Sum in Binary Tree

bitmasks, combinatorics, math, trees

Party

dfs and similar, graphs, trees

Bmail Computer Network

*special problem, dfs and similar, trees

Yet Another Card Deck

brute force, data structures, implementation, trees

Begginer's Zelda

greedy, trees

Apple Tree

combinatorics, dfs and similar, dp, math, trees

Reposts

*special problem, dfs and similar, dp, graphs, trees

Christmas Spruce

implementation, trees

Omkar and Heavenly Tree

constructive algorithms, trees

Strong Vertices

math, sortings, trees

Mahmoud and Ehab and the bipartiteness

dfs and similar, graphs, trees

Masha and a Beautiful Tree

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

White-Black Balanced Subtrees

dfs and similar, dp, graphs, trees

Vertical Paths

graphs, implementation, trees

PolandBall and Forest

dfs and similar, dsu, graphs, interactive, trees

Anji's Binary Tree

dfs and similar, dp, trees

Xor-tree

dfs and similar, trees

Petya and Catacombs

dsu, greedy, implementation, trees

Not Assigning

constructive algorithms, dfs and similar, number theory, trees

Mocha and Diana (Easy Version)

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

Copil Copac Draws Trees

dfs and similar, dp, graphs, trees

Queen

dfs and similar, trees

Useful Decomposition

implementation, trees

Send the Fool Further! (easy)

dfs and similar, graphs, trees

Spiders

dp, greedy, trees

Kefa and Park

dfs and similar, graphs, trees

Journey

dfs and similar, dp, graphs, probabilities, trees

Ehab and Path-etic MEXs

constructive algorithms, dfs and similar, greedy, trees

Edgy Trees

dfs and similar, dsu, graphs, math, trees

Cut 'em all!

dfs and similar, dp, graphs, greedy, trees

13th Labour of Heracles

data structures, greedy, sortings, trees

Weights Assignment For Tree Edges

constructive algorithms, trees

Peculiar apple-tree

dfs and similar, graphs, trees

Okabe and Boxes

data structures, greedy, trees

Lorenzo Von Matterhorn

brute force, data structures, implementation, trees

Mahmoud and Ehab and the wrong algorithm

constructive algorithms, trees

Misha and Forest

constructive algorithms, data structures, greedy, sortings, trees

Hashing Trees

constructive algorithms, trees

Brain Network (medium)

dfs and similar, graphs, trees

IT Restaurants

dfs and similar, dp, trees

k-Tree

dp, implementation, trees

Linova and Kingdom

dfs and similar, dp, greedy, sortings, trees

Game On Leaves

games, trees

Parsa's Humongous Tree

dfs and similar, divide and conquer, dp, greedy, trees

Minimal Height Tree

graphs, greedy, shortest paths, trees

Gardener and Tree

brute force, data structures, dfs and similar, greedy, implementation, trees

Infected Tree

dfs and similar, dp, trees

Timofey and a tree

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

Queries for the Array

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

Valera and Elections

dfs and similar, graphs, trees

Military Problem

dfs and similar, graphs, trees

Tree Cutting

binary search, dp, greedy, implementation, trees

Andryusha and Colored Balloons

dfs and similar, graphs, greedy, trees

Compression and Expansion

brute force, data structures, greedy, implementation, trees

Sum in the tree

constructive algorithms, dfs and similar, greedy, trees

Add on a Tree

trees

Tree Infection

binary search, greedy, sortings, trees

Alyona and the Tree

dfs and similar, dp, graphs, trees

Social Network

dsu, graphs, greedy, implementation, trees

Alex's whims

constructive algorithms, graphs, greedy, shortest paths, trees

Bear and Forgotten Tree 3

constructive algorithms, graphs, trees

Kuro and Walking Route

dfs and similar, trees

Decorate Apple Tree

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

Xenia and Bit Operations

data structures, trees

Valid BFS?

dfs and similar, graphs, shortest paths, trees

Cover it!

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

String Transformation 1

dsu, graphs, greedy, sortings, strings, trees, two pointers

Link Cut Centroids

constructive algorithms, dfs and similar, graphs, trees

Choosing Capital for Treeland

dfs and similar, dp, graphs, trees

Fake Plastic Trees

dfs and similar, dp, greedy, trees

0, 1, 2, Tree!

bitmasks, brute force, greedy, implementation, trees

Bakry and Partitioning

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

Path Prefixes

binary search, data structures, dfs and similar, trees

Escape The Maze (easy version)

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

Mad City

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

Minimum Maximum Distance

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

Fix a Tree

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

Gardening Friends

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

Minimum Diameter Tree

constructive algorithms, implementation, trees

Guess Your Way Out!

implementation, math, trees

Cutting Figure

constructive algorithms, graphs, trees

Puzzles

dfs and similar, math, probabilities, trees

WTF?

*special problem, graph matchings, implementation, trees

Game on Tree (Medium)

dfs and similar, dp, games, trees

Distance in Tree

dfs and similar, dp, trees

Uncle Bogdan and Country Happiness

dfs and similar, greedy, math, trees

Vasiliy's Multiset

binary search, bitmasks, data structures, trees

Maximum White Subtree

dfs and similar, dp, graphs, trees

Maximum Distributed Tree

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

Edge Weight Assignment

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

Playoff Tournament

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

Paint the Tree

brute force, constructive algorithms, dp, graphs, implementation, trees

Path Queries

divide and conquer, dsu, graphs, sortings, trees

Eternal Victory

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

Interesting Array

constructive algorithms, data structures, trees

A Wide, Wide Graph

dfs and similar, dp, graphs, greedy, trees

Lost Tree

constructive algorithms, interactive, trees

Xor-Subsequence (easy version)

bitmasks, brute force, dp, strings, trees, two pointers

Tree Cutting (Easy Version)

dfs and similar, trees

Vessels

data structures, dsu, implementation, trees