Skip to main content

LeetCode Problem #19 Remove Nth Node From End of List

Solution for LeetCode Problem #19 Remove Nth Node From End of List
it is linked list problem can be solved with multiple solutions, but I'm gonna solve it with fastest solution in java.

Problem link

  1. we should assign dummy_head it is common while solving linked list problems 
  2. Assign 2 iterators slow and fast both equals to dummy_head
  3. we don't know the length of the list but we know it is always valid, so we will move with a window of size n+1 when we reach the end by the fast iterator the slow iterator will be in the node n+1 from the last, right?
  4. we will assign slow.next to be equal slow.next.next we are dropping the node n from last, got it?
  5. we will return dummy_head.next






Thank you,
AhmedG
Labels:

Comments

Post a Comment

Popular posts from this blog

DevExpress C# Chart Tutorial

Hello , this blog post about Charting in DevExpress , I faced many problems I visited hundreds of pages to solve this problems , actually it was the first time I use DevExpress Charts, Work is not like school or university , in school if you don't know thing you can learn it any time you want , in work you have to do today task yesterday, I like to share my knowledge and skills with you , I hope this Post help you . // clear series on chart  chart.Series.Clear(); // clear Titles of chart chart.Titles.Clear(); // legend alignment  chart.Legend.AlignmentHorizontal = LegendAlignmentHorizontal.Center; chart.Legend.AlignmentVertical = LegendAlignmentVertical.Bottom; chart.Legend.Direction = LegendDirection.LeftToRight; // creating series // series view Type example Line DevExpress.XtraCharts.Series series = new DevExpress.XtraCharts.Series("series name ", ViewType.Line); // add title  DevExpress.XtraCharts.ChartTitle chtTitle = new DevExpress.XtraCharts.Cha...
3 comments
Read more

Designing Entity Relationship Diagram (ERD)

Al Salmo Aliko . Hello, in this post I'll discuss with you how to design good Entity Relationship Diagram ERD . this article for: IT Students learning about database. you are having difficulties in creating ERD. you are developer that need help in database design.   let's ask ourselves Why good database design is good ? or why we need ERD?         when I started programming Eng / Eman Ahmed was my First teacher, she said you must write your code with pen, and now I told you good database design start with paper and pen or in technological terms start with ERD, ERD is the model which shows logical layout of your database. let's List some advantages of good database design : very low or no redundant data is stored.  supporting planed or unplanned queries. good design easy to maintain and modify. from first glance you can understand it. an ERD consist from Entities and relationships between them; there exist...
2 comments
Read more

XML tutorial

SA one of my objectives for this article making you curios to know about XML , and make you search the web for more info about it , and i hope do that , lets start. what is XML stand  for ? e X tensible  M arkup L anguage. it is used to transport data over the internet , you can invent your own tags , no restriction . for example if you want transport data for weather news: < weathernews > < new > < city > Cairo < / city > < max >36< / max > < min > 22 < / min > < / new > < / weathernews > XML   consist of main three component : tagged elements. attributes. text. lets see example: < bookstore > < book category="CHILDREN" > < title lang="en" > Harry Potter< /title > < author>J K. Rowling< /author > < year >2005< /year > < price>29.99 < /book > < book category="WEB" > < title lang="en" >Learn...
1 comment
Read more