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for us to transparently process the container forward or backward with an algorithm. For example, you can sort vectors into descending order by passing a pair of reverse iterators to sort:Sort (Vec.begin (), Vec.end ()); Sort (Vec.rbegin (), Vec.rend ());1#include 2#include 3#include 4#include 5 using namespacestd;6 7 voidPrintintelem)8 {9cout ' ';Ten } One A intMain () - { -dequeint>Coll; the for(inti =1; I 9; ++i) - Coll.push_back (i); - -dequeint>:: iterator pos1; +POS1 = Find (Coll.b

use. This is used in the or character "(|)" is useful to combine parts of a pattern. For example, "Industr (?: y|ies)" is a more abbreviated expression than "industry|industries". 　　 The (? =pattern) non-fetch match, positive pre-check, matches the lookup string at the beginning of any string that matches the pattern, and the match does not need to be fetched for later use. For example, "Windows (? =95|98| nt|2000) "Can match" windows "in" Windows2000 ", but does not match" windows "in" Windows

When creating a component, the data type is an array, and when the data in the array is deleted, the data in the array is correct, but the page renders no data.Example: (not necessarily reproducible)Cause: When setting V-for: Key uses index. The value of key is not the only cause.FIX:: key= "Item.id" is set to a unique valuePrinciple: Waiting to be mendedArray deletion in Vue, page not re-rendered

= "Wkiol1faun3qtugvaaayhsoav3k280.png"/>Shell Basic OperationsNative bash does not support simple arithmetic operations and can be done with other commands such as awk and expr.Arithmetic operations+ - * / % = == !=Var= ' Expr 3 \* 5 'Relational operators-eq-nq-gt-lt-ge-leRelational operators only support numbers, and strings are not supported650) this.width=650; "src=" Http://s3.51cto.com/wyfs02/M01/86/7D/wKiom1fAe73Q4X74AAAsv0btqaE109.png "title=" D.png " alt= "Wkiom1fae73q4x74aaasv0btqae109.p

--r--.1Root root139August - -:TenVara-rw-r--r--.1Root root134August - -: thevarrr-RW-------.1Root root602344August - the: GenevaYum_save_tx. .- ,-16.09- Geneva. K8wko4.yumtx(2> overwrite error output 2>> append error Output)> redirect standard output or error output to the same file, whether executed correctly or not[Email protected] tmp]#ls/tmp/>/tmp/Ccc1[[email protected] tmp]#Cat/tmp/ccc1 ccc1SSH-6xolw4llamwesystemd-private-30HjJisystemd-private-ch9s6xsystemd-private-Mnh52byum_save_tx. .-

.Note: When declaring a params array, the array must be at the last of the parameters because it will be packaged by default for all parameters that follow it.Similarly, you can use the params modifier in the SqlHelper method. If there are parameters, input parameters, no parameters, no input, equivalent to an array of length 0.use using ()After the database execution is complete, you need to execute Conn.close () and CMD. Dispose () operation. In the previous sqlhelper, the two lines of code we

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Vim in the SWP that Swap file, which is generated when editing a file, it is a hidden file, if the original file name is Data , then SWP file name is . DATA.SWP . If the file exits normally, the file is automatically deleted. The following two scenarios do not delete the SWP file: Vim non-normal exit , In this case , unless manually deleted SWP file (also available in Vim Delete When prompted), or it will persist. Multiple programs edit a file at the same time. You can disable

After the Hadoop namenode reformat, restart HBase, find its hmaster process to disappear immediately after the start, look at a lot of logs, and finally found the following problems in the zookeeper logUnable to read additional data from client SessionID 0x14e86607c850007, likely client have closed socketWorkaround: Delete the hdfs-site.xml of hbase in the directory under the configured path of the content, restart the zookeeper cluster, and then restart HBase so that the directory can be regene

#!/bin/SH# Usage:./resetusb ARGUMENT (the keyword for your USB device)Var1=$1keyword=${var1:=Storage}debug=$ (LSUSB) bus=$ (lsusb|grep$keyword |Perl-ne"/\d+ (\d+) \d+ (\d+) +/; print QQ (\$1)") Device=$ (lsusb|grep$keyword |Perl-ne"/\d+ (\d+) \d+ (\d+) +/; print QQ (\$2)")Echo "/ * Usbreset--Send a USB port reset to a USB device * /#include#include#include#include#include#includeintMainintargcChar**argv) {ConstChar*filename; intFD; intRC; if(ARGC! =2) {return1; } filename= argv[1]; FD=open (file

