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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.

HOW TO FIND US We’re meeting in the park around Liberation Square (Trg oslobođenja) on Thursday, 28.05, at 18:00 (no problem if you’re slightly late). Just look for the people with sketchbooks :) You can also follow us on Instagram - we’ll post some stories just before the meetup starts to help you locate us more easily in the park. Please note that the event starts at 18:00 local Sarajevo time (GMT+2). Meetup.com may display an incorrect time because the international group’s location is set to Finland, which is in a different time zone. \*\*\* HOW IT WORKS At each meetup, attendees take turns modeling for quick 10-minute sketch sessions. One person poses while everyone else sketches, then we rotate. \*\*\* WHAT TO BRING Pencils and paper (or any sketching tools you prefer). \*\*\* No fees, no pressure. The only thing we ask is that everyone takes a turn posing for the group. You can sit in whatever position feels comfortable - the 10 minutes go by quickly! Draw as much as you like, skip a round if you’re tired or just want to chat, and leave whenever it suits you. The event continues as long as there’s interest. \*\*\* STAYING CONNECTED We have a WhatsApp group for staying in touch and sharing updates. Ask the organizer to add you to the WhatsApp group during the meetup.

JOINING THE EVENT Please join the event through the Sketchy Collective international group. The Sarajevo sub-group is temporary and was created to make our group more visible to people in Sarajevo. You can find the link to the same event in the international group here: https://www.meetup.com/sketchy-collective-international/events/314735747/?eventOrigin=group_events_list HOW TO FIND US We’re meeting in the park around Liberation Square (Trg oslobođenja) on Thursday, 28.05, at 18:00 (no problem if you’re slightly late). Just look for the people with sketchbooks :) You can also follow us on Instagram - we’ll post some stories just before the meetup starts to help you locate us more easily in the park. \*\*\* HOW IT WORKS At each meetup, attendees take turns modeling for quick 10-minute sketch sessions. One person poses while everyone else sketches, then we rotate. \*\*\* WHAT TO BRING Pencils and paper (or any sketching tools you prefer). \*\*\* No fees, no pressure. The only thing we ask is that everyone takes a turn posing for the group. You can sit in whatever position feels comfortable - the 10 minutes go by quickly! Draw as much as you like, skip a round if you’re tired or just want to chat, and leave whenever it suits you. The event continues as long as there’s interest. \*\*\* STAYING CONNECTED We have a WhatsApp group for staying in touch and sharing updates. Ask the organizer to add you to the WhatsApp group during the meetup.

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.

BIKE RIDE TO SUNBURY Dust off your bikes, pump up your tires, and get out and ride. • When: Saturday, May 30, 10AM • Where: Leaving from the Westerville Library, 126 S. State Street, 43081 ◦ Meet at East side of parking lot by the playground. Trip Itentiary • 20 miles round trip • Ride to Sunbury, stop for lunch (Location TBD), then ride back to the Westerville Library • All skill levels welcome Contact: Therese Butz (614-561-1976), Art Kahn (614-370-5246) 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.

The aim of this group is to get together and practice our German. Doesn’t matter if are a beginner or a native speaker. The goal is to speak and improve our German. Everyone is welcome! If the weather is good, look for us in the Biergarten. Pro Tip: Get there before 6:00 for happy hour pricing.

NOTICE CHANGE OF LOCATION. WE WILL BE MEETING AT THE SHARON WOODS METRO PARK - THIS MONTH ONLY. Sharon Woods Metro Park, 6911 Cleveland Ave, Westerville, OH 43081 Enter the park from Cleveland Avenue and stay on the main park drive until it dead-ends into a turn around parking lot. We will meet at the Schrock Lake Shelter just off this parking area to the right. We will be taking a Guided Walk with access very near the shelter, on the Edward S Thomas trail, an ADA flat, hard-packed gravel surface trail. This walk will be led by Carrie Keller, Outdoor Naturalist at the park, and Megan Richley, Inclusion Coordinator for the Metro Parks. Wear sneakers or other shoes covering the entire foot. Sandals or flip-flops are ill advised. Sighted guides will be available. Target audience for this group is persons who are visually impaired, especially those who have experienced recent loss, however, all are welcome, including family members and supports. Light refreshments will be served. There will not be a Conference Call option for this meeting.

