Graph Composition

dfs and similar, dsu, graphs, greedy

Another Exercise on Graphs (hard version)

binary search, dfs and similar, dp, dsu, graphs, shortest paths, sortings

Another Exercise on Graphs (Easy Version)

binary search, brute force, dp, dsu, graphs, shortest paths, sortings

Nested Segments

combinatorics, dfs and similar, dp, dsu, math

Snakes

bitmasks, dp, dsu, graphs

MEX OR Mania

bitmasks, brute force, data structures, dsu, implementation

Medium Demon Problem (hard version)

dfs and similar, dp, dsu, graphs, implementation, trees

Bottle Arrangement

data structures, divide and conquer, dp, dsu, greedy

Sakurako, Kosuke, and the Permutation

brute force, data structures, dfs and similar, dsu, graphs, greedy, math

Kousuke's Assignment

data structures, dp, dsu, greedy, math

Penchick and Desert Rabbit

binary search, data structures, dfs and similar, dp, dsu, greedy, implementation, two pointers

Cool Graph

constructive algorithms, data structures, dfs and similar, dsu, graphs, greedy, trees

Billetes MX (Hard Version)

binary search, combinatorics, data structures, dsu, graphs

Billetes MX (Easy Version)

2-sat, binary search, combinatorics, constructive algorithms, dfs and similar, dsu, graphs

Digital Village (Extreme Version)

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

Digital Village (Hard Version)

data structures, dp, dsu, graphs, math, trees

Digital Village (Easy Version)

brute force, data structures, dfs and similar, dp, dsu, fft, graphs, greedy, implementation, math, trees

Connect the Dots

brute force, dp, dsu, graphs, math, trees

Complex Segments (Hard Version)

binary search, data structures, divide and conquer, dsu, greedy, math, sortings

Complex Segments (Easy Version)

binary search, data structures, divide and conquer, dsu, greedy, math, sortings

Max Plus Min Plus Size

data structures, dp, dsu, greedy, implementation, matrices, sortings

Sakurako's Hobby

dp, dsu, graphs, math

Iris and the Tree

brute force, data structures, dfs and similar, dsu, math, trees

Guess The Tree

binary search, brute force, dfs and similar, divide and conquer, dsu, greedy, interactive, trees

Funny Game

constructive algorithms, dsu, graphs, greedy, math, number theory, trees

Wonderful Tree!

brute force, data structures, dfs and similar, dsu, greedy, trees

Maximize the Largest Component (Hard Version)

data structures, dfs and similar, dp, dsu, implementation

Maximize the Largest Component (Easy Version)

brute force, data structures, dfs and similar, dsu, graphs, implementation

Turtle and Intersected Segments

data structures, dsu, graphs, greedy

Large Graph

data structures, dfs and similar, dsu, graphs, number theory, two pointers

XOUR

data structures, dsu, sortings

Nene and the Passing Game

constructive algorithms, data structures, dsu, graphs, sortings

Chain Reaction

binary search, data structures, dsu, greedy, implementation, math, number theory

MST with Matching

bitmasks, brute force, dsu, graph matchings, trees

Burenka and Pether

*special problem, data structures, dfs and similar, divide and conquer, dsu, graphs, sortings, trees

Parallel Universes

*special problem, constructive algorithms, dfs and similar, dsu, graphs

Andrey's Tree

binary search, constructive algorithms, data structures, dfs and similar, dsu, greedy, implementation, trees

Sum over all Substrings (Hard Version)

bitmasks, divide and conquer, dp, dsu, greedy, implementation, strings

Microcycle

data structures, dfs and similar, dsu, graphs, greedy, implementation, sortings, trees

Find the Different Ones!

binary search, brute force, data structures, dp, dsu, greedy, two pointers

Count Paths

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

Berserk Monsters

brute force, data structures, dsu, implementation, math

Smooth Sailing (Hard Version)

binary search, data structures, dsu, geometry, graphs, trees

Smooth Sailing (Easy Version)

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

Array Repetition

binary search, brute force, dsu, implementation, math

01 Tree

constructive algorithms, data structures, dsu, greedy, sortings, trees

Light Bulbs (Easy Version)

