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SRM 451 div1 (Practice)

250pt: 1234+ 12340+ 123400+ 1234000+ 12340000+ 123400000+ 1234000000------------ 1371110974 The magic source of a number is the smallest positive integer x, satisfying sigma (x * 10 ^ I) [I = 0 ~ N] = this number. As mentioned above, 1234 is called the magic source of 1371110974, which is actually X * (1111111) = this number. The minimum X is the maximum 1111... 111. 500pt: For 50 points in the grid, the grid size is 10000. You can go through a few points

Information security -2:python Hill cipher algorithm [original]

Forwarding Annotated Source: http://www.cnblogs.com/0zcl/p/6106513.htmlObjective:Hill cipher Algorithm I intend to introduce briefly, the encryption matrix I use the textbook 3*3 matrix, only do the encryption, decryption did not do, but I think will be encrypted will be decrypted ~ ~First, Hill algorithm principleHill Password is a multi-letter replacement password, developed by Mathematics Leste Hill in 1929. The cipher algorithm takes m consecutive plaintext letters and replaces them with M-l

"Notes" NetEase Micro Professional-web security Engineer -03.web Safety Tools

requests. Learn to view, modify, delete, and add to cookies.Proxy Switcher: Agent tool, combined with the following introduction of the capture kit used. 2. Agent Grab BagA. Agent principle: Like an "intermediary", when the client has the data requirements of the Internet, Proxy will help users to the destination to obtain the data required by the user, responsible for intercepting, releasing, discarding requests and responses.B. Ability to configure browser proxies (native configuration method

[Original] Those years of the Linux common commands, simple and clear

cvs history -ca | grep username | grep kp | grep 2012-10-‘[1 2][0-9]‘ Antant-arguments [Target1,target2,target3,target4 ...]Ant build files are able to compile, package, and test the project. If you do not specify any parameters, ant will retrieve the Build.xml file in the current directory, run the file if it is found, and if it does not, you will be prompted not to find the relevant Build.xml file. ant -h, which indicates that the

[Original] Those years of the Linux common commands, simple and clear

Cvs cvs history -ca | grep username | grep 01-01 cvs history -ca | grep username | grep kp | grep 2012-10-‘[1 2][0-9]‘ Antant-arguments [Target1,target2,target3,target4 ...]Ant build files are able to compile, package, and test the project. If you do not specify any parameters, ant will retrieve the Build.xml file in the current directory, run the file if it is found, and if it does not, you will be prompted not to find the rel

Python3 Drawing Library Matplotlib (02)

Hexagon Marker H Rotated hexagon Marker + Plus Marker X Cross Marker D Diamond Marker D Thin Diamond Marker | Vertical Line _ Horizontal line Use keyword parameters for better control of ticks label values for x and y plotting type histogram chart = Histogram Chartserror Bar Chartsbar Charts This summary code example Import Matplotlib.pyplot as Pltim

Matplotlib for Python Developers

contains a format string for each pair of X, Y arguments in the form of:Plt.plot (X, Y, ' Plot can be specified by a third string parameter, Colors,line styles,marker styles The color of the line, The style of the line, The style of marker You can use string format to represent all the style individually or in combination In [3]: y = Np.arange (1, 3, 0.3)In [4]: Plt.plot (y, ' cx--', y+1, ' Mo: ', y+2, ' kp-. '); For example, the first lin

Springmvc encrypting a form using the RSA algorithm

js file, and add a Bcprov-jdk16-1.45.jar package2. Front-end 3. Server@RequestMapping (value= "/login", method=requestmethod.get) PublicString Login (Model model,httpservletrequest request)throwsexception{KeyPair KP=Rsautil.generatekeypair (); Rsapublickey PUBK= (Rsapublickey) kp.getpublic ();//generate public KeyRsaprivatekey prik= (Rsaprivatekey) kp.getprivate ();//Generate private keyString publickeyexponent = Pubk.getpublicexponent (). toStrin

