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Maintain real-time median and rank

); } } Else { if(maxheap.size () = = 0) {maxheap.offer (num); } Else { if(Num >Minheap.peek ()) {Maxheap.offer (Minheap.poll ()); Minheap.offer (num); } Else{maxheap.offer (num); } } } } //Returns The median of the current data stream Public DoubleFindmedian () {if(maxheap.size () = = 0) return-1; if(maxheap.size () = =minheap.size ()) { return(Double) (Maxheap.peek () + Minheap.p

Oracle's Row_number () over, rank () over and Dense_rank () over three analytic functions (RPM)

Tags: nbsp Search rank Technology share according to picture Oracl des SeleSuppose there is a student table student, the student table has a name, a score, a course number, and now I need to sort the students ' grades according to the course.SELECT * FROM Student1. Rank over () can be achieved on the student rankings, characterized by the same results as two are tied, as follows 1 2 2 4 5Select Name,CourseR

Oracle Development Analysis Function (Rank, Dense_rank, Row_number) _oracle

First, use rownum for record ranking: In the previous "Introduction to Oracle Development analysis function over", we understand the basic application of analytic function, now we consider the following questions: ① to rank all customers by total order② rank by region and customer order totals③ find the top 13 customers in order total④ find customers with the highest and lowest order totals⑤ find the top

Two optimizations for query set: merge by rank and compression by path to optimize merge path compression

Two optimizations for query set: merge by rank and compression by path to optimize merge path compression The query set has two optimizations. I. merge by rank Description: it is connected to two different subsets according to rank, that is, the low rank is connected to the high ra

Evaluation Indicators of learning to rank for IR-map, ndcg, MRR

Map (mean average precision): the average accuracy of a single topic is the average accuracy of each document after retrieval. The average accuracy (MAP) of the master set is the average accuracy of each topic. Map is a single-value indicator that reflects the system performance in all relevant documents. The more documents the system retrieves (the higher the rank), the higher the map. If the system does not return relevant documents, the accuracy is

Preparation of hadoop (I): A Preliminary Study of the Page Rank Algorithm

Why did we put page rank in the hadoop study notes? This is because the first week of the hadoop course focused on Google's three major papers (GFS, map-Reduce and Big Table) and the source of hadoop ideas, PR in the solutions of Page Rank and map-ReduceAlgorithmThe idea of how to use distributed computing to process the Page Rank of trillions of webpages has not

[ACM] HDU 5131 Song Jiang & #39; s rank list (simulation ),

[ACM] HDU 5131 Song Jiang's rank list (simulation ),Song Jiang's rank list Time Limit: 2000/1000 MS (Java/Others) Memory Limit: 512000/512000 K (Java/Others)Total Submission (s): 36 Accepted Submission (s): 18Problem Description Shui Hu Zhuan, also Water Margin was written by Shi nai' an -- an writer of Yuan and Ming dynasty. shui Hu Zhuan is one of the Four Great Classical Novels of Chinese literature. it

A detailed analysis of the R language rank function

What is the 1.rank functionRank related document [1] can be translated as "return the original array (?) sort (?) for each element in the After the rank (?)", on the surface can really get the order, but the array, sorting, rank is not clear.2.rank function Usage ScenariosFor example, in the 100-meter race, the results

oracle--(rank) ranking function

Label: Content from: Oracle®database SQL Language Reference 11g Release 2 (11.2) e41084-03. The Empolyees table is from the HR scenario. The rank function calculates the position of a value in a particular sort (using the aggregation syntax) and calculates the rank by the value of the specified column (using statistical syntax). train map for aggregation syntax : The following statement calc

1012. The best rank (25) -- Pat (Advanced Level) practise

Question information: 1012. The best rank (25) Time Limit 400 MS The memory limit is 32000 kb. Code length limit: 16000 B Criterion author Chen, Yue To evaluate the performance of our first year CS majored students, we consider their grades of three courses only: C-C programming language, M-Mathematics (calculus or linear algebra ), and e-English. at the mean time, we encourage students by emphasizing on their best ranks -- that is, among the four r

Sort Oracle groups by rank

A Data grouping report was created several days ago and then re-ordered. It is written in crystal script. First, set a global variable to auto-add it, And then clear it in each group head. The code is very simple and I will not post it.After a short time, a colleague sought a grouping and then re-ordered the statement. He thought that my report was made using a similar SQL statement. In fact, if Oracle is used, the rank function can also implement gro

