Maximizing Root

dfs and similar, dp, graphs, math, number theory, trees

The Tree Has Fallen!

bitmasks, dfs and similar, math, trees

Flexible String Revisit

combinatorics, dp, math, probabilities

Flexible String

bitmasks, brute force, strings

Comfortably Numb

bitmasks, data structures, divide and conquer, strings, trees

Edge Reverse

binary search, dfs and similar, graphs, trees

Score of a Tree

bitmasks, combinatorics, dfs and similar, dp, math, probabilities, trees

Quiz Master

binary search, math, number theory, sortings, two pointers

Count Permutations

math

Parmigiana With Seafood

binary search, dp, greedy, trees

Controllers

binary search, math

Uniform Chemistry

dp, math

Italian Data Centers

graphs, shortest paths

Spinach Pizza

games, geometry, greedy, interactive

Another Wine Tasting Event

combinatorics, constructive algorithms, math, strings

Train Splitting

constructive algorithms, graphs, greedy

Crossing the Railways

data structures, dp

Teamwork

constructive algorithms, greedy, math

Library game

games, greedy, interactive, sortings

Vittorio Plays with LEGO Bricks

dp, geometry

Laboratory on Pluto

constructive algorithms, dp, greedy, math

The Human Equation

greedy, implementation

Friendly Spiders

dfs and similar, graphs, math, number theory, shortest paths

Interesting Sequence

bitmasks, math

Maximum Permutation

constructive algorithms

Segment Covering

brute force, combinatorics, constructive algorithms, data structures, dp, trees

Magician and Pigs (Hard Version)

binary search, brute force, data structures, implementation

Magician and Pigs (Easy Version)

brute force, data structures, implementation

Two Chess Pieces

dfs and similar, dp, greedy, trees

Same Count One

brute force, constructive algorithms, greedy, implementation, two pointers

Coloring

constructive algorithms, greedy, math

Lisa's Sequences

dp

King's Puzzle

constructive algorithms

Jumbled Trees

constructive algorithms, math

Interactive Factorial Guessing

brute force, games, implementation, interactive

Hot and Cold

binary search, interactive

Game of Questions

bitmasks, combinatorics, dp, fft, math, probabilities

Easy Assembly

greedy, sortings

Dominoes

combinatorics, flows, graph matchings, greedy

Cactus Meets Torus

BinCoin

binary search, divide and conquer, hashing, implementation, probabilities, trees

Amazing Trick

constructive algorithms, graph matchings, math, probabilities

Gaining Rating

binary search, greedy, implementation, math, sortings, two pointers

Copy of a Copy of a Copy

constructive algorithms, dfs and similar, graphs, implementation, sortings

Permutation Game

games

Absolute Sorting

constructive algorithms, math

Hossam and Range Minimum Query

binary search, bitmasks, data structures, hashing, probabilities, strings, trees

Hossam and a Letter

brute force, dp, implementation, two pointers

Hossam and (sub-)palindromic tree

brute force, data structures, dfs and similar, dp, strings, trees

Hossam and Trainees

greedy, math, number theory

Hossam and Friends

binary search, constructive algorithms, dp, two pointers

Koxia, Mahiru and Winter Festival

constructive algorithms

Koxia and Bracket

divide and conquer, fft, math

Koxia and Sequence

bitmasks, combinatorics, dp, math, number theory

Koxia and Tree

combinatorics, dfs and similar, dp, dsu, math, probabilities, trees

Koxia and Game

constructive algorithms, data structures, dfs and similar, dsu, flows, games, graph matchings, graphs, implementation

Koxia and Number Theory

brute force, chinese remainder theorem, math, number theory

Игра в Девятку III

*special problem, brute force

Игра в Девятку II

*special problem, brute force

Игра в Девятку I

*special problem, brute force, dp

Копирование файлов II

*special problem, binary search, brute force, math

Wonderful Jump

dp, greedy

Partial Sorting

combinatorics, math, number theory

Lucky Permutation

constructive algorithms, dfs and similar, graphs, greedy

Two Subtrees

data structures, trees

Algebra Flash

bitmasks, brute force, dp, graphs, math, meet-in-the-middle, trees

Playoff

combinatorics, constructive algorithms, dp, greedy, math

Count Binary Strings

data structures, dp

MCF

flows

Decomposition

binary search, brute force, data structures, divide and conquer, dp, two pointers

Lucky Chains

math, number theory

Number Reduction

greedy

Project Manager

brute force, data structures, implementation

Torus Path

greedy, math

Hero to Zero

graph matchings, math

Infinite Chess

implementation, shortest paths

Hospital Queue

binary search, graphs, greedy, implementation

Guess the String

constructive algorithms, interactive, probabilities

Chemistry Lab

dp, geometry, probabilities

Watch the Videos

binary search, constructive algorithms, two pointers

Card Guessing

combinatorics, dp, probabilities

Access Levels

bitmasks, dsu, flows, graph matchings

Doremy's Paint 2

data structures

Doremy's Perfect DS Class (Hard Version)

binary search, interactive

Doremy's Perfect DS Class (Medium Version)

binary search, interactive

Doremy's Perfect DS Class (Easy Version)

binary search, interactive

Doremy's Experimental Tree

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

Doremy's Number Line

dp, greedy, sortings

Doremy's Pegging Game

combinatorics, dp, math

Doremy's City Construction

graphs, greedy

Edge Queries

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

Node Pairs

dp, graphs, math, number theory

Valid Bitonic Permutations

combinatorics, dp, implementation, math, number theory

Another Array Problem

brute force, constructive algorithms, greedy

Unequal Adjacent Elements

constructive algorithms, sortings

Good Pairs

binary search, data structures, dp

Tree Sum

combinatorics, math, trees

GCD Queries

constructive algorithms, interactive, number theory

Binary Strings are Fun

combinatorics, math

Centroid Guess

interactive, probabilities, trees