[ABC220B] Base K

[ABC220C] Long Sequence

[ABC220D] FG operation

[ABC220E] Distance on Large Perfect Binary Tree

[ABC220F] Distance Sums 2

[ABC220G] Isosceles Trapezium

[ABC220H] Security Camera

[ABC221A] Seismic magnitude scales

[ABC221B] typo

[ABC221C] Select Mul

[ABC221D] Online games

[ABC221E] LEQ

[ABC221F] Diameter set

[ABC221G] Jumping sequence

[ABC221H] Count Multiset

动态规划 DP

[ABC222A] Four Digits

[ABC222B] Failing Grade

[ABC222C] Swiss-System Tournament

[ABC222D] Between Two Arrays

[ABC222E] Red and Blue Tree

[ABC222F] Expensive Expense

线段树 · 树形 DP · 树的直径

[ABC222G] 222

[ABC222H] Beautiful Binary Tree

拉格朗日反演

[ABC223A] Exact Price

[ABC223B] String Shifting

[ABC223C] Doukasen

[ABC223D] Restricted Permutation

[ABC223E] Placing Rectangles

[ABC223F] Parenthesis Checking

[ABC223G] Vertex Deletion

[ABC223H] Xor Query

[ABC224A] Tires

[ABC224B] Mongeness

[ABC224C] Triangle?

[ABC224D] 8 Puzzle on Graph

广度优先搜索 BFS

[ABC224E] Integers on Grid

[ABC224F] Problem where +s Separate Digits

[ABC224G] Roll or Increment

[ABC224H] Security Camera 2

[ABC225A] Distinct Strings

[ABC225B] Star or Not

[ABC225C] Calendar Validator

[ABC225D] Play Train

[ABC225E] フ

[ABC225F] String Cards

动态规划 DP

[ABC225G] X

[ABC225H] Social Distance 2

[ABC226A] Round decimals

[ABC226B] Counting Arrays

[ABC226C] Martial artist