[ABC206B] Savings

[ABC206C] Swappable

[ABC206D] KAIBUNsyo

[ABC206E] Divide Both

[ABC206F] Interval Game 2

[ABC207A] Repression

[ABC207B] Hydrate

[ABC207C] Many Segments

[ABC207D] Congruence Points

[ABC207E] Mod i

[ABC207F] Tree Patrolling

树形 DP

[ABC208A] Rolling Dice

[ABC208B] Factorial Yen Coin

[ABC208C] Fair Candy Distribution

[ABC208D] Shortest Path Queries 2

[ABC208E] Digit Products

数位 DP

[ABC208F] Cumulative Sum

拉格朗日插值法

[ABC209A] Counting

[ABC209B] Can you buy them all?

[ABC209C] Not Equal

组合数学

[ABC209D] Collision

[ABC209E] Shiritori

图论 · 图论建模

[ABC209F] Deforestation

动态规划 DP

[ABC210A] Cabbages

[ABC210B] Bouzu Mekuri

[ABC210C] Colorful Candies

[ABC210D] National Railway

[ABC210E] Ring MST

[ABC210F] Coprime Solitaire

2-SAT

[ABC211A] Blood Pressure

[ABC211B] Cycle Hit

[ABC211C] chokudai

[ABC211D] Number of Shortest paths

[ABC211E] Red Polyomino

搜索 · 状压 DP

[ABC211F] Rectilinear Polygons

[ABC212A] Alloy

[ABC212B] Weak Password

[ABC212C] Min Difference

[ABC212D] Querying Multiset

[ABC212E] Safety Journey

动态规划 DP

[ABC212F] Greedy Takahashi

[ABC212G] Power Pair

[ABC212H] Nim Counting

快速沃尔什变换 FWT · 集合幂级数，子集卷积

[ABC213A] Bitwise Exclusive Or

[ABC213B] Booby Prize

[ABC213C] Reorder Cards

[ABC213D] Takahashi Tour

[ABC213E] Stronger Takahashi

搜索 · 广度优先搜索 BFS

[ABC213F] Common Prefixes

后缀自动机 SAM · 后缀数组 SA · 后缀树

[ABC213G] Connectivity 2

动态规划 DP · 状态合并