Escaping on Beaveractor

data structures, implementation, trees

Tree and Permutation Game

dfs and similar, games, graphs, trees

Flower-like Pseudotree

constructive algorithms, graphs, greedy, implementation, trees

Furukawa Nagisa's Tree

binary search, divide and conquer, sortings, trees

Find String in a Grid

data structures, dp, strings, trees

Li Hua and Path

data structures, dfs and similar, divide and conquer, dsu, trees

Anagram Paths

dp, implementation, trees

Parmigiana With Seafood

binary search, dp, greedy, trees

Berland Miners

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

Colorful Tree Again

brute force, data structures, trees

Smooth Sailing (Hard Version)

binary search, data structures, dsu, geometry, graphs, trees

Edge Queries

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

Around the World

bitmasks, combinatorics, dfs and similar, dp, graphs, graphs, math, trees

Gasoline prices

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

The Majestic Brown Tree Snake

dfs and similar, dp, greedy, trees, two pointers

...Wait for it...

data structures, dsu, trees

Michael and Hotel

binary search, interactive, trees

Game of Stacks

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

Black, White and Grey Tree

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

Partial Virtual Trees

combinatorics, dfs and similar, dp, math, trees

Olha and Igor

interactive, probabilities, trees

James and the Chase

dfs and similar, graphs, probabilities, trees

Tree Weights

bitmasks, constructive algorithms, data structures, dfs and similar, implementation, math, matrices, number theory, trees

Treeland and Viruses

data structures, dfs and similar, dp, shortest paths, trees

Vladislav and a Great Legend

combinatorics, dp, trees

Logistical Questions

dfs and similar, divide and conquer, trees

Freezing with Style

binary search, data structures, divide and conquer, trees

Misha and LCP on Tree

binary search, dfs and similar, hashing, string suffix structures, trees

Pastoral Oddities

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

Restore the Tree

graphs, greedy, trees

Cactus to Tree

dp, graphs, trees

Two Rooted Trees

data structures, implementation, trees

Problem of offices

constructive algorithms, dfs and similar, dp, trees

Johnny and James

greedy, implementation, math, trees

Tree or not Tree

data structures, divide and conquer, implementation, trees

Snowy Mountain

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

May Holidays

data structures, trees

Andrew and Chemistry

dp, hashing, trees

Cycles in product

combinatorics, divide and conquer, trees

Noble Knight's Path

data structures, trees

Tree and XOR

strings, trees

Tree Elimination

dp, trees

Mashtali and Hagh Trees

combinatorics, dp, trees

Timofey and a flat tree

data structures, graphs, hashing, shortest paths, trees

Edge Elimination

constructive algorithms, dfs and similar, dp, trees

XOR and Distance

bitmasks, divide and conquer, trees

Pumping Stations

brute force, dfs and similar, divide and conquer, flows, graphs, greedy, trees

Subsequence

brute force, divide and conquer, dp, greedy, trees

Max Mex

data structures, trees

Fox And Travelling

dp, trees

Odd Mineral Resource

binary search, bitmasks, brute force, data structures, probabilities, trees

Arpa’s letter-marked tree and Mehrdad’s Dokhtar-kosh paths

data structures, dfs and similar, trees

Visible Black Areas

data structures, dsu, geometry, trees

Imitating the Key Tree

combinatorics, dsu, trees

Alien DNA

data structures, dsu, trees

Perfect Matching

data structures, divide and conquer, interactive, trees

Beautiful Tree

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

Tree nesting

combinatorics, graphs, trees

Red-Black Cobweb

data structures, divide and conquer, implementation, trees

Tiles Placement

constructive algorithms, dfs and similar, trees

Directing Edges

dfs and similar, dp, graphs, trees

Inverse Genealogy

constructive algorithms, divide and conquer, dp, math, trees

Nikita and game

binary search, dfs and similar, divide and conquer, graphs, trees

Andrey's Tree

binary search, constructive algorithms, data structures, dfs and similar, dsu, greedy, implementation, trees

Speed Dial

dp, strings, trees

Weighed Tree Radius

data structures, divide and conquer, implementation, trees

Sherlock's bet to Moriarty

constructive algorithms, data structures, divide and conquer, geometry, graphs, implementation, trees

Random Forest Rank

dp, graph matchings, math, trees

Pilgrims

dfs and similar, dp, trees

Big Problems for Organizers

data structures, graphs, trees

Distance to the Path

data structures, dfs and similar, trees

New Year and Finding Roots

constructive algorithms, implementation, interactive, trees

Ehab and a weird weight formula

data structures, trees

Tree Queries

brute force, dp, trees

M-tree

data structures, math, sortings, trees

Caterpillar

dfs and similar, dp, graphs, trees

Cats on the Upgrade (hard version)

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

Mex Tree

brute force, dp, trees

Xors on Segments

data structures, strings, trees

Prince's Problem

brute force, data structures, math, number theory, trees

Two Centroids

data structures, dfs and similar, greedy, trees

Roads and Ramen

data structures, trees

Boboniu and Jianghu

dp, greedy, sortings, trees

Singer House

combinatorics, dp, graphs, trees

NN country

binary search, data structures, trees

Drazil and Morning Exercise

dfs and similar, dp, dsu, trees, two pointers

e-Government

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

Tree Modification

brute force, constructive algorithms, dfs and similar, graph matchings, graphs, trees

You Are Given a Tree

data structures, dp, trees

Mike and Friends

data structures, string suffix structures, strings, trees

Case of Computer Network

dfs and similar, graphs, trees

Kingdom and its Cities

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

Tree of Life (medium)

constructive algorithms, hashing, trees

Baldman and the military

dfs and similar, graphs, trees

Galaxy Union

dp, trees, two pointers

Frequency Mismatch (Hard Version)

binary search, data structures, dfs and similar, hashing, probabilities, trees

Sagheer and Kindergarten

dfs and similar, graphs, implementation, trees

Pairs

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

Uniformly Branched Trees

combinatorics, dp, trees

Arkady and a Nobody-men

data structures, dfs and similar, trees