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# Exercise Title Features Description Platform Keywords
1 Skip List Introduction Slideshow Algorithm Visualization Slideshow showing an idealized version of the Skip List as an introduction to the concepts. OpenDSA Skip List
2 Skip List Insert Slideshow Algorithm Visualization Slideshow showing examples of insertion into a Skip List. OpenDSA Skip List, Randomized Algorithm
3 Skip List Delete Slideshow Algorithm Visualization Slideshow showing examples of deletion from a Skip List. OpenDSA Skip List, Randomized Algorithm
4 Letter frequency (count) Code Completion Write a method that computes how often each letter A-Z or a-z occurs in a string. Don't distinguish between upper-... CodeCheck Arrays and Array Lists
5 Letter frequency (percentage) Code Completion Write a method that computes the frequency (as a percentage between 0.0 and 1.0) of each letter A-Z or a-z... CodeCheck Arrays and Array Lists
6 Solving Josephus Problem Challenge Construct a program by using Queue structure to solve a Josephus problem. Josephus problem is a counting-out game. N people... PCEX
7 Swap adjacent characters in a RandomAccessFile Code Completion Your task is to swap adjacent letters in a RandomAccessFile. Simply read two bytes, back up by two bytes, and... CodeCheck Advanced Input and Output