Long Way to be Non-decreasing

图论 · 二分 · 基环树

Again Counting Arrays (Hard Version)

Again Counting Arrays (Easy Version)

Next and Prev

Maximize?

数学

Prefiquence

双指针 two-pointer

Assembly via Remainders

数学

Permutation Game

搜索 · 贪心

Cells Arrangement

数学 · 构造

Equal XOR Segments

贪心 · 位运算

Division + LCP (hard version)

二分 · 哈希 hashing · 后缀数组 SA · Z 函数

Division + LCP (easy version)

二分 · 哈希 hashing

Two Friends

模拟

Shifts and Sorting

贪心

Minimizing the Sum

动态规划 DP · 区间 DP

Shop Game

贪心 · 堆

Unique Array

贪心 · 线段树

Card Pairing

动态规划 DP

Balanced Unshuffle (Hard)

树形数据结构

Balanced Unshuffle (Medium)

Balanced Shuffle (Easy)

模拟 · 前缀和

Exact Neighbours (Hard)

构造

Exact Neighbours (Medium)

构造

Exact Neighbours (Easy)

构造

Game on Tree (Hard)

博弈论 · 树形 DP

Game on Tree (Medium)

博弈论 · 树形 DP

Game on Tree (Easy)

博弈论

Arithmancy (Hard)

构造

Arithmancy (Medium)

随机化

Arithmancy (Easy)

随机化

Trails (Hard)

动态规划 DP · 矩阵加速

Trails (Medium)

动态规划 DP · 矩阵加速

Trails (Easy)

动态规划 DP

Playing Quidditch (Hard)

模拟

Playing Quidditch (Medium)

模拟

Playing Quidditch (Easy)

模拟

Min-Fund Prison (Hard)

树形 DP · Tarjan · 双连通分量 · bitset

Min-Fund Prison (Medium)

树形 DP

Min-Fund Prison (Easy)

树形 DP

My First Sorting Problem

模拟

Different String

模拟

Clock and Strings

枚举

Binary Cut

贪心

Find the Car

二分

Circle Perimeter

数学

XOUR

贪心 · 堆 · 位运算

±1

2-SAT

Contest Proposal

贪心

Coin Games

贪心

Chess For Three

数学