Building Tree

data structures, divide and conquer, dsu, graphs, graphs, implementation

Equal Multisets (Hard Version)

constructive algorithms, dsu, greedy

Tree Orientation (Hard Version)

dfs and similar, dsu, graphs, greedy, sortings, trees

Tree Orientation (Easy Version)

constructive algorithms, dfs and similar, dsu, graphs, greedy, matrices, trees

Toothless

constructive algorithms, dfs and similar, dsu

Hanabi

binary search, data structures, dp, dsu, flows, graph matchings, graphs, greedy

Simons and Reconstructing His Roads

constructive algorithms, constructive algorithms, constructive algorithms, constructive algorithms, data structures, data structures, dsu, graphs

Simons and Dividing the Rhythm

combinatorics, data structures, dp, dsu, math, string suffix structures, strings, strings, strings

Prufer Vertex

combinatorics, dsu, number theory, probabilities, trees

Jerry and Tom

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

Exquisite Array

combinatorics, data structures, dsu, sortings

Remove at the lowest cost

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

Sliding Tiles

data structures, divide and conquer, dsu

Rae Taylor and Trees (hard version)

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

Rae Taylor and Trees (easy version)

binary search, data structures, dp, dsu, greedy, implementation, trees

Journey

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

Rectangles

brute force, data structures, dp, dsu, greedy, implementation, two pointers

Sink

data structures, divide and conquer, dsu, graphs, implementation

Adjusting Drones

binary search, brute force, data structures, dp, dsu, greedy, implementation, sortings

Juan's Colorful Tree

data structures, dfs and similar, dfs and similar, dsu, graphs, graphs, meet-in-the-middle, trees

Merging Vertices in a Graph

*special problem, dfs and similar, dsu, graphs

By the Assignment

binary search, bitmasks, combinatorics, dfs and similar, dsu, graphs, math

Double Perspective

constructive algorithms, dp, dsu, graphs, greedy, sortings

Ancient Tree

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

Big Wins! (hard version)

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

Big Wins! (easy version)

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

Omg Graph

brute force, dsu, graphs, greedy, shortest paths, sortings

Neo's Escape

binary search, brute force, data structures, dp, dsu, graphs, greedy, implementation

Goblin

dfs and similar, dp, dsu, greedy, math

Modulo 3

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

Baggage Claim

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

Disappearing Permutation

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

MST in Modulo Graph

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

Graph Inclusion

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

Porto Vs. Benfica

data structures, dfs and similar, dsu, graphs, shortest paths

Mycraft Sand Sort

combinatorics, data structures, dsu, greedy, math, sortings

Counting Is Not Fun (Hard Version)

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

Counting Is Not Fun (Easy Version)

combinatorics, data structures, dfs and similar, dp, dsu, graphs, hashing, implementation, math, trees

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