Hello Codeforces!↵
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<img src="https://cdn.discordapp.com/attachments/1488567390223466577/1504366688068698212/VL1_VNOI_CUP2.png?ex=6a06ba28&is=6a0568a8&hm=7311d42ec47477ede77768da7526c794652d2a03e8c4958e6690525457495846&" style="float: right; margin-left: 10px; width: 40%;" />↵
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We are excited to invite you to join us on **Saturday, May 16**, and try the same fun yet challenging problems from **Round 1 — VNOI CUP 2026**!↵
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- 🔈 **Contest:** https://oj.vnoi.info/contest/vnoicup26_r1_mirror↵
- 📅 **Time:** [May 16, 2026 — 20:30 (GMT+7)](https://www.timeanddate.com/worldclock/fixedtime.html?day=16&month=5&year=2026&hour=13&min=30&sec=0&p1=0)↵
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*If you are Vietnamese and eligible to participate in the official round, we strongly encourage you to register and compete there instead.*↵
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This year, we also plan to invite a few top international participants from the unofficial mirror rounds to join the **Final Round onsite in Vietnam**. These participants will compete in the **Open Division** of the Final Round — a separate onsite leaderboard from the official Vietnamese contestants.↵
↵
⚠️ Please note: invited participants from the Open Division will need to **cover their own travel and accommodation expenses.** However, VNOI will assist with hotel booking to make logistics easier for you.↵
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VNOI CUP is a Competitive Programming competition hosted by VNOI (Vietnam Olympiads in Informatics community), a group of Vietnamese programmers working together to make programming competitions more fun and challenging in Vietnam. We're a non-profit organization dedicated to supporting the growth of competitive programming in Vietnam, and this competition is one of the many ways we aim to achieve that goal.↵
↵
A huge shoutout to our awesome problem setters and testers! Thanks to their hard work, we have an exciting and high-quality problem set ready for you.↵
↵
- **Setters:** [user:Kuroni,2026-05-14], [user:Namine,2026-05-14], [user:bachbeo2007,2026-05-14], [user:darkkcyan,2026-05-14], [user:hihihaha,2026-05-14], [user:huyhasun,2026-05-14], [user:i_love_huyhau6a2,2026-05-14], [user:xuanquang1999,2026-05-14], [user:MofK,2026-05-14] ↵
- **Testers:** [user:conqueror_of_tourist,2026-05-14], [user:awoo,2026-05-14], [user:shinchankosen,2026-05-14], [user:WataHata,2026-05-14]↵
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VNOI CUP 2026 will consist of **two online qualification rounds** followed by an **onsite Final Round**. The qualification rounds will each last **3 hours** and feature **7 problems**. Based on the results, the top Vietnamese contestants will advance to the Final Round, which is expected to be held **onsite in July 2026**.↵
↵
- **Qualification Round 1:** May 16, 2026 — 20:30 (GMT+7)↵
- **Qualification Round 2:** May 30, 2026 — 20:30 (GMT+7)↵
- **Final Round (Onsite):** July 2026 (exact date TBA)↵
↵
As in previous years, the competition will be used with multiple subtasks with partial scoring, and penalty time based on incorrect submissions.↵
↵
- Scoring: Each problem includes several subtasks with different constraints and point values. You must pass all test cases in a subtask to earn its points.↵
- Penalty Time: Equals the time of your last score-increasing submission for each problem, plus 5 minutes for each incorrect submission.↵
- Ranking: Determined by total score (descending). Ties will be broken by lower total penalty time.↵
↵
⚠️ Each participant must only use **one VNOJ account**. Anyone who is found using multiple accounts will be disqualified and may be banned from future contests.↵
↵
⚠️ **Please refrain from using AI assistance tools during the contest.** While the unofficial round is not subject to the same enforcement measures as the official round, we ask all participants to respect the spirit of fair competition.↵
↵
We hope you enjoy the contest and wish all participants the best of luck! 🚀↵
↵
---↵
↵
- 🔈 **Contest:** https://oj.vnoi.info/contest/vnoicup26_r1_mirror↵
- 📅 **Time:** [May 16, 2026 — 20:30 (GMT+7)](https://www.timeanddate.com/worldclock/fixedtime.html?day=16&month=5&year=2026&hour=13&min=30&sec=0&p1=0)↵
- 💻 **Platform:** VNOJ (online)↵
- 📜 **Rules:** https://s.vnoi.info/vnoi-cup-2026-rule-cf↵
