Insert and Equalize

Robot Queries

Collapsing Strings

字符串 · 字典树 Trie

Trees and XOR Queries Again

Halloumi Boxes

StORage room

Theofanis' Nightmare

Maximum And Queries (hard version)

Maximum And Queries (easy version)

Geo Game

Babysitting

线段树 · 2-SAT

Forked!

Collecting Game

Array Game

Set To Max (Hard Version)

贪心 · 线段树 · ST 表 · 单调栈

Set To Max (Easy Version)

贪心

Tree Queries

线段树 · 树的遍历

Beautiful Tree

倍增 · 强连通分量 · Tarjan · 最近公共祖先 LCA

Constructive Problems

Begginer's Zelda

Largest Subsequence

Cyclic MEX

线段树 · 二分 · 单调队列

One-X

递推 · 线段树

Field Should Not Be Empty

枚举

Easy As ABC

枚举

Button Pressing

前缀和

Cursed Game

Spaceship Exploration

计算几何 · 凸包

Merge Not Sort

Maximize The Value

线段树

Grid Game 2

博弈论 · 最大公约数 gcd

Twin Friends

动态规划 DP · 组合数学

Contingency Plan 2

二分图

Count BFS Graph

动态规划 DP · 组合数学

Deck-Building Game

快速沃尔什变换 FWT

Palindromic Parentheses

构造

Triangle Construction

Rook

YetnotherrokenKeoard

模拟

Removal of Unattractive Pairs

Jumping Through Segments

二分

Good Triples

Shift and Reverse

Lights

Distinct Buttons

Make Almost Equal With Mod

Heavy Intervals

贪心

Split Plus K

最大公约数 gcd

Multiple Lamps

枚举

Small Permutation Problem (Hard Version)

动态规划 DP