New Year and the Acquaintance Estimation

New Year and the Mallard Expedition

New Year and the Factorisation Collaboration

New Year and the Tricolore Recreation

Uniform String

Teams Forming

Prefixes and Suffixes

Great Vova Wall (Version 2)

Great Vova Wall (Version 1)

Minimal Diameter Forest

Tree with Maximum Cost

动态规划 DP · 深度优先搜索 DFS · 树形 DP

Dice Rolling

Letters Rearranging

Mishka and the Last Exam

Beautiful Graph

Intersection of Permutations

Vasya and Array

Multidimensional Queries

线段树 · 枚举 · 进制

Repeating Cipher

Array Stabilization

Powers Of Two

Circular Dance

Almost Regular Bracket Sequence

Make It Connected

Find Divisible

Substring Removal

Polygon for the Angle

Easy Problem

The Top Scorer

Inversion Expectation

Lucky Tickets

组合数学 · 快速数论变换 NTT

Gennady and a Card Game

Petr and a Combination Lock

Yuhao and a Parenthesis

Makoto and a Blackboard

动态规划 DP · 期望

Egor and an RPG game

Alex and a TV Show

Vladislav and a Great Legend

背包 DP · 树形 DP · Stirling 数

Mateusz and an Infinite Sequence

Sum in the tree

Nice table

Construct a tree

Eels

Fedya the Potter

Ж-function

点分治 · 后缀自动机 SAM · 树链剖分

Snowball

Squares and Segments

Postcard

Cookies

动态规划 DP · 贪心 · 线段树 · 二分 · 树状数组 · 树形 DP

Roman and Browser

枚举