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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. # 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!

**How to Get Off-Market Deals With Direct-to-Seller Marketing** Want to learn how to get off-market deals through direct-to-seller marketing without relying on agents, wholesalers, or the MLS for consistent deal flow? That is exactly what we are covering at this next Columbus Investors Club Meetup. Get Your Free Ticket **[HERE](https://www.eventbrite.com/e/how-to-get-off-market-deals-with-direct-to-seller-marketing-tickets-1987845260686?aff=cicmeetupapp)**[ ](https://www.eventbrite.com/e/how-to-get-off-market-deals-with-direct-to-seller-marketing-tickets-1987845260686?aff=cicmeetupapp)🎟️ Most investors who try to do off-market deals make the same mistake: they throw money into a marketing channel, pray that it works, and hope a deal comes out the other side. There is no real strategy, no clear math, no tracking, and no process to know what is actually working. At this meetup, we are going to break down how to reverse engineer direct-to-seller marketing using our SCALE framework so you can approach your marketing with more clarity, confidence, and consistency. We will cover how to think through inbound, outbound, and free marketing channels, how to choose the right channel for your goals, how to run the numbers before you spend, how to allocate the right budget, how to launch the campaign correctly, and how to evaluate and track performance so you can make better decisions moving forward. **SCALE Framework:** **S –** Select the right channel **C –** Calculate the numbers **A –** Allocate the budget **L –** Launch the campaign **E –** Evaluate and track it **What We’ll Cover** * How to get off-market deals through direct-to-seller marketing * How to stop guessing and start reverse engineering your marketing * The difference between inbound, outbound, and free marketing channels * How to choose the right channel for your business and market * How to calculate the numbers before launching * How to allocate a budget based on goals, not emotion * How to launch and track a campaign the right way * How to create more consistent and predictable deal flow **Date:** May 28, 2026 (Thursday) **Time:** 6 - 8pm EST **Location:** Ohio Brewing Company, 421 E 2nd Ave, Columbus, OH 43201 **Save Your Seat** → https://www.eventbrite.com/e/how-to-get-off-market-deals-with-direct-to-seller-marketing-tickets-1987845260686?aff=cicmeetupapp **FREE DRINKS & FOOD PROVIDED!** **About Columbus Investors Club** The Columbus Investors Club is a local meetup for real estate investors, aspiring investors, contractors, vendors, lenders, realtors, and other professionals who want to grow in the Columbus market. The goal is to create real connection, real opportunity, and real growth by getting the right people in the room. Whether you are brand new or already doing deals, this is a place to build relationships, learn from others in the business, find opportunities, and grow your presence in the local real estate community.

Monthly working lunch for Columbus business owners. One specific topic, one to three actions you can run this week. You can be the best at what you do and still be invisible. If local buyers cannot find you, the phone does not ring. Marketing Monday Lunch + Learn is a monthly working lunch for Columbus business owners focused on building relationships, local networking, and local marketing. Every kind of local business welcome. No pitch round, no pressure, no upsell. **This month** Most local businesses pick one or two places to be visible and call it good. The result is inconsistent calls and a feeling that marketing is not working. We will walk through the three places every local business needs to show up, plus the fourth place most owners ignore that quietly produces the warmest leads. **What to expect** Doors open at noon. Order lunch and drinks at the cafe counter or bring your own. You get real conversation with other local owners and a focused marketing lesson. You leave knowing people and with one to three actions to run that week. The room is reserved through 1:30 PM. **Who this is for** Any local business owner who wants clearer marketing direction and real local relationships. Service businesses, retail, home services, professional services, online owners building local presence, anyone serious about being part of the Columbus business community. **Not the right fit if** You are here to pitch the room or recruit for an MLM. **Details** * Second Monday of every month * 12:00 to 1:30 PM * Good Cafe Easton, 4400 Easton Commons, Ste 150, Columbus, OH 43219 * Order lunch and drinks at the counter when you arrive * Free to attend, RSVP required, space is limited **About the host** Rita Suzanne is a local marketing strategist and the founder of Local Marketing Method. She runs Visibility is Profitability, the membership where local business owners build the system that keeps their phone ringing. Learn more at learnlocalmarketing.com. Register here: [https://www.eventbrite.com/e/1989964540509?aff=oddtdtcreator](https://www.eventbrite.com/e/1989964540509?aff=oddtdtcreator)

