Facebook在OSDI 2014上发表论文f4: Facebook's Warm BLOB Storage System,这个系统主要目的就是降低存储成本,在容忍磁盘,主机,机架,数据中心的同时提供2.1倍的存储因子(用户存储的1bit数据实际上占用磁盘2.1bit空间).本文只讨论f4系统的核心Erasure Code部分,如何降低存储因子. Facebook热的blob数据依然存在Haystack中,访问不那么频繁的数据(Warm)放入存储系统f4中.Haystack存储blob的思路就…

Warm up Time Limit: 10000/5000 MS (Java/Others)    Memory Limit: 65535/65535 K (Java/Others) Total Submission(s): 3160    Accepted Submission(s): 718 Problem Description N planets are connected by M bidirectional channels that allow instant transport…

Warm up Problem Description   N planets are connected by M bidirectional channels that allow instant transportation. It's always possible to travel between any two planets through these channels. If we can isolate some planets from others by breaking…

Warm up Time Limit: 10000/5000 MS (Java/Others)    Memory Limit: 65535/65535 K (Java/Others)Total Submission(s): 90    Accepted Submission(s): 12 Problem Description N planets are connected by M bidirectional channels that allow instant transportatio…

Warm up 2 Time Limit: 3000/1000 MS (Java/Others)    Memory Limit: 65535/32768 K (Java/Others)Total Submission(s): 28    Accepted Submission(s): 8 Problem Description Some 1×2 dominoes are placed on a plane. Each dominoe is placed either horizontally…

借用题解上的话,就是乱搞题.. 题意理解错了,其实是坐标系画错了,人家个坐标系,我给当矩阵画,真好反了.对于题目描述和数据不符的问题,果断相信数据了(这是有前车之鉴的hdu 4612 Warm up,明明有重边,出题人欺骗我们的智商)然后就杯具了. 我是用并查集搞得. #include<stdio.h> #include<string.h> ; int mp[MAXN][MAXN]; ]; ]; int find(int x) { return p[x]==x?x:p[x]=fin…

Warm up Time Limit: 10000/5000 MS (Java/Others)    Memory Limit: 65535/65535 K (Java/Others)Total Submission(s): 5093    Accepted Submission(s): 1131 Problem Description N planets are connected by M bidirectional channels that allow instant transport…

Warm up 2 Time Limit: 3000/1000 MS (Java/Others)    Memory Limit: 65535/32768 K (Java/Others) Total Submission(s): 243    Accepted Submission(s): 108 Problem Description Some 1×2 dominoes are placed on a plane. Each dominoe is placed either horizonta…

Warm up 2 Time Limit: 3000/1000 MS (Java/Others)    Memory Limit: 65535/32768 K (Java/Others) Total Submission(s): 656    Accepted Submission(s): 329 Problem Description Some 1×2 dominoes are placed on a plane. Each dominoe is placed either horizonta…

Warm up Time Limit: 10000/5000 MS (Java/Others)    Memory Limit: 65535/65535 K (Java/Others) Total Submission(s): 1398    Accepted Submission(s): 320 Problem Description N planets are connected by M bidirectional channels that allow instant transport…