- 🌏 **Facebook:** https://www.facebook.com/vnoi.wiki↵
- 📡 **Discord:** https://discord.gg/QUK2Tgr↵
- ⏲ **VNOI Forum:** https://www.facebook.com/groups/VNOIForum↵
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<img src="https://cdn.discordapp.com/attachments/1488567390223466577/1504366688068698212/VL1_VNOI_CUP2.png?ex=6a06ba28&is=6a0568a8&hm=7311d42ec47477ede77768da7526c794652d2a03e8c4958e6690525457495846&" style="float: right; margin-left: 10px; width: 40%;" />↵
↵
We are excited to invite you to join us on **Saturday, May 16**, and try the same fun yet challenging problems from **Round 1 — VNOI CUP 2026**!↵
↵
- 🔈 **Contest:** https://oj.vnoi.info/contest/vnoicup26_r1_mirror↵
- 📅 **Time:** [May 16, 2026 — 20:30 (GMT+7)](https://www.timeanddate.com/worldclock/fixedtime.html?day=16&month=5&year=2026&hour=13&min=30&sec=0&p1=0)↵
↵
*If you are Vietnamese and eligible to participate in the official round, we strongly encourage you to register and compete there instead.*↵
↵
↵
This year, we also plan to invite a few top international participants from the unofficial mirror rounds to join the **Final Round onsite in Vietnam**. These participants will compete in the **Open Division** of the Final Round — a separate onsite leaderboard from the official Vietnamese contestants.↵
↵
⚠️ Please note: invited participants from the Open Division will need to **cover their own travel and accommodation expenses.** However, VNOI will assist with hotel booking to make logistics easier for you.↵
↵
---↵
↵
VNOI CUP is a Competitive Programming competition hosted by VNOI (Vietnam Olympiads in Informatics community), a group of Vietnamese programmers working together to make programming competitions more fun and challenging in Vietnam. We're a non-profit organization dedicated to supporting the growth of competitive programming in Vietnam, and this competition is one of the many ways we aim to achieve that goal.↵
↵
A huge shoutout to our awesome problem setters and testers! Thanks to their hard work, we have an exciting and high-quality problem set ready for you.↵
↵
- **Setters:** [user:Kuroni,2026-05-14], [user:Namine,2026-05-14], [user:bachbeo2007,2026-05-14], [user:darkkcyan,2026-05-14], [user:hihihaha,2026-05-14], [user:huyhasun,2026-05-14], [user:i_love_huyhau6a2,2026-05-14], [user:xuanquang1999,2026-05-14], [user:MofK,2026-05-14] ↵
- **Testers:** [user:conqueror_of_tourist,2026-05-14], [user:awoo,2026-05-14], [user:shinchankosen,2026-05-14], [user:WataHata,2026-05-14]↵
↵
---↵
↵
VNOI CUP 2026 will consist of **two online qualification rounds** followed by an **onsite Final Round**. The qualification rounds will each last **3 hours** and feature **7 problems**. Based on the results, the top Vietnamese contestants will advance to the Final Round, which is expected to be held **onsite in July 2026**.↵
↵
- **Qualification Round 1:** May 16, 2026 — 20:30 (GMT+7)↵
- **Qualification Round 2:** May 30, 2026 — 20:30 (GMT+7)↵
- **Final Round (Onsite):** July 2026 (exact date TBA)↵
↵
As in previous years, the competition will be used with multiple subtasks with partial scoring, and penalty time based on incorrect submissions.↵
↵
- Scoring: Each problem includes several subtasks with different constraints and point values. You must pass all test cases in a subtask to earn its points.↵
- Penalty Time: Equals the time of your last score-increasing submission for each problem, plus 5 minutes for each incorrect submission.↵
- Ranking: Determined by total score (descending). Ties will be broken by lower total penalty time.↵
↵
⚠️ Each participant must only use **one VNOJ account**. Anyone who is found using multiple accounts will be disqualified and may be banned from future contests.↵
↵
⚠️ **Please refrain from using AI assistance tools during the contest.** While the unofficial round is not subject to the same enforcement measures as the official round, we ask all participants to respect the spirit of fair competition.↵
↵
We hope you enjoy the contest and wish all participants the best of luck! 🚀↵
↵
---↵
↵
- 🔈 **Contest:** https://oj.vnoi.info/contest/vnoicup26_r1_mirror↵
- 📅 **Time:** [May 16, 2026 — 20:30 (GMT+7)](https://www.timeanddate.com/worldclock/fixedtime.html?day=16&month=5&year=2026&hour=13&min=30&sec=0&p1=0)↵
- 💻 **Platform:** VNOJ (online)↵
- 📜 **Rules:** https://s.vnoi.info/vnoi-cup-2026-rule-cf↵
- 🌏 **Facebook:** https://www.facebook.com/vnoi.wiki↵
- 📡 **Discord:** https://discord.gg/QUK2Tgr↵
- ⏲ **VNOI Forum:** https://www.facebook.com/groups/VNOIForum↵
