Tree Queries

dfs and similar, graphs, trees

Andryusha and Colored Balloons

dfs and similar, graphs, greedy, trees

Harmonious Graph

constructive algorithms, dfs and similar, dsu, graphs, greedy, sortings

Cow and Snacks

dfs and similar, dsu, graphs

New Year Permutation

dfs and similar, dsu, graphs, greedy, math, sortings

Simple Molecules

brute force, graphs, math

Choosing Capital for Treeland

dfs and similar, dp, graphs, trees

Book

binary search, brute force, data structures, dp, graphs, implementation, sortings

Cthulhu

dfs and similar, dsu, graphs

Beautiful Graph

dfs and similar, graphs

Dividing the numbers

constructive algorithms, graphs, math

TediousLee

dp, graphs, greedy, math, trees

Strongly Connected City

brute force, dfs and similar, graphs, implementation

Johnny and Contribution

constructive algorithms, graphs, greedy, sortings

Xenia and Weights

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

King's Path

dfs and similar, graphs, hashing, shortest paths

Menorah

brute force, graphs, greedy, math

Jzzhu and Cities

graphs, greedy, shortest paths

Hongcow Builds A Nation

dfs and similar, graphs

Peaceful Rooks

dfs and similar, dsu, graphs

Network Topology

graphs, implementation

Bakry and Partitioning

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

Bear and Three Musketeers

brute force, dfs and similar, graphs, hashing

Nastya and Scoreboard

bitmasks, dp, graphs, greedy

The Third Letter

dfs and similar, dsu, graphs, greedy, implementation

Christmas Trees

graphs, greedy, shortest paths

Spanning Tree with Maximum Degree

graphs

Explorer Space

dp, graphs, shortest paths

New Reform

data structures, dfs and similar, dsu, graphs, greedy

Paint the Tree

brute force, constructive algorithms, dp, graphs, implementation, trees

Love Rescue

dfs and similar, dsu, graphs, greedy, strings

String Coloring (easy version)

constructive algorithms, dp, graphs, greedy, sortings

The Number of Imposters

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

Ping-Pong (Easy Version)

dfs and similar, graphs

Labyrinth

graphs, shortest paths

Minimum Euler Cycle

constructive algorithms, graphs, greedy, implementation

Mouse Hunt

dfs and similar, graphs

Alyona and the Tree

dfs and similar, dp, graphs, trees

Chat Screenshots

combinatorics, dfs and similar, graphs

Social Network

dsu, graphs, greedy, implementation, trees

Minimum spanning tree for each edge

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

0-1 MST

dfs and similar, dsu, graphs, sortings

SlavicG's Favorite Problem

bitmasks, dfs and similar, graphs

Shichikuji and Power Grid

dsu, graphs, greedy, shortest paths, trees

Directing Edges

constructive algorithms, dfs and similar, graphs

Shifting String

graphs, math, number theory, strings

Lakes in Berland

dfs and similar, dsu, graphs, greedy, implementation

Peculiar apple-tree

dfs and similar, graphs, trees

Socks

dfs and similar, dsu, graphs, greedy

Alex's whims

constructive algorithms, graphs, greedy, shortest paths, trees

Lucky Permutation

constructive algorithms, dfs and similar, graphs, greedy

Array Differentiation

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

Tree Requests

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

Path Queries

divide and conquer, dsu, graphs, sortings, trees

Mad City

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

Unbearable Controversy of Being

brute force, combinatorics, dfs and similar, graphs

Fair

graphs, greedy, number theory, shortest paths

Candy Party (Easy Version)

bitmasks, constructive algorithms, graphs, greedy, implementation, math

Anna, Svyatoslav and Maps

dp, graphs, greedy, shortest paths

Game Master

data structures, dfs and similar, dp, graphs, greedy, two pointers

Bear and Forgotten Tree 3

constructive algorithms, graphs, trees

Reachability from the Capital

dfs and similar, graphs, greedy

Shortest Cycle

bitmasks, brute force, graphs, shortest paths

Fight Against Traffic

dfs and similar, graphs, shortest paths

Eternal Victory

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

Relatively Prime Graph

brute force, constructive algorithms, graphs, greedy, math

Strange Definition

bitmasks, graphs, hashing, math, number theory

Captain Flint and Treasure

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

Coach

brute force, dfs and similar, graphs

Shortest and Longest LIS

constructive algorithms, graphs, greedy, two pointers

A Wide, Wide Graph

dfs and similar, dp, graphs, greedy, trees

Minimum Maximum Distance

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

Cow and Fields

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

Bertown roads

dfs and similar, graphs

Gargari and Permutations

dfs and similar, dp, graphs, implementation

Roads in Berland

graphs, shortest paths

Nearest Opposite Parity

dfs and similar, graphs, shortest paths

Make It Connected

dsu, graphs, greedy

Bandit in a City

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

Selling a Menagerie

dfs and similar, dsu, graphs, implementation, math

Connected Components?

data structures, dfs and similar, dsu, graphs

Navigation System

dfs and similar, graphs, shortest paths

Friendly Spiders

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

Monopole Magnets

constructive algorithms, dfs and similar, dsu, graphs

Searching for Graph

brute force, constructive algorithms, graphs

Decorate Apple Tree

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

Journey

dp, graphs

The Tag Game

dfs and similar, graphs

Gardening Friends

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

Fix a Tree

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

Mike and Shortcuts

dfs and similar, graphs, greedy, shortest paths

MinOr Tree

bitmasks, dfs and similar, dsu, graphs, greedy

Number of Simple Paths

combinatorics, dfs and similar, graphs, trees

Water Tree

data structures, dfs and similar, graphs, trees

Legacy

data structures, graphs, shortest paths

Bicycles

graphs, greedy, implementation, shortest paths, sortings

Cyclic Operations

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

King's Task

brute force, graphs, implementation

Buy a Ticket

data structures, graphs, shortest paths

Hide and Seek

graphs