Error Correction Time Limit: 2 Seconds      Memory Limit: 65536 KB A boolean matrix has the parity property when each row and each column has an even sum, i.e. contains an even number of bits which are set. Here's a 4 x 4 matrix which has the parity…

Error Correction Time Limit: 1000MS   Memory Limit: 65536K Total Submissions: 6825   Accepted: 4289 Description A boolean matrix has the parity property when each row and each column has an even sum, i.e. contains an even number of bits which are set…

FEC(Forward Error Correction)前向纠错 UDP\RTP 中使用用于改善无线等网络丢包等问题 算法暂不介绍. 思路:FEC ENCODE 增加冗余包,当无线等网络丢包之后,接收端使用冗余包可将丢失的包DECODE出来. 举例:10个包,编码后会增加2个包,共12个包发送到接收端,接收端丢失第5和第9包,仅靠剩下的10个包就可以解出第5和第9包. 结果就是,接收端接收到了完整的10个包,代价仅仅是增加了冗余和cpu编解码的消耗. 参考: 1. RTP抗丢包传输方案 点击打…

Error Correction Time Limit: 1000MS   Memory Limit: 65536K Total Submissions: 6014   Accepted: 3886 Description A boolean matrix has the parity property when each row and each column has an even sum, i.e. contains an even number of bits which are set…

QR Code Error Correction - QRStuff.com https://blog.qrstuff.com/2011/12/14/qr-code-error-correction Information capacity and versions of QR Code | QRcode.com | DENSO WAVE https://www.qrcode.com/en/about/version.html So here are the take-outs: The low…

Description A boolean matrix has the parity property when each row and each column has an even sum, i.e. contains an even number of bits which are set. Here's a 4 x 4 matrix which has the parity property: 1 0 1 0 0 0 0 0 1 1 1 1 0 1 0 1 The sums of t…

引用 跟一个网友就有关IPsec的网络加速以及降低延迟等问题进行了一些讨论,并总结了一写粗浅的看法. 因为FEC的资料并不多,所以分享出来,希望能被有需要的人看见:) 先说一下FEC. 我们使用ipsec的本质,就是在IP层之上建立一条软件的点到点通信链路.通过internet到底任意地方. 由于internet的广域性,或者传输介质或者距离的限制等,倒是数据包的丢失,损坏,高延迟扥各种问题. 对比于专线的方案.我们可是改善介质,做链路保障等提高服务质量. 那么在VirtualPN软件的层面上我…

ECC的全称是 Error Checking and Correction or Error correction Coding,是一种用于差错检测和修正的算法.上一节的BBM中我们提到过,NAND闪存在生产和使用中都会产生坏块,BBM就是坏块的管理机制,而要有效管理坏块的首要前提就是有可靠的坏块检测手段.如果操作时序和电路稳定性不存在问题,NAND闪存出错的时候一般不会造成整个Block或Page不能读取甚至全部出错,而是整个Page中只有一个或几个bit出错,这时候 ECC就能发挥作用了.不…

Dictionary不一定是个list,它可以是多种形式. 放弃Hash的原因: 通常,tree是比较适合的结构. From: http://www.cnblogs.com/v-July-v/archive/2011/06/07/2075992.html B--tree B-树又叫平衡多路查找树.一棵m阶的B-树 (m叉树)的特性如下: 树中每个结点最多含有m个孩子(m>=2): 除根结点和叶子结点外,其它每个结点至少有[ceil(m / 2)]个孩子(其中ceil(x)是一个取上限的函数):…

Return value/code Description 0x00030200 STG_S_CONVERTED The underlying file was converted to compound file format. 0x00030201 STG_S_BLOCK The storage operation should block until more data is available. 0x00030202 STG_S_RETRYNOW The storage operatio…