Andryusha and Colored Balloons

dfs and similar, graphs, greedy, trees

Harmonious Graph

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

Cow and Snacks

dfs and similar, dsu, graphs

Neko Performs Cat Furrier Transform

bitmasks, constructive algorithms, dfs and similar, math

Tree Queries

dfs and similar, graphs, trees

New Year Permutation

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

Choosing Capital for Treeland

dfs and similar, dp, graphs, trees

Cthulhu

dfs and similar, dsu, graphs

Beautiful Graph

dfs and similar, graphs

Journey

dfs and similar, dp, dsu, implementation

Sum in the tree

constructive algorithms, dfs and similar, greedy, trees

Connect

brute force, dfs and similar, dsu

Strongly Connected City

brute force, dfs and similar, graphs, implementation

Xenia and Weights

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

Fake Plastic Trees

dfs and similar, dp, greedy, trees

Edge Weight Assignment

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

King's Path

dfs and similar, graphs, hashing, shortest paths

Hongcow Builds A Nation

dfs and similar, graphs

Recursive Queries

binary search, data structures, dfs and similar

Peaceful Rooks

dfs and similar, dsu, graphs

Bear and Three Musketeers

brute force, dfs and similar, graphs, hashing

Bakry and Partitioning

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

Playoff Tournament

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

The Third Letter

dfs and similar, dsu, graphs, greedy, implementation

Tree Painting

dfs and similar, dp, trees

Dr. Evil Underscores

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

New Reform

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

Tree with Maximum Cost

dfs and similar, dp, trees

Love Rescue

dfs and similar, dsu, graphs, greedy, strings

The Number of Imposters

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

Path Prefixes

binary search, data structures, dfs and similar, trees

Ping-Pong (Easy Version)

dfs and similar, graphs

Tree Tag

dfs and similar, dp, games, trees

Ice Cave

dfs and similar

Alyona and the Tree

dfs and similar, dp, graphs, trees

Mouse Hunt

dfs and similar, graphs

0-1 MST

dfs and similar, dsu, graphs, sortings

Minimum spanning tree for each edge

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

Escape The Maze (easy version)

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

Chat Screenshots

combinatorics, dfs and similar, graphs

SlavicG's Favorite Problem

bitmasks, dfs and similar, graphs

Lakes in Berland

dfs and similar, dsu, graphs, greedy, implementation

Directing Edges

constructive algorithms, dfs and similar, graphs

Socks

dfs and similar, dsu, graphs, greedy

Ciel the Commander

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

Peculiar apple-tree

dfs and similar, graphs, trees

Hidden Permutations

dfs and similar, interactive, math

Fools and Roads

data structures, dfs and similar, trees

Lucky Permutation

constructive algorithms, dfs and similar, graphs, greedy

Array Differentiation

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

Tree Requests

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

Mad City

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

Unbearable Controversy of Being

brute force, combinatorics, dfs and similar, graphs

L-shapes

dfs and similar, implementation

Tree Shuffling

dfs and similar, dp, greedy, trees

Game Master

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

Reachability from the Capital

dfs and similar, graphs, greedy

Fight Against Traffic

dfs and similar, graphs, shortest paths

Maximum AND

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

Fire Again

brute force, dfs and similar, shortest paths

Eternal Victory

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

Tree and Queries

data structures, dfs and similar, trees

A and B and Lecture Rooms

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

Compatible Numbers

bitmasks, brute force, dfs and similar, dp

Ugly Pairs

dfs and similar, greedy, implementation, sortings, strings

Captain Flint and Treasure

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

Biridian Forest

dfs and similar, shortest paths

Coach

brute force, dfs and similar, graphs

Propagating tree

data structures, dfs and similar, trees

Forming Teams

dfs and similar, implementation

Kuro and Walking Route

dfs and similar, trees

Mr. Kitayuta, the Treasure Hunter

dfs and similar, dp, two pointers

Blood Cousins

binary search, data structures, dfs and similar, trees

A Wide, Wide Graph

dfs and similar, dp, graphs, greedy, trees

Cow and Fields

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

Bertown roads

dfs and similar, graphs

Minimum Maximum Distance

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

Gargari and Permutations

dfs and similar, dp, graphs, implementation

Nearest Beautiful Number (easy version)

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

Bouncy Ball

brute force, dfs and similar, implementation

Nearest Opposite Parity

dfs and similar, graphs, shortest paths

Bandit in a City

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

Code For 1

constructive algorithms, dfs and similar, divide and conquer

Navigation System

dfs and similar, graphs, shortest paths

Book of Evil

dfs and similar, divide and conquer, dp, trees

Selling a Menagerie

dfs and similar, dsu, graphs, implementation, math

Connected Components?

data structures, dfs and similar, dsu, graphs

Monopole Magnets

constructive algorithms, dfs and similar, dsu, graphs

Bmail Computer Network

*special problem, dfs and similar, trees

Friendly Spiders

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

Weights Division (easy version)

data structures, dfs and similar, greedy, trees

Tree Cutting (Easy Version)

dfs and similar, trees

The Tag Game

dfs and similar, graphs

A Lot of Games

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

Decorate Apple Tree

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

Fix a Tree

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

Mike and Shortcuts

dfs and similar, graphs, greedy, shortest paths

Gardening Friends

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

Sorting by Subsequences

dfs and similar, dsu, implementation, math, sortings

MinOr Tree

bitmasks, dfs and similar, dsu, graphs, greedy