Vessels

data structures, dsu, implementation, trees

The Fair Nut and the Best Path

data structures, dp, trees

Vlad and Unfinished Business

dfs and similar, dp, greedy, trees

Omsk Metro (simple version)

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

Ksyusha and Chinchilla

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

PermuTree (easy version)

dfs and similar, dp, trees

Zero Tree

dfs and similar, dp, greedy, 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

Chloe and pleasant prizes

dfs and similar, dp, graphs, trees

Perfect Security

data structures, greedy, strings, trees

Hanging Hearts

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

Connecting Universities

dfs and similar, dp, graphs, trees

Tree Construction

data structures, trees

High Load

constructive algorithms, greedy, implementation, trees

Dungeons and Candies

dsu, graphs, greedy, trees

4-point polyline

brute force, constructive algorithms, geometry, trees

Road Improvement

*special problem, dfs and similar, graphs, greedy, trees

Roads not only in Berland

dsu, graphs, trees

Enemy is weak

data structures, trees

Tree Queries

dfs and similar, graphs, trees

TediousLee

dp, graphs, greedy, math, trees

Dr. Evil Underscores

bitmasks, brute force, dfs and similar, divide and conquer, dp, greedy, strings, trees

Tree with Maximum Cost

dfs and similar, dp, trees

Tree Tag

dfs and similar, dp, games, trees

Shichikuji and Power Grid

dsu, graphs, greedy, shortest paths, trees

Fools and Roads

data structures, dfs and similar, trees

Bandit in a City

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

A Lot of Games

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

XOR Construction

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

Passable Paths (easy version)

dfs and similar, trees

Design Tutorial: Inverse the Problem

dfs and similar, dsu, shortest paths, trees

Tree XOR

bitmasks, 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

Alyona and a tree

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

Paths on the Tree

dfs and similar, dp, greedy, sortings, trees

Two Paths

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

Sasha and a Walk in the City

combinatorics, dp, math, trees

Collapsing Strings

data structures, strings, trees

Microcycle

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

Kay and Snowflake

data structures, dfs and similar, dp, trees

Nauuo and Circle

combinatorics, dfs and similar, dp, trees

Programming Competition

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

Li Hua and Tree

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

Escape The Maze (hard version)

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

Misha, Grisha and Underground

dfs and similar, graphs, trees

Vasya and a Tree

data structures, trees

Permutation Addicts

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

Two Chess Pieces

dfs and similar, dp, greedy, trees

Score of a Tree

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

Lucky Tree

dp, dsu, trees

Build a Tree and That Is It

constructive algorithms, implementation, trees

Generating Sets

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

New Year Santa Network

combinatorics, dfs and similar, graphs, trees

Vlad and Trouble at MIT

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

Exposition

binary search, data structures, dsu, trees, two pointers

Bank Hacking

constructive algorithms, data structures, dp, trees

Unusual Entertainment

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

Paths in a Complete Binary Tree

bitmasks, trees

Shark

brute force, data structures, dsu, trees

Privatization of Roads in Treeland

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

Daleks' Invasion (easy)

graphs, trees

Intersecting Subtrees

dfs and similar, interactive, trees

Old Berland Language

data structures, greedy, trees

Annual Ants' Gathering

dfs and similar, dp, greedy, trees

Game on Tree (Hard)

dfs and similar, dp, games, trees

Min-Fund Prison (Easy)

dfs and similar, trees

Autocompletion

*special problem, strings, trees

Tree Shuffling

dfs and similar, dp, greedy, trees

Captain Flint and Treasure

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

Propagating tree

data structures, dfs and similar, trees

Book of Evil

dfs and similar, divide and conquer, dp, trees

Weights Division (easy version)

data structures, dfs and similar, greedy, trees

Number of Simple Paths

combinatorics, dfs and similar, graphs, trees

Three Paths on a Tree

dfs and similar, dp, greedy, trees

Appleman and Tree

dfs and similar, dp, trees

1-Trees and Queries

data structures, dfs and similar, shortest paths, trees

GCD Counting

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

Passable Paths (hard version)

data structures, dfs and similar, trees

Danil and a Part-time Job

bitmasks, data structures, trees

XOR Inverse

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

Counting Graphs

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

Buds Re-hanging

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

Garland

dfs and similar, graphs, greedy, trees

Range Sorting (Easy Version)

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

Weight the Tree

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

Edge Split

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

A Growing Tree

data structures, dfs and similar, trees

Ilya And The Tree

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

Count Paths

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

Kamil and Making a Stream

math, number theory, trees

Circular Spanning Tree

constructive algorithms, implementation, trees

Pillars

binary search, data structures, dp, sortings, trees

Sergey and Subway

dfs and similar, dp, trees

Vlad and the Mountains

binary search, data structures, dsu, graphs, implementation, sortings, trees, two pointers

Sum Graph

brute force, constructive algorithms, graphs, implementation, interactive, shortest paths, trees

Lynyrd Skynyrd

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

Choosing The Commander

bitmasks, data structures, trees