Road Construction

Single Push

Silly Mistake

Sweets Eating

Harmonious Graph

并查集

Antenna Coverage

Cheap Robot

倍增 · Kruskal 重构树 · 最短路 · 生成树 · 最近公共祖先 LCA

Feeding Chicken

Send Boxes to Alice (Hard Version)

Send Boxes to Alice (Easy Version)

Point Ordering

Tree Queries

Send Tree to Charlie

Changing Volume

Fridge Lockers

League of Leesins

Payment Without Change

Minimize the Permutation

Platforms Jumping

Binary String Minimizing

Yet Another Division Into Teams

动态规划 DP · 贪心

Equalizing Two Strings

Two Rival Students

Magic Stick

Dominated Subarray

Yet Another Monster Killing Problem

The Contest

Make Them Similar

Divisor Set

Heating

Obtain Two Zeroes

Infinite Fence

A Game with Traps

贪心 · 二分 · 并查集 · 差分

Tournament

贪心 · 线段树 · 堆

Colored Tree

Xor-Set

Sweet Problem

PIN Codes

Everyone is a Winner!

Secret Passwords

Editor

Economic Difficulties

Beautiful Regional Contest

Beautiful Sequence

Beautiful Mirrors with queries

动态规划 DP · 线段树 · 前缀和 · 期望 · 矩阵乘法

Beautiful Bracket Sequence (hard version)

组合数学 · 排列组合

Beautiful Bracket Sequence (easy version)

组合数学 · 排列组合

Beautiful League

Beautiful Fibonacci Problem

构造

Beautiful String