1. Inherit thread　　 Public class extends thread{ publicvoid run () { System.out.println () {Thread.CurrentThread (). GetName ()); } Public Static void Main (string[] args) { new testthread (); T.start (); }}2. Implement Runnable Public class Implements runnable{ @Override publicvoid run () { System.out.println ( Thread.CurrentThread (). GetName ()); } Public Static void Main (string[] args) { new Thread (new testrunna

for(i =0; i i) {intFD =EVENTS[I].DATA.FD; uint32_t revents=events[i].events; if(FD = = LISTENFD)//Processing Listen FD { if(Revents kreadrevent) { //Establish a connection intPEERFD = ACCEPT4 (LISTENFD, NULL, NULL, Sock_nonblock |sock_cloexec); if(PEERFD = =-1) Err_exit ("Accept4"); //New TCP connectiontcp_connection_t *pt = (tcp_connection_t*) malloc (sizeof(tcp_connection_t)); Buffer_init (pt->buffer_); //Place the TCP co

Concurrenthashmap.segmentfor algorithm, 3, 4 corresponds to the segment are segments[1],7 corresponding segment is segments[12].(1) Thread1 and Thread2 have entered the Segment.put method, Thread1 will first acquire to lock, can enter, and THREAD2 will block in the lock:(2) switch to THREAD3, also go to the Segment.put method, because 7 of the stored segment and 3, 4 is different, therefore, will not block in lock ():The above is the concurrenthashmap mechanism, by dividing the entire map into

Decimal conversion to binary: Using the reverse order method with the addition of twoBinary is converted to decimal: the power product corresponding to each binary number is used.Example: 110 = 1*2^2+1*2^1+0*2^0The conversion between hexadecimal and decimal is first converted to binary after converting to decimal. (Method: Trinity)The conversion between octal and decimal is first converted to binary after converting to decimal. (Method: Four-bit integrated)Hexadecimal:A = ten = 1010bB = one = 10

ignoredapktool-install-linux-r05-ibot/Apktool-install-linux-r05-ibot/apktool[Email protected]:~/Download $ ls-alTotal dosage 11740Drwxr-xr-x 4 Bixiaopeng Bixiaopeng 4096 October 12 10:42.Drwxr-xr-x Bixiaopeng Bixiaopeng 4096 October 12 10:38.Drwxrwxr-x 2 Bixiaopeng Bixiaopeng 4096 February 3 apktool1.5.2-RW-------1 Bixiaopeng bixiaopeng 2658304 October 10:37 Apktool1.5.2.tarDrwxrwxr-x 2 Bixiaopeng bixiaopeng 4096 December Apktool-install-linux-r05-ibot-rw-rw-r--1 Bixiaopeng bixiaopeng 419840 Oc

port in the system's firewall and add "2425 TCP Fjitsuappmgr" and "2425 UDP fjitsuappmgr".#yum Install g2ipmsgThree scripting Tools#yum Install expect#yum Install Xdotool#yum Install Xclipset up automatic login on bootvi/etc/gdm/custom.confAdd three sentences:[Daemon]timedlogindelay=5automaticloginenable=trueAUTOMATICLOGIN=XQLor:automaticloginenable=trueAUTOMATICLOGIN=XQLOpen the Password and encryption key (or enter Seahorse in the terminal) from the application, switch to the Password tab, se

make makes a mistake Workaround:/usr/include/asm /usr/include/linux /usr/include/generic directory is not configured correctly2:make to the last error information such as the following:make[3]: * * * No rules can be created "net/ipv4/netfilter/ipt_tos. o" desired target " net/ipv4/netfilter/ipt_tos.c". Stop it.make[2]: * * [Net/ipv4/netfilter] error 2make[1]: * * [Net/ipv4] error 2Make : * * * [NET] error 2...............Make[3]: * * * no rules can create "net/ipv4/netfilter/ipt_tos.o" requir

；而非公平锁是允许插队的。默认情况下ReentrantLock是通过非公平锁来进行同步的，包括synchronized关键字都是如此，因为这样性能会更好。Public Reentrantlock (Boolean Fair) //If this lock should use a fair sorting policy, this parameter is Trueimport Java.util.concurrent.locks.ReentrantLock; Public classFairlockImplementsrunnable{ Public StaticReentrantlock RL =NewReentrantlock (true);@Override Public void Run() { while(true){Try{RL.Lock(); System. out.println(Thread.CurrentThread().GetName()+": Get Lock"); }Catch(Exception e) { }finally{R

Let's consider a more complex scenario: the products are different. It is not enough to record only one quantity at this time, but also to record the details of each product. It is easy to think of the need to record these products in a container.A synchronized, thread-safe queue class is provided in the Python queue module, including FIFO (first-in, first-out) queue Queue,lifo (back-in-first-out) queue Lifoqueue, and priority queue priorityqueue. These queues implement the lock primitive and ca

With examples, it's a good idea.is to not allow shared variables to be executed by individual threads, resulting in unexpected resultsThe lock class is defined in the threading module, allowing for easy handling of locks:# Create a lockMutex = Threading. Lock ()# LockMutex.acquire ([timeout])# FreeMutex.release ()Where the lock method acquire can have a time-out optional parameter of timeout. If timeout is set, the return value after timeout can be used to determine if a lock has been obtained,