Demiurges Play Again

dfs and similar, dp, math, trees

Gift

dsu, graphs, sortings, trees

Compressed Tree

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

Short Code

data structures, dp, greedy, strings, trees

Tree Folding

dfs and similar, dp, greedy, implementation, trees

Hill Climbing

dfs and similar, geometry, trees

Ralph And His Tour in Binary Country

brute force, data structures, trees

Drivers Dissatisfaction

data structures, dsu, graphs, trees

Bribes

dfs and similar, graphs, trees

Divisor Tree

brute force, number theory, trees

Brain Network (hard)

trees

Thwarting Demonstrations

binary search, data structures, trees

Paint Tree

constructive algorithms, divide and conquer, geometry, sortings, trees

BinCoin

binary search, divide and conquer, hashing, implementation, probabilities, trees

Ksenia and Pawns

dfs and similar, graphs, implementation, trees

Interstellar battle

math, probabilities, trees

Berland Federalization

dp, trees

Maximum Control (medium)

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

Petya and Tree

binary search, dfs and similar, probabilities, sortings, trees

Jamie and To-do List

data structures, interactive, trees

Leaders

dfs and similar, dsu, graphs, trees

Help King

implementation, probabilities, trees

Lomsat gelral

data structures, dfs and similar, dsu, trees

Dominant Indices

data structures, dsu, trees

Centroids

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

Road Improvement

dp, 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

Tree Array

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

LuoTianyi and the Floating Islands (Hard Version)

combinatorics, dfs and similar, math, probabilities, trees

MEX Queries

binary search, data structures, trees

Qpwoeirut and Vertices

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

Removing Leaves

data structures, greedy, implementation, trees

Hemose in ICPC ?

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

Happy Life in University

data structures, dfs and similar, greedy, trees

Binary Spiders

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

Dog Snacks

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

Pursuit For Artifacts

dfs and similar, dsu, graphs, trees

Tree Queries (Hard Version)

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

Merging Towers

data structures, dsu, implementation, trees

Xenon's Attack on the Gangs

combinatorics, dfs and similar, dp, greedy, trees

Alternating Tree

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

Company

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

Yet Another Array Counting Problem

binary search, data structures, divide and conquer, dp, flows, math, trees

Tree Compass

constructive algorithms, dfs and similar, greedy, trees

Delete a Segment

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

Subtree Minimum Query

data structures, trees

Sasha and the Wedding Binary Search Tree

brute force, combinatorics, data structures, dfs and similar, math, trees

PermutationForces II

brute force, combinatorics, greedy, sortings, trees, two pointers

Scheme

dfs and similar, graphs, trees

Unique Occurrences

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

There Should Be a Lot of Maximums

brute force, data structures, dfs and similar, dp, trees, two pointers

Sasha and the Happy Tree Cutting

bitmasks, brute force, dfs and similar, dp, graphs, greedy, math, trees

Omsk Metro (hard version)

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

Rubik's Cube Coloring (hard version)

brute force, dp, implementation, math, trees

wxhtzdy ORO Tree

binary search, bitmasks, brute force, data structures, dfs and similar, implementation, trees

Ann and Half-Palindrome

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

Sagheer and Apple Tree

games, trees

Points, Lines and Ready-made Titles

dfs and similar, dsu, graphs, trees

Famil Door and Roads

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

Bear and Drawing

constructive algorithms, dfs and similar, trees

Guess the Tree

bitmasks, constructive algorithms, dp, greedy, trees

Shaass the Great

dp, trees

Matching Names

dfs and similar, strings, trees

Fafa and Ancient Mathematics

dfs and similar, dp, trees

Progress Monitoring

dp, trees

Chemistry in Berland

dfs and similar, greedy, trees

Beautiful Road

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

Illusions of the Desert

data structures, trees

Mashmokh and Water Tanks

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

Castle

dp, greedy, probabilities, sortings, trees

Santa Clauses and a Soccer Championship

constructive algorithms, dfs and similar, graphs, trees

Hyperspace Highways

dfs and similar, graphs, trees

Dating

brute force, dfs and similar, graphs, trees

Cleaning Robots

dp, trees

Similar Words

dp, hashing, strings, trees

Spring cleaning

*special problem, data structures, dfs and similar, graphs, trees

Xenia and Tree

data structures, divide and conquer, trees

Tree and Queries

data structures, dfs and similar, trees

The Shortest Statement

graphs, shortest paths, trees

Karen and Supermarket

brute force, dp, trees

XOR Tree

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

Imbalance Value of a Tree

data structures, dsu, graphs, trees

New Year Tree

data structures, divide and conquer, trees

Fib-tree

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

Avoid Rainbow Cycles

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

MEX Tree

combinatorics, dfs and similar, implementation, math, trees

Xor-Subsequence (hard version)

bitmasks, data structures, dp, strings, trees

Make It Connected

binary search, brute force, constructive algorithms, dsu, graphs, greedy, matrices, trees, two pointers

GCD Counting

divide and conquer, dp, dsu, number theory, trees

Jamie and Tree

data structures, trees

Tree Destruction

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

Black and White Tree

dfs and similar, greedy, trees

Spanning Tree Queries

binary search, data structures, dfs and similar, dsu, graphs, greedy, math, sortings, trees

Ehab and the Big Finale

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

Plan of Lectures

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

Ehab and a component choosing problem

dp, greedy, math, trees

Purple Crayon

data structures, dfs and similar, games, graphs, greedy, math, sortings, trees

The Fox and the Complete Tree Traversal

constructive algorithms, dp, implementation, math, trees

DFS Trees

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