Minimize Inversions

XOR-distance

Blocking Elements

ace5 and Task Order

Caterpillar on a Tree

Permutation of Given

构造

Wallet Exchange

Plus-Minus Split

Grouping Increases

贪心

01 Tree

构造

Counting Prefixes

动态规划 DP · 欧拉回路

Wine Factory (Hard Version)

线段树

Wine Factory (Easy Version)

线段树 · 前缀和

Tree LGM

Tree Diameter

Satisfying Constraints

Summation Game

Partitioning the Array

枚举 · 最大公约数 gcd

Array Repetition

Counting Binary Strings

动态规划 DP

Smooth Sailing (Hard Version)

并查集 · Kruskal 重构树

Smooth Sailing (Easy Version)

广度优先搜索 BFS

Square

Arranging Cats

Sending Messages

Very Different Array

贪心

Eat the Chip

博弈论

Sum of Progression

根号分治

Mischievous Shooter

枚举 · 前缀和 · 差分

Tricky Template

Forming Triangles

枚举

Closest Cities

贪心 · 前缀和

Berserk Monsters

模拟

Increasing Subsequences

构造

Replace on Segment

动态规划 DP · 区间 DP

Moving Chips

贪心

Monsters Attack!

贪心 · 排序

Find B

前缀和 · 构造

Slimes

二分 · 前缀和

Count Paths

点分治 · 递归

Shrink-Reverse

后缀自动机 SAM · 哈希 hashing · 后缀数组 SA

Did We Get Everything Covered?

贪心

Space Harbour

线段树 · 树状数组

Fractal Origami

数学

Balanced Subsequences

组合数学 · Catalan 数

Paper Cutting Again

Anti-Proxy Attendance

We Got Everything Covered!

A Balanced Problemset?

Good Trip