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

Heavy Intervals

constructive algorithms, data structures, dsu, greedy, math, sortings

Transitive Graph

dfs and similar, dp, dsu, graphs, implementation

Unusual Entertainment

data structures, dfs and similar, dsu, shortest paths, sortings, trees, two pointers

Infinite Card Game

binary search, brute force, data structures, dfs and similar, dp, dsu, games, graphs, greedy, sortings, two pointers

Split

binary search, data structures, divide and conquer, dsu, math, trees, two pointers

Lexichromatography

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

Mad City

dfs and similar, dsu, games, graphs, shortest paths, trees

Selling a Menagerie

dfs and similar, dsu, graphs, implementation, math

Andrey and Escape from Capygrad

binary search, data structures, dp, dsu, greedy, sortings

Counting Graphs

combinatorics, divide and conquer, dsu, graphs, greedy, sortings, trees

Vlad and the Mountains

binary search, data structures, dsu, graphs, implementation, sortings, trees, two pointers

The Third Letter

dfs and similar, dsu, graphs, greedy, implementation

Max to the Right of Min

binary search, data structures, divide and conquer, dp, dsu, two pointers

Professor Higashikata

data structures, dsu, greedy, implementation, strings

Rating System

binary search, brute force, data structures, dp, dsu, greedy, math, two pointers

Multiple of Three Cycles

combinatorics, data structures, dp, dsu, math

Great Grids

2-sat, constructive algorithms, dfs and similar, dsu, graphs

Ksyusha and Chinchilla

constructive algorithms, dfs and similar, dp, dsu, greedy, implementation, trees

Round Dance

dfs and similar, dsu, graphs, shortest paths

The Lakes

dfs and similar, dsu, graphs, implementation

Range Sorting (Easy Version)

binary search, dp, dsu, greedy, trees, two pointers

LuoTianyi and XOR-Tree

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

Communication Towers

brute force, divide and conquer, dsu

Monsters

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

DSU Master

combinatorics, dp, dsu, math

Flow Control

data structures, dsu, implementation

Gasoline prices

data structures, divide and conquer, dsu, hashing, trees

Unforgivable Curse (hard version)

brute force, constructive algorithms, dfs and similar, dsu, graphs, greedy, strings

Unforgivable Curse (easy version)

brute force, constructive algorithms, dsu, graphs, greedy, strings

City Union

constructive algorithms, dfs and similar, dsu, geometry, greedy, implementation, math

Li Hua and Path

data structures, dfs and similar, divide and conquer, dsu, trees

Li Hua and Array

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

XOR, Tree, and Queries

bitmasks, constructive algorithms, dfs and similar, dsu, graphs, greedy, implementation, trees

Game on Axis

combinatorics, dfs and similar, dsu, graphs, implementation

Delicious Dessert

binary search, dsu, hashing, math, number theory, string suffix structures

Boris and His Amazing Haircut

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

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

Access Levels

bitmasks, dsu, flows, graph matchings

Doremy's Experimental Tree

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

Edge Queries

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

Make It Connected

binary search, brute force, constructive algorithms, dsu, graphs, greedy, matrices, trees, two pointers

Tick, Tock

combinatorics, dfs and similar, dsu, graphs

Dangerous Laser Power

constructive algorithms, dsu, sortings

Connectivity Addicts

constructive algorithms, dsu, graphs, greedy, interactive, shortest paths, trees

Permutation Addicts

constructive algorithms, data structures, dfs and similar, dsu, graphs, trees

Phase Shift

dfs and similar, dsu, graphs, greedy, implementation, strings

Edge Split

brute force, constructive algorithms, dfs and similar, dsu, graphs, probabilities, trees

Jatayu's Balanced Bracket Sequence

data structures, dsu, graphs, greedy

Kingdom of Criticism

data structures, dsu

Imitating the Key Tree

combinatorics, dsu, trees

Cross Swapping

2-sat, data structures, dsu, greedy, matrices

XOR Tree

bitmasks, data structures, dfs and similar, dsu, greedy, trees