[ABC251D] At Most 3 (Contestant ver.)

构造

[ABC251E] Takahashi and Animals

动态规划 DP

[ABC251F] Two Spanning Trees

图论 · 广度优先搜索 BFS · 深度优先搜索 DFS · 生成树 · 构造

[ABC251G] Intersection of Polygons

[ABC251Ex] Fill Triangle

[ABC252A] ASCII code

[ABC252B] Takahashi's Failure

[ABC252C] Slot Strategy

[ABC252D] Distinct Trio

[ABC252E] Road Reduction

图论 · 最短路 · 生成树

[ABC252F] Bread

贪心

[ABC252G] Pre-Order

动态规划 DP · 区间 DP

[ABC252Ex] K-th beautiful Necklace

[ABC253A] Median?

[ABC253B] Distance Between Tokens

[ABC253C] Max - Min Query

[ABC253D] FizzBuzz Sum Hard

[ABC253E] Distance Sequence

动态规划 DP · 前缀和

[ABC253F] Operations on a Matrix

线段树 · 树状数组

[ABC253G] Swap Many Times

[ABC253Ex] We Love Forest

集合幂级数，子集卷积 · 状压 DP

[ABC254A] Last Two Digits

[ABC254B] Practical Computing

[ABC254C] K Swap

[ABC254D] Together Square

[ABC254E] Small d and k

图论 · 枚举

[ABC254F] Rectangle GCD

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

[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

[ABC256Ex] I like Query Problem

[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