Vlad and the Best of Five

Vlad and Shapes

Vlad and a Sum of Sum of Digits

Vlad and Division

Vlad and an Odd Ordering

Vlad and Avoiding X

Vlad and Trouble at MIT

树形 DP

Make it White

Following the String

Choose the Different Ones!

贪心

Find the Different Ones!

二分

Klever Permutation

构造

Microcycle

并查集 · 深度优先搜索 DFS · 生成树

Paint Charges

动态规划 DP

Rectangle Cutting

Equalize

排序 · 双指针 two-pointer

Physical Education Lesson

数学

Lonely Mountain Dungeons

Modular Sequence

动态规划 DP · 贪心

Digital Patterns

线段树

Sasha and the Beautiful Array

Sasha and the Drawing

Sasha and the Casino

Sasha and a Walk in the City

动态规划 DP · 树形 DP

Sasha and the Happy Tree Cutting

树状数组 · 虚树 · 状压 DP

Sasha and the Wedding Binary Search Tree

组合数学 · 逆元

Maximise The Score

贪心

Permutation Printing

数学 · 构造

Lexicographically Largest

贪心

Sum over all Substrings (Hard Version)

动态规划 DP

Sum over all Substrings (Easy Version)

贪心

2..3...4.... Wonderful! Wonderful!

组合数学 · 排列组合

Maximize the Difference

剪枝 · 记忆化搜索 · 字典树 Trie · 位运算

Prefix Max Set Counting

Interactive Mex Tree

Counting Is Fun

Recovering a Small String

Make Equal

前缀和

Make Equal Again

Divisible Pairs

Anna and the Valentine's Day Gift

贪心

Chat Screenshots

模拟 · 图论建模 · 拓扑排序

One-Dimensional Puzzle

组合数学 · 分类讨论

Thorns and Coins

递推

Chaya Calendar

数论

LR-remainders

栈

Card Game

模拟 · 贪心

Final Countdown

数学 · 高精度

Feed Cats

动态规划 DP · 差分

Moving Platforms

最短路 · 扩展欧几里德算法