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-locking, consistent read. However, the definition of snapshot data is not the same. Under the RC transaction isolation level, for snapshot data, non-conforming reads are always locked to the latest snapshot data of the row. At the RR transaction isolation level, for snapshot data, non-conforming reads always read the row data version at the beginning of the transaction. That is, the RC level will see the latest version of the data after other transactions are committed. The RR level always read

] = u;//continuously pushes the visited point into the stack for (int i = Head[u];~i;i = E[i].nex) { v = e[i].v; if (!vis[v]) { sum_son++; FA[V] = u; Tarjan (v); Low[u] = min (low[u],low[v]); if (Low[v] > Dfs_pos[u]) { cnt_bri++;//number of dual-link components, one more bridge is more than one double-unicom component } }else if (v! = fa[u]) low[u] = Min (Low[u],low[v]); } if (dfs_pos[u] = = Low[u])//When the DFS s

targetit seems that when pruning, how to cut, are learning! 3.4 Arrangement (permutation)30-substring with concatenation of any Words (hard): You is given a string, s, and a list of Words, Words, that Is all of the same length. Find all starting indices of substring (s) in S that's a concatenation of each word in words exactly once and without any Intervening characters.For example, given:s: "Barfoothefoobarman", Words: ["foo", "Bar"]You should return the indices: [0,9]. (Order does not matter)

small to the large string of N-storey tower \ n, the purpose of the game is to move the tower on the leftmost pole to the right side of the pole, provided that only one disk can be moved at a time, \ n and does not allow the market to be placed on a small plate. If you enter any characters other than 2~7, then n=4\n" " defg (x, y): S4=x==1 and ' '*7or "'S3="-"* (ABS (x-y) ==2 and12or5) S3= X>y ands3+">" or ""+S3PrintS4+STR (x) +s3+Str (y)return defMove (n,z,m,y):ifN>0:move (n-1, Z,y,m

iterator (iterator) protocol, the iterator Protocol needs to be implemented __iter__ , the next interface • Ability to pause the execution of code in a function body by repeatedly entering and returning multiple times Here's a look at the test code: >>> def gen_example (): ... print ' before any yield ' ... yield ' first yield ' ... print ' between yields ' ... yield ' sec Ond yield ' ... print ' no yield anymore ' ... >>> gen = gen_example () >>> Gen.next () # First Call Nextbefore any Yield

;> counter = count_iterator () >>> Next (counter) 0>>> Next (counter) 1>>> next ( Counter) 2>>> Next (counter) 3>>> list (counter) # This would result in an infinite loop! Finally, we will modify the above program: If an object does not have a __iter__ method but defines the __getitem__ method, the object is still iterative. In this case, when the Python built-in function Iter will return an iterator type corresponding to this object, and use the __getitem__ method to traverse all elements of t

A simple and pure PHP paging class His features: simple, accept parameters, and give pages; flexibility: you can decide the name of the top or Next page (for example, prev, nex t, and so on) you can determine the number of pages displayed on each page. a packaging method is provided to adapt to different webpage structures. for example, if a webpage contains (1 ...), And so on. note: There are two static methods in the demo code t

. Other classes can do things that can be done by defining the exception class. However, the exception class is always designed to be very simple, and they provide properties that can be easily extracted from error handling. When designing a module to handle multiple exceptions, it is often necessary to define a basic class, and other classes to deal with some special cases on this basis. class Error (Exception): "" "," "" "" "" "" " Pass Class Inputerror (Error): "" "Exception raised for

; (retained) host jingli {Hardware Ethernet00: 0c: 29: 63: ac: 1c; (host max) Fixed-address192.168.1.11 (retained ip )}} vpn-pptp installation: Rpm-ivh pptpd-1.3.4-2.el6.i686 # I/etc/sysctl. conf: nex. listen 4_forward = 1 # I/etc/pptpd. confLocalip 192.168.1.1 (Internet) Remoteip 192.168.0.12-123 (intranet) # vi/etc/ppp/chap-secertAaa (User) pptp 123 (password) * (select one of all) /192.168.0.23 (retained)/etc/init. d/pptpd restart attachment: add N

