java - Using insertion sort to sort only part of array -


i'm writing quicksort program. part of quicksort involves using insertionsort, sorts range of elements, since quicksort handles rest. i'm trying emulate method provided textbook uses 

   public static void insertionsort(int a[], int left, int right)

but struggling figure out how left , right used. here insertionsort code without using parameters left , right:

public static void insertionsort(int a[], int left, int right) {     int j;     (int p = 1; p < a.length; p++) {         int tmp = a[p];         for(j = p; j > 0 && tmp < a[j - 1]; j--) {             a[j] = a[j-1];         }         a[j] = tmp;     } }

if add left , right parameters sort part of array, apply?

thanks help.

use left , right in loop declaration:

public static void insertionsort(int a[], int left, int right) {     int j;     (int p = left; p < right; p++) {         int tmp = a[p];         for(j = p; j > 0 && tmp < a[j - 1]; j--) {             a[j] = a[j-1];         }         a[j] = tmp;     } }

example input: insertionsort({3, 2, 6, 5, 8, 3, 6, 7, 0}, 2, 6)

example output: {3, 2, 3, 5, 6, 8, 6, 7, 0}

edit:

in above example, left inclusive , right exclusive. if want include right index, change p < right p<= right. keep in mind when calling method indexing starts @ 0.


Comments

Post a Comment

Popular posts from this blog

java - Spring Data JPA: Why findOne(id) executing delete query internally? -

i have 1 application using @manytomany annotation link 2 different entities 1 parent entity. not sure if have implemented properly. when execute .findone() on parent entity's repository find it, @ first fetch data along executing delete queries internally delete record mapping table (a table jpa creates after adding @manytomany annotation.). following generated sql queries , code snippet: java class @entity @table(name = "inventory") public class inventory { @id long id; // many other properties @manytomany(fetch=fetchtype.lazy) private list<stream> streams; @manytomany(fetch=fetchtype.lazy) private list<subject> subjects; } there no other annotation i've put in stream , subject entity class link inventory class. when run app, create following tables: inventory stream subject inventory_stream inventory_subject (inventory_stream , inventory_subject, 2 tables created automatically, don't k...
Read more

python - Mongodb How to add addtional information when aggregating? -

i beginner , wrote line pipeline works, wanna add other information output, screen name , or number of tweets.i tried add under $group gave me syntax error everytime here pipeline: def make_pipeline(): # complete aggregation pipeline pipeline = [ { '$match': { "user.statuses_count": {"$gt":99 }, "user.time_zone": "brasilia" } }, { "$group": { "_id": "$user.id", "followers": { "$max": "$user.followers_count" } } }, { "$sort": { "followers": -1 } }, { "$limit" : 1 } ]; i using on example : { "_id" : objectid("5304e2e3cc9e684aa98bef97"), "text" : "first week of school on :p", "in_reply_to_status_id" : null, "retweet_count" : null, ...
Read more

java - Incorrect order of records in M-M relationship in hibernate -

Image
i have 4 records in bridge table in mysql database. using @manytomany in hibernate, accurate order of employees incorrect incorrect of projects. following required material figure out doing mistake. this source. @entity @table(name="project") public class projectbean { @id @generatedvalue @column(name="project_id") private int projectid; @column(name="title") private string projecttitle; @manytomany(mappedby="projects") private collection<employeebean> employees; public projectbean() { employees = new arraylist<employeebean>(); } //getters & setters } @entity @table(name="employee") public class employeebean { @id @generatedvalue @column(name="employee_id") private int employee_id; @column(name="first_name") private string ...
Read more