Cycling City

dfs and similar, graphs

Similar Polynomials

combinatorics, math

Zigu Zagu

constructive algorithms, data structures, greedy

Omkar and Akmar

chinese remainder theorem, combinatorics, constructive algorithms, fft, games, geometry, math, meet-in-the-middle, string suffix structures

Snake

bitmasks, dfs and similar, graphs, implementation

Bring Balance

brute force, constructive algorithms, greedy

Narrow Components

brute force, data structures, dp, dsu, math, trees

Aquarium decoration

data structures, greedy, two pointers

Choosing Ads

data structures

Cards

constructive algorithms, implementation

Подкрутка II

*special problem, dp

Merge Equal Elements

constructive algorithms, data structures

Financiers Game

dp

Hostname Aliases

*special problem, binary search, data structures, implementation, sortings, strings

Radio Stations

2-sat

Graph Traveler

brute force, data structures, dfs and similar, dp, graphs, implementation, math, number theory

Cookies

binary search, data structures, dfs and similar, dp, games, trees

Eyes Closed

data structures, probabilities

Binary Blocks

brute force

Choosing Subtree is Fun

binary search, data structures, dfs and similar, trees, two pointers

Minimum Sum

divide and conquer, geometry, sortings

Excitation of Atoms

greedy, implementation

Arthur and Questions

greedy, implementation, math, ternary search

Guard Towers

binary search, dsu, geometry, graphs, sortings

Blueprint for Seating

combinatorics, divide and conquer, math

K-Set Tree

combinatorics, dfs and similar, dp, math, trees

Similar Sets

data structures, graphs, implementation

Population Size

greedy, implementation, math

Strange Set

flows, math

Boboniu and String

binary search, geometry, ternary search

Vladik and chat

brute force, constructive algorithms, dp, implementation, strings

Guess the Tree

bitmasks, constructive algorithms, dp, greedy, trees

The Chocolate Spree

dfs and similar, dp, graphs, trees

Dead Ends

bitmasks, dp

Nullify The Matrix

constructive algorithms, games

Reading Books (hard version)

data structures, greedy, implementation, sortings, ternary search, two pointers

Chemistry Experiment

binary search, data structures, ternary search

Help Caretaker

brute force, dp

Hobbits' Party

constructive algorithms, greedy

Double Sort II

dfs and similar, flows, graph matchings, graphs

Magnets

binary search, constructive algorithms, interactive

Morse Code

binary search, data structures, dp, hashing, sortings, string suffix structures, strings

End of Exams

greedy

Daleks' Invasion (medium)

dfs and similar, graphs, shortest paths, trees

Guard Duty (medium)

binary search, dp, greedy, sortings

Turtle

dp, implementation

Fools and Foolproof Roads

data structures, dfs and similar, dsu, graphs, greedy

Lottery

binary search, brute force, greedy, math, two pointers

Vasya and Maximum Matching

dp, trees

Sum the Fibonacci

bitmasks, divide and conquer, dp, fft, math

Mathematician Takeover

binary search, dfs and similar, math

Choose Place

Huge Strings

bitmasks, brute force, dp, implementation, strings

In Search of Truth (Hard Version)

constructive algorithms, interactive, math, meet-in-the-middle, probabilities

Mercenaries

bitmasks, brute force, combinatorics, dp, dsu, math, two pointers

Shaass the Great

dp, trees

One-Based Arithmetic

brute force, dfs and similar, divide and conquer

Matrix Problem

flows, graphs

Ela Goes Hiking

combinatorics, dp, math, probabilities

Mysterious numbers - 2

*special problem

Скрытый друг

*special problem

Sonya and Matrix Beauty

strings

Construct Tree

bitmasks, constructive algorithms, dp, trees

Planting Trees

constructive algorithms

The Most Reckless Defense

bitmasks, brute force, constructive algorithms, dp, flows, graph matchings, shortest paths

Tournament

data structures, graphs

Tower of Hanoi

dp

Carpeting the Room

*special problem, implementation

Mother of Dragons

brute force, graphs, math, meet-in-the-middle

The Last Fight Between Human and AI

math

Sereja and Two Sequences

data structures, dp

Points

combinatorics, data structures, implementation, math, matrices

Brain Network (hard)

trees

Students' Revenge

data structures, greedy, sortings

Dependency management

*special problem, graphs, implementation

Trees and XOR Queries Again

data structures, dfs and similar, divide and conquer, graphs, implementation, math, trees

Ace It!

*special problem

Graph Reconstruction

constructive algorithms

Doremy's Experimental Tree

brute force, constructive algorithms, dfs and similar, dsu, sortings, trees

Machine Programming

flows, graphs

Likes Display

*special problem, implementation

Death Stars (medium)

hashing, strings

Building Bridge

geometry, ternary search, two pointers

Flow Control

dfs and similar, dp, greedy, trees

Palindrome Partition

dp, string suffix structures, strings

Game with Strings

bitmasks, dp, probabilities

Programming Language

binary search, brute force, expression parsing, implementation

New Year Garland

combinatorics, dp

Doremy's Drying Plan (Hard Version)

data structures, dp

Matching Names

dfs and similar, strings, trees

Cutlet

data structures, dp

Smooth Sailing (Easy Version)

binary search, brute force, data structures, dfs and similar, dsu, graphs, shortest paths

Regular Forestation

hashing, trees

Inverse of Rows and Columns

brute force, constructive algorithms

NN country

binary search, data structures, trees

Lucky Number Representation

constructive algorithms, dfs and similar, dp

Construct a tree

binary search, constructive algorithms, dfs and similar, graphs, greedy, trees

Run for beer

dfs and similar, shortest paths

Vasya and Big Integers

binary search, data structures, dp, hashing, strings

Tree Factory

constructive algorithms, greedy, trees