Misha, Grisha and Underground

dfs and similar, graphs, trees

Vasya and a Tree

data structures, trees

Escape The Maze (hard version)

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

Programming Competition

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

Range Sorting (Easy Version)

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

Duff in the Army

data structures, trees

Li Hua and Tree

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

Microcycle

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

Collapsing Strings

data structures, strings, trees

Nauuo and Circle

combinatorics, dfs and similar, dp, trees

Segment Tree

data structures, dsu, graphs, trees

Anton and Tree

dfs and similar, dp, trees

Kay and Snowflake

data structures, dfs and similar, dp, trees

Connecting Universities

dfs and similar, dp, graphs, trees

Cutting Figure

constructive algorithms, graphs, trees

Valid Sets

dfs and similar, dp, math, trees

Boring Segments

data structures, sortings, trees, two pointers

We Need More Bosses

dfs and similar, graphs, trees

Garland

dfs and similar, graphs, greedy, 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

Counting Graphs

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

Sasha and a Walk in the City

combinatorics, dp, math, trees

Hanging Hearts

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

Perfect Security

data structures, greedy, strings, trees

XOR Inverse

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

Danil and a Part-time Job

bitmasks, data structures, trees

Chloe and pleasant prizes

dfs and similar, dp, graphs, trees

Send the Fool Further! (easy)

dfs and similar, graphs, trees

Passable Paths (hard version)

data structures, dfs and similar, trees

Guess Your Way Out!

implementation, math, trees

Two Paths

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

LuoTianyi and the Floating Islands (Easy Version)

combinatorics, math, probabilities, trees

Numbers on Tree

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

GCD Counting

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

Kuroni and the Celebration

constructive algorithms, dfs and similar, interactive, trees

Serval and Rooted Tree

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

1-Trees and Queries

data structures, dfs and similar, shortest paths, trees

Reset K Edges

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

PermuTree (easy version)

dfs and similar, dp, trees

Zero Tree

dfs and similar, dp, greedy, trees

Ksyusha and Chinchilla

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

Tree XOR

bitmasks, dfs and similar, dp, greedy, trees

Omsk Metro (simple version)

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

Design Tutorial: Inverse the Problem

dfs and similar, dsu, shortest paths, trees

Vlad and Unfinished Business

dfs and similar, dp, greedy, trees

Hashing Trees

constructive algorithms, trees

Dominant Indices

data structures, dsu, trees

Passable Paths (easy version)

dfs and similar, trees

Useful Decomposition

implementation, trees

Police Stations

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

Civilization

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

New Year Tree

bitmasks, data structures, trees

The Fair Nut and the Best Path

data structures, dp, trees

Lisa and the Martians

bitmasks, greedy, math, strings, trees

Minimum Diameter Tree

constructive algorithms, implementation, trees

Vessels

data structures, dsu, implementation, trees

Appleman and Tree

dfs and similar, dp, trees

Three Paths on a Tree

dfs and similar, dp, greedy, trees

Water Tree

data structures, dfs and similar, graphs, trees

Petya and Catacombs

dsu, greedy, implementation, trees

Number of Simple Paths

combinatorics, dfs and similar, graphs, trees

Misha and Forest

constructive algorithms, data structures, greedy, sortings, trees

Gardening Friends

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

XOR Construction

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

Tree Cutting (Easy Version)

dfs and similar, trees

Fix a Tree

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

Decorate Apple Tree

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

A Lot of Games

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

Weights Division (easy version)

data structures, dfs and similar, greedy, trees

Mahmoud and Ehab and the wrong algorithm

constructive algorithms, trees

Xor-Subsequence (easy version)

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

Bmail Computer Network

*special problem, dfs and similar, trees

Lost Tree

constructive algorithms, interactive, trees

Book of Evil

dfs and similar, divide and conquer, dp, trees

Bandit in a City

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

Minimum Maximum Distance

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

Lorenzo Von Matterhorn

brute force, data structures, implementation, trees

A Wide, Wide Graph

dfs and similar, dp, graphs, greedy, trees

Blood Cousins

binary search, data structures, dfs and similar, trees

Kuro and Walking Route

dfs and similar, trees

Propagating tree

data structures, dfs and similar, trees

Captain Flint and Treasure

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

Interesting Array

constructive algorithms, data structures, trees

A and B and Lecture Rooms

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

Tree and Queries

data structures, dfs and similar, trees

Eternal Victory

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

Bear and Forgotten Tree 3

constructive algorithms, graphs, trees

Tree Shuffling

dfs and similar, dp, greedy, trees

Mad City

dfs and similar, dsu, games, graphs, shortest paths, trees

Okabe and Boxes

data structures, greedy, trees

Alex's whims

constructive algorithms, graphs, greedy, shortest paths, trees

Path Queries

divide and conquer, dsu, graphs, sortings, trees

Tree Requests

binary search, bitmasks, constructive algorithms, dfs and similar, graphs, trees

Fools and Roads

data structures, dfs and similar, trees

Peculiar apple-tree

dfs and similar, graphs, trees

Ciel the Commander

constructive algorithms, dfs and similar, divide and conquer, greedy, trees

Shichikuji and Power Grid

dsu, graphs, greedy, shortest paths, trees