Banknotes

Red-Blue Matrix

Arena

动态规划 DP · 组合数学 · 排列组合

Tree Queries

Linear Keyboard

Odd Grasshopper

Minimum Extraction

Blue-Red Permutation

Robot on the Board 1

Robot on the Board 2

深度优先搜索 DFS

Banquet Preparations 1

Banquet Preparations 2

Find Array

Build the Permutation

Game Master

图论建模 · 强连通分量

Dominoes

The Cells on the Paper

MEX counting

Alphabetic Tree

字符串 · 二分 · 树链剖分 · 哈希 hashing · 扫描线 · 后缀数组 SA

Divide and Multiply

贪心

William the Vigilant

Complex Market Analysis

Social Network

并查集

William The Oblivious

线段树 · 矩阵乘法

Interesting Sections

A Stroll Around the Matrix

Pushing Robots

Anti Light's Cell Guessing

Kalindrome Array

Keshi Is Throwing a Party

Not Quite Lee

AmShZ and G.O.A.T.

Mashtali: a Space Oddysey

AmShZ Wins a Bet

倍增 · 哈希 hashing

Squid Game

贪心

Mashtali vs AtCoder

Make Even

字符串 · 数学 · 构造

Team Composition: Programmers and Mathematicians

Polycarp Recovers the Permutation

Weights Assignment For Tree Edges

Escape The Maze (hard version)

Escape The Maze (easy version)

ATM and Students

线段树 · 二分

Robot and Candies

贪心 · Dilworth 定理

Distance

数学

Special Permutation

构造

Chat Ban

数学 · 二分

X-Magic Pair

数论 · 最大公约数 gcd

Messages

Armor and Weapons