Chain Letter

*special problem, dfs and similar, graphs

Legacy

data structures, graphs, shortest paths

Minimal Labels

data structures, dfs and similar, graphs, greedy

Centroids

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

Double Profiles

graphs, hashing, sortings

Complete The Graph

binary search, constructive algorithms, graphs, shortest paths

Returning Home

graphs, shortest paths, sortings

Garden of the Sun

constructive algorithms, graphs

Tree Array

brute force, combinatorics, dp, graphs, math, probabilities, trees

Keshi in Search of AmShZ

graphs, greedy, shortest paths

Edges in MST

dfs and similar, dsu, graphs, sortings

Omkar and Forest

combinatorics, graphs, math, shortest paths

Pattern Matching

bitmasks, data structures, dfs and similar, graphs, hashing, sortings, strings

Tourist Reform

dfs and similar, graphs

Envy

data structures, dsu, graphs

Instant Noodles

graphs, hashing, math, number theory

The Great Mixing

dfs and similar, graphs, shortest paths

Arithmetic Operations

brute force, data structures, graphs, math

Pursuit For Artifacts

dfs and similar, dsu, graphs, trees

Robot on the Board 2

brute force, dfs and similar, graphs, implementation

Lost Array

graphs, greedy, interactive, shortest paths

Boboniu Walks on Graph

brute force, dfs and similar, graphs, hashing

Number of Groups

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

Delete a Segment

brute force, constructive algorithms, data structures, dp, graphs, sortings, trees, two pointers

Yet Another Segments Subset

data structures, dp, graphs, sortings

Scheme

dfs and similar, graphs, trees

Vanya and Treasure

data structures, dp, graphs, shortest paths

Modular Sequence

brute force, constructive algorithms, dp, graphs, greedy, math, number theory

Jellyfish and EVA

dp, graphs, greedy, math, probabilities

Shortest Path Problem?

dfs and similar, graphs, math

Looksery Party

constructive algorithms, dfs and similar, graphs, greedy

Sasha and the Happy Tree Cutting

bitmasks, brute force, dfs and similar, dp, graphs, greedy, math, trees

Wizard's Tour

constructive algorithms, dfs and similar, graphs

Infinite Card Game

binary search, brute force, data structures, dfs and similar, dp, dsu, games, graphs, greedy, sortings, two pointers

st-Spanning Tree

dsu, graphs, greedy, implementation

Graph Cutting

dfs and similar, graphs

Columns Swaps

2-sat, dfs and similar, dsu, graphs, implementation

Tourism

dp, graphs, probabilities

Light Bulbs (Hard Version)

combinatorics, data structures, dfs and similar, dp, graphs, hashing

Vulnerable Kerbals

constructive algorithms, dp, graphs, math, number theory

Bipartite Segments

binary search, data structures, dfs and similar, dsu, graphs, two pointers

Ann and Half-Palindrome

data structures, dp, graphs, string suffix structures, strings, trees

Tokens on Graph

constructive algorithms, dfs and similar, graphs, shortest paths

Interestring graph and Apples

dfs and similar, dsu, graphs

Points, Lines and Ready-made Titles

dfs and similar, dsu, graphs, trees

Nudist Beach

binary search, graphs, greedy

Graph Traveler

brute force, data structures, dfs and similar, dp, graphs, implementation, math, number theory

Similar Sets

data structures, graphs, implementation

Take-off Ramps

graphs, shortest paths

Moving Platforms

graphs, math, number theory, shortest paths

Ski Base

combinatorics, dsu, graphs

Beautiful Road

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

Clearing Up

constructive algorithms, dp, dsu, graphs

The Coronation

graphs, implementation

Petya and Pipes

flows, graphs, shortest paths

Santa Clauses and a Soccer Championship

constructive algorithms, dfs and similar, graphs, trees

Hyperspace Highways

dfs and similar, graphs, trees

Horseback Riding

flows, graphs

Road Construction

flows, graphs

Dating

brute force, dfs and similar, graphs, trees

Evacuation

flows, graphs, shortest paths

Widget Library

dp, expression parsing, graphs, implementation

Rats

brute force, dfs and similar, graphs, implementation, shortest paths

Dima and Kicks

brute force, dsu, graphs, implementation

Spring cleaning

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

Wormhouse

dfs and similar, graphs

Hercule Poirot Problem

dsu, graphs

kotlinkotlinkotlinkotlin...

*special problem, graphs, implementation, strings

Собери число

graphs, shortest paths

Minimum Path

graphs, shortest paths

The Shortest Statement

graphs, shortest paths, trees

Imbalance Value of a Tree

data structures, dsu, graphs, trees

Nastya and Unexpected Guest

dfs and similar, dp, graphs, shortest paths

Mr. Kitayuta's Colorful Graph

brute force, dfs and similar, dsu, graphs

Petya and Graph

flows, graphs

Avoid Rainbow Cycles

data structures, dsu, graphs, greedy, sortings, trees

Catowice City

2-sat, dfs and similar, graph matchings, graphs

Fedor and Essay

dfs and similar, dp, graphs, hashing, strings

Make It Connected

binary search, brute force, constructive algorithms, dsu, graphs, greedy, matrices, trees, two pointers

Anya's Simultaneous Exhibition

constructive algorithms, graphs, greedy, interactive, sortings

Great Grids

2-sat, constructive algorithms, dfs and similar, dsu, graphs

The Beach

constructive algorithms, dfs and similar, graphs, shortest paths

A-Z Graph

constructive algorithms, data structures, graphs, hashing

Maximize Mex

flows, graph matchings, graphs

Arthur and Walls

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

Cactus Wall

constructive algorithms, dfs and similar, graphs, shortest paths

Long Way Home

data structures, divide and conquer, dp, geometry, graphs, greedy, shortest paths

Fair Share

constructive algorithms, data structures, dfs and similar, graph matchings, graphs

Graph Transpositions

dfs and similar, graphs, greedy, shortest paths

Tree Destruction

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

Prefix Enlightenment

dfs and similar, dsu, graphs

Session in BSU

binary search, dfs and similar, dsu, graph matchings, graphs

Walk the Runway

bitmasks, brute force, data structures, dp, graphs, implementation, sortings

Sum Balance

bitmasks, dfs and similar, dp, graphs

Useful Edges

graphs, shortest paths

Spanning Tree Queries

binary search, data structures, dfs and similar, dsu, graphs, greedy, math, sortings, trees

Plan of Lectures

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

Ehab and the Big Finale

constructive algorithms, divide and conquer, graphs, implementation, interactive, trees

Konrad and Company Evaluation

graphs

Purple Crayon

data structures, dfs and similar, games, graphs, greedy, math, sortings, trees