比赛链接

Problems	AC
A. Perpendicular Segments	○
B. Black Cells	○
C. Action Figures	○
D. Sums of Segments	○
E. Best Subsequence	○
F. Bermart Ice Cream

比赛链接

Problems	AC
A. Closest Point	○
B. Game with Doors	○
C. Splitting Items	○
D. Colored Portals	○
E. Not a Nim Problem	⊕
F. Make a Palindrome
G. Substring Compression

比赛链接

Problems	AC
A. Dora’s Set	○
B. Index and Maximum Value	○
C. Dora and C++	○
D. Iris and Game on the Tree	○
E. Iris and the Tree	○
F. Eri and Expanded Sets

比赛链接

Problems	AC
A. Turtle and Good Strings	○
B. Turtle and Piggy Are Playing a Game 2	○
C. Turtle and Good Pairs	○
D1. Turtle and a MEX Problem (Easy Version)	○
D2. Turtle and a MEX Problem (Hard Version)	⊕
E1. Turtle and Inversions (Easy Version)	⊕
E2. Turtle and Inversions (Hard Version)	⊕
F. Turtle and Three Sequences

比赛链接

Problems	AC
A. Question Marks	○
B. Parity and Sum	○
C. Light Switches	○
D. Med-imize	⊕
E. Xor-Grid Problem	待补
F1. Dyn-scripted Robot (Easy Version)	⊕
F2. Dyn-scripted Robot (Hard Version)	⊕

《i didnt know i needed a plush tree until now》

比赛链接

Problems	AC
A. Maximize the Last Element	○
B. AND Reconstruction	○
C. Absolute Zero	○
D. Prime XOR Coloring	○
E. Coloring Game	⊕
F. Triangle Formation
G. Grid Reset
H. Prime Split Game
I. Grid Game

C：log 推柿子
D：正难则反，dp 补集
比赛链接

Problems	AC
A. Diagonals	○
B1. Bouquet (Easy Version)	○
B2. Bouquet (Hard Version)	○
C. Squaring	⊕
D. Cases	⊕
E1. Let Me Teach You a Lesson (Easy Version)
E2. Let Me Teach You a Lesson (Hard Version)

比赛链接

Problems	AC
A. Submission Bait	○
B. Array Craft	○
C. Mad MAD Sum	○
D. Grid Puzzle	⊕
E1. Catch the Mole(Easy Version)
E2. Catch the Mole(Hard Version)
F. Polygonal Segments

最自闭的一集。

tbh 赛前一整天心理状态都不太好，压力也很大。稍微甩个锅吧。

出题人：I failed to find a Div2-A level proof. If you have a simpler proof please share it in the comments.

比赛链接

Problems	AC
A. Split the Multiset	○
B. Make Majority	○
C. Increasing Sequence with Fixed OR	○
D. The Omnipotent Monster Killer	⊕
E. Range Minimum Sum	⊕
F. Heartbeat