PPT-Hash Tables: Handling Collisions

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 . 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. Date, Section, Pages, etc.. Mr. Richter. Agenda. Today:. Warm Up. Review HW from 7.1. Practice Problems for 7.2. Intro to Collisions (7.3). Tomorrow . Conservation of Momentum Lab. Thursday: . Review HW from 7.2. Comp 550. Dictionary . Dictionary:. Dynamic-set data structure for . storing items indexed using . keys. .. Supports . operations: Insert, Search, and . Delete . (. take . O. (1) time. ). .. Applications:. in kinetic plasma physics. Gérard. BELMONT. Laboratoire. de Physique des Plasmas. Ecole. . Polytechnique. , France. Outline. LUTH, Février 2016, Belmont. 2. /39. Collisions in a plasma. Collisions in a neutral gas: where our common intuition comes from. Martin Åkerblad. William . bruce. What is . Hashing?. Index. Key. 1. 2. 3. 4. 5. 6. 7. Key. 56. 84. 23. 42. 71. 97. 55. Hash. . function. 56. 42. 71. 23. 84. 55. 97. Value. When to use hashing.. Quick searching in large databases. Miles. Jones. MTThF. 8:30-9:50am. CSE 4140. September 1, 2016. Element Distinctness: WHAT. Given list of positive integers a. 1. , a. 2. , …, a. n. decide whether all the numbers are . distinct or whether there is a . CIS 606. Spring 2010. Hash tables. Many applications require a dynamic set that supports only the . dictionary . operations . INSERT. , SEARCH, and DELETE. Example: a symbol table in a compiler.. A hash table is effective for implementing a dictionary.. Bell Ringer. A . 40 kg . miniature horse runs west at . 8m/s. . What is the force . of impact if it hits a wall and . comes to a stop . in . 0.5s. ?. Objectives. We will . demonstrate . and apply the laws of . University of Michigan. Physics Department. Mechanics and Sound . Intro . Labs. Two-Dimensional Collisions. You have now seen the laws of conservation of momentum and energy in action in one-dimensional collisions, and you have begun to explore rotational motion. Now it is time for you to apply these concepts to a two-dimensional situation.. 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. Statistics. “One out of every four accidents can be blamed on poor backing techniques”. - National Safety Council. …If only trucks would bend…. Statistics. The cost of “Property Damage Crash” (a typical backing up accident) is presently estimated at an average of $7,400 per event. Law of Conservation of Momentum. With no external force, momentum doesn’t change. It’s the opposite of the impulse momentum relationship!. Ft = Δmv. Example. Consider a gun being fired.. A gun recoils when it is fired. . 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 . 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.