discovery presents channel contest
AtCoder Beginner Contest 242 Ex Random Painting
[洛谷传送门](https://www.luogu.com.cn/problem/AT_abc242_h "洛谷传送门") [AtCoder 传送门](https://atcoder.jp/contests/abc242/tasks/abc242_h "AtCoder 传送门") 好久没复习过 mi ......
AtCoder Beginner Contest 221 G Jumping sequence
[洛谷传送门](https://www.luogu.com.cn/problem/AT_abc221_g "洛谷传送门") [AtCoder 传送门](https://atcoder.jp/contests/abc221/tasks/abc221_g "AtCoder 传送门") 这个数据范围让我们 ......
AtCoder Beginner Contest 291 DEF
# [AtCoder Beginner Contest 291](https://atcoder.jp/contests/abc291) ## D - Flip Cards ### Problem Statement 题意：$N$张卡片，编号$1$到$N$,每张卡片有正反两面，写有数字，初始状态都是 ......
AtCoder Beginner Contest 294 E
# [AtCoder Beginner Contest 294](https://atcoder.jp/contests/abc294) ## E - 2xN Grid ### Problem Statement 题意：给你$2$行长度为$L$的矩阵。告诉你格子里面的数字，以$vi$ $li$的形式 ......
AtCoder Beginner Contest 302 ABCDEF
# [AtCoder Beginner Contest 302](https://atcoder.jp/contests/abc302) ## **A - Attack** ### Problem Statement 题意：敌人有$A$的耐力值，每次攻击敌人可以减少$B$的耐力值，问多少次敌人耐力值 ......
AtCoder Beginner Contest 305 ABCDE
# [AtCoder Beginner Contest 305](https://atcoder.jp/contests/abc305) ## A - Water Station ### Problem Statement 题意：水站每$5km$设一个，给你一个$N$ $km$的位置，问你离它最近的 ......
AtCoder Beginner Contest 275 G Infinite Knapsack
[洛谷传送门](https://www.luogu.com.cn/problem/AT_abc275_g "洛谷传送门") [AtCoder 传送门](https://atcoder.jp/contests/abc275/tasks/abc275_g "AtCoder 传送门") 原问题等价于： > ......
[6] Fast and Practical Secret Key Extraction by Exploiting Channel Response 论文精读 INFOCOM 13'
摘要 摘要写的很清楚，几句话说明了当前密钥发展现状，即使用RSS为基础的密钥生成解决方案的生成速率有待提升，因此本文主打一个高速率；此外本文提出了CGC算法来解决现实生活中的信道互易性差的问题；此外，其能够抵御被认为对RSS技术有害的恶意攻击！ 但是他的Abstract我有一点不满哈，全文都是CSI ......
AtCoder Beginner Contest 253 Ex We Love Forest
[洛谷传送门](https://www.luogu.com.cn/problem/AT_abc253_h "洛谷传送门") [AtCoder 传送门](https://atcoder.jp/contests/abc253/tasks/abc253_h "AtCoder 传送门") 没做出来。 考虑求 ......
AtCoder Beginner Contest 298 Ex Sum of Min of Length
[洛谷传送门](https://www.luogu.com.cn/problem/AT_abc298_h "洛谷传送门") [AtCoder 传送门](https://atcoder.jp/contests/abc298/tasks/abc298_h "AtCoder 传送门") 挺无脑的。是不是因 ......
AtCoder Beginner Contest 251 G Intersection of Polygons
[洛谷传送门](https://www.luogu.com.cn/problem/AT_abc251_g "洛谷传送门") [AtCoder 传送门](https://atcoder.jp/contests/abc251/tasks/abc251_g "AtCoder 传送门") 经典结论，一个点 ......
AtCoder Beginner Contest 220 G Isosceles Trapezium
[洛谷传送门](https://www.luogu.com.cn/problem/AT_abc220_g "洛谷传送门") [AtCoder 传送门](https://atcoder.jp/contests/abc220/tasks/abc220_g "AtCoder 传送门") 简单题。 首先肯定 ......
ActiveMQ InactivityIOException: Channel was inactive for too (>30000) long 处理方案
生产服务器上，MQ Produce和consumer端同时报如下错误，导致不能正常工作。 Transport (tcp://132.97.122.168:61616) failed, reason: org.apache.activemq.transport.InactivityIOExceptio ......
Present
C. Present time limit per test 2 seconds memory limit per test 256 megabytes input standard input output standard output Little beaver is a beginner p ......
AtCoder Beginner Contest 227 E Swap
[洛谷传送门](https://www.luogu.com.cn/problem/AT_abc227_e "洛谷传送门") [AtCoder 传送门](https://atcoder.jp/contests/abc227/tasks/abc227_e "AtCoder 传送门") 感觉是很裸的题。 ......
