Minimize Inversions Number

树状数组

Reverse

Odd Swap Sort

Inversion Graph

Big Brush

Colorful Operations

线段树 · 颜色段均摊（珂朵莉树 ODT） · 吉司机线段树 segment tree beats

Two Posters

Great Sequence

模拟 · 贪心 · 排序

Repetitions Decoding

排序 · 构造

Anonymity Is Important

线段树 · 二分

Two Arrays

Special Positions

Covering Circle

Hard Way

计算几何

Power Walking

贪心

Doors and Keys

模拟 · 字符串 · 栈

Anti-Fibonacci Permutation

Increase Subarray Sums

Cross Coloring

Expand the Path

Basis

Stirling 数 · 快速数论变换 NTT

Square Counting

Quality vs Quantity

Factorials and Powers of Two

Weight the Tree

树形 DP

Power Board

数论

Playing Around the Table

Madoka and Math Dad

Madoka and the Elegant Gift

Madoka and Childish Pranks

Madoka and the Best School in Russia

Madoka and the Sixth-graders

Madoka and Laziness

Weird Sum

Integral Array

Tyler and Strings

树状数组 · 组合数学

Serious Business

动态规划 DP · 线段树 · 动态规划优化

Air Reform

生成树

Two Avenues

Game

Game of Ball Passing

Deletions of Two Adjacent Letters

DIV + MOD

Weight of the System of Nested Segments

Twist the Permutation

Rescheduling the Exam

二分 · 枚举 · 背包 DP

Vitaly and Advanced Useless Algorithms

动态规划 DP · 背包 DP

Counting Shortcuts

动态规划 DP · 图论

Playoff

Prove Him Wrong