[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

[ABC213H] Stroll

[ABC214A] New Generation ABC

[ABC214B] How many?

[ABC214C] Distribution

[ABC214D] Sum of Maximum Weights

并查集

[ABC214E] Packing Under Range Regulations

贪心 · 排序

[ABC214F] Substrings

动态规划 DP

[ABC214G] Three Permutations

动态规划 DP · 组合数学 · 容斥原理

[ABC214H] Collecting

[ABC215A] Your First Judge

[ABC215B] log2(N)

[ABC215C] One More aab aba baa

[ABC215D] Coprime 2

素数判断

[ABC215E] Chain Contestant

[ABC215F] Dist Max 2

[ABC215G] Colorful Candies 2

[ABC215H] Cabbage Master

[ABC216A] Signed Difficulty

[ABC216B] Same Name

[ABC216C] Many Balls

[ABC216D] Pair of Balls

[ABC216E] Amusement Park

[ABC216F] Max Sum Counting

动态规划 DP

[ABC216G] 01Sequence

贪心 · 树状数组 · 差分约束

[ABC216H] Random Robots

[ABC217A] Lexicographic Order