Excursions

*special problem, constructive algorithms, dfs and similar, flows, graph matchings, graphs

Two Avenues

data structures, dfs and similar, graphs

Battleship

*special problem, dfs and similar, implementation

Long Recovery

constructive algorithms, dfs and similar

Harry Potter and Moving Staircases

dfs and similar, implementation

Chain Letter

*special problem, dfs and similar, graphs

Biome Map

*special problem, constructive algorithms, dfs and similar, graphs

Harder Satisfiability

2-sat, dfs and similar, graphs

Function Composition

dfs and similar

Tree and Table

dfs and similar, dp, implementation, trees

Trains and Airplanes

dfs and similar, graphs, shortest paths, trees

Finding the Vertex

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

Greedy Petya

*special problem, dfs and similar, graphs, greedy

Rap God

data structures, dfs and similar, hashing, strings, trees

Organizing a Music Festival

dfs and similar, math

Colored Jenga

dfs and similar, dp, probabilities

Alphabetic Tree

binary search, data structures, dfs and similar, hashing, string suffix structures, strings, trees

Fake bullions

combinatorics, dfs and similar, dp, graphs, number theory

Alice and the Cactus

dfs and similar, graphs, math, probabilities

Just Kingdom

brute force, data structures, dfs and similar

Two Sorts

binary search, dfs and similar, math, meet-in-the-middle

Sloth

dfs and similar, dp, graph matchings, trees

Tree and Permutation Game

dfs and similar, games, graphs, trees

Bus Routes

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

New Year and Snowy Grid

dfs and similar, dsu, graphs, interactive

Suns and Rays

constructive algorithms, dfs and similar, implementation

Suns and Rays

dfs and similar, implementation

Iqea

data structures, dfs and similar, divide and conquer, dsu, shortest paths, trees

The Meeting Place Cannot Be Changed

dfs and similar, graphs

Cactus Not Enough

dfs and similar, graph matchings, graphs

Harry Vs Voldemort

dfs and similar, dp, graphs, trees

Baldman and the military

dfs and similar, graphs, trees

Tree Cutting

bitmasks, dfs and similar, dp

Escaping on Beaveractor

dfs and similar, implementation

Star Trek

*special problem, combinatorics, dfs and similar, dp, games, graphs, matrices, trees

Wavy numbers

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

Li Hua and Path

data structures, dfs and similar, divide and conquer, dsu, trees

Modernization of Treeland

*special problem, dfs and similar, trees

Palindromic Hamiltonian Path

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

Just Add an Edge

dfs and similar, dp, graphs

Island Puzzle

dfs and similar, dsu, graphs, trees

The Overdosing Ubiquity

brute force, dfs and similar, graphs

Hard Cut

constructive algorithms, dfs and similar, divide and conquer, math

Problem of offices

constructive algorithms, dfs and similar, dp, trees

Triameter

binary search, data structures, dfs and similar, trees

Send Tree to Charlie

combinatorics, dfs and similar, dsu, trees

Squid Game

data structures, dfs and similar, greedy, trees

Bitonix' Patrol

bitmasks, brute force, combinatorics, dfs and similar, math

Send the Fool Further! (hard)

dfs and similar, dp, math, trees

BHTML+BCSS

*special problem, dfs and similar, expression parsing

Chests and Keys

bitmasks, brute force, dfs and similar, dp, flows

Madness

constructive algorithms, dfs and similar, trees

Distance Matching

constructive algorithms, dfs and similar, trees

Edge Queries

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

Nikita and game

binary search, dfs and similar, divide and conquer, graphs, trees

Bear and Chase

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

Cycle

brute force, dfs and similar, implementation

Pairs

dfs and similar, dp, dsu, graphs, implementation, trees

Air Reform

data structures, dfs and similar, divide and conquer, dsu, graphs, implementation, trees

TOF

dfs and similar, graphs

Berland Miners

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

Tree Calendar

brute force, constructive algorithms, data structures, dfs and similar, sortings, trees

Berland SU Computer Network

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

Almost Same Distance

dfs and similar, graphs

Snowy Mountain

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

Delete The Edges

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

Sagheer and Kindergarten

dfs and similar, graphs, implementation, trees

Road Repairs

dfs and similar, graphs, greedy

Matching Reduction

brute force, constructive algorithms, dfs and similar, flows, graph matchings, graphs, interactive

Directing Edges

dfs and similar, dp, graphs, trees

Monsters and Diamonds

dfs and similar, graphs, shortest paths

Leaders

dfs and similar, dsu, graphs, trees

The Awesomest Vertex

data structures, dfs and similar

Game On Tree

data structures, dfs and similar, greedy, trees

Wormhouse

dfs and similar, graphs

Upgrading Tree

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

Sources and Sinks

bitmasks, brute force, dfs and similar

Spring cleaning

*special problem, data structures, dfs and similar, graphs, trees

Strongly Connected City 2

dfs and similar

Bear and Chemistry

data structures, dfs and similar, graphs, trees

Cactusophobia

dfs and similar, flows

Tiles Placement

constructive algorithms, dfs and similar, trees

Wilbur and Strings

dfs and similar, dp, graphs, strings

Pilgrims

dfs and similar, dp, trees

Down Below

binary search, dfs and similar, graphs, greedy, meet-in-the-middle, shortest paths

Two Centroids

data structures, dfs and similar, greedy, trees

Around the World

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

Ambiguous Dominoes

constructive algorithms, dfs and similar, graphs

Permutation Weight (Easy Version)

constructive algorithms, dfs and similar, dsu

The Majestic Brown Tree Snake

dfs and similar, dp, greedy, trees, two pointers

Broken Tree

dfs and similar, dp, graphs, greedy, trees

Weighting a Tree

constructive algorithms, dfs and similar, graphs

Arkady and a Nobody-men

data structures, dfs and similar, trees

Distance to the Path

data structures, dfs and similar, trees

Harry Potter and the Sorting Hat

brute force, dfs and similar, hashing

Mashtali: a Space Oddysey

constructive algorithms, dfs and similar, graphs

Omkar and Pies

bitmasks, dfs and similar, dp, math, shortest paths

A Serious Referee

bitmasks, brute force, dfs and similar, sortings

Upgrading Cities

dfs and similar, graphs

Nezzar and Hidden Permutations

constructive algorithms, dfs and similar, graphs