Go Learn! (Easy Version)

dp, trees

Tree Operations

binary search, brute force, dfs and similar, dp, trees

Sakurako and Chefir

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

Genokraken

constructive algorithms, data structures, graphs, greedy, implementation, interactive, trees, two pointers

Penchick and Chloe's Trees

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

Cool Graph

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

Alice's Adventures in the Rabbit Hole

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

Bermart Ice Cream

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

Choose Your Queries

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

Tree of Life

dp, greedy, trees

Digital Village (Extreme Version)

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

Digital Village (Hard Version)

data structures, dp, dsu, graphs, math, trees

Digital Village (Easy Version)

brute force, data structures, dfs and similar, dp, dsu, fft, graphs, greedy, implementation, math, trees

Connect the Dots

brute force, dp, dsu, graphs, math, trees

Tree Pruning

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

Sheriff's Defense

dfs and similar, dp, greedy, trees

Game in Tree (Hard Version)

binary search, data structures, trees

Game in Tree (Easy Version)

binary search, brute force, data structures, dp, games, greedy, implementation, trees

Iris's Full Binary Tree

brute force, data structures, dfs and similar, trees

Iris and the Tree

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

Iris and Game on the Tree

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

DFS Checker (Hard Version)

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

DFS Checker (Easy Version)

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

Deterministic Heap (Hard Version)

combinatorics, dp, trees

Deterministic Heap (Easy Version)

combinatorics, dp, math, trees

Guess The Tree

binary search, brute force, dfs and similar, divide and conquer, dsu, greedy, interactive, trees

Maximize the Root

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

Stardew Valley

constructive algorithms, dfs and similar, graphs, trees

Wooden Game

bitmasks, greedy, math, trees

Funny Game

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

Catch the Mole(Hard Version)

binary search, data structures, dfs and similar, divide and conquer, interactive, trees

Catch the Mole(Easy Version)

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

The Omnipotent Monster Killer

brute force, dfs and similar, dp, trees

Spinning Round (Hard Version)

divide and conquer, dp, trees

Spinning Round (Easy Version)

divide and conquer, dp, trees

Wonderful Tree!

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

Non-academic Problem

dfs and similar, graphs, trees

Shuffle

dp, greedy, trees

Your Loss

bitmasks, brute force, dp, trees

Turtle and Paths on a Tree

data structures, dp, trees

Yasya and the Mysterious Tree

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

Remove Bridges

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

Splittable Permutations

combinatorics, data structures, dfs and similar, greedy, math, trees

Chain Queries

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

Paint the Tree

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

Min-Fund Prison (Hard)

bitmasks, dfs and similar, dp, graphs, trees

Min-Fund Prison (Medium)

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

Min-Fund Prison (Easy)

dfs and similar, trees

Game on Tree (Hard)

dfs and similar, dp, games, trees

Game on Tree (Medium)

dfs and similar, dp, games, trees

Balanced Unshuffle (Hard)

constructive algorithms, trees

Balanced Unshuffle (Medium)

brute force, constructive algorithms, trees

Fenwick Tree

bitmasks, brute force, combinatorics, data structures, dp, math, trees

Frequency Mismatch (Hard Version)

binary search, data structures, dfs and similar, hashing, probabilities, trees

Frequency Mismatch (Easy Version)

binary search, data structures, divide and conquer, hashing, probabilities, trees

Thanos Snap

binary search, dp, games, greedy, trees

0, 1, 2, Tree!

bitmasks, brute force, greedy, implementation, trees

Amanda the Amoeba

graphs, implementation, trees, two pointers

Dating

greedy, sortings, trees

Annual Ants' Gathering

dfs and similar, dp, greedy, trees

MST with Matching

bitmasks, brute force, dsu, graph matchings, trees

Tree Cutting

binary search, dp, greedy, implementation, trees

Tree Compass

constructive algorithms, dfs and similar, greedy, trees

Farmer John's Favorite Intern

data structures, dp, flows, trees

Burenka and Pether

*special problem, data structures, dfs and similar, divide and conquer, dsu, graphs, sortings, trees

Evidence Board

*special problem, constructive algorithms, dfs and similar, graphs, trees

Andrey's Tree

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

Interactive Mex Tree

constructive algorithms, dfs and similar, interactive, trees

Prefix Max Set Counting

data structures, dp, trees

Sasha and the Wedding Binary Search Tree

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

Sasha and the Happy Tree Cutting

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

Sasha and a Walk in the City

combinatorics, dp, math, trees

Microcycle

data structures, dfs and similar, dsu, graphs, greedy, implementation, sortings, trees

Vlad and Trouble at MIT

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

Count Paths

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

Smooth Sailing (Hard Version)

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

Tree Diameter

interactive, trees

Tree LGM

constructive algorithms, divide and conquer, games, trees

01 Tree

constructive algorithms, data structures, dsu, greedy, sortings, trees

Caterpillar on a Tree

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

Construct Tree

bitmasks, constructive algorithms, dp, trees

Optimizations From Chelsu

divide and conquer, dp, number theory, trees

Happy Life in University

data structures, dfs and similar, greedy, trees

Light Bulbs (Easy Version)

brute force, combinatorics, dfs and similar, dp, dsu, graphs, math, trees

Programming Competition

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

Array Collapse

data structures, divide and conquer, dp, trees

Build Railway Stations

*special problem, greedy, trees

One-X

combinatorics, dfs and similar, dp, math, trees

Begginer's Zelda

greedy, trees

Beautiful Tree

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

Tree Queries

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

Babysitting

2-sat, binary search, data structures, graphs, trees

Trees and XOR Queries Again

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

Collapsing Strings

data structures, strings, trees

Compressed Tree

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

Anji's Binary Tree

dfs and similar, dp, trees

Unusual Entertainment

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

Alex's whims

constructive algorithms, graphs, greedy, shortest paths, trees

XOR Construction

bitmasks, constructive algorithms, data structures, math, string suffix structures, trees

A Growing Tree

data structures, dfs and similar, trees