Ant on the Tree

constructive algorithms, dfs and similar, trees

Mail Stamps

data structures, dfs and similar, graphs, implementation

DravDe saves the world

geometry, math

Don't fear, DravDe is kind

binary search, data structures, dp, hashing

Bath Queue

combinatorics, dp, probabilities

pSort

dfs and similar, dsu, graphs

Bender Problem

implementation

Number With The Given Amount Of Divisors

brute force, dp, number theory

Ring Road 2

2-sat, dfs and similar, dsu, graphs

Unordered Subsequence

constructive algorithms, greedy

Multithreading

constructive algorithms

Tickets

combinatorics, math, probabilities

Parquet

combinatorics, constructive algorithms, greedy, implementation

Test

hashing, strings

Roads not only in Berland

dsu, graphs, trees

Roads in Berland

graphs, shortest paths

Berland collider

binary search

Broken robot

dp, math, probabilities

Sequence of points

geometry, implementation, math

Tree

dp

Tetragon

geometry, math

Oranges and Apples

constructive algorithms, sortings

Party

constructive algorithms, graphs, math

Scheme

dfs and similar, graphs, trees

Segments

greedy, sortings

System Administrator

graphs

Traveling Graph

bitmasks, graph matchings, graphs

Stripe 2

binary search, dp, sortings

Intersection

implementation, math

Jabber ID

implementation, strings

Dijkstra?

graphs, shortest paths

Equation

math

BerOS file system

implementation

Fairy

dfs and similar, divide and conquer, dsu

Points

data structures

Deletion of Repeats

greedy, hashing, string suffix structures

Checkout Assistant

dp

Flag 2

dp

Seller Bob

brute force, dp, greedy

Platforms

brute force, math

Palisection

strings

Notepad

number theory

Balance

dp

Fish

bitmasks, dp, probabilities

Logging

implementation, strings

Monitor

binary search, number theory

Triangles

combinatorics, dp

Map

data structures, implementation, sortings

Industrial Nim

games

Laser

math

Camels

dp

Two Paths

dfs and similar, dp, graphs, shortest paths, trees, two pointers

Four Segments

brute force, constructive algorithms, geometry, implementation, math

Holes

data structures, dsu

Triangles

dp, geometry

Sequence

dp, sortings

Letter A

geometry, implementation

Start of the session

constructive algorithms

Ball

data structures, sortings

Forward, march!

binary search, dp, greedy

A Simple Task

bitmasks, dp, graphs

How Many Squares?

implementation

Jumping Jack

math

Greedy Change

constructive algorithms

LCIS

dp

Digital Root

number theory

Interestring graph and Apples

dfs and similar, dsu, graphs

How many trees?

combinatorics, divide and conquer, dp

Beads

dp, graphs

Two Friends

binary search, geometry

Looking for Order

bitmasks, dp

Defining Macros

dp, expression parsing, implementation

Palindrome Degree

hashing, strings

Line

math, number theory

Memory Manager

implementation

Exposition

binary search, data structures, dsu, trees, two pointers

Lizards and Basements 2

brute force, dp

Bindian Signalizing

data structures

Follow Traffic Rules

implementation, math

Longest Regular Bracket Sequence

constructive algorithms, data structures, dp, greedy, sortings, strings

Mysterious Present

dp, sortings

Least Cost Bracket Sequence

greedy

Tic-tac-toe

brute force, games, implementation

Lorry

greedy, sortings

Commentator problem

geometry

The least round way

dp, math

Ancient Berland Circus

geometry, math

Spreadsheet

implementation, math