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dADS1 2011 Gerth Stølting Brodal

dADS1 2011 Gerth Stølting Brodal. Introduction to Algorithms and Data Structures Students: 152 Lectures : 2+2 hours Use clickers at lectures (new in 2011) Theoretical TØ: 3 hours Weekly mandatory group handins datLAB : Students prepare handin

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dADS1 2011 Gerth Stølting Brodal

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  1. dADS1 2011 GerthStølting Brodal • Introduction to Algorithms and Data Structures • Students: 152 • Lectures: 2+2 hours • Useclickersat lectures (new in 2011) • Theoretical TØ: 3 hours • Weeklymandatorygrouphandins • datLAB: Students preparehandin • Exam: Mix of multiple-choice & one-liners

  2. dADS1 2011 – clickerexperiencesGerthStølting Brodal • Slides oncoursewebpage – noclickerquestions • Slides withquestions password protectedafterlecture • Number of questions: ~ 2 per lecture (45 min) • Types of questions • Understanding of definitions • Understanding of algorithms • Constructive • Feedback – alwaysshown to the students • As expected • Converged to wronganswer (goodstarting point for discussion) • Questionbadlyphrased (back to the drawingboard...) • Noconvergence (to hard?) • Software: • PowerPoint (PresenterView) + TurningPointAnyWhere (I didn’tmanage to embedinto PowerPoint) • Usetwoprojectorsin auditorium: 1) Background info 2) Question

  3. Fourexamples from dADS1 • QuickSortLecture • Union-Findlecture • Interval treelecture • Amortizedanalysislecture ... and an example from an UNF talk

  4. Is the answer A or B ? a) Answer A • Answer B • Don’tknow

  5. Is the answer A or B ? a) Answer A • Answer B • Don’t know

  6. Sandsynlighedsteori Baggrund? • Ingen • Gymnasiet • Gymnasiet + Universitetet • Universitetet • Andet steds • Ved ikke

  7. Sandsynligheden for at slå krone 1/2

  8. EksperimentKast en Mønt • Plat • Krone • På højkant • Ingen mønt

  9. EksperimentAntal kast før man får krone ? • 1 • 2 • 3 • 4 • 5 • 6 • 7 • 8 • 9 eller flere • 1 • 2 • 3 • 4 • 5 • 6 • 7 • 8 • 9 eller flere

  10. EksperimentAntal kast før man får krone ? • 1 • 2 • 3 • 4 • 5 • 6 • 7 • 8 • 9 eller flere Sætning Forventede antal kast for at få krone = 2 Bevis □ s.s. for i’te kast er krone s.s. for først i-1 kast er plat # kast

  11. 1st vote a b c d e f g h i 2nd vote a b c d e f g h i Union-Find

  12. 1st vote a b c d e f 2nd vote a b c d e f Interval Tree

  13. 1st vote a b c d e 2nd vote a b c d e AmortizedAnalysis

  14. GooglePageRankTM MetodeRandomSurfer Start påknude 1 Gentag mange gange: Kast en terning: Hvis den viser 1-5: Vælg en tilfældig pil ud fra knuden ved at kaste en terninghvis 2 udkanter Hvis den viser 6: Kastterningenigenog spring hen til den knude somterningenviser

  15. GooglePageRankTM MetodeRandomSurfer Start påknude 1 Gentag mange gange: Kast en terning: Hvis den viser 1-5: Vælg en tilfældig pil ud fra knuden ved at kaste en terninghvis 2 udkanter Hvis den viser 6: Kastterningenigenog spring hen til den knude somterningenviser

  16. SimpelWebgraf — Sandsynlighedsfordeling

  17. My conclusionsaboutusingclickers... • Gives students time to understand the importantconcepts • Helpsmereflectonmylectures • Muchbetterfeelingwhere the students are • Use 2-3 hours per double lectureadding slides

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