Lexichromatography

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

Autosynthesis

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

Jellyfish and EVA

dp, graphs, greedy, math, probabilities

Jellyfish and Math

bitmasks, brute force, dfs and similar, dp, graphs, shortest paths

Mad City

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

Selling a Menagerie

dfs and similar, dsu, graphs, implementation, math

Standard Graph Problem

data structures, graphs, greedy, trees

Flower-like Pseudotree

constructive algorithms, graphs, greedy, implementation, trees

Candy Party (Easy Version)

bitmasks, constructive algorithms, graphs, greedy, implementation, math

Cyclic Operations

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

Keen Tree Calculation

binary search, data structures, dp, geometry, graphs, implementation, trees

Completely Searching for Inversions

dfs and similar, dp, graphs

Future Dominators

graphs, greedy

Swaps

combinatorics, dp, graphs, math

Speedrun

brute force, dfs and similar, dp, graphs, greedy, math, sortings, two pointers

Fast Travel Text Editor

data structures, dfs and similar, graphs, shortest paths

Teleportation in Byteland

data structures, dfs and similar, divide and conquer, graphs, shortest paths, trees

Counting Graphs

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

Imbalanced Arrays

constructive algorithms, graphs, greedy, math, sortings, two pointers

Vlad and the Mountains

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

Nastya and Potions

dfs and similar, dp, graphs, sortings

The Third Letter

dfs and similar, dsu, graphs, greedy, implementation

Rudolf and CodeVid-23

bitmasks, dp, graphs, greedy, shortest paths

Great Grids

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

Omsk Metro (simple version)

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

Tenzing and Random Real Numbers

bitmasks, dp, graphs, math, probabilities

Tenzing and His Animal Friends

constructive algorithms, graphs, greedy

Railguns

brute force, dfs and similar, dp, graphs

Good Graph

bitmasks, dfs and similar, graph matchings, graphs, implementation

Doctor's Brown Hypothesis

dfs and similar, graphs, math, number theory

Round Dance

dfs and similar, dsu, graphs, shortest paths

Copil Copac Draws Trees

dfs and similar, dp, graphs, trees

Forever Winter

dfs and similar, graphs, math

The Lakes

dfs and similar, dsu, graphs, implementation

Walk the Runway

bitmasks, brute force, data structures, dp, graphs, implementation, sortings

Random Walk

dp, graphs, math, probabilities, trees

Removing Graph

brute force, dp, games, graphs, math

Gardening Friends

brute force, dfs and similar, dp, graphs, trees

Fish Graph

brute force, constructive algorithms, dfs and similar, graphs

OH NO1 (-2-3-4)

constructive algorithms, graphs, math

Between

constructive algorithms, dfs and similar, graphs, greedy

Sum Graph

brute force, constructive algorithms, graphs, implementation, interactive, shortest paths, trees

Is It Flower?

dfs and similar, graphs, implementation

Monsters

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

Traveling in Berland

binary search, data structures, graphs, greedy, implementation

A Wide, Wide Graph

dfs and similar, dp, graphs, greedy, trees

Approximate Diameter

binary search, divide and conquer, graphs, shortest paths

Routing

bitmasks, brute force, dfs and similar, dp, graphs

The way home

binary search, data structures, dp, graphs, greedy, shortest paths, sortings

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

Li Hua and Maze

constructive algorithms, flows, graphs, greedy, implementation

Removal Sequences

bitmasks, dfs and similar, graphs

Graph Coloring (hard version)

brute force, combinatorics, divide and conquer, dp, fft, graphs

Graph Coloring (easy version)

combinatorics, dp, graphs

Tokens on Graph

constructive algorithms, dfs and similar, graphs, shortest paths

Timofey and Black-White Tree

brute force, dfs and similar, divide and conquer, graphs, greedy, math, shortest paths, trees

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

Double Sort II

dfs and similar, flows, graph matchings, graphs

The Game of the Century

constructive algorithms, graphs, shortest paths

Anya's Simultaneous Exhibition

constructive algorithms, graphs, greedy, interactive, sortings

Maximizing Root

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

Edge Reverse

binary search, dfs and similar, graphs, trees

Italian Data Centers

graphs, shortest paths

Train Splitting

constructive algorithms, graphs, greedy

Friendly Spiders

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

Copy of a Copy of a Copy

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

Koxia and Game

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

Lucky Permutation

constructive algorithms, dfs and similar, graphs, greedy

Algebra Flash

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

Hospital Queue

binary search, graphs, greedy, implementation

Doremy's City Construction

graphs, greedy

Edge Queries

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

Node Pairs

dp, graphs, math, number theory

Make It Connected

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

Set Construction

constructive algorithms, dfs and similar, graphs, greedy

SlavicG's Favorite Problem

bitmasks, dfs and similar, graphs

Tick, Tock

combinatorics, dfs and similar, dsu, graphs

The Beach

constructive algorithms, dfs and similar, graphs, shortest paths

Cactus Wall

constructive algorithms, dfs and similar, graphs, shortest paths

Kirill and Company

bitmasks, brute force, dfs and similar, dp, flows, graphs, shortest paths

Masha and a Beautiful Tree

dfs and similar, divide and conquer, graphs, sortings, trees

Arranging Crystal Balls

data structures, divide and conquer, divide and conquer, dp, geometry, graphs, number theory

Reset K Edges

binary search, data structures, dfs and similar, graphs, greedy, trees

Connectivity Addicts

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

Permutation Addicts

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

Ela and the Wiring Wizard

brute force, dp, graphs, greedy, implementation, shortest paths

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

Moving Both Hands

dp, graphs, shortest paths

Matching Reduction

brute force, constructive algorithms, dfs and similar, flows, graph matchings, graphs, interactive

Impressionism

constructive algorithms, graphs, implementation, math

Madoka and The First Session

constructive algorithms, flows, graph matchings, graphs, implementation

Long Way Home

data structures, divide and conquer, dp, geometry, graphs, greedy, shortest paths

2+ doors

2-sat, bitmasks, graphs, greedy

Party

brute force, graphs

Multiset of Strings

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

DFS Trees

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