C Language Programming CGI program (bottom)

=0241514913sce=0-12-12rf=2-9 "height=" 187 "width=" 448 "alt=" dCYlr042KgAA Ek=1kp=1pt=0bo=wag7aaaaa "/>Compile the program to generate CGI files650) this.width=650; "Src=" http://b148.photo.store.qq.com/psb?/5d11cec8-02fc-41d1-820a-68ed5b627c57/ hhrhl5qn.qrkh3yderodevi.dfqr3w5kp8ax2iwbdr4%21/b/dbtxrfjjdaaaek=1kp=1pt=0bo= Oqjsaaaaaaafaeo%21su=03353153sce=0-12-12rf=2-9 "height=" "width=" 569 "alt=" dBTXRFjjDAAAek=1 kp=1pt=0bo=oqjsaaaaa "/>4. Click the

The longest palindrome substring template---manacher algorithm. Time complexity O (N)

1#include 2#include 3#include 4#include 5#include string.h>6 using namespacestd;7 8 #defineN 100010009 intN;Ten intP[n]; One CharS[n], str[n]; A - #define_min (x, y) ((x) - the voidKP () - { - inti; - intMX =0; + intID =0; - for(I=n; str[i]!=0; i++) +Str[i] =0;//There is no problem with this sentence. Can not live ural1297, such as data: Ababa ABA A for(i=1; i) at { - if(MX >i) -P[i] = _min (p[2*id-i], p[id]+id-i); - Else -P[i] =1; - for(; st

0/1 knapsack problem by dynamic programming method to solve--java realization

), new Knapsack (3,20), New Knapsack (1, 8)};int totalweight = 12; Knapsackproblem KP = new Knapsackproblem (bags, totalweight); Kp.solve (); System.out.println ("--------The solution of the knapsack problem example:---------"); SYSTEM.OUT.PRINTLN ("Optimal value:" + kp.getbestvalue ()); SYSTEM.OUT.PRINTLN ("Optimal solution" selected backpack ":"); System.out.println (Kp.getbestsolution ()); System.out.println ("Best Value Matrix:"); int[][] bestvalu

PHP File goto base64

/spl4iv9ovtyywie2amr2zdnjsed7xkbbomcehtzv6/ G0fxbzzr3ogmf31rlaadgcg7vlhi9uv5lmef+gs2xeexzy2dxwx/7rle18Viadluvq9evuw9rlf8aeup9td46g5zqqnmtgtj8kmoxj7avtul6j3o1kutdraetu7p+lzwp2gv2oi01htnq0nsde+ Dxwwzdb8fatqm7sfe2q6hb/wahxutugifujnqnix82bjmn/pva8x+j3hvqrhqf7l8ga4rzaj4vstn8reewszpf0+kp/wae+ T2tr5qalpeq95cqc2pjnx1r+zs40ght9qax1ls9p1fw9dd7guvoxcnfhop9om7scvbk3fusfl9zj0r4w/ab/wcczhwt+l+q3/jj4enqhhlxkit +o6vof9dajj5a/wbbsrs2mqa2sbuan7mzzfmyaskfar8k4o8ezzysvhh

Introduction to the principle of ECC encryption algorithm

parallel intersection of R. We stipulate p+q=r. ()The law is detailed:▲ Here the + is not the ordinary addition of the real number, but the addition from the ordinary addition, he has some ordinary addition of some properties, but the specific algorithm is obviously different from ordinary addition.▲ According to this law, you can know that the elliptic curve Infinity Point o∞ and the elliptic curve point P's connection to P ', over P ' as the parallel line of the Y axis in P, so there is an in

