你好，Codeforces!

We are delighted to invite you to participate in Codeforces Round 1105 (Div. 1) or Codeforces Round 1105 (Div. 2),which will be held on 27.06.2026 17:35 (Московское время).

For both division 1 ans division 2, you will be given $$$2.5$$$ hours to solve $$$6$$$ problems.

The scoring distribution will be announced later.

The problems were authored and prepared by Gold14526, Milkcat2009 and wangmarui.

We would really like to thank the following people for making this round possible:

• cadmiumky for the great coordination.
• hcywoi and Network_Error who also prepared problems that were ultimately not used in this round.
• lkrqwq for optimizing many details of problems.
• errorgorn for black red testing.
• Network_Error, StelIawinD, _istil, jiazhichen844, ETO_leader, Dragos, MtSaka, Caylex, nifeshe, rolandpetrean for red testing.
• Proof_by_QED, lkrqwq, Watersphere, Timosh, tzl_Dedicatus545, 0x0002, a_little_cute, morandyg, abruce, programpiggy for yellow testing.
• MornStar, Ns6Juruo for purple testing.
• cybher, zhouyitao123, Nyemot, Pie_TealCompressorDragon for blue testing.
• xiaohaoaibiancheng666 for cyan testing.
• NSZBD_dklmq_12 for green testing.
• NanguX for gray testing.
• MikeMirzayanov and KAN for the great Codeforces and Polygon platforms.
• You for participating in this round.

Score Distribution:

Good Luck & Have Fun!