Tenzing and Tree

dfs and similar, greedy, shortest paths, sortings, trees

Nene vs. Monsters (Easy Version)

brute force, implementation, math

Legen...

data structures, dp, matrices, strings

Defender of Childhood Dreams

bitmasks, constructive algorithms, divide and conquer

Bipartite Checking

data structures, dsu, graphs

Xorcerer's Stones

bitmasks, constructive algorithms, dp, trees

Move and Swap

dfs and similar, dp, greedy, trees

Alex and a TV Show

bitmasks, combinatorics, number theory

Swapping Problem

brute force, constructive algorithms, data structures, sortings

Removing Graph

brute force, dp, games, graphs, math

Tokitsukaze and Permutations

dp, math

Frogs and mosquitoes

data structures, greedy

Falling Sand (Easy Version)

dfs and similar, graphs, greedy

LCM Sum (hard version)

brute force, data structures, math, number theory, two pointers

Sports Betting

bitmasks, combinatorics, dp, graphs, math, probabilities

Replace on Segment

dp, graph matchings

Almost Fault-Tolerant Database

brute force, constructive algorithms, dfs and similar, greedy, implementation

Add on a Tree: Revolution

constructive algorithms, dfs and similar, implementation, trees

Two Arithmetic Progressions

math, number theory

Happy New Year

bitmasks, dp, implementation

Rare Coins

combinatorics, math, probabilities

Museums Tour

dp, graphs, implementation

Picking Strings

constructive algorithms, implementation, strings

Rectangle Painting 2

flows, graph matchings, graphs

Iahub and Xors

data structures

ANDfinity

bitmasks, brute force, constructive algorithms, dfs and similar, dsu, graphs

Tree Queries

dfs and similar, graphs, trees

Up and Down the Tree

dfs and similar, dp, trees

Strange Function

binary search, data structures, dp, greedy

Cow and Treats

binary search, combinatorics, dp, greedy, implementation, math

Working routine

data structures, implementation

Bear and Company

dp

New Year and Castle Construction

combinatorics, geometry, math, sortings

Leaf Partition

dp, trees

Middle Duplication

data structures, dfs and similar, greedy, strings, trees

Summer Earnings

binary search, bitmasks, brute force, geometry, sortings

Controversial Rounds

binary search, data structures, dp, greedy, two pointers

Levko and Strings

combinatorics, dp

Text Editor

brute force, dp, greedy, strings

Colored Balls

greedy, math, number theory

Swap and Maximum Block

bitmasks, data structures, dfs and similar, divide and conquer, dp

Gojou and Matrix Game

data structures, dp, games, hashing, implementation, math, number theory, sortings

Game With String

games

Roads in the Kingdom

dfs and similar, dp, graphs, trees

Bags with Balls

combinatorics, dp, math, number theory

Summoning Minions

constructive algorithms, dp, flows, graph matchings, greedy, sortings

Cats on the Upgrade (easy version)

brute force, data structures, dfs and similar, divide and conquer, dp, graphs, trees

Independent Set

dfs and similar, dp, trees

Necklace

constructive algorithms, math

Hossam and Range Minimum Query

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

The World Is Just a Programming Task (Hard Version)

implementation

Double Sort II

dfs and similar, flows, graph matchings, graphs

Madoka and the Sixth-graders

data structures, dfs and similar, greedy

Curious Array

brute force, combinatorics, implementation, math

Group Photo

binary search, data structures, implementation, two pointers

Anti-Palindromize

flows, graphs, greedy

Financiers Game

dp

Maximum Reduction

combinatorics, data structures, math

Doremy's Experimental Tree

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

Game with Cards

binary search, constructive algorithms, data structures, dp, greedy, implementation

Miss Punyverse

dp, greedy, trees

Aquarium decoration

data structures, greedy, two pointers

Narrow Components

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

K-Set Tree

combinatorics, dfs and similar, dp, math, trees

Lottery

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

Dead Ends

bitmasks, dp

In Search of Truth (Hard Version)

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

Reading Books (hard version)

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

Construct Tree

bitmasks, constructive algorithms, dp, trees

Ela Goes Hiking

combinatorics, dp, math, probabilities

The Top Scorer

combinatorics, dp, math, probabilities

Points

combinatorics, data structures, implementation, math, matrices

Smooth Sailing (Easy Version)

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

Coloring

combinatorics, constructive algorithms, implementation, math

Tree Factory

constructive algorithms, greedy, trees

Peterson Polyglot

brute force, dfs and similar, dsu, hashing, strings, trees

The Boss's Identity

binary search, bitmasks, data structures, dfs and similar, greedy, math, sortings

Case of a Top Secret

binary search, implementation, math

Christmas Game

bitmasks, data structures, dfs and similar, dp, games, math, trees

Dividing Kingdom II

brute force, data structures, dsu, graphs, sortings

DSU Master

combinatorics, dp, dsu, math

Battle Lemmings

dp, greedy

Expected Square Beauty

dp, math, probabilities

Tree

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

Ostap and Tree

dp, trees

Algebra Flash

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

Small Permutation Problem (Hard Version)

combinatorics, dp, math

Dasha and Chess

constructive algorithms, games, interactive

Tree Queries

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

Alphabet Permutations

data structures, strings

Lena and Queries

data structures, divide and conquer, geometry

The Tree Has Fallen!

bitmasks, dfs and similar, math, trees

Lexichromatography

combinatorics, dfs and similar, dsu, graphs, two pointers

Balancing Weapons

binary search, brute force, data structures, math, two pointers

Balance

dp

Max Sum Array

combinatorics, constructive algorithms, greedy, sortings

Baby Ehab Plays with Permutations

combinatorics, dp, math

Contact ATC

Village (Maximum)

*special problem, dfs and similar, trees

The Neutral Zone

brute force, math