non-empty sequences of letters you can ma ...
分类:其他好文   时间:2020-01-13 10:55:57    阅读次数:73
[LC] 398. Random Pick Index
Given an array of integers with possible duplicates, randomly output the index of a given target number. You can assume that the given target number m ...
分类:其他好文   时间:2020-01-12 09:53:56    阅读次数:64
mysql 索引优化法则
建表语句 mysql 优化法则 1. 全值匹配我最爱(Kappa) 2. 遵循最佳左前缀法则 如果索引了多列, 查询从索引的最左前列开始并且不跳过索引中的列。 其实索引本质是个单向链表, 你要先得到头才能逐渐往后取后面的, 中间断了就走不了后面的索引了。 正确使用 Demo: 违反使用Demo:(完 ...
分类:数据库   时间:2020-01-10 16:05:49    阅读次数:97
Go之第三方库ini
文章转自 快速开始 my.ini # possible values : production, development app_mode = development [paths] # Path to where grafana can store temp files, sessions, an ...
分类:其他好文   时间:2020-01-09 20:25:54    阅读次数:80
UML state diagrams with draw.io
https://about.draw.io/uml-state-diagrams-with-draw-io/ State diagrams have been used in programming to describe the various possible states that a sys ...
分类:其他好文   时间:2020-01-08 10:43:43    阅读次数:96
ef core 自引用类 报错System.Text.Json.JsonException: A possible object cycle was detected which is not supported....
ef core 创建自引用灰了了 public class Menu:IEntity { public int Id { get; set; } public string text { get; set; } public bool group { get; set; } public bool ...
分类:Web程序   时间:2020-01-05 22:36:24    阅读次数:513
OllyDbg
OllyDbg 2.01 September 27, 2013 - version 2.01. OllyDbg, empty language file, chicken language file, Disassembler 2.01 (GPL v3, preliminary version wi ...
分类:数据库   时间:2019-12-31 10:20:38    阅读次数:115
校内友谊赛中等难度题目小记
Problem E : Easy Project Time Limit: 2 s Description Mia and her friends are preparing for the project that the professor has given them! They receive ...
分类:其他好文   时间:2019-12-30 17:20:40    阅读次数:286
hivesql 迁移spark3.0 sparksql报错如Cannot safely cast '字段':StringType to IntegerType的问题
一 问题 hivesql可以正常运行,spark3.0运行报错如图 spark3.0配置 查看源码新增一个 val STORE_ASSIGNMENT_POLICY = buildConf("spark.sql.storeAssignmentPolicy") .doc("When inserting ...
分类:数据库   时间:2019-12-25 20:34:49    阅读次数:162
GHOST CMS - Data Helpers
Data Helpers Data Helpers Data helpers are used to output data from your site. Use this reference list to discover what each handlebars helper can do ...
分类:其他好文   时间:2019-12-22 22:59:27    阅读次数:193
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