AtCoder Beginner Contest 249 G Xor Cards
[洛谷传送门](https://www.luogu.com.cn/problem/AT_abc249_g "洛谷传送门") [AtCoder 传送门](https://atcoder.jp/contests/abc249/tasks/abc249_g "AtCoder 传送门") 好题。 套路地，考 ......
AtCoder Beginner Contest 305 题解 A - F
## [A](https://atcoder.jp/contests/abc305/tasks/abc305_a) - Water Station ### 题目大意 找到离给定的数最近的一个 $5$ 的倍数输出即可。 ### 解题思路 我们取这个数对 $5$ 的上下界，也就是整数除以 $5$ 再乘以 ......
AtCoder Beginner Contest 219 H Candles
[洛谷传送门](https://www.luogu.com.cn/problem/AT_abc219_h "洛谷传送门") [AtCoder 传送门](https://atcoder.jp/contests/abc219/tasks/abc219_h "AtCoder 传送门") 套路化了。 比较显 ......
AtCoder Beginner Contest 223 H Xor Query
[洛谷传送门](https://www.luogu.com.cn/problem/AT_abc223_h "洛谷传送门") [AtCoder 传送门](https://atcoder.jp/contests/abc223/tasks/abc223_h "AtCoder 传送门") 考虑一个无脑做法： ......
AtCoder Beginner Contest 215 H Cabbage Master
[洛谷传送门](https://www.luogu.com.cn/problem/AT_abc215_h "洛谷传送门") [AtCoder 传送门](https://atcoder.jp/contests/abc215/tasks/abc215_h "AtCoder 传送门") 考虑第一问。 发现 ......
AtCoder Regular Contest 141 C Bracket and Permutation
[洛谷传送门](https://www.luogu.com.cn/problem/AT_arc141_c "洛谷传送门") [AtCoder 传送门](https://atcoder.jp/contests/arc141/tasks/arc141_c "AtCoder 传送门") 考虑给出 $S$， ......
AtCoder Beginner Contest 273(E)
# AtCoder Beginner Contest 273(E) ## E(链式结构，思维) [E](https://atcoder.jp/contests/abc273/tasks/abc273_e) 题目大意就是原本有一个空的序列，我们后面会进行$q$次操作，每次操作我们都需要输出此时的序列的 ......
STM32F429 Discovery开发板应用：使用FreeRTOS队列+DMA双缓存实现串口数据接收
参考帖子：https://blog.csdn.net/freedompoi/article/details/122350866 目前想要实现STM32F4自带的DMA双缓冲区，尝试过一版，结果不能预期，就使用了RxHalfCplt和RxCplt去实现DMA双缓冲区的效果。 现在有时间了，又重新实现S ......
AtCoder Beginner Contest 265 F Manhattan Cafe
[洛谷传送门](https://www.luogu.com.cn/problem/AT_abc265_f "洛谷传送门") [AtCoder 传送门](https://atcoder.jp/contests/abc265/tasks/abc265_f "AtCoder 传送门") 考虑 dp，$f_ ......
Atcoder Beginner Contest 301
*** ### A - [Overall Winner](https://atcoder.jp/contests/abc301/tasks/abc301_a) #### 题目大意 >A和T两人玩游戏, 给定一串只由A和T组成的字符串, 如果第i个字符是A, 则A赢得第i轮的胜利, 反之则T赢; 当遍 ......
UNIQUE VISION Programming Contest 2023 New Year (AtCoder Beginner Contest 287) ABCDE
# [UNIQUE VISION Programming Contest 2023 New Year (AtCoder Beginner Contest 287)](https://atcoder.jp/contests/abc287) ## A - Majority ### Problem Sta ......
AtCoder Beginner Contest 278 ABCDE
# [AtCoder Beginner Contest 278](https://atcoder.jp/contests/abc278) ## A - Shift ### Problem Statement 题意：给你一个长度为n的序列，让你移走前面k个后面补k个0。 ### Solution 思路 ......
AtCoder Beginner Contest 284 ABCDE
# [AtCoder Beginner Contest 284](https://atcoder.jp/contests/abc284/tasks) ## A - Sequence of Strings ### Problem Statement 题意：给你n个字符串，让你倒序输出 ### Solv ......
AtCoder Beginner Contest 302
*** ### A - [Attack](https://atcoder.jp/contests/abc302/tasks/abc302_a) #### 题目大意 >给定两个数a和b, 问我们需要进行多少次a-b, 才能让a小于等于0 #### 解题思路 >签到题不多嗦了 #### 神秘代码 ``` ......