Blocking Chips

Removal Sequences

Typical Interview Problem

Asterisk-Minor Template

Maximum Set

Maximum Subarray

Colored Subgraphs

贪心 · 树形 DP

Strange Triples

Li Hua and Maze

Li Hua and Pattern

Li Hua and Chess

数学 · 贪心 · 构造

Li Hua and Tree

Li Hua and Array

线段树 · 数论 · 最近公共祖先 LCA · 素数判断,质数,筛法 · 欧拉函数

Li Hua and Path

树状数组 · Kruskal 重构树

Showstopper

Three Sevens

Candy Store

Shocking Arrangement

Multitest Generator

Gifts from Grandfather Ahmed

Recent Actions

Equalize by Divide

Double Lexicographically Minimum

Hot Start Up (hard version)

动态规划 DP · 线段树

Hot Start Up (easy version)

动态规划 DP

City Union

贪心 · 并查集 · 构造

Halve or Subtract

贪心 · 堆 · 网络流

Count Voting

动态规划 DP · 组合数学 · 容斥原理

Tree Cutting

Is It a Cat?

Count the Number of Pairs

Powering the Hero (hard version)

Powering the Hero (easy version)

Remove Two Letters

Unforgivable Curse (hard version)

Unforgivable Curse (easy version)

Dasha and Nightmares

Symmetree

The Very Beautiful Blanket

构造

Buying gifts

贪心

Music Festival

动态规划 DP · 树状数组

The way home

动态规划 DP · 最短路

Gasoline prices

倍增 · 并查集

Another n-dimensional chocolate bar

动态规划 DP · 数学

A task for substrings

线段树 · 二分 · AC 自动机

Likes

Settlement of Guinea Pigs

Lame King

Vaccination

Pull Your Luck