Book of Evil

dfs and similar, divide and conquer, dp, trees

Lost Tree

constructive algorithms, interactive, trees

Bmail Computer Network

*special problem, dfs and similar, trees

Xor-Subsequence (easy version)

bitmasks, brute force, dp, strings, trees, two pointers

Tree Cutting (Easy Version)

dfs and similar, trees

Weights Division (easy version)

data structures, dfs and similar, greedy, trees

Mahmoud and Ehab and the wrong algorithm

constructive algorithms, trees

A Lot of Games

dfs and similar, dp, games, implementation, strings, trees

Decorate Apple Tree

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

Fix a Tree

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

XOR Construction

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

Gardening Friends

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

Number of Simple Paths

combinatorics, dfs and similar, graphs, trees

Misha and Forest

constructive algorithms, data structures, greedy, sortings, trees

Water Tree

data structures, dfs and similar, graphs, trees

Petya and Catacombs

dsu, greedy, implementation, trees

Three Paths on a Tree

dfs and similar, dp, greedy, trees

Appleman and Tree

dfs and similar, dp, trees

Vessels

data structures, dsu, implementation, trees

Lisa and the Martians

bitmasks, greedy, math, strings, trees

Minimum Diameter Tree

constructive algorithms, implementation, trees

The Fair Nut and the Best Path

data structures, dp, trees

New Year Tree

bitmasks, data structures, trees

Useful Decomposition

implementation, trees

Civilization

dfs and similar, dp, dsu, ternary search, trees

Police Stations

constructive algorithms, dfs and similar, dp, graphs, shortest paths, trees

Passable Paths (easy version)

dfs and similar, trees

Dominant Indices

data structures, dsu, trees

Vlad and Unfinished Business

dfs and similar, dp, greedy, trees

Hashing Trees

constructive algorithms, trees

Design Tutorial: Inverse the Problem

dfs and similar, dsu, shortest paths, trees

Omsk Metro (simple version)

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

Tree XOR

bitmasks, dfs and similar, dp, greedy, trees

Ksyusha and Chinchilla

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

1-Trees and Queries

data structures, dfs and similar, shortest paths, trees

PermuTree (easy version)

dfs and similar, dp, trees

Zero Tree

dfs and similar, dp, greedy, trees

Reset K Edges

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

Serval and Rooted Tree

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

Kuroni and the Celebration

constructive algorithms, dfs and similar, interactive, trees

Paths on the Tree

dfs and similar, dp, greedy, sortings, trees

Alyona and a tree

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

GCD Counting

data structures, dfs and similar, dp, number theory, trees

Numbers on Tree

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

LuoTianyi and the Floating Islands (Easy Version)

combinatorics, math, probabilities, trees

Passable Paths (hard version)

data structures, dfs and similar, trees

Two Paths

dfs and similar, dp, graphs, shortest paths, trees, two pointers

Send the Fool Further! (easy)

dfs and similar, graphs, trees

Guess Your Way Out!

implementation, math, trees

Danil and a Part-time Job

bitmasks, data structures, trees

Chloe and pleasant prizes

dfs and similar, dp, graphs, trees

XOR Inverse

bitmasks, data structures, divide and conquer, dp, greedy, math, sortings, strings, trees

Sasha and a Walk in the City

combinatorics, dp, math, trees

Perfect Security

data structures, greedy, strings, trees

Hanging Hearts

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

Counting Graphs

combinatorics, divide and conquer, dsu, graphs, greedy, sortings, trees

Buds Re-hanging

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

Ehab's Last Corollary

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

Garland

dfs and similar, graphs, greedy, trees

We Need More Bosses

dfs and similar, graphs, trees

Boring Segments

data structures, sortings, trees, two pointers

Valid Sets

dfs and similar, dp, math, trees

Cutting Figure

constructive algorithms, graphs, trees

Microcycle

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

Connecting Universities

dfs and similar, dp, graphs, trees

Kay and Snowflake

data structures, dfs and similar, dp, trees

Collapsing Strings

data structures, strings, trees

Anton and Tree

dfs and similar, dp, trees

Segment Tree

data structures, dsu, graphs, trees

Nauuo and Circle

combinatorics, dfs and similar, dp, trees

Li Hua and Tree

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

Duff in the Army

data structures, trees

0-1-Tree

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

Programming Competition

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

Range Sorting (Easy Version)

binary search, dp, dsu, greedy, trees, two pointers

Escape The Maze (hard version)

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

Tree Construction

data structures, trees

Vasya and a Tree

data structures, trees

Misha, Grisha and Underground

dfs and similar, graphs, trees

01 Tree

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

Brain Network (medium)

dfs and similar, graphs, trees

Edge Split

brute force, constructive algorithms, dfs and similar, dsu, graphs, probabilities, trees

Weight the Tree

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

Spiders

dp, greedy, trees

Game on Tree

implementation, math, probabilities, trees

High Load

constructive algorithms, greedy, implementation, trees

Ilya And The Tree

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

Xor Tree

binary search, bitmasks, data structures, divide and conquer, dp, trees

Puzzles

dfs and similar, math, probabilities, trees

A Growing Tree

data structures, dfs and similar, trees

Sausage Maximization

bitmasks, data structures, trees

Permutation Addicts

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

Two Chess Pieces

dfs and similar, dp, greedy, trees

Recovering BST

brute force, dp, math, number theory, trees

Equal Tree Sums

constructive algorithms, dfs and similar, math, trees

Score of a Tree

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

Kamil and Making a Stream

math, number theory, trees

Minimal Segment Cover

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

Lucky Tree

dp, dsu, trees

Count Paths

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