A New Technique

Perform Easily

Shurikens

Solo mid Oracle

Roads and Ramen

Prison Break

Repainting Street

Bouncing Ball

XOR-gun

New Game Plus!

Cakes for Clones

k-Amazing Numbers

Make Them Equal

XOR Inverse

树形 DP · 字典树 Trie

Graph and Queries

Split

Showing Off

Copy-paste

Two Arrays

Buying Torches

Negative Prefixes

Mortal Kombat Tower

Trash Problem

模拟 · 平衡树

Expected Damage

Equal Product

Three Occurrences

线段树 · 可持久化线段树 · 哈希 hashing · 前缀和 · 分块 · 双指针 two-pointer

Digit Game

Stairs

Killjoy

Sage's Birthday (hard version)

Sage's Birthday (easy version)

Decryption

Rain of Fire

二分 · 并查集 · 离散化 · 枚举 · 分类讨论

Cubes Sorting

Rock and Lever

Pokémon Army (hard version)

贪心 · 线段树

Pokémon Army (easy version)

Rescue Nibel!

Battle Lemmings

XORwice

Putting Bricks in the Wall

Palindromifier

Hexagons

Swedish Heroes

Fence

Nice Matrix

Bargain

数学

Returning Home

最短路

Minlexes

Boring Queries