)) # Generator Expression In fact, writing a list resolution, at least on the basis of a function, is basically equivalent to including a generator expression in a list built-in call to force it to generate all the results in the list at once.>>> List (x * * 2 for X in range (4)) [0, 1, 4, 9]However, the generator expression is quite different from the execution process: instead of building the result in memory, it returns a generator object that will support the iterative protocol and operate i

in the default configuration. add this directory in case it does not already exist. e.g.: [root @ localhost root] # mkdir/usr /Share/empty/mkdir: cannot create directory '/usr/share/empty': File exists 2c) For anonymous FTP, you will need the user "ftp" to exist, and have a valid home directory (which is NOT owned or writable by the user "ftp ". the following commands cocould be used to set up the user "ftp" if you do not have one: [root @ localhost root] # mkdir/var/ftp/[root @ localhost root]

the Ethernet[Email protected] etc]# tcpdump-i eth0-nex-s 12810. View file location by port number[Email protected] root]# pstree-p|-oracle (9826)|-PROFTPD (22884)|-SSHD (23627)---bash (23640)Then, go to/proc/22884, view the CmdLine file or want the relevant output to see maps[email protected] 22884]# cat maps08048000-08092000 R-xp 00000000 08:06 147482/usr/local/proftp/sbin/proftpd08092000-0809d000 rw-p 00049000 08:06 147482/usr/local/proftp/sbin/pro

pools ), your process holds shared pool latches for the entire dump duration so this shocould be used only as a last resort in busy production instances. dumping a big shared pool cocould hang your instance for quite some time. dumping private process heaps is safer as that way only the target process is affected. The heapdump output file structure is actually very simple, all you need to look at is the heap dump header to see in which heap the following chunks of memory belong (as there may be

This article is about the PHP implementation of the list of reverse order, has a certain reference value, now share to everyone, the need for friends can refer to the Output Result:List of links before reverse order:Node object ([str] = [Next] + + Node object ([str] = + 000000000000000 [Next] + = node object ([str] = 11 1111111111 [Next] = node object ([str] + 222222222222222 [Next] + + Node object ([str] + 333333333333 [NEX T] = + Node object ([s

PHP implements the lexicographic sorting algorithm .? Phpif ($ _ POST [perdata]) {$ _ POST [perdata] 1234;} $ datachop (trim ($ _ POST [perdata]); $ aexplode (, $ data); sort ($ a); $ dataimplode (, $ );?? Phpfunctionnex If ($ _ POST ["perdata"] = "") { $ _ POST ["perdata"] = "1 2 3 4 "; } $ Data = chop (trim ($ _ POST ["perdata"]); $ A = explode ("", $ data ); Sort ($ ); $ Data = implode ("", $ ); ?> Function nextpermu ( $ c) { $ S = sizeof ($ c ); $ I = $ s-1; While ($ I> 0) { If ($ c [$ I]>

] UHU-Linux [/td] [td] 14 [/td] [/tr] [tr] [td] 179 [/td] [td] Kiwi [/td] [td] 14 [/td] [/tr] [tr] [td] 180 [/td] [td] grml [/td] [td] 14 [/td] [/tr] [tr] [td] 181 [/td] [td] Xfld [/td] [td] 13 [/td] [/tr] [tr] [td] 182 [/td] [td] trixbox [/td] [td] 13 [/td] [/tr] [tr] [td] 183 [/td] [td] STD [/td] [td] 13 [/td] [/tr] [tr] [td] 18 4 [/td] [td] SharkOS [/td] [td] 13 [/td] [/tr] [tr] [td] 185 [/td] [td] Olive [/td] [td] 13 [/td] [/tr] [tr] [td] 186 [/td] [td] OliveBSD [/td] [td] 13 [/td] [/tr] [tr

Compared to the maximum flow template: Maximum flow template (Dinic)Paste the minimum fee flow template:const int OO=1E9;CONST int Mm=11111111;const int mn=888888;int node,src,dest,edge;int ver[mm],flow[mm],cost[mm],nex[ Mm];int head[mn],dis[mn],p[mn],q[mn],vis[mn];/** These variables are basically the same as the maximum flow, which increases the cost for the edge, and P records the opposite side of the node on the feasible stream */void prepare (int

head:ListNode:rtype:void does not return anything, modify head in-place instead. """ if notHeadreturn # splitFast = Slow = Head whileFast andFast.next:slow = Slow.next Fast = Fast.next.next Head1, head2 = head, Slow.next slow. Next =None # ReverseCur, pre = head2,None whileCur:nex = Cur.next Cur.next = Pre Pre = cur cur = NEX# MergeCur1, CUR2 = Head1, pre whileCur2:nex1, nex2 = Cur1.next, Cur2.next cur1.next = cur2 Cur2.

Scapegoat Tree template question.We found that the primitive cannot compare size.Use the balance tree to assign a value to each formula to compare the size. Each node in the tree has a l,r value of l+r. The left node is l,mid and the right node is the same. So the allocation value can obviously compare size.But the balance tree cannot be rotated, so use the scapegoat tree.Siz to be modified in several places. It's been tuned for a long time.#include #include#include#include#include#include#defin

: ' Ruff '}; look below, is Cookie-parser's main function Cookiepaser. exports = Module.exports = function Cookieparser (secret, options) { return function Cookieparser (req, res, NEX T) {//gets Req,res object if (req.cookies) return next () from the request, //if there is already a cookie object, exit the middleware to continue running var cookies = Req.headers.cookie; Take cookie Req.secret from headers = secret; //If there is an incomi