Last chance

data structures, flows, graph matchings, graphs, trees

Distance Matching

constructive algorithms, dfs and similar, trees

Find String in a Grid

data structures, dp, strings, trees

Pairs

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

Tree Calendar

brute force, constructive algorithms, data structures, dfs and similar, sortings, trees

Raining season

data structures, divide and conquer, trees

Sagheer and Kindergarten

dfs and similar, graphs, implementation, 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

Heaps

dp, trees

Tree nesting

combinatorics, graphs, trees

Berland Miners

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

Upgrading Tree

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

May Holidays

data structures, trees

Snowy Mountain

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

Bus Routes

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

Journey

dp, trees

Spring cleaning

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

Segment Covering

brute force, combinatorics, constructive algorithms, data structures, dp, trees

Teleportation in Byteland

data structures, dfs and similar, divide and conquer, graphs, shortest paths, trees

Masha and Cactus

dp, trees

Tiles Placement

constructive algorithms, dfs and similar, trees

Legendary Tree

binary search, interactive, trees

Leaders

dfs and similar, dsu, graphs, trees

Red-Black Cobweb

data structures, divide and conquer, implementation, trees

Tavas on the Path

data structures, divide and conquer, trees

Directing Edges

dfs and similar, dp, graphs, trees

Andrey's Tree

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

Andrew and Chemistry

dp, hashing, trees

Air Reform

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

Inverse Genealogy

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

Uniformly Branched Trees

combinatorics, dp, trees

Smooth Sailing (Hard Version)

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

Colorful Tree Again

brute force, data structures, trees

Bear and Chemistry

data structures, dfs and similar, graphs, trees

Squid Game

data structures, dfs and similar, greedy, trees

Shifting Dominoes

data structures, geometry, graphs, trees

Nikita and game

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

Keen Tree Calculation

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

Speed Dial

dp, strings, trees

Weighed Tree Radius

data structures, divide and conquer, implementation, trees

Recover the Tree

constructive algorithms, trees

Sherlock's bet to Moriarty

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

Around the World

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

Magic Tree

*special problem, data structures, dp, trees

Edge Queries

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

One Node is Gone

constructive algorithms, implementation, trees

Arkady and a Nobody-men

data structures, dfs and similar, trees

Random Forest Rank

dp, graph matchings, math, trees

Exam

data structures, string suffix structures, trees

Cycles in product

combinatorics, divide and conquer, trees

Pilgrims

dfs and similar, dp, trees

Noble Knight's Path

data structures, trees

Gasoline prices

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

Electrical Efficiency

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

In a Trap

trees

Reunion

combinatorics, dp, trees

Broken Tree

dfs and similar, dp, graphs, greedy, trees

Gastronomic Event

dp, greedy, trees

The Majestic Brown Tree Snake

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

Tree and XOR

strings, trees

Policeman and a Tree

dp, graphs, trees

AB Tree

dp, greedy, trees

Game On Tree

data structures, dfs and similar, greedy, trees

Double Tree

data structures, divide and conquer, shortest paths, trees

Matches Are Not a Child's Play

data structures, trees

Garden

bitmasks, dp, graphs, trees

New Year and Finding Roots

constructive algorithms, implementation, interactive, trees

Big Problems for Organizers

data structures, graphs, trees

Distance to the Path

data structures, dfs and similar, trees

Rowena Ravenclaw's Diadem

trees

Similar Words

dp, hashing, strings, trees

...Wait for it...

data structures, dsu, trees

Information Reform

dp, implementation, trees

Can Bash Save the Day?

data structures, divide and conquer, graphs, trees

Colored Tree

data structures, trees

Dasha and cyclic table

bitmasks, brute force, fft, strings, trees

Tree Elimination

dp, trees

Jamie and To-do List

data structures, interactive, trees

Ehab and a weird weight formula

data structures, trees

Balance

constructive algorithms, dfs and similar, graphs, trees

Daleks' Invasion (hard)

data structures, dsu, graphs, trees

Cleaning Robots

dp, trees

Tree Cutting (Hard Version)

combinatorics, dfs and similar, dp, trees

Mashtali and Hagh Trees

combinatorics, dp, trees

Game of Stacks

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

Tree Queries

brute force, dp, trees

Birthday

data structures, dfs and similar, dp, trees

Timofey and a flat tree

data structures, graphs, hashing, shortest paths, trees

Choosing Two Paths

dfs and similar, dp, greedy, trees

Random Function and Tree

combinatorics, dp, trees

Petya and Tree

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

Michael and Hotel

binary search, interactive, trees

Mirror Box

matrices, trees

Multiset of Strings

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

M-tree

data structures, math, sortings, trees

Forced Online Queries Problem

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

T-decomposition

dfs and similar, graphs, greedy, trees

Words on Tree

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