example: string, number, tuple), value (key) can be any data typeD1 = {' Alice ': ' 2341 ', 9102: ' Bibi ', (11,22): ' 3258 '} # CorrectD2 = {[' Alice ', 123]: ' 2341 ', True: ' 9102 ', {' abc ': ' 123 ', ' EFG ': ' 456 '}} # Error! Because the list Boolean dictionary is mutable, it cannot be used as a key3. The dictionary is unordered, and each time the print is executed, the order will change.D3 = {'
Transferred from: http://www.weixueyuan.net/view/6337.htmlThe C + + language inherits the struct and expands it. In C, a struct can define only data members, not member functions. In C + +, structs are similar to class, where you can define both a data member and a member function.In C + +, struct and class are basically generic, the only difference is that if you use the Class keyword, the member variables or member functions defined in the class are private properties by default, and the struc
the RSA algorithm. Suppose Alice wants to encrypt her communication with Bob, how should she generate the public and private keys?The first step is to randomly select two unequal prime numbers p and Q.Alice chose 61 and 53. (In practice, the larger the two prime numbers, the harder it is to crack.) )The second step is to calculate the product N of P and Q.Alice multiplied the 61 and the 53.
n = 61x53 = 3233
The length of n is the key le
2048 is a famous Single-player game in which the objective are to slide tiles on a grid to combine them and create a tile W ITH the number 2048.
2048 is played on a simple 4 x 4 grid with tiles This slide smoothly when a player moves them. For each movement, the player can choose to move all tiles in 4 directions, left, right, up, and down, as far as possible At the same time. If two tiles of the same number collide while moving, they would merge into a tile with the total value of the two til
Tags: common options text System user Repeat command group modify Linux usersBefore learning the user and group management commands, we first need to understand the ID of this basic command, it is to display the current user's identity information, the user will inevitably involve the concept of the group, then let us look at the relevant user and group commands.1. IdID Current user's own informationGrammarID option parameter (user name)Options and ParametersID User name Displays information for
the RSA algorithm. Suppose Alice wants to encrypt her communication with Bob, how should she generate the public and private keys?The first step is to randomly select two unequal prime numbers p and Q.Alice chose 61 and 53. (In practice, the larger the two prime numbers, the harder it is to crack.) )The second step is to calculate the product N of P and Q.Alice multiplied the 61 and the 53.
n = 61x53 = 3233
The length of n is the key le
LightOJ1020 (game)
Alice and Bob are playing a game with marbles; you may have played this game in childhood. The game is playing by alternating turns. In each turn a player can take exactly one or two marbles.
Both Alice and Bob know the number of marbles initially. now the game can be started by any one. but the winning condition depends on the player who starts it. if
The main topic: give you a n,m,k. n Rows, m columns. Then give you the sum of each line, with the sum of each column, so that you fill in this n*m matrix a number less than or equal to K, so as to satisfy each column, each row and. If there is no output "impossible", there is a multiple solution output "notunique", there is a unique solution output "unique", and output his solution.From the source point to each row and the build capacity for its sum, from the sink point to the Lie Jian edge capa
Click to open linkRedraw Beautiful DrawingsTime limit:3000/1500 MS (java/others) Memory limit:65536/65536 K (java/others)Total submission (s): 1660 Accepted Submission (s): 357Problem Descriptionalice and Bob are playing together. Alice was crazy about art and she had visited many museums around the world. She had a good memory and she can remember all drawings she had seen.Today Alice designs A game usin
, Python programmer Alice was going to create a class that represented money. Her first form of implementation is probably the following:
# The first version of the money class in dollar-based currencies: def __init__ (self, dollars, cents): self.dollars = Dollars self.cents = Cents # There are other ways we don't have to ignore
This class was later packaged into a Python library and slowly used by many different applications. For example,
Maximum Flow judgment multiple solutionsBuild diagram:The source point is connected to each of the row's node capacity for the row sum, each node that represents the column is connected to the sink capacity as a column sum, and the rows and columns are connected to each other with a limit of capacityMultiple solutions:After doing the ISAP, on the residual map DFS see whether the number of points greater than 2 can be foundRedraw Beautiful DrawingsTime limit:3000/1500 MS (java/others) Memory limi
Click to open linkRedraw Beautiful DrawingsTime limit:3000/1500 MS (java/others) Memory limit:65536/65536 K (java/others)Total submission (s): 1660 Accepted Submission (s): 357Problem Descriptionalice and Bob are playing together. Alice was crazy about art and she had visited many museums around the world. She had a good memory and she can remember all drawings she had seen.Today Alice designs A game usin
immediately respond to the caller (Alice) to stop the resend of the invite request.
The proxy server searches for the address of Bob in the location server. After obtaining the address, forward the invite request further.
After that, Bob's phone generated a 180 ringing (temporary response) back to Alice.
Bob picks up the phone and a quick response is generated.
Once the OK arrives
encryption is different from that of public key authentication. I will explain in detail the differences between the two.
Public Key-based encryption process
For example, two users Alice and Bob, Alice want to send a piece of plain text to Bob through the two-key encryption technology. Bob has a pair of public and private keys, the encryption and decryption process is as follows:
Bob transfers his public
available in terms of attack exploits:Type A, a locally exploited vulnerability that exists in the client script itself on the page。 The attack process is as follows: Alice sends Bob a maliciously constructed web URL. Bob clicks and looks at the URL. JavaScript in a malicious page opens a vulnerable HTML page and installs it on Bob's computer. The vulnerable HTML page contains javascript that executes on the local domain of Bob's computer. Alice's ma
Time Limit:10 Sec
Memory limit:128 MB
submit:72 solved:46
description Alice has a big chandelier at home. The so-called chandelier is made up of a lot of light bulbs. Only one bulb is hanging from the ceiling, and the rest of the bulbs are hanging on the other bulbs. In other words, the entire chandelier is actually similar to a tree. The lamp numbered 1 is hung on the ceiling, and the rest of the bulbs are hung on the lamp with a number
A Funny Game
Time Limit: 1000MS
Memory Limit: 65536K
Total Submissions: 5401
Accepted: 3381
DescriptionAlice and Bob decide to play a funny game. At the beginning of the game they pick N (1
Figure 1
Note: For n > 3, we use C1, c2, ..., cn to denote the coins clockwise and if Alice remove C2, then C1 and C3 is not adjace Nt! (Because there is a empty place between C1 and C3.)S
#1173: Game games · Nim Games • Three time limit: 10000ms single point time limit: 1000ms memory limit: 256MB descriptionIn this game Alice and Bob decided to add a rule to the original NIM game: Each action, not only the choice of a heap to take away any number of stones (at least 1, at most to take out the pile of all the remaining stones), you can also choose to divide a pile of stones into two piles, but do not take away stones. For example, there
function to calculate a particular piece of data, you will get a string of signatures, and is irreversible, this pattern is similar to "fingerprint" information, as long as the use of the same hash algorithm, no matter how many times the same data generated by the signature code is always the same, If the original data has changed, even if it is subtle, then the signature will also have a huge change, this phenomenon is called the avalanche effect. Therefore, the data integrity check can be ach
Redraw Beautiful DrawingsTime limit:3000/1500 MS (java/others) Memory limit:65536/65536 K (java/others)Total submission (s): 3813 Accepted Submission (s): 1140Problem DescriptionAlice and Bob are playing together. Alice was crazy about art and she had visited many museums around the world. She had a good memory and she can remember all drawings she had seen. Today Alice Designs a game using these drawings i
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