The Tree Has Fallen!

Maximizing Root

数学 · 贪心 · 树形 DP · 最大公约数 gcd

Hall of Fame

MKnez's ConstructiveForces Task

Least Prefix Sum

Boris and His Amazing Haircut

Anya's Simultaneous Exhibition

强连通分量

Xorcerer's Stones

背包 DP · 树形 DP

The Game of the Century

Olympic Team Building

Hayato and School

构造

GCD Partition

最大公约数 gcd · 前缀和

Bit Guessing Game

位运算 · 构造

Josuke and Complete Graph

数论 · 最大公约数 gcd

Three Chairs

最大公约数 gcd · 莫比乌斯反演 · 前缀和

Delicious Dessert

后缀自动机 SAM

Parallel Projection

Going to the Cinema

Equal Frequencies

Many Perfect Squares

数学

Rectangle Shrinking

贪心 · 构造

Bracket Insertion

动态规划 DP · 组合数学 · 前缀和 · 概率论

Diverse Coloring

Window Signals (hard version)

Window Signals (easy version)

Make it Beautiful

Matrix of Differences

Yet Another Tournament

Different Arrays

Game of the Year

数学 · 贪心 · 树状数组 · 数论 · 前缀和 · ST 表

Double Sort II

网络流 · 二分图

Weighed Tree Radius

Monsters (easy version)

贪心

Letter Exchange

Monsters (hard version)

贪心 · 线段树

Wooden Spoon

动态规划 DP · 数学 · 组合数学

Infinite Game

动态规划 DP · DP 套 DP

Minimums or Medians

Alternating Deck (hard version)

Non-alternating Deck (easy version)

Cake Assembly Line

Exponential Equation

Number Factorization

Remove the Bracket

Game on Axis

The Harmonization of XOR

位运算 · 构造

Inverse Transformation

Colorful Tree Again

Codeforces Scoreboard

Treasure Hunt