Equal or Not Equal

Triangles on a Rectangle

BA-String

Exact Change

贪心 · 枚举 · 分类讨论

Replace the Numbers

Bipartite Array

Subsequences Galore

Stable Arrangement of Rooks

Integers Shop

贪心

Hidden Permutations

The Winter Hike

New School

Strange Instructions

Weighted Increasing Subsequences

动态规划 DP · 树状数组

Trains and Airplanes

Two Sequences

Construct a Rectangle

Berland Music

Set or Decrease

Shuffle

组合数学 · 差分

Math Test

贪心 · 状态合并

Quadratic Set

数学 · 数论 · 哈希 hashing · 构造 · 哈希表

Robot Cleaner

Game on Ranges

Balanced Stone Heaps

贪心 · 二分

Robot Cleaner Revisit

Middle Duplication

贪心 · 树形数据结构

Plus One on the Subset

Make AP

Division by Two and Permutation

枚举

Palindromes Coloring

Masha-forgetful

Interacdive Problem

MinOr Tree

生成树 · 位运算

Ancient Civilization

Elementary Particles

Road Optimization

Binary Spiders

Cats on the Upgrade (easy version)

Cats on the Upgrade (hard version)

Equidistant Letters

Minor Reduction

Monsters And Spells

Martial Arts Tournament

Black and White Tree

A Random Code Problem

动态规划 DP · 状态合并 · 组合数学

Not Shading

Not Sitting

贪心

Not Assigning

构造

Not Adding

数学 · 数论 · 枚举