Circular Spanning Tree

constructive algorithms, implementation, trees

Timofey and Black-White Tree

brute force, dfs and similar, divide and conquer, graphs, greedy, math, shortest paths, trees

Pillars

binary search, data structures, dp, sortings, trees

Generating Sets

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

Build a Tree and That Is It

constructive algorithms, implementation, trees

New Year Santa Network

combinatorics, dfs and similar, graphs, trees

Exposition

binary search, data structures, dsu, trees, two pointers

Centroids

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

Sergey and Subway

dfs and similar, dp, trees

Bank Hacking

constructive algorithms, data structures, dp, trees

Vlad and Trouble at MIT

dfs and similar, dp, flows, graphs, greedy, implementation, trees

Vlad and the Mountains

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

Unusual Entertainment

data structures, dfs and similar, dsu, shortest paths, sortings, trees, two pointers

Paths in a Complete Binary Tree

bitmasks, trees

Beautiful Subarrays

data structures, divide and conquer, strings, trees

How Many Paths?

dfs and similar, dp, graphs, trees

Sum Graph

brute force, constructive algorithms, graphs, implementation, interactive, shortest paths, trees

Treelabeling

bitmasks, constructive algorithms, dfs and similar, games, greedy, implementation, trees

Mahmoud and a xor trip

bitmasks, constructive algorithms, data structures, dfs and similar, dp, math, trees

Bear and Tree Jumps

dfs and similar, dp, trees

Potion Brewing Class

dfs and similar, math, number theory, trees

Lynyrd Skynyrd

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

Array Collapse

data structures, divide and conquer, dp, trees

Destruction of a Tree

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

Choosing The Commander

bitmasks, data structures, trees

Tree Master

brute force, data structures, dfs and similar, trees

Berland Beauty

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

The Shortest Statement

graphs, shortest paths, trees

Kingdom and its Cities

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

Preorder

combinatorics, divide and conquer, dp, dsu, hashing, sortings, trees

Gold Transfer

binary search, data structures, dp, greedy, interactive, trees

Hossam and (sub-)palindromic tree

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

Dungeons and Candies

dsu, graphs, greedy, trees

Tourism

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

Road Improvement

dp, trees

Mocha and Diana (Hard Version)

brute force, constructive algorithms, dfs and similar, dsu, graphs, greedy, trees, two pointers

Paint the Tree

dp, sortings, trees

Petya and Construction Set

constructive algorithms, graphs, math, sortings, trees

Trees of Tranquillity

data structures, dfs and similar, greedy, trees

Dogeforces

constructive algorithms, data structures, dfs and similar, divide and conquer, dsu, greedy, sortings, trees

LuoTianyi and the Floating Islands (Hard Version)

combinatorics, dfs and similar, math, probabilities, trees

Tree Array

brute force, combinatorics, dp, graphs, math, probabilities, trees

Jeremy Bearimy

dfs and similar, graphs, greedy, trees

Guess Game

bitmasks, data structures, games, math, probabilities, sortings, strings, trees

Karen and Supermarket

brute force, dp, trees

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

data structures, dfs and similar, trees

XOR Tree

bitmasks, data structures, dfs and similar, dsu, greedy, trees

MEX Queries

binary search, data structures, trees

Neko and Aki's Prank

dp, greedy, trees

Qpwoeirut and Vertices

binary search, data structures, dfs and similar, divide and conquer, dsu, greedy, trees

Super M

dfs and similar, dp, graphs, trees

Mars rover

dfs and similar, graphs, implementation, trees

Imbalance Value of a Tree

data structures, dsu, graphs, trees

Ant on the Tree

constructive algorithms, dfs and similar, trees

Work Group

dfs and similar, dp, graphs, strings, trees

Running Track

dp, greedy, strings, trees

Removing Leaves

data structures, greedy, implementation, trees

Shark

brute force, data structures, dsu, trees

Weights Division (hard version)

binary search, dfs and similar, greedy, sortings, trees, two pointers

Case of Computer Network

dfs and similar, graphs, trees

Privatization of Roads in Treeland

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

Moment of Bloom

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

Hemose in ICPC ?

binary search, dfs and similar, implementation, interactive, math, number theory, trees

Construct the Binary Tree

brute force, constructive algorithms, trees

Tourists

data structures, dfs and similar, graphs, trees

An overnight dance in discotheque

dfs and similar, dp, geometry, greedy, trees

New Year Tree

data structures, divide and conquer, trees

Happy Life in University

data structures, dfs and similar, greedy, trees

Playoff Fixing

combinatorics, trees

Maximum Weight Subset

dp, trees

Tree Queries (Easy Version)

brute force, constructive algorithms, dfs and similar, dp, greedy, trees

Information Graph

dfs and similar, dsu, graphs, trees

Apple Tree

dfs and similar, number theory, trees

Fib-tree

brute force, dfs and similar, divide and conquer, number theory, trees

Irrigation

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

Infinite Inversions

binary search, data structures, implementation, sortings, trees

Ants in Leaves

dfs and similar, greedy, sortings, trees

Helga Hufflepuff's Cup

dp, trees

4-point polyline

brute force, constructive algorithms, geometry, trees

Dog Snacks

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

Binary Spiders

bitmasks, data structures, implementation, math, sortings, trees

Serge and Dining Room

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

Pursuit For Artifacts

dfs and similar, dsu, graphs, trees

Mike and Friends

data structures, string suffix structures, strings, trees

Symmetree

dfs and similar, hashing, implementation, trees

Digit Tree

dfs and similar, divide and conquer, dsu, trees

Tree Queries (Hard Version)

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

Merging Towers

data structures, dsu, implementation, trees

Dasha and Puzzle

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

Avoid Rainbow Cycles

data structures, dsu, graphs, greedy, sortings, trees

Xenon's Attack on the Gangs

combinatorics, dfs and similar, dp, greedy, trees

Graph and Queries

data structures, dsu, graphs, implementation, trees

X(or)-mas Tree

bitmasks, dfs and similar, dsu, graphs, trees

MEX Tree

combinatorics, dfs and similar, implementation, math, trees

Alternating Tree

combinatorics, dfs and similar, divide and conquer, dp, probabilities, trees

Prefix Function Queries

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

Nastia Plays with a Tree

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

The Number Games

data structures, greedy, trees

Tree Compass

constructive algorithms, dfs and similar, greedy, trees

Equidistant Vertices

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