[ARC226A] Meeting Division

贪心 · 排序

[ARC226B] Bin-ary Packing

贪心 · 二分 · 进制

[ARC226C] Square Corner Packing

[ARC226D] Penta-Queue

[ARC226E] Cellular Messenger

[ARC227A] Fermat Point of Binary Strings

数学 · 贪心

[ARC227B] Know Your Place

平衡树 · 树状数组 · 栈

[ARC227C] Follow the Letters

[ARC227D] Median of Binary Strings

[ARC227E] Shift and XOR Switches

[ARC227F] Erase and Raise

动态规划 DP

[ARC228A] Row and Col swap

动态规划 DP

[ARC228B] Minimize Topological Order

贪心 · 线段树 · 单调栈

[ARC228C] Partially Sort

[ARC228D] Amidakuji 2

[ARC228E] Pair of Permutations

[ARC229A] AtCoder Reverse Contest

[ARC229B] Halving Subtraction

数学 · 贪心

[ARC229C] Sum of Average 2

贪心

[ARC229D] Nim_k ?

博弈论

[ARC229E] Taka and Hashi

并查集 · 广度优先搜索 BFS

[ARC229F] Angst for All Pairs 2

构造

[ARC230A] Meeting on Tree

[ARC230B] Chmax and Chmin

[ARC230C] Buildings

笛卡尔树

[ARC230D] Min Max Matrix

[ARC230E] Minister

[ARC231A] Two Dimensional Invader

动态规划 DP

[ARC231B] Three Mex

构造 · Ad-hoc

[ARC231C] One Sky, Many Stars

分类讨论

[ARC231D] Choose Your Role

博弈论

[ARC231E] Odd Inversion

Ad-hoc

[ARC231F] Two Unbalanced Subtrees

[ARC232A] Two in the Range

并查集 · 差分约束

[ARC232B] Two Flips

广度优先搜索 BFS · 图论建模 · 最短路

[ARC232C] All Add or Single Negate

图论建模 · 二分图

[ARC232D] Delete Different

[ARC232E] Doubling

魔法使い高橋君

圧縮

グラフ

图论 · 生成树

ストラックアウト

动态规划 DP · 单调队列

迷子の高橋君

期望

数字列をカンマで分ける問題

Colorful MST

图论 · 生成树 · 构造

Many Swaps Sorting

排序 · 构造

Paired Parentheses

Ancient Tree Record

Black Cats Deployment

Unicyclic Graph Counting