Fix a Tree

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

The Tag Game

dfs and similar, graphs

Decorate Apple Tree

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

A Lot of Games

dfs and similar, dp, games, implementation, strings, trees

Weights Division (easy version)

data structures, dfs and similar, greedy, trees

Tree Cutting (Easy Version)

dfs and similar, trees

Bmail Computer Network

*special problem, dfs and similar, trees

Monopole Magnets

constructive algorithms, dfs and similar, dsu, graphs

Friendly Spiders

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

Navigation System

dfs and similar, graphs, shortest paths

Connected Components?

data structures, dfs and similar, dsu, graphs

Selling a Menagerie

dfs and similar, dsu, graphs, implementation, math

Book of Evil

dfs and similar, divide and conquer, dp, trees

Code For 1

constructive algorithms, dfs and similar, divide and conquer

Bandit in a City

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

Nearest Opposite Parity

dfs and similar, graphs, shortest paths

Bouncy Ball

brute force, dfs and similar, implementation

Nearest Beautiful Number (easy version)

binary search, bitmasks, brute force, constructive algorithms, dfs and similar, greedy

Gargari and Permutations

dfs and similar, dp, graphs, implementation

Bertown roads

dfs and similar, graphs

Cow and Fields

binary search, data structures, dfs and similar, graphs, greedy, shortest paths, sortings

Minimum Maximum Distance

dfs and similar, dp, graphs, shortest paths, trees

A Wide, Wide Graph

dfs and similar, dp, graphs, greedy, trees

Kuro and Walking Route

dfs and similar, trees

Mr. Kitayuta, the Treasure Hunter

dfs and similar, dp, two pointers

Forming Teams

dfs and similar, implementation

Coach

brute force, dfs and similar, graphs

Blood Cousins

binary search, data structures, dfs and similar, trees

Propagating tree

data structures, dfs and similar, trees

Captain Flint and Treasure

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

Biridian Forest

dfs and similar, shortest paths

Ugly Pairs

dfs and similar, greedy, implementation, sortings, strings

Compatible Numbers

bitmasks, brute force, dfs and similar, dp

A and B and Lecture Rooms

binary search, data structures, dfs and similar, dp, trees

Tree and Queries

data structures, dfs and similar, trees

Eternal Victory

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

Fire Again

brute force, dfs and similar, shortest paths

Fight Against Traffic

dfs and similar, graphs, shortest paths

Maximum AND

bitmasks, dfs and similar, divide and conquer, greedy, sortings

Reachability from the Capital

dfs and similar, graphs, greedy

Game Master

data structures, dfs and similar, dp, graphs, greedy, two pointers

Tree Shuffling

dfs and similar, dp, greedy, trees

Circle Perimeter

binary search, brute force, dfs and similar, geometry, implementation, math

Unbearable Controversy of Being

brute force, combinatorics, dfs and similar, graphs

L-shapes

dfs and similar, implementation

Mad City

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

Tree Requests

binary search, bitmasks, constructive algorithms, dfs and similar, graphs, trees

Array Differentiation

bitmasks, brute force, constructive algorithms, dfs and similar, dp, graphs, math

Lucky Permutation

constructive algorithms, dfs and similar, graphs, greedy

Hidden Permutations

dfs and similar, interactive, math

Fools and Roads

data structures, dfs and similar, trees

Socks

dfs and similar, dsu, graphs, greedy

Peculiar apple-tree

dfs and similar, graphs, trees

Ciel the Commander

constructive algorithms, dfs and similar, divide and conquer, greedy, trees

Lakes in Berland

dfs and similar, dsu, graphs, greedy, implementation

Directing Edges

constructive algorithms, dfs and similar, graphs

SlavicG's Favorite Problem

bitmasks, dfs and similar, graphs

Escape The Maze (easy version)

dfs and similar, greedy, shortest paths, trees, two pointers

Minimum spanning tree for each edge

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

0-1 MST

dfs and similar, dsu, graphs, sortings

Chat Screenshots

combinatorics, dfs and similar, graphs

Alyona and the Tree

dfs and similar, dp, graphs, trees

Mouse Hunt

dfs and similar, graphs

Ice Cave

dfs and similar

Tree Tag

dfs and similar, dp, games, trees

Ping-Pong (Easy Version)

dfs and similar, graphs

The Number of Imposters

constructive algorithms, dfs and similar, dp, dsu, graphs

Love Rescue

dfs and similar, dsu, graphs, greedy, strings

Path Prefixes

binary search, data structures, dfs and similar, trees

Tree with Maximum Cost

dfs and similar, dp, trees

New Reform

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

Dr. Evil Underscores

bitmasks, brute force, dfs and similar, divide and conquer, dp, greedy, strings, trees

Tree Painting

dfs and similar, dp, trees

Playoff Tournament

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

The Third Letter

dfs and similar, dsu, graphs, greedy, implementation

Bear and Three Musketeers

brute force, dfs and similar, graphs, hashing

Bakry and Partitioning

bitmasks, constructive algorithms, dfs and similar, dp, graphs, trees

Peaceful Rooks

dfs and similar, dsu, graphs

Recursive Queries

binary search, data structures, dfs and similar

Hongcow Builds A Nation

dfs and similar, graphs

King's Path

dfs and similar, graphs, hashing, shortest paths

Fake Plastic Trees

dfs and similar, dp, greedy, trees

Edge Weight Assignment

bitmasks, constructive algorithms, dfs and similar, greedy, math, trees

Xenia and Weights

constructive algorithms, dfs and similar, dp, graphs, greedy, shortest paths

Strongly Connected City

brute force, dfs and similar, graphs, implementation

Connect

brute force, dfs and similar, dsu

Sum in the tree

constructive algorithms, dfs and similar, greedy, trees

Journey

dfs and similar, dp, dsu, implementation

Beautiful Graph

dfs and similar, graphs

Cthulhu

dfs and similar, dsu, graphs

Choosing Capital for Treeland

dfs and similar, dp, graphs, trees

New Year Permutation

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

Neko Performs Cat Furrier Transform

bitmasks, constructive algorithms, dfs and similar, math

Cow and Snacks

dfs and similar, dsu, graphs

Harmonious Graph

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

Andryusha and Colored Balloons

dfs and similar, graphs, greedy, trees

Tree Queries

dfs and similar, graphs, trees

Maximum Distributed Tree

dfs and similar, dp, greedy, implementation, math, number theory, sortings, trees

Swap Adjacent Elements

dfs and similar, greedy, math, sortings, two pointers

Maximum White Subtree

dfs and similar, dp, graphs, trees