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OtherOnline-Judges

problems in Online judges like codeforces,Spoj,hackerearth etc problems that i tried in online judges like codeforces,SPOJ

LeetCode

  • 1 -Two Sum - Accepted
  • 7 -Reverse Integer -Accepted
  • 9 -Palindrome Number - in two ways -> first one is making string reverse,other one is doing the reverse and checking(Accepted)
  • 13 -Roman To Integer - Accepted
  • 20 - Valid Parentheses - Accepted
  • 101 - Symmetric Tree
  • 102 - Binary Tree Level Order Traversal
  • 342 -Power of four(checking reminder method-log(n),Logarithomic solution(coomplexity-Math.Log function of Java))
  • 520 - Detect Capital(bruitForce(2m,40% daster),counting uppercase(1ms,99.55% faster))
  • 705 - Hashmap impementation
  • 121 - BestTime to buy and sell stock
  • 50 - Pow(x, n)
  • 94 - Binary Tree Inorder Traversal
  • 242 - Valid Anagram

LeetCode SQL

  • 595 -Big Countries - where and union operator was used..second apporach - OR operator
  • 627 - Swap salaries - swaping values in a column using SET,CASE and WHEN
  • 1179 - Reformat Department Table
  • 175 -Joining two tables - used Left joining to do it
  • 176 - Second Highest Salary - used subquery to do it
  • 177 - Nth Highest salary - using Limit , Order and OFFSET
  • 196 - Delete duplication - https://github.com/PlabonKumarsaha/Problem_Solutions_OJ/blob/master/LeedCodeSQL/196Delete%20Duplicate%20Emails.txt
  • 178 - Rank Score - using ,dense_rank()
  • 620 - Not Boring Movies- desc
  • 182 - Duplicate Emails
    1. Customers Who Never Order - using NOT IN

hackerRank

  • 12hrTo24hrConversion
  • Counting vallys
  • desigingPDF
  • PassordPattern

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codeforces,UVA, Spoj,hackerearth etc online judges

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