New Roads

constructive algorithms, graphs, trees

Chloe and pleasant prizes

dfs and similar, dp, graphs, trees

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

data structures, dfs and similar, trees

Alyona and a tree

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

Ostap and Tree

dp, trees

Anton and Tree

dfs and similar, dp, trees

Drivers Dissatisfaction

data structures, dsu, graphs, trees

Xor-matic Number of the Graph

bitmasks, graphs, math, number theory, trees

Uniformly Branched Trees

combinatorics, dp, trees

Generating Sets

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

Andrew and Chemistry

dp, hashing, trees

Digit Tree

dfs and similar, divide and conquer, dsu, trees

Centroids

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

Vasiliy's Multiset

binary search, bitmasks, data structures, trees

Iron Man

data structures, geometry, trees

Connecting Universities

dfs and similar, dp, graphs, trees

Fix a Tree

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

...Wait for it...

data structures, dsu, trees

Puzzles

dfs and similar, math, probabilities, trees

Lorenzo Von Matterhorn

brute force, data structures, implementation, trees

Tree of Life (hard)

trees

Tree of Life (medium)

constructive algorithms, hashing, trees

Brain Network (hard)

trees

Brain Network (medium)

dfs and similar, graphs, trees

Kay and Snowflake

data structures, dfs and similar, dp, trees

Alyona and the Tree

dfs and similar, dp, graphs, trees

Gifts by the List

constructive algorithms, dfs and similar, graphs, trees

Tree Construction

data structures, trees

Beautiful Subarrays

data structures, divide and conquer, strings, trees

Bear and Forgotten Tree 2

dfs and similar, dsu, graphs, trees

Pursuit For Artifacts

dfs and similar, dsu, graphs, trees

Clockwork Bomb

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

Bear and Destroying Subtrees

dp, math, probabilities, trees

Bear and Chemistry

data structures, dfs and similar, graphs, trees

Bear and Forgotten Tree 3

constructive algorithms, graphs, trees

Road Improvement

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

The Chocolate Spree

dfs and similar, dp, graphs, trees

Magic Matrix

brute force, divide and conquer, graphs, matrices, trees

Famil Door and Roads

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

Island Puzzle

dfs and similar, dsu, graphs, trees

Preorder Test

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

Ants in Leaves

dfs and similar, greedy, sortings, trees

Xors on Segments

data structures, strings, trees

New Year Tree

bitmasks, data structures, trees

Hamiltonian Spanning Tree

dfs and similar, dp, graph matchings, greedy, trees

Running Track

dp, greedy, strings, trees

Kingdom and its Cities

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

Minimum spanning tree for each edge

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

Power Tree

data structures, trees

Pastoral Oddities

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

Acyclic Organic Compounds

data structures, dfs and similar, dsu, hashing, strings, trees

Lomsat gelral

data structures, dfs and similar, dsu, trees

Sandy and Nuts

bitmasks, dp, trees

Happy Tree Party

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

Super M

dfs and similar, dp, graphs, trees

Duff in the Army

data structures, trees

Zublicanes and Mumocrates

dp, trees, two pointers

Kefa and Park

dfs and similar, graphs, trees

Mirror Box

matrices, trees

Invariance of Tree

constructive algorithms, dfs and similar, greedy, trees

Bribes

dfs and similar, graphs, trees

Bear and Drawing

constructive algorithms, dfs and similar, trees

Campus

binary search, data structures, dsu, trees

Tree Requests

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

Restoring Map

bitmasks, constructive algorithms, trees

Logistical Questions

dfs and similar, divide and conquer, trees

Matching Names

dfs and similar, strings, trees

Ann and Half-Palindrome

data structures, dp, graphs, string suffix structures, strings, trees

Case of Computer Network

dfs and similar, graphs, trees

Mike and Friends

data structures, string suffix structures, strings, trees

Road Improvement

dp, trees

Infinite Inversions

binary search, data structures, implementation, sortings, trees

Demiurges Play Again

dfs and similar, dp, math, trees

Tavas on the Path

data structures, divide and conquer, trees

Work Group

dfs and similar, dp, graphs, strings, trees

Berland Miners

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

Spiders Evil Plan

greedy, trees

Reposts

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

A and B and Lecture Rooms

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

Drazil and Morning Exercise

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

Fox And Travelling

dp, trees

Progress Monitoring

dp, trees

Guess Your Way Out!

implementation, math, trees

Misha and LCP on Tree

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

Misha and Forest

constructive algorithms, data structures, greedy, sortings, trees

New Year Running

number theory, trees

New Year Santa Network

combinatorics, dfs and similar, graphs, trees

Birthday

data structures, dfs and similar, dp, trees

Treeland Tour

data structures, dfs and similar, dp, trees

Tourists

data structures, dfs and similar, graphs, trees

Valid Sets

dfs and similar, dp, math, trees

ELCA

data structures, trees

Random Function and Tree

combinatorics, dp, trees

Interesting Array

constructive algorithms, data structures, trees

Pillars

binary search, data structures, dp, sortings, trees

Design Tutorial: Inverse the Problem

dfs and similar, dsu, shortest paths, trees

Information Graph

dfs and similar, dsu, graphs, trees

Caisa and Tree

brute force, dfs and similar, math, number theory, trees

Appleman and Tree

dfs and similar, dp, trees

An easy problem about trees

dp, games, greedy, trees