Indoor Cycling

Combinatorial optimization problems arise across logistics, scheduling, and engineering, and C++ remains a language of choice when performance matters. This lecture takes a practical look at solving such problems in C++, using the Electric Vehicle Routing Problem as a running example. We begin with an exact solver, formulating the problem as a mixed-integer program and trying to solve it through GLPK's C API directly from C++. Exact methods, however, quickly hit their limits on real-world instances. The second half of the talk turns to metaheuristics: how they are designed, why C++ is particularly well suited for implementing them, and what design choices matter most in practice. We'll walk through a concrete implementation, touching on data structures for fast neighborhood evaluation, generic algorithm design with templates, and the performance considerations that separate a prototype from a production-ready solver. The goal is not to advocate for one approach over another, but to show how C++ supports the full spectrum of optimization techniques. # About Speaker Luka Matijević is a researcher at the Mathematical Institute of the Serbian Academy of Sciences and Arts, whose work bridges academic research and freelance engineering. He's drawn to identifying the right algorithm for a given problem — and to the kind of careful optimization captured by one of his favourite Futurama lines: *"When you do things right, people won't be sure you've done anything at all."* ## 📅 Event Details | | | | --- | --- | | 👤 **Speaker** | **[Luka Matijević](https://www.linkedin.com/in/luka-matijevic/)** | | 🕕 **Date & Time** | **27th of May (Wednesday), 6 pm** | | 📍 **Location** | **Beograđanka, Vidikovac, 22nd floor** | | 🏢 **Address** | **Masarikova 5** | | 💻 **Online** | **[C++ Serbia YouTube](https://www.youtube.com/@cppserbia)** | See you!

**Weather permitting**, we’ll take a casual ride from Pickerington Ponds (Glacier Knoll) to Three Creeks and back. Distance is **18–25 miles**, depending on where we turn around and whether we add a side loop. Pace is around **12 mph**, but this is a fun, no‑drop ride — we can slow down as needed. Here’s the **map** showing Glacier Knoll (bike), Confluence Park (flag), and BrewDog: [https://www.google.com/maps/d/edit..](https://www.google.com/maps/d/edit..). Text or call Scott at **614‑975‑4458** if you’re coming. Columbus ski club membership not required for this event. CSC assumes no responsibility for the event or any injuries as this is organized by a third party.

Discover practical ways homeowners can expand tree canopy on their own properties and advocate for stronger tree coverage in their communities. Come learn how important trees are, even in our own yards, for helping with climate change by absorbing carbon and reducing heat, providing habitat for wildlife, and improving the health and wellbeing of our communities through cleaner air, shade, and more comfortable places to live. **Presenter** Todd Fleishans is a local consulting arborist with more than twenty years of experience. His credentials include ISA Board Certified Master Arborist, Certified Urban Forestry Arborist, Certified Tree Safety Professional, and Registered Consulting Arborist. He works with residential, commercial, and municipal clients, providing expertise in tree identification, health, risk assessment, and valuation. **Evening's Agenda** This meeting has the option to either attend in-person at the Bloomfield Township Library at 1099 Lone Pine Rd, Bloomfield Township, MI 48302 in Meeting Room 2 or online via Zoom. For those attending in-person, there will be a meet-n-greet before the presentation - see the agenda below for details. * 6:30 pm – Doors open for a meet and greet with members, supporters, and the local Sierra Club Executive Committee * 7:00 pm – Introductions and presentation begin (remote participants should join at this time) * 8:00 pm – Question-and-answer session begins **About SEMG Monthly Meetings & Presentations:** The Sierra Club Southeast Michigan Group (SEMG) offers free presentations during its monthly first-Thursday meetings at 7 pm. Meetings are held via Zoom or in person, begin with brief announcements, and feature an hour-long presentation with Q&A. All are welcome.

**How to take control of your subconscious and harness its power!** Join us for an eye-opening lecture where the speaker will break down complex ideas in a clear and practical way. You’ll gain insights into: ✅ The true definition of the subconscious ✅ How it generates unwanted emotions ✅ Its real purpose and function ✅ What determines the pressure it exerts on you And the most important topic: **How do you take control of your subconscious!** But this isn’t just another lecture where you sit and listen passively. It’s interactive and engaging—you can ask questions at any time. 📅 Reserve your spot now! Seats are limited, so don’t wait too long to sign up. Location: 1266 Dublin Rd, Columbus, OH 43215 Hosted by the Hubbard Dianetics Foundation

**Weather permitting**, we’ll take a casual ride from Pickerington Ponds (Glacier Knoll) to Three Creeks and back. Distance is **18–25 miles**, depending on where we turn around and whether we add a side loop. Pace is around **12 mph**, but this is a fun, no‑drop ride — we can slow down as needed. Here’s the **map** showing Glacier Knoll (bike), Confluence Park (flag), and BrewDog: [https://www.google.com/maps/d/edit..](https://www.google.com/maps/d/edit..). Text or call Scott at **614‑975‑4458** if you’re coming. Columbus ski club membership not required for this event. CSC assumes no responsibility for the event or any injuries as this is organized by a third party.

Hosted by Licking County Parks Registration opens at 9am on April 9th. Ladies are you ready? It's back! Every other year we hold the Women's Outdoor Skills Workshop! The day is a chance for women to relax, enjoy exploring new skills in a welcoming environment, and make new connections! Session topics this year include: archery, kayak, stand up paddleboard, outdoor cooking, firemaking, knot tying, foraging, forest bathing, orienteering, nature photography, nature journaling, intro to disc golf, yoga, Tai Chi, birding, intro to backpacking, and more! Lunch is provided. Fee: $75 * Event Address: James Bradley Center, Infirmary Mound Park, 4309 Lancaster Rd, Granville, OH 43023 * Ages 16+. Under 18 must be accompanied by an adult. * Cancellation: Cancellation deadline is May 20, 2026. Cancellations before this date will receive a refund. There will be 4 sessions: three 1.5 hour sessions throughout the day (9am-10:30am, 10:50am-12:20pm, 1:30pm - 3pm) followed by the final 1 hour wellness short session (3:20pm - 4:20pm). Each session will have 6 or more classes to choose from. PLEASE NOTE YOU MUST FILL OUT THE GOOGLE FORM TO BE FULLY REGISTERED - The link will be in your receipt email. It determines your sessions. Sessions assigned FIRST COME, FIRST SERVE. Register and pay here: [https://www.lickingparkdistrict.com/271/June-2026](https://www.lickingparkdistrict.com/271/June-2026)