This book constitutes the refereed proceedings of the 13th International Symposium on Experimental Algorithms, SEA 2014, held in Copenhagen, Denmark, in June/July 2014.

The 36 revised full papers presented together with 3 invited presentations were carefully reviewed and selected from 81 submissions. The papers are organized in topical sections on combinatorial optimization, data structures, graph drawing, shortest path, strings, graph algorithms and suffix structures.

This volume contains the papers presented at SWAT 2004, the 9th Scandi- vian Workshop on Algorithm Theory, which was held on July 8-10, 2004, at the Louisiana Museum of Modern Art in Humlebaek on the Oresund coast north of Copenhagen. The SWAT workshop, in reality a full-?edged conference, has been held biennially since 1988 and rotates among the ?ve Nordic countries, D- mark, Finland, Iceland, Norway, and Sweden. The previous meetings took place ? in Halmstad (1988), Bergen (1990), Helsinki (1992), Arhus (1994), Reykjavik (1996), Stockholm (1998), Bergen (2000), and Turku (2002). SWAT alternates with the Workshop on Algorithms and Data Structures (WADS), held in o- numbered years. Thecallforpapersinvitedcontributionsonallaspectsofalgorithmtheory.A totalof121submissionswasreceived-anoverallSWAThigh.Theseunderwent thorough reviewing, and the program committee met in Copenhagen on March 20-21, 2004, and selected 40 papers for presentation at the conference. The programcommitteewasimpressedwiththequalityofthesubmissionsand, given the constraints imposed by the choice of conference venue and duration, had to make some tough decisions. The scienti?c program was enriched by invited presentations by Gerth Stolting Brodal (University of Aarhus) and Charles E. Leiserson (Massachusetts Institute of Technology). TwosatelliteeventswereheldimmediatelybeforeSWAT2004: theWorkshop on On-Line Algorithms (OLA 2004), organized by members of the Department of Mathematics and Computer Science at the University of Southern Denmark, and the Summer School on Experimental Algorithmics, organized by the Perf- mance Engineering Laboratory in the Department of Computing at the Univ- sity of Copenhagen. More information about SWAT 2004 and its satellite events is available at the conference web sitehttp: //swat.diku.dk/.