;Carmen eats the second litter she receives, extending her life from 10 hours to 13 hours;Carmen piled up a 3rd litter, height=19;Carmen piled up a 4th litter, height=20.Category labelsTags Click here to expandNo labelAC code + Explanation:/*first, according to the time of garbage disposal; F[i] indicates that the heap of garbage height is the longest time to live in Carmen, and each time the judging condition is whether the time to survive is greater than the time of the garbage, if not Carmen
"// The x in foo is accessed only because of the closure.Alert ('Call to f (): '+ f (); // "2"Javascript closure traps and CasesIn many cases, because the internal function variables overwrite the closure variables, if we need to reference a variable with the same name as an external function, we need to execute an anonymous function, variables without external functions are passed in as parameters. As follows:(Function (out_xxx ){// You can use out_x
The computer reports millions of lattice traps inside the story. The purpose of this article is not to belittle the major subnets, but to waste your valuable promotional money on the webmasters.When money is used in appropriate places, such as Google, Baidu, and exchange links, the author will definitely keep a fair comment to write.Let's briefly introduce the million-dollar grid: milliondollarhomepage.com, a 21-year-old English student named Alex.I d
In recent projects, we have encountered some "inexplicable" errors caused by uncoding (transcoding) When URL parameters are passed, so as to avoid detours like me.
We know that a web project always has to pass parameters like a http://www.google.cn/search? Hl = ZH-CN Q = % E5 % 95% 8A, which includes two parameters, HL and Q, and Q is encoded ("ah" in Chinese "). But in projects, when we pass parameters, we forget to encode (decode, transcode) the parameters. What kind of
has only one parameter. The value of this parameter is the value of the comma operator in parentheses.
Note: In C, the order in which all other operators evaluate their operands is undefined. In particular, the value assignment operator does not guarantee any order of value. If you use the same variable for multiple times in an expression, the Operation consequences such as ++ or -- are sometimes unpredictable. For example:
Y [I] = x [I ++];
9. The result of a logical operator is a logical val
This is the first summer vacation of the university. I want to study hard this summer and review the knowledge of the previous two semesters. Therefore, I decided to read "C traps and defects" again. this is indeed a very good book. I think it is one of the books that students must read. The following are my reading notes that will be constantly updated, I hope it will be helpful for learning C.
Chapter 1
1.It doesn't make sense to isolate a single
of images in a lightbox window. You should never use the following code.
Here we use jQuery as an example.
HTML:
.......
Javascript (not recommended ):
$ ('A'). on ('click', function (){
CallLightbox (this );
});
This will cause binding events to every link element. It is best to bind events to the specified image container, as shown below:
$ ("# Grid-container"). on ("click", "a", function (event ){
CallLightbox(event.tar get );
});
Online debugging
Avoid redundancy comp
MySQL database is an open source database based on structured data. SQL statements are the core language of MySQL databases. However, when executing SQL statements in the MySQL database, you need to be careful with two traps.
Trap 1: NULL values are not necessarily empty
A null value is a special field. In MySQL databases, null values often have different meanings under different circumstances. This is a feature of the MySQL database. For example, in
Vue better-scroll rolling plug-in traps, vuebetter-scroll
BetterScroll claims to be the best Mobile-side rolling plug-in currently, so its strength must exist. Or... haha. My personal feeling is still very useful. This article is not about BetterScroll in general, but about rolling. To learn more about it, please move here.
Rolling Principle
What is better-scroll?Rolling Principle
Better-scroll is a plug-in that focuses on mobile terminals (PCs alrea
Traps of Parallel Streams in Java 8 [translation], java8streams
: Simplified text and free text links: Java Parallel Streams Are Bad for Your Health!Java 8 provides three important functions that we desire: Lambdas, Stream API, and default Interface methods. However, we can easily abuse them and even destroy our own code.Today, let's take a look at Stream APIs, especially parallel streams. This article outlines the traps.But first let's take a look at
BigDecimal precise calculation and traps
BigDecimal is usually used when accurate computation is involved. The following is a summary of the incorrect use of BigDecimal.
Conclusion: Initialize the BigDecimal variable:
// BigDecimal initialize public static void testBigDecimalinit () {BigDecimal num1 = new BigDecimal (0.1); System. out. println ("Pit Point 1: num1 =" + num1); // pit Point 1: num1 = 0.1000000000000000055511151231257827021181583404541015
Trigger creation traps
The creation of Oracle triggers differs from the creation of stored procedures, functions, and packages.
Trap 1:
The current schema is inconsistent with the trigger owner.
For example:
The current login schema is R5_T150, and then execute the following create trigger:
create or replace trigger "R5_T135".TRI_forbidden_01 before update or delete of GOODSCODE on t_goodsbegin RAISE_APPLICATION_ERROR(-20002, 'forbidden opera
I2C bus learning-check for missing traps-S3C2440 I2C Controller
After learning the theoretical part of the IIC bus protocol, I think we should learn how to operate the 2440 IIC controller. After all, it is all about learning the S3C2440, so I will add this part. The I2C interface of S3C2440 can work in four modes: Host transmitter, host receiver, slave transmitter, and slave receiver. Shows its internal structure.
We can see that the S3C2440 provid
types and value types frequently to avoid falling into the performance trap.
3. Use of null merge operators.
The null merge operator is introduced in C #2.0. First ?? Second:
(1) Evaluate first.
(2) If first is not null, the value of the entire expression is the value of first.
(3) Otherwise, calculate the value of second as the value of the entire expression.
Sample Code 1: when the first parameter is not null, the value of the entire expression is the first parameter no matter whether the sec
20140508
1. SQL statement, splicing query, adding single quotation marks for the string type, using =, and directly assigning values for the integer type
// Method 1
String SQL = "select ID, name from table_temp where name = 'host' Limit 30 offset 20 ";
DB. rawquery (SQL, null );
// Method 2 can I say it is not verified?
String SQL = "select ID, name from table_temp where name =? Limit? Offset? "
DB. rawquery (SQL, new string [] {name_value, limit_value, offset_value });
2. fuzzy query, using
Question: Click to open the link
Find the duplicate number. The first reaction is map (which they use for hash), which is easy to write (I am a pointer to the weak slag). However, some traps have been found during actual application, leading to several wa.
The principle is very simple: Create a table, convert it to a number, ignore the horizontal bar, add it to the map, and automatically open the memory ++ according to the features automatically manag
First of all, it should be noted that I am not a theoretical school and seldom try to read out-of-class books. I just need to find them when I use them. Therefore, there are deficiencies in theory, leading to insufficient understanding of the "traps" in this article. Of course, for some friends with strong professional knowledge, this is not a "trap", but for my current knowledge level.
Let's give an example to better illustrate the situation. Assume
traditional industry in the accumulation of original capital has been preliminarily completed, the Internet circle, The big one in addition to Alibaba is mostly relying on entertainment, of course, Google and Baidu can be counted as a link in the SMB market, and nothing more. Entrepreneurial class is basically barefoot, like me just looking around for shoes, I am afraid of the opportunity and the Bille of the trap is the latter account for the bulk.
Asymmetric information, is an opportunity, bu
in a sequential container will invalidate the iterator pointing to this element and subsequent elements.I summarized it and thought back to the code I modified at the time, so the correct method should be as follows:1. For node-type containersSTD: List ...STD: List For (; iter! = MList. End ();){If (...){// Because the node type will only cause the current node iterator to become invalid, the iterator will be moved back when the node is deleted, because other elements will not become invalid.ML
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