Edgy Trees

dfs and similar, dsu, graphs, math, trees

Unforgivable Curse (hard version)

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

Knight Tournament

data structures, dsu

Secret Passwords

dfs and similar, dsu, graphs

Bear and Friendship Condition

dfs and similar, dsu, graphs

K-Complete Word

dfs and similar, dsu, greedy, implementation, strings

Cyclic Components

dfs and similar, dsu, graphs

Serial Time!

dfs and similar, dsu

Sorting by Subsequences

dfs and similar, dsu, implementation, math, sortings

XOUR

data structures, dsu, sortings

Connect

brute force, dfs and similar, dsu

Where is the Pizza?

data structures, dfs and similar, dsu, graphs, implementation, math

Phase Shift

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

Heavy Intervals

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

Mr. Kitayuta's Colorful Graph

dfs and similar, dp, dsu, graphs

DZY Loves Chemistry

dfs and similar, dsu, greedy

Unforgivable Curse (easy version)

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

NEKO's Maze Game

data structures, dsu, implementation

Mocha and Diana (Easy Version)

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

News Distribution

dfs and similar, dsu, graphs

Learning Languages

dfs and similar, dsu

Alice and Hairdresser

dsu, implementation

Petya and Catacombs

dsu, greedy, implementation, trees

Drazil and His Happy Friends

brute force, dsu, meet-in-the-middle, number theory

PolandBall and Forest

dfs and similar, dsu, graphs, interactive, trees

Jatayu's Balanced Bracket Sequence

data structures, dsu, graphs, greedy

Little Alawn's Puzzle

combinatorics, dp, dsu, graphs, math

Inversion Graph

data structures, dsu, graphs, math

Books Exchange (hard version)

dfs and similar, dsu, math

Find the Different Ones!

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

Mahmoud and Ehab and the message

dsu, greedy, implementation

Coloring a Tree

dfs and similar, dsu, greedy

Hemose Shopping

constructive algorithms, dsu, math, sortings

Ice Skating

brute force, dfs and similar, dsu, graphs

Misha and Changing Handles

data structures, dsu, strings

The Lakes

dfs and similar, dsu, graphs, implementation

Books Exchange (easy version)

dsu, math

Equal or Not Equal

constructive algorithms, dsu, implementation