## Candle Making Night at The Arcane Foundry \| Design Your Own Custom Candle **SPECIAL PROMOTION**: Buy 3 and get 1 Free! Step into The Arcane Foundry and create your own custom candle from start to finish. This is a laid back, hands-on experience where **you’ll blend fragrances, choose your vessel, and pour your own candle using 100% soy wax**. Whether you’re coming solo or with friends, it’s designed to be simple, creative, and a good time. We’ll walk you through the entire process, from picking your scents to choosing between a traditional cotton wick or a crackling wood wick. You can go with one fragrance or mix your own blend to create something completely unique**. No experience needed**, just show up and we’ll handle the rest. While your candle sets, feel free to hang out, play a game, explore the shop, or just relax and talk. Drinks and snacks are available, and the atmosphere leans into the **fantasy**, **dark academia**, and **gothic horror** vibe The Arcane Foundry is known for. Learn More: [Candle Making in Columbus, Ohio at The Arcane Foundry](https://thearcanefoundry.com/candle-making/) *** ### What to Expect: * Guided candle making experience * Choose your own vessel, wax, wick, and fragrance * 100% soy wax candles * Optional drinks and snacks * Time to relax while your candle cools *** ### Important Notes: * Please arrive on time so we can start together * Candles will need time to set before taking home * This is a beginner-friendly event *** ### RSVP Required Reserve your spot on Meetup to lock in your seat. **Candle Making** (includes vessel, your choice of wick, wax, scented oil, labels and lids) 5oz Glass Jars $15 8oz Candle Tins $25 12oz Glass Candles $35 12oz Amber Jars $40 16 oz Skull or Jack o Lantern Candle Mugs $65 (Limited Edition!) **All materials included. You just bring yourself (and your drink of choice).** **Payments accepted:** * Credit Card * Venmo: @Daclaud-Lee * Cashapp: $DaclaudL

Free monthly networking for Columbus business owners. Real conversations, real connections, no forced formats. Space is limited. RSVP now. Most owners leave networking events with a stack of business cards and no plan. The best leads quietly slip through the cracks. Networking Night is a monthly meetup for Columbus business owners who want to build real local relationships, not just trade contact info. Every kind of local business welcome. No pitch round, no pressure, no awkward speed-networking. **This month** We are focused on referral relationships. Walk in with a clear idea of who refers people like you. Walk out having met a few owners whose work fits next to yours. **What to expect** Doors open at 6 PM. You get real conversation with other local owners, time to actually connect, and a short marketing lesson woven in. The room is reserved through 7:30 PM. **Who this is for** Any local business owner who wants to grow through relationships, not just paid ads. Service businesses, retail, home services, professional services, online owners building local presence, anyone serious about being part of the Columbus business community. **Not the right fit if** You are here to pitch the room or recruit for an MLM. **Details** * Last Thursday of every month * 6:00 to 7:30 PM * COhatch Easton * Free to attend, RSVP required, space is limited **About the host** Rita Suzanne is a local marketing strategist and the founder of Local Marketing Method. She runs Visibility is Profitability, the membership where local owners build the system that keeps their phone ringing, including tracking the referral relationships built in rooms like this one. Learn more at learnlocalmarketing.com. Register here: [https://www.eventbrite.com/e/local-marketing-networking-night-tickets-1988510112275](https://www.eventbrite.com/e/local-marketing-networking-night-tickets-1988510112275)

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."