Java--Simple RSA algorithm encryption and decryption

Encryption protocolpublic class Rsa_asc {/** specifies that the encryption algorithm is Desede */private static String algorithm = "RSA";/** Specify the size of key */private static int KEYSIZE = 1024;/** Specify the public key to store the file */private static String Public_key_file = "qhtec2017123";/** Specify the private key to store the file */private static String Private_key_file = "qhtec2017_java_08";/*** Generate key Pair*/private static void Generatekeypair () throws Exception {The/**

PHP encryption and decryption class implementation code

($key)) { return null; } $this->key= $key; } Public Function Getkey () { return $this->key; } Downloads by http://www.veryhuo.com } $string = "http://www.52blogger.com"; $crypt = new Crypt (); $crypt->setkey ("http://www.52blogger.com"); $enc _text = $crypt->encrypt ($string, $crypt->getkey ()); $dec _text = $crypt->decrypt ($enc _text, $crypt->getkey ()); echo Before encryption: $string n "; echo after encryption: $enc _text n "; echo "After decryption: $dec _text n"; ?>

RSA encryption Algorithm Java Simple implementation method (must SEE) _java

Simple and complete code, through which you will have a preliminary understanding of the RSA encryption algorithm in Java implementation method, this class, you can directly use, the level of high, on their own modified to improve the code. Package security; Import java.security.*; Import java.security.spec.*; Import java.security.interfaces.*; Import javax.crypto.spec.*; Import javax.crypto.interfaces.*; Import java.io.*; Import java.math.*; public class Rsademo {public Rsademo () {} publ

JS capture keyboard events and keys Key values method _javascript tips

KeyCode (s keycode) = t T keycode = u u keycode = v v keycode r = w keycode) = x x k Eycode (Y-y keycode) = Z Z keycode = kp_0 kp_0 keycode, kp_1 kp_1 keycode = kp_2 kp_2 keycode 9 9 = kp_3 KeyCode = kp_4 kp_4 keycode kp_3 = kp_5 kp_5 keycode 102 = kp_6 kp_6 keycode-kp_7 kp_7 Kp_8 keycode kp_9 kp_9 keycode kp_8 = kp_multiply kp_multiply keycode = Kp_add Kp_add keycode 108 = Kp_separator Kp_separator KeyCode 109 = kp_subtract kp_subtract keycode, kp_decimal kp_decimal, keycode =

Fast Power | | Take the remainder operation (divide and conquer the algorithm)

#include using namespace Std;Long b,p,k;Long skt=1;int WE,TSM;int KSM (long b,long p,long k){while (p){if (p%2!=0){The reason why skt=skt*b%k;//is not p=p-1 is because of the bit arithmetic in the backp=p>>1, the equivalent of P=P/2, the extra 1 is automatically eliminated, so p=p-1 can write not write}b=b*b%k;//re-initialized, the new formula is(b*b mod k) p/2 mod kp=p>>1;//equivalent to P=P/2, when p=1 p displacement is 0}return skt%k;}int main (){c

Two interesting probability problems

First consider question 1:From the natural number 1,2....N choose m not to repeat the number, which is the maximum expected?Assuming that the maximum value of a single test is K, thenP (k) =c (k−1m−1) C (MN)E (Max) =∑K=MNP (k) K=∑K=MNMC (MK) C (MN)Because ∑K=MNC (MK) =c (m+1n+1)E (Max) =MC (m+1n+1) C (MN) =m (n+1)/(m+1)First give the Python code to simulate the validation: def simulation_notrepeat (n,m): tot_average = 0 for i in range (10000): max = 0 count = 0 i

Linux Kernel kprobes Debugging technology __linux

) struct JPROBE structureThis structure is used when registering the Jprobe probe point, which contains two members:struct Kprobe kp;//This is jprobe an embedded struct kprobe structure member, because Jprobe is implemented based on Kprobe.kprobe_opcode_t *entry;//This is the proxy function of the probed function. 2) Setjmp_pre_handler () functionThe function acts as a pre_handler of the jprobe embedded kprobe, which is invoked first when the probe po

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