Three Paths on a Tree

dfs and similar, dp, trees

Chaotic V.

dp, graphs, greedy, math, number theory, trees

Xenon's Attack on the Gangs

combinatorics, dfs and similar, dp, greedy, trees

Delete a Segment

brute force, constructive algorithms, data structures, dp, graphs, sortings, trees, two pointers

Dr. Evil Underscores

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

Numbers on Tree

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

New Year and Social Network

data structures, graph matchings, graphs, math, trees

DIY Garland

constructive algorithms, greedy, trees

Tests for problem D

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

Segment Tree

data structures, dsu, graphs, trees

Miss Punyverse

dp, greedy, trees

Jeremy Bearimy

dfs and similar, graphs, greedy, trees

Tree Elimination

dp, trees

Economic Difficulties

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

Colored Tree

data structures, trees

Send Tree to Charlie

combinatorics, dfs and similar, dsu, trees

Tree Queries

data structures, probabilities, trees

Cheap Robot

binary search, dsu, graphs, shortest paths, trees

Shichikuji and Power Grid

dsu, graphs, greedy, shortest paths, trees

Tree Factory

constructive algorithms, greedy, trees

Regular Forestation

hashing, trees

Find String in a Grid

data structures, dp, strings, trees

Cleaning Robots

dp, trees

Maximum Weight Subset

dp, trees

Paint the Tree

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

The Maximum Subtree

dfs and similar, dp, graphs, trees

Paint the Tree

dp, sortings, trees

One Node is Gone

constructive algorithms, implementation, trees

Kamil and Making a Stream

math, number theory, trees

Tourism

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

Koala and Notebook

data structures, dfs and similar, graphs, shortest paths, strings, trees

Road Repair in Treeland

*special problem, binary search, dp, trees

King's Path

*special problem, math, trees

Forced Online Queries Problem

data structures, divide and conquer, dsu, graphs, trees

Tiles Placement

constructive algorithms, dfs and similar, trees

Petya and Construction Set

constructive algorithms, graphs, math, sortings, trees

Path Queries

divide and conquer, dsu, graphs, sortings, trees

Red Blue Tree

data structures, implementation, trees

Indie Album

data structures, dfs and similar, hashing, string suffix structures, strings, trees

Almost All

constructive algorithms, trees

Magic Tree

*special problem, data structures, dp, trees

Dynamic Diameter

*special problem, data structures, dfs and similar, divide and conquer, trees

Daleks' Invasion (hard)

data structures, dsu, graphs, trees

Daleks' Invasion (medium)

dfs and similar, graphs, shortest paths, trees

Daleks' Invasion (easy)

graphs, trees

Add on a Tree: Revolution

constructive algorithms, dfs and similar, implementation, trees

Add on a Tree

trees

Tree Painting

dfs and similar, dp, trees

Fedor Runs for President

data structures, dp, trees

Serge and Dining Room

binary search, data structures, graph matchings, greedy, implementation, math, trees

Irrigation

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

Complete Mirror

constructive algorithms, dfs and similar, dp, hashing, implementation, trees

Cover it!

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

Nauuo and Circle

combinatorics, dfs and similar, dp, trees

Minimal Segment Cover

data structures, dfs and similar, divide and conquer, dp, greedy, implementation, trees

Ehab and the Big Finale

constructive algorithms, divide and conquer, graphs, implementation, interactive, trees

Anagram Paths

dp, implementation, trees

Strange device

binary search, interactive, math, trees

0-1-Tree

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

Tree Generator™

data structures, implementation, trees

Neko and Aki's Prank

dp, greedy, trees

Leaf Partition

dp, trees

Serval and Rooted Tree

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

Niyaz and Small Degrees

data structures, dp, trees

Queen

dfs and similar, trees

Lynyrd Skynyrd

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

Double Tree

data structures, divide and conquer, shortest paths, trees

Edgy Trees

dfs and similar, dsu, graphs, math, trees

Privatization of Roads in Treeland

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

Matches Are Not a Child's Play

data structures, trees

Greedy Subsequences

data structures, dp, trees

Power Tree

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

Legendary Tree

binary search, interactive, trees

Tree Cutting (Hard Version)

combinatorics, dfs and similar, dp, trees

Tree Cutting (Easy Version)

dfs and similar, trees

Sasha and Algorithm of Silence's Sounds

data structures, trees

Sasha and Interesting Fact from Graph Theory

brute force, combinatorics, dp, math, trees

Tree-Tac-Toe

constructive algorithms, games, trees

Nearest Leaf

data structures, trees

Tree

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

GCD Counting

data structures, dfs and similar, dp, number theory, trees

Cookies

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

Construct a tree

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

Sum in the tree

constructive algorithms, dfs and similar, greedy, trees

Vladislav and a Great Legend

combinatorics, dp, trees

Minimum Diameter Tree

constructive algorithms, implementation, trees

Tree with Maximum Cost

dfs and similar, dp, trees

Minimal Diameter Forest

constructive algorithms, dfs and similar, greedy, trees

Max Mex

data structures, trees

The Fair Nut and the Best Path

data structures, dp, trees

Ehab and a weird weight formula

data structures, trees

Ehab and a component choosing problem

dp, greedy, math, trees

Decorate Apple Tree

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

Vasya and Maximum Matching

dp, trees

Company

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

Vasya and a Tree

data structures, trees

Tree and XOR

strings, trees

Intersecting Subtrees

dfs and similar, interactive, trees

Choosing Two Paths

dfs and similar, dp, greedy, trees

Random Forest Rank

dp, graph matchings, math, trees