[ABC254F] Rectangle GCD

线段树 · 数论 · 最大公约数 gcd · ST 表

[ABC254G] Elevators

线段树 · 倍增

[ABC254Ex] Multiply or Divide by 2

[ABC255A] You should output ARC, though this is ABC.

[ABC255B] Light It Up

[ABC255C] ±1 Operation 1

[ABC255D] ±1 Operation 2

二分 · 排序 · 前缀和

[ABC255E] Lucky Numbers

枚举

[ABC255F] Pre-order and In-order

图论 · 深度优先搜索 DFS

[ABC255G] Constrained Nim

博弈论 · SG 函数

[ABC255Ex] Range Harvest Query

[ABC256A] 2^N

[ABC256B] Batters

[ABC256C] Filling 3x3 array

[ABC256D] Union of Interval

[ABC256E] Takahashi's Anguish

图论 · Tarjan

[ABC256F] Cumulative Cumulative Cumulative Sum

线段树

[ABC256G] Black and White Stones

动态规划 DP · 矩阵加速 · 组合数学 · 矩阵乘法

[ABC256Ex] I like Query Problem

线段树 · 颜色段均摊（珂朵莉树 ODT）

[ABC257A] A to Z String 2

[ABC257B] 1D Pawn

[ABC257C] Robot Takahashi

[ABC257D] Jumping Takahashi 2

[ABC257E] Addition and Multiplication 2

贪心 · 枚举

[ABC257F] Teleporter Setting

图论 · 最短路

[ABC257G] Prefix Concatenation

字符串 · 动态规划 DP · 广度优先搜索 BFS · 动态规划优化 · 图论建模

[ABC257Ex] Dice Sum 2

[ABC258A] When?

[ABC258B] Number Box

[ABC258C] Rotation

[ABC258D] Trophy

[ABC258E] Packing Potatoes

模拟

[ABC258F] Main Street

[ABC258G] Triangle

[ABC258Ex] Odd Steps

[ABC259A] Growth Record

[ABC259B] Counterclockwise Rotation

[ABC259C] XX to XXX

[ABC259D] Circumferences

图论 · 并查集 · 深度优先搜索 DFS · 图论建模

[ABC259E] LCM on Whiteboard

[ABC259F] Select Edges

动态规划 DP · 树形 DP

[ABC259G] Grid Card Game

[ABC259Ex] Yet Another Path Counting

[ABC260A] A Unique Letter

[ABC260B] Better Students Are Needed!

[ABC260C] Changing Jewels

[ABC260D] Draw Your Cards

[ABC260E] At Least One

[ABC260F] Find 4-cycle

[ABC260G] Scalene Triangle Area