Game On Tree

data structures, dfs and similar, greedy, trees

Policeman and a Tree

dp, graphs, trees

Double Tree

data structures, divide and conquer, shortest paths, trees

Information Reform

dp, implementation, trees

Colored Tree

data structures, trees

Tree Cutting (Hard Version)

combinatorics, dfs and similar, dp, trees

Birthday

data structures, dfs and similar, dp, trees

Random Function and Tree

combinatorics, dp, trees

Two-Paths

data structures, dp, trees

Unordered Swaps

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

Cities Excursions

dfs and similar, graphs, trees

Bear and Destroying Subtrees

dp, math, probabilities, trees

Almost All

constructive algorithms, trees

XOR Partition

binary search, bitmasks, data structures, divide and conquer, greedy, trees

Sum of Prefix Sums

data structures, divide and conquer, geometry, trees

Bracket Insertion

combinatorics, dp, math, trees

DZY Loves Planting

binary search, dsu, trees

Fedor Runs for President

data structures, dp, trees

Chaotic V.

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

Off by One

constructive algorithms, dfs and similar, geometry, graphs, sortings, trees

Nested Rubber Bands

constructive algorithms, dfs and similar, dp, math, trees

Split

binary search, data structures, divide and conquer, dsu, math, trees, two pointers

Good Graph

data structures, dsu, graphs, trees

Christmas Chocolates

dfs and similar, dp, games, graphs, implementation, math, number theory, shortest paths, trees

Region Separation

combinatorics, dp, number theory, trees

Clusterization Counting

combinatorics, dp, dsu, fft, graphs, trees

Distance Tree (hard version)

binary search, dfs and similar, shortest paths, trees

Indie Album

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

Best Edge Weight

data structures, dfs and similar, graphs, trees

Cowmpany Cowmpensation

combinatorics, dp, math, trees

Tree Queries

data structures, probabilities, trees

Tree Generator™

data structures, implementation, trees

The Hidden Pair (Hard Version)

binary search, dfs and similar, graphs, interactive, shortest paths, trees

Close Vertices

data structures, divide and conquer, trees

PermuTree (hard version)

bitmasks, dfs and similar, dp, fft, greedy, implementation, math, trees

Digit Tree

dfs and similar, divide and conquer, dsu, trees

Moonwalk challenge

data structures, strings, trees

Star Trek

*special problem, combinatorics, dfs and similar, dp, games, graphs, matrices, trees

Eye-Pleasing City Park Tour

data structures, trees

Amanda the Amoeba

graphs, implementation, trees, two pointers

Frequency Mismatch (Easy Version)

binary search, data structures, divide and conquer, hashing, probabilities, trees

Upgrading Tree

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

Heaps

dp, trees

Broken Tree

dfs and similar, dp, graphs, greedy, trees

Dasha and cyclic table

bitmasks, brute force, fft, strings, trees

Forced Online Queries Problem

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

Words on Tree

2-sat, dfs and similar, dsu, graphs, trees

Power Tree

data structures, trees

Maximizing Root

dfs and similar, dp, graphs, math, number theory, trees

Tree Sum

combinatorics, math, trees

Sandy and Nuts

bitmasks, dp, trees

Pairs of Paths

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

Lenient Vertex Cover

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

Road Projects

dfs and similar, dp, trees

Random Walk

dp, graphs, math, probabilities, trees

Preorder Test

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

Nastya and Time Machine

constructive algorithms, dfs and similar, graphs, trees

Tree Recovery

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

Mobile Phone Network

dfs and similar, dsu, graphs, trees

The Chocolate Spree

dfs and similar, dp, graphs, trees

Choosing Subtree is Fun

binary search, data structures, dfs and similar, trees, two pointers

Death DBMS

data structures, string suffix structures, strings, trees

Adam and Tree

data structures, trees

Mathematics Curriculum

brute force, combinatorics, dp, trees

Xor-matic Number of the Graph

bitmasks, graphs, math, number theory, trees

Rollbacks (Hard Version)

data structures, interactive, trees

Stranger Trees

dp, math, matrices, trees

Koala and Notebook

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

BFS Trees

combinatorics, dfs and similar, graphs, math, shortest paths, trees

Pairs of Pairs

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

Nearest Leaf

data structures, trees

Phoenix and Earthquake

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

Graph and Queries

data structures, dsu, graphs, implementation, trees

King's Path

*special problem, math, trees

Poachers

dp, games, graphs, trees

Madness

constructive algorithms, dfs and similar, trees

Last chance

data structures, flows, graph matchings, graphs, trees

Journey

dp, trees

Keen Tree Calculation

binary search, data structures, dp, geometry, graphs, implementation, trees

One Node is Gone

constructive algorithms, implementation, trees

Electrical Efficiency

combinatorics, data structures, dp, math, number theory, trees

Garden

bitmasks, dp, graphs, trees

Rowena Ravenclaw's Diadem

trees

Balance

constructive algorithms, dfs and similar, graphs, trees

Choosing Two Paths

dfs and similar, dp, greedy, trees

Multiset of Strings

bitmasks, brute force, dp, fft, flows, graphs, math, meet-in-the-middle, trees

Babysitting

2-sat, binary search, data structures, graphs, trees

Genetic engineering

dp, string suffix structures, trees

Maze

dfs and similar, dp, probabilities, trees

Colored Subgraphs

dfs and similar, dp, games, greedy, trees

Caterpillar on a Tree

dfs and similar, graphs, greedy, implementation, sortings, trees

XOR, Tree, and Queries

bitmasks, constructive algorithms, dfs and similar, dsu, graphs, greedy, implementation, trees

Village (Maximum)

*special problem, dfs and similar, trees

Tree Queries

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

The Tree Has Fallen!

bitmasks, dfs and similar, math, trees

Algebra Flash

bitmasks, brute force, dp, graphs, math, meet-in-the-middle, trees

Tree

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

Ostap and Tree

dp, trees

Christmas Game

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

Peterson Polyglot

brute force, dfs and similar, dsu, hashing, strings, trees