Fallen Leaves

dfs and similar, dp, dp, trees, trees

Stop Spot

implementation, strings, trees

Statistics on Tree

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

MEX Replacement on Tree

data structures, implementation, math, trees

Coloring a Red Black Tree

dfs and similar, dp, greedy, math, probabilities, trees, trees

The 67th Tree Problem

constructive algorithms, implementation, trees

Closer

dfs and similar, dp, trees

Down the Pivot

combinatorics, dp, math, trees

Maze

trees

Oriented Journey

bitmasks, brute force, communication, constructive algorithms, graphs, interactive, trees

Minimum Path Cover

brute force, dp, greedy, interactive, interactive, math, number theory, trees

A Simple Problem

binary search, data structures, greedy, math, trees

A Simple RBS Problem

constructive algorithms, math, strings, trees

Dynamic Values And Maximum Sum

data structures, data structures, greedy, implementation, trees

Tree Orientation (Hard Version)

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

Tree Orientation (Easy Version)

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

Bowser's Castle (Hard Version)

constructive algorithms, divide and conquer, interactive, trees, two pointers

Bowser's Castle (Medium Version)

constructive algorithms, divide and conquer, interactive, trees, two pointers

Bowser's Castle (Easy Version)

binary search, constructive algorithms, divide and conquer, greedy, interactive, trees

Boxed Like a Fish

dfs and similar, dp, games, shortest paths, trees

Christmas Tree Un-decoration

data structures, dp, trees

Subtree Removal Game

binary search, games, trees

Simons and Beating Peaks

data structures, data structures, divide and conquer, dp, dp, greedy, implementation, trees

Six Seven

divide and conquer, math, number theory, strings, strings, trees

Idiot First Search and Queries

binary search, data structures, dp, graphs, trees

Idiot First Search

dfs and similar, dp, trees

Again Trees... (hard version)

bitmasks, data structures, dfs and similar, dp, fft, trees

Again Trees... (Easy Version)

bitmasks, dfs and similar, dp, trees

Remove the Grail Tree

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

Paths in a Tree

dfs and similar, interactive, sortings, trees

Cost of Tree

dp, greedy, trees, trees

Prufer Vertex

combinatorics, dsu, number theory, probabilities, trees

Zhora the Vacuum Cleaner

data structures, dfs and similar, dp, greedy, implementation, sortings, trees

Many Cartesian Trees

greedy, sortings, trees

Al Fine (Counting Version)

dp, trees

Al Fine (Maximizing Version)

binary search, data structures, divide and conquer, trees

Jerry and Tom

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

Cherry Tree

dfs and similar, dp, graphs, trees

Jumping Man

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

Tree Coloring (Hard Version)

combinatorics, constructive algorithms, data structures, dfs and similar, greedy, implementation, trees

Tree Coloring (Easy Version)

constructive algorithms, dfs and similar, greedy, trees

Short Garland

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

Blackslex and Another RGB Walking

communication, constructive algorithms, graphs, interactive, number theory, trees

Conquer or of Forest

combinatorics, math, trees

Remove at the lowest cost

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

Mosaic Tree

combinatorics, dp, fft, math, trees

Secret Message

data structures, dp, greedy, trees

Rae Taylor and Trees (hard version)

binary search, constructive algorithms, data structures, dp, dsu, greedy, implementation, trees

Rae Taylor and Trees (easy version)

binary search, data structures, dp, dsu, greedy, implementation, trees

Tree, TREE!!!

dfs and similar, dp, math, trees

Rainbow Branch

constructive algorithms, dp, greedy, trees

Pointless Machine

constructive algorithms, graphs, interactive, trees

Chain Prefix Rank (Hard Version)

binary search, combinatorics, data structures, dfs and similar, dp, graphs, math, trees

Chain Prefix Rank (Easy Version)

combinatorics, dfs and similar, dp, math, trees

Beautiful Tree

constructive algorithms, math, probabilities, trees

SubMST

combinatorics, graphs, trees

Strange Operation (Hard Version)

data structures, greedy, trees

Juan's Colorful Tree

data structures, dfs and similar, dfs and similar, dsu, graphs, graphs, meet-in-the-middle, trees

Catshock

constructive algorithms, dfs and similar, graphs, trees, two pointers

Odd Queries on Odd Array

bitmasks, brute force, data structures, implementation, trees

Query Jungle

data structures, implementation, math, matrices, trees

Cycle Closing

constructive algorithms, graphs, implementation, shortest paths, trees

Max Sum OR (Easy Version)

bitmasks, constructive algorithms, divide and conquer, greedy, trees

Maple and Tree Beauty (Hard Version)

bitmasks, brute force, dfs and similar, dp, fft, trees

Maple and Tree Beauty (Easy Version)

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

To the Infinity

data structures, hashing, math, trees

Sliding Tree

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

I Yearned For The Mines

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

Arboris Contractio

data structures, graphs, greedy, trees

23 Rises Again

brute force, dfs and similar, dp, flows, graph matchings, graphs, greedy, implementation, probabilities, trees

Ancient Tree

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

Root was Built by Love, Broken by Destiny

combinatorics, dfs and similar, graphs, trees

Big Wins! (hard version)

binary search, data structures, divide and conquer, dsu, trees, two pointers

1-1-1, Free Tree!

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

Lexicographic Partition

constructive algorithms, math, trees

Longest Good Subsequence

dp, math, trees

Tree Parking

combinatorics, fft, math, trees

Divine Tree

constructive algorithms, greedy, math, sortings, trees

Volcanic Eruptions

dfs and similar, dp, greedy, shortest paths, trees

Shifts and Swaps

data structures, graphs, hashing, trees

Wildflower

combinatorics, dfs and similar, trees

Gellyfish and Camellia Japonica

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

Kirei Attacks the Estate

dfs and similar, dp, greedy, trees

From Kazan with Love

dfs and similar, graphs, implementation, trees

Tree Colorings

combinatorics, dfs and similar, dp, graphs, math, number theory, trees

Reachability and Tree

constructive algorithms, dfs and similar, graphs, trees

Spruce Dispute

constructive algorithms, dfs and similar, graphs, greedy, implementation, shortest paths, trees

Ain and Apple Tree

binary search, constructive algorithms, greedy, math, trees

Apple Tree Traversing

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

Baudelaire (hard version)

binary search, dfs and similar, divide and conquer, implementation, interactive, trees

Baudelaire (easy version)

binary search, constructive algorithms, divide and conquer, greedy, interactive, trees

Modulo 3

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

Shoo Shatters the Sunshine

combinatorics, dp, trees

Kia Bakes a Cake

data structures, dp, greedy, trees

Baggage Claim

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

Shorten the Array

binary search, bitmasks, data structures, dfs and similar, greedy, strings, trees, two pointers

MST in Modulo Graph

constructive algorithms, dsu, graphs, greedy, math, number theory, sortings, trees

LeaFall

combinatorics, dp, probabilities, trees

Trapmigiano Reggiano

constructive algorithms, data structures, dfs and similar, dp, greedy, sortings, trees

Tree Jumps

dfs and similar, dp, trees