Let's grab some coffee/food and share a morning chat! The East Market has an ample parking lot and outdoor and indoor seating. Grab a cup of coffee from Winston's Coffee & Waffles or on your way to East Market and meet us on the second floor - table behind or east of the elevator. Per what this group is about: "Everyone is welcome! International transplants to Columbus who want to improve language skills, Columbus residents who enjoy talking to people from other countries, and those who would like to discuss international travel and culture, and who enjoy getting together for good conversations."

**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.

Bring your business cards and network in person with other business professionals! Gold Star Referral Clubs is one of the most established professional networking organizations in the country, with multiple groups in central Ohio. Join us!

[ECDI Pop-Up Market Official Registration Site --> https://www.eventbrite.com/e/ecdi-pop-up-market-tickets-1986071755083](https://www.eventbrite.com/e/ecdi-pop-up-market-tickets-1986071755083) Celebrate Small Business Month by shopping local for food, drinks, and handcrafted gifts! Join us for the ECDI Pop‑Up Market, a celebration of local entrepreneurs during Small Business Month. Explore delicious food and drinks, discover handcrafted goods, and shop unique items from small businesses in your community. Whether you’re looking to support local makers, discover new favorites, or pick up a thoughtful gift, this market has something for everyone. **What you’ll find at the market:** * Local food and beverage vendors * Handcrafted goods and unique gifts * A chance to meet and support small business owners in your community * An easy, fun way to discover new local favorites [SCORE Central Ohio](https://www.score.org/ "https://www.score.org/") will also be on site to talk about their small business mentorship program. **Market Vendors:** Baked Goods * Shante Makes Body Care * [Bellas Natural Beauty Products](https://www.facebook.com/Bellasnaturalbeautyprod/ "https://www.facebook.com/Bellasnaturalbeautyprod/") Clothing & Accessories * [The Krafted Kollection](https://www.thekraftedkollection.com/ "https://www.thekraftedkollection.com") * [Loayza Elegant Jewelry](https://www.loayzaelegantjewelry.com/ "https://www.loayzaelegantjewelry.com/") * [Swahili House 254](https://www.swahilihouse254.com/ "https://www.swahilihouse254.com") Food/Beverage * [Aqua Pure Central Ohio](https://aquapurecentralohio.com/ "https://aquapurecentralohio.com") * [Better Beverage](https://betterbevshop.com/ "https://betterbevshop.com") * [Cherays Banana Pudding](https://www.facebook.com/profile.php?id=61567527322952 "https://www.facebook.com/profile.php?id=61567527322952") * [Dr. May's Thai Kitchen](https://www.drmaysthaikitchen.com/menu "https://www.drmaysthaikitchen.com/menu") * [Kronchy LLC](https://www.kronchys.com/ "https://www.kronchys.com") * [Terra Mezcal Mexican Grill](https://terra%20mezcal%20mexican%20grill/ "https://Terra Mezcal Mexican Grill") Packaged Food * [Grow to Eat, Eat to Live](https://growtoeattolive.com/ "https://growtoeattolive.com/") * [Underworld Feast](https://underworldfeast.com/ "https://underworldfeast.com/")  Since 2004, ECDI has assisted Ohio’s entrepreneurs through their one-stop-shop business services model, suited to meet the needs of all entrepreneurs, regardless of what business stage they’re in. From providing capital to entrepreneurs looking to expand their businesses, to providing focused, business-specific educational opportunities to enhance entrepreneurial skill sets, ECDI works with their clients to meet their specific needs. Whether you merely have a business idea or are opening up your fifth location, we have helped more than 15,000 entrepreneurs to take advantage of the services we provide.