PPT-Anagrams and Hash Tables

Olac Fuentes University of Texas at El Paso Can we find anagrams in constant time Yes with time Ov to preprocess the words where v is the size of the vocabulary We will store the words in the English dictionary in a way that allows to find all the anagrams of any given word in constant time. In Section 4 of this Appendix the tables are carried out to a large number of decimal places and exact values are indicated by underlining In most of the other tables only a limited number of decimal places are given therefore making the tables bett brPage 1br Ancient Egypt Anagrams MY MUM YARD IMP ROACH CUTE A HARP OH TACO PEARL RICHLY HOSE Motivating Applications. Large collection of datasets. Datasets are dynamic (insert, delete). Goal: efficient searching/insertion/deletion. Hashing is ONLY applicable for exact-match searching. Direct Address Tables. Linear Probing. Uri Zwick. Tel Aviv University. Hashing with open addressing. “Uniform probing”. Insert key . in the first free position among.  . (Sometimes) assumed to be a . permutation. To search, follow the same order. . Sections 5.3, 5.4, 5.5, 5.6. 2. Designing a Hash Table. Hash function: establishing a key with an indexed location in a hash table.. E.g. . Index = hash(key) % table_size;. Resolve conflicts: . Need to handle case where multiple keys mapped to the same index.. Dominique Unruh. University of Tartu. Surprises with hash functions. Consider a hash function and a horse race. “Spicy Spirit” wins…. Commitments and hashes. Player. Bookie.  . Player. Bookie. By – . Debanjan. . Sadhya. (iwc2011013). Mayank. . Swarnkar. (iwc2011026). Contents. Introduction. Definition. Properties of SHA. SHA Functions. SHA Constants. Preprocessing in SHA. Hashing in SHA. Plan. I spent the last decade advising on numerous cases where hash tables/functions were used. A few observations on . What data structures I’ve seen implemented and where. What do developers think, were they need help. Hash Tables. . . 0. 1. 2. 3. 4. 451-229-0004. 981-101-0002. 025-612-0001. © 2014 Goodrich, Tamassia, Godlwasser. Presentation for use with the textbook . Data Structures and Algorithms in Java, 6. . Outline. Discuss what a hash method does. translates a string key into an integer . Discuss a few strategies for implementing a hash table. linear probing. quadratic probing. separate chaining hashing. n. . . [from the . techspeak. ] (var. ‘hash clash’) . When used of people, signifies a confusion in associative memory or imagination, especially a persistent one.” . . -. The Hacker's Dictionary . Uri Zwick. Tel Aviv University. Started: . April . 2015. Last update: . January 12, 2017. Hashing with open addressing. “Uniform probing”. Insert key . in the first free position among.  . (Sometimes) assumed to be a . CSE 373: Data Structures and Algorithms. Thanks to Kasey Champion, Ben Jones, Adam Blank, Michael Lee, Evan McCarty, Robbie Weber, Whitaker Brand, Zora Fung, Stuart . Reges. , Justin Hsia, Ruth Anderson, and many others for sample slides and materials .... A common approach is to use a . Distributed Hash Table. (DHT). to organize . nodes. Traditional . hash functions convert a key to a hash value, which can be used as an index into a hash table.. Keys are unique.