Yaroslav and Time

binary search, graphs, shortest paths

The Queue

brute force, greedy

Random Task

binary search, bitmasks, combinatorics, dp, math

The Holmes Children

math, number theory

Towers

dp, greedy, two pointers

Spaceship Solitaire

data structures, greedy, implementation

Cut Substrings

combinatorics, dp, hashing, strings, two pointers

Information Graph

dfs and similar, dsu, graphs, trees

Apple Tree

dfs and similar, number theory, trees

The way home

binary search, data structures, dp, graphs, greedy, shortest paths, sortings

Maximal Area Quadrilateral

brute force, geometry

Lengthening Sticks

combinatorics, implementation, math

Infinite Inversions

binary search, data structures, implementation, sortings, trees

Permutation Sorting

data structures, sortings

Lipshitz Sequence

data structures, math

Messenger

data structures, hashing, implementation, string suffix structures, strings

Time to Raid Cowavans

brute force, data structures, sortings

Check Transcription

brute force, data structures, hashing, strings

Post Lamps

brute force, greedy

Arpa and a list of numbers

implementation, number theory

Field expansion

brute force, dp, meet-in-the-middle

Assimilation IV

combinatorics, dp, math, probabilities, two pointers

Down or Right

constructive algorithms, interactive, matrices

Fishes

data structures, graphs, greedy, probabilities, shortest paths

Another Wine Tasting Event

combinatorics, constructive algorithms, math, strings

National Property

2-sat, dfs and similar, graphs, implementation

Solo mid Oracle

greedy, math, ternary search

Vlad and the Nice Paths (easy version)

combinatorics, dp, math

Lucky Subsequence

combinatorics, dp, math

Compress String

dp, strings

Inverse Coloring

combinatorics, dp, math

Characteristics of Rectangles

binary search, bitmasks, brute force, implementation, sortings

Congruence Equation

chinese remainder theorem, math, number theory

Santa Claus and a Palindrome

constructive algorithms, data structures, greedy

Dispute

dfs and similar, graphs, greedy

Two Pizzas

bitmasks, brute force

Digits

dp, math, number theory

Transitive Graph

dfs and similar, dp, dsu, graphs, implementation

Degenerate Matrix

binary search, math

Addition Robot

data structures, math, matrices

Topforces Strikes Back

brute force, math, sortings

Yet another 2D Walking

dp

Broken BST

data structures, dfs and similar

Destroy it!

dp, implementation, sortings

Key Storage

combinatorics, math

Is It Flower?

dfs and similar, graphs, implementation

GukiZ and Binary Operations

combinatorics, implementation, math, matrices, number theory

Order book

combinatorics, data structures, greedy

Chip 'n Dale Rescue Rangers

binary search, geometry, math

Permutation recovery

constructive algorithms, data structures, dfs and similar, graphs, greedy, math, sortings

Full Binary Tree Queries

brute force, implementation, trees

Colorful Points

data structures, greedy, implementation

Light Bulbs (Easy Version)

brute force, combinatorics, dfs and similar, dp, dsu, graphs, math, trees

Greg and Friends

combinatorics, dp, graphs, shortest paths

Substitutes in Number

dp

Desk Disorder

combinatorics, dfs and similar, dsu, graphs, trees

Distributing Parts

greedy, sortings

DNA Evolution

data structures, strings

Berland and the Shortest Paths

brute force, dfs and similar, graphs, shortest paths

Flawed Flow

constructive algorithms, flows, graphs, greedy

Special Matrices

combinatorics, dp

Nastya and a Game

brute force, implementation, math

Beard Graph

data structures, dsu, trees

Chris and Road

geometry, implementation

Presents in Bankopolis

dp, graphs, shortest paths

Sockets

greedy, sortings

Letters Removing

data structures, strings

Invariance of Tree

constructive algorithms, dfs and similar, greedy, trees

Little Girl and Problem on Trees

data structures, graphs, trees

Cactus

data structures, dfs and similar, dp, graphs, trees

Cubes

games, greedy, implementation

Vladik and Favorite Game

constructive algorithms, dfs and similar, graphs, interactive

Happy Sets

combinatorics

Changing a String

dp

Follow Traffic Rules

implementation, math

Vasya's Function

binary search, implementation, math

Grouped Carriages

binary search, data structures, dp, flows, greedy

Tesla

constructive algorithms, implementation

Careful Maneuvering

bitmasks, brute force, geometry

Devu and Birthday Celebration

combinatorics, dp, math

The Unbearable Lightness of Weights

dp, math

Nice table

brute force, constructive algorithms, greedy, math

Santa Claus and Tangerines

binary search, data structures, greedy, two pointers

Counter Attack

data structures, dsu, graphs, hashing, sortings

Ilya and Roads

dp

Okabe and El Psy Kongroo

dp, matrices

Vanya and Brackets

brute force, dp, expression parsing, greedy, implementation, strings

Magic Trick

combinatorics, math, probabilities

Mahmoud and Ehab and the function

binary search, data structures, sortings

Boredom

data structures

Caisa and Tree

brute force, dfs and similar, math, number theory, trees

Yet Another Number Game

dp, games

Duff in Beach

dp

Performance Review

data structures

Below the Diagonal

constructive algorithms, greedy, math

Village (Minimum)

*special problem, dp, greedy, trees

Black and White Tree

constructive algorithms, dsu, graphs, greedy, trees

New Roads

constructive algorithms, graphs, trees

Job Lookup

constructive algorithms, dp, shortest paths, trees

Trip to Saint Petersburg

data structures