The usage of the partition function partition by and row_number () and the use of rank () are explained in detail (get the first few records in the Grouping (partition))

Reprint Address: http://www.cnblogs.com/linJie1930906722/p/6036053.htmlThe partition by keyword is part of the analytic function, which differs from the aggregation function in that it can return multiple records in a group, whereas aggregate functions generally have only one record that reflects the statistical value, and partition by is used to group the result set. If not specified then it takes the entire result set as a grouping, and the partition function is generally used with the

How to perform two sets of independent sample rank and test in R language

Install the required packageswants A sample testset.seed(123)medH0 [1] 15(pGreater [1] 0.02069(pTwoSided [1] 0.04139Wilcoxon Row InspectionIQ wilcox.test(IQ, alternative="greater", mu=medH0, conf.int=TRUE) Wilcoxon signed Rank test Data:iq V = , p-value = 0.01855 Alternative hypothesis: true location is greater than percent Confidence interval: 113.5 Inf Sample estimates: (pseudo) Median 121

Thinking and summarizing of Oracle's rank and column transformation __oracle

s.subjectname= ' math ' then S.subjectscore else 0 end) as mathematical results,SUM (case when s.subjectname= ' English ' then S.subjectscore else 0 end) as English scoreFrom student SGROUP BY S.stunameORDER BY S.stuname Results obtained after implementation: The above practice is also very easy to understand, here is not much to say, but the above is also limited. Because there are some fixed values here. such as "Chinese, maths," in the case. "But when you meet a small business need, you can

Matrix of rank 1, vector, combined use of merit

A matrix of rank 1 has been specifically discussed, with n-1 linear independent vectors from ax=0 Ax = 0, Lenovo to: Aα=0⋅αa\alpha = 0\cdot \alpha, knowing that 0 must be a eigenvalues of a, and n-1-valued eigenvalues. Such a nature, if examined alone, is too simple. In another article, we summarize the idea that the matrix of rank 1 is exponentiation. http://blog.csdn.net/u011240016/article/details/5280566

Song Jiang ' s rank list

Song Jiang ' s rank listTime limit:2000/1000 MS (java/others) Memory limit:512000/512000 K (java/others)Total submission (s): Accepted submission (s): 8Problem Description "Shui Hu Zhuan", also "water Margin" was written by Shi Nai's--an writer of Yuan and Ming dynasty. "Shui Hu Zhuan" is one of the four great classical novels of Chinese literature. It tells a story about 108 outlaws. They came from different backgrounds (including scholars, fishermen

HDU 5131 Song Jiang ' s rank list

Topic Connectionhttp://acm.hdu.edu.cn/showproblem.php?pid=5131Song Jiang ' s rank listdescription"Shui Hu Zhuan", also "water Margin" was written by Shi Nai's "an"-an writer of Yuan and Ming dynasty. "Shui Hu Zhuan" is one of the four great classical novels of Chinese literature. It tells a story about 108 outlaws. They came from different backgrounds (including scholars, fishermen, Imperial drill instructors etc.), and all of them eve Ntually came to

HDU 5131 Song Jiang ' s rank list (water problem)

Song Jiang ' s rank listTime limit:2000/1000 MS (java/others) Memory limit:512000/512000 K (java/others)Total submission (s): 253 Accepted Submission (s): 128Problem Description "Shui Hu Zhuan", also "water Margin" was written by Shi Nai's--an writer of Yuan and Ming dynasty. "Shui Hu Zhuan" is one of the four great classical novels of Chinese literature. It tells a story about 108 outlaws. They came from different backgrounds (including scholars, f

How to write a group rank in a step

1. For example, there are two classes, four people, 2 students per class, 2 genius2. Use the Row_number () function to rank two classes, such as3. Find out the top three students of each class, just use the rank, observed rank is everyone in their class position, so in the outside package a layer in the condition of query on it can beAttach the SQL statement: wit

SQL limit T and rank over

1. How to Select 200th to 300th records from the table Select top 300 * from table Except Select top 200 * from table 2. A table records the student's score a (studentname, grade) in a certain subject. The table is sorted by score and the column "rank" is added )". How to Write a query statement? Select a. Name, A. grade, Rank () over (order by grade DESC) rank

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