Score of a Tree

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

Game on Axis

combinatorics, dfs and similar, dsu, graphs, implementation

Two Chess Pieces

dfs and similar, dp, greedy, trees

Permutation Addicts

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

Tokitsukaze and Two Colorful Tapes

constructive algorithms, dfs and similar, graphs, greedy

GCD on a grid

brute force, dfs and similar, dp, implementation, math, number theory

Shuffling Songs

bitmasks, dfs and similar, dp, graphs, hashing, implementation, strings

Misha, Grisha and Underground

dfs and similar, graphs, trees

Chemical table

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

Escape The Maze (hard version)

dfs and similar, dp, greedy, shortest paths, 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

Nauuo and Circle

combinatorics, dfs and similar, dp, trees

Kay and Snowflake

data structures, dfs and similar, dp, trees

Missile Silos

data structures, dfs and similar, graphs, shortest paths

Microcycle

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

Fish Graph

brute force, constructive algorithms, dfs and similar, graphs

Kilani and the Game

dfs and similar, graphs, implementation, shortest paths

Two Paths

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

Directed Roads

combinatorics, dfs and similar, graphs, math

Alyona and a tree

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

Paths on the Tree

dfs and similar, dp, greedy, sortings, trees

Toss a Coin to Your Graph...

binary search, dfs and similar, dp, graphs

Two Fairs

combinatorics, dfs and similar, dsu, graphs

Kuroni and the Celebration

constructive algorithms, dfs and similar, interactive, trees

Frog Traveler

data structures, dfs and similar, dp, graphs, shortest paths, two pointers

Serval and Rooted Tree

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

Nearest Excluded Points

binary search, data structures, dfs and similar, graphs, shortest paths

Reset K Edges

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

Treasure Island

dfs and similar, dp, flows, hashing

Tree XOR

bitmasks, dfs and similar, dp, greedy, trees

Design Tutorial: Inverse the Problem

dfs and similar, dsu, shortest paths, trees

Passable Paths (easy version)

dfs and similar, trees

Necklace Assembly

brute force, dfs and similar, dp, graphs, greedy, number theory

Need for Pink Slips

bitmasks, brute force, dfs and similar, implementation, math, probabilities

MinOr Tree

bitmasks, dfs and similar, dsu, graphs, greedy

A Lot of Games

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

Bandit in a City

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

Nearest Opposite Parity

dfs and similar, graphs, shortest paths

Nearest Beautiful Number (easy version)

binary search, bitmasks, brute force, constructive algorithms, dfs and similar, greedy

Gargari and Permutations

dfs and similar, dp, graphs, implementation

Cow and Fields

binary search, data structures, dfs and similar, graphs, greedy, shortest paths, sortings

Mr. Kitayuta, the Treasure Hunter

dfs and similar, dp, two pointers

Fools and Roads

data structures, dfs and similar, trees

0-1 MST

dfs and similar, dsu, graphs, sortings

Tree Tag

dfs and similar, dp, games, trees

Tree with Maximum Cost

dfs and similar, dp, trees

Dr. Evil Underscores

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

Tree Queries

dfs and similar, graphs, trees

Three-dimensional Turtle Super Computer

brute force, dfs and similar, graphs

One-Based Arithmetic

brute force, dfs and similar, divide and conquer

Disks

dfs and similar, geometry, graph matchings, graphs

Road Improvement

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

Inversions problem

brute force, dfs and similar, dp, meet-in-the-middle

Bitwise Formula

bitmasks, brute force, dfs and similar, expression parsing, implementation

Divisible by Twenty-Five

brute force, dfs and similar, dp

Moodular Arithmetic

combinatorics, dfs and similar, dsu, math, number theory

Multihedgehog

dfs and similar, graphs, shortest paths

Chamber of Secrets

dfs and similar, shortest paths

Labyrinth

dfs and similar, graphs

Cycle in Graph

dfs and similar, graphs

Connecting Universities

dfs and similar, dp, graphs, trees

Fun with Integers

dfs and similar, graphs, implementation, math

Hanging Hearts

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

Chloe and pleasant prizes

dfs and similar, dp, graphs, trees

Numbers on Tree

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

Zero Tree

dfs and similar, dp, greedy, trees

PermuTree (easy version)

dfs and similar, dp, trees

Ksyusha and Chinchilla

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

Omsk Metro (simple version)

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

Restore Graph

dfs and similar, graphs, sortings

Vlad and Unfinished Business

dfs and similar, dp, greedy, trees

Recover it!

dfs and similar, graphs, greedy, number theory, sortings

Cyclic Operations

brute force, constructive algorithms, dfs and similar, graphs, greedy, implementation

Tree Cutting (Easy Version)

dfs and similar, trees

Friendly Spiders

dfs and similar, graphs, math, number theory, shortest paths

Selling a Menagerie

dfs and similar, dsu, graphs, implementation, math

A Wide, Wide Graph

dfs and similar, dp, graphs, greedy, trees

Ugly Pairs

dfs and similar, greedy, implementation, sortings, strings

Eternal Victory

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

Maximum AND

bitmasks, dfs and similar, divide and conquer, greedy, sortings

Array Differentiation

bitmasks, brute force, constructive algorithms, dfs and similar, dp, graphs, math

Lucky Permutation

constructive algorithms, dfs and similar, graphs, greedy

Playoff Tournament

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

King's Path

dfs and similar, graphs, hashing, shortest paths

Edge Weight Assignment

bitmasks, constructive algorithms, dfs and similar, greedy, math, trees

Maximum Distributed Tree

dfs and similar, dp, greedy, implementation, math, number theory, sortings, trees

Maximum White Subtree

dfs and similar, dp, graphs, trees

Uncle Bogdan and Country Happiness

dfs and similar, greedy, math, trees

Distance in Tree

dfs and similar, dp, trees

Variable, or There and Back Again

dfs and similar, graphs

Game on Tree (Medium)

dfs and similar, dp, games, trees

Game

dfs and similar, greedy

Comments

dfs and similar, expression parsing, implementation, strings

Cycle In Maze

*special problem, dfs and similar, graphs, greedy, shortest paths

Pavel and barbecue

constructive algorithms, dfs and similar

Nephren gives a riddle

binary search, dfs and similar

Puzzles

dfs and similar, math, probabilities, trees

Phillip and Trains

dfs and similar, graphs, shortest paths

MADMAX

dfs and similar, dp, games, graphs