Familiar Operations

brute force, graphs, math

Cycle Palindrome

constructive algorithms, graphs, math

Jumping Through the Array

binary search, data structures, graphs, two pointers

Perpetual Motion Machine

constructive algorithms, dp, graphs, implementation, math, trees

Squares

constructive algorithms, data structures, dp, graphs, trees

Battlefield

geometry, graphs, implementation, shortest paths

Maximum Flow

flows, graphs

Doe Graphs

constructive algorithms, divide and conquer, dp, graphs, shortest paths

MCMF?

data structures, flows, graphs, greedy, sortings, two pointers

The Potion of Great Power

*special problem, 2-sat, binary search, data structures, graphs, interactive, sortings, two pointers

European Trip

dp, graphs, math, matrices

Strange Permutation

binary search, combinatorics, data structures, dp, graphs, implementation, two pointers

Amanda the Amoeba

graphs, implementation, trees, two pointers

Winning Strategy

binary search, graphs, math, shortest paths

Beautiful Tree

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

The Game of the Century

constructive algorithms, graphs, shortest paths

Hercule Poirot Problem

dsu, graphs

New Year and Social Network

data structures, graph matchings, graphs, math, trees

Reindeer Games

binary search, constructive algorithms, data structures, divide and conquer, flows, graphs, shortest paths

TOF

dfs and similar, graphs

Bear and Chase

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

Cross Xor

constructive algorithms, graphs, math, matrices

Xor Spanning Tree

divide and conquer, fft, graphs

Gold Experience

constructive algorithms, graphs, math, number theory, probabilities

Last chance

data structures, flows, graph matchings, graphs, trees

Berland SU Computer Network

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

Special Edges

flows, graphs

DIY Tree

graphs, greedy, math, probabilities

A Game With Numbers

games, graphs, shortest paths

Berland Army

constructive algorithms, graphs, greedy

Pairs

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

Delete The Edges

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

Sagheer and Kindergarten

dfs and similar, graphs, implementation, trees

Four Vertices

constructive algorithms, data structures, graphs, greedy, implementation, shortest paths

Good Colorings

binary search, constructive algorithms, graphs, interactive

Anti-Tetris

constructive algorithms, graphs, shortest paths

Almost Same Distance

dfs and similar, graphs

Monsters and Diamonds

dfs and similar, graphs, shortest paths

Matvey's Birthday

bitmasks, graphs

Gregor and the Two Painters

data structures, divide and conquer, graphs, greedy, math

Meeting Her

dp, graphs, shortest paths

Complete the Permutations

combinatorics, fft, graphs, math

Metro Scheme

graphs, greedy

Upgrading Tree

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

Tree nesting

combinatorics, graphs, trees

Road Repairs

dfs and similar, graphs, greedy

Kingdom of Islands

brute force, graphs, implementation

Wormhouse

dfs and similar, graphs

Snowy Mountain

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

Matching Reduction

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

Spring cleaning

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

Tournament-graph

constructive algorithms, graphs

Teleportation in Byteland

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

Shake It!

combinatorics, dp, flows, graphs

Pentagon

combinatorics, graphs, matrices

Hypercatapult Commute

graphs

Tournament Construction

constructive algorithms, dp, graphs, greedy, math

Magic Tricks

*special problem, dp, graphs

Graph Coloring (hard version)

brute force, combinatorics, divide and conquer, dp, fft, graphs

Leaders

dfs and similar, dsu, graphs, trees

Dirty Arkady's Kitchen

data structures, dp, graphs, shortest paths

Directing Edges

dfs and similar, dp, graphs, trees

Air Reform

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

Theft of Blueprints

graphs, math

Dima and Kicks

brute force, dsu, graphs, implementation

Wilbur and Strings

dfs and similar, dp, graphs, strings

Smooth Sailing (Hard Version)

binary search, data structures, dsu, geometry, graphs, trees

The Final Pursuit

bitmasks, constructive algorithms, divide and conquer, graphs, greedy, math

Bear and Chemistry

data structures, dfs and similar, graphs, trees

Nikita and game

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

Group Division

constructive algorithms, dfs and similar, graphs, greedy

Shifting Dominoes

data structures, geometry, graphs, trees

Delivery Oligopoly

brute force, dp, graphs

Crime Management

dp, graphs, matrices

Track

graphs, greedy, shortest paths

Keen Tree Calculation

binary search, data structures, dp, geometry, graphs, implementation, trees

Around the World

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

Sherlock's bet to Moriarty

constructive algorithms, data structures, divide and conquer, geometry, graphs, implementation, trees

Starry Night Camping

constructive algorithms, flows, graphs

Game with Points

dp, graphs, implementation, shortest paths

Maximum Waterfall

data structures, dp, graphs, sortings

Edge Queries

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

Ambiguous Dominoes

constructive algorithms, dfs and similar, graphs

Suggested Friends

brute force, graphs

Weighting a Tree

constructive algorithms, dfs and similar, graphs

Down Below

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

Doctor's Brown Hypothesis

dfs and similar, graphs, math, number theory

Broken Tree

dfs and similar, dp, graphs, greedy, trees

Policeman and a Tree

dp, graphs, trees

Mike and code of a permutation

constructive algorithms, data structures, graphs, sortings

Parcels

dp, graphs

Election Promises

games, graphs

Black Widow

dp, graphs, implementation, math

Garden

bitmasks, dp, graphs, trees

Swaps

constructive algorithms, graphs, greedy

Bridge Club

flows, graph matchings, graphs, greedy

Big Problems for Organizers

data structures, graphs, trees

Cow and Exercise

flows, graphs, shortest paths

Rain of Fire

binary search, data structures, dfs and similar, dsu, graphs, implementation

Graph Game

graphs