Stock Exchange

binary search, flows, graphs

New Year and Snowy Grid

dfs and similar, dsu, graphs, interactive

JYPnation

graphs

Journey

data structures, divide and conquer, graphs, trees

Kuroni and Antihype

bitmasks, brute force, dp, dsu, graphs

Red-Blue Graph

dp, graphs, math, matrices, meet-in-the-middle

Swiper, no swiping!

graphs, implementation

Harder Satisfiability

2-sat, dfs and similar, graphs

Fake bullions

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

Tree

fft, graphs, trees

Island Puzzle

dfs and similar, dsu, graphs, trees

Complete the Permutations

combinatorics, fft, graphs, math

Can Bash Save the Day?

data structures, divide and conquer, graphs, trees

Dynamic Shortest Path

graphs, shortest paths

Tanya is 5!

graph matchings, graphs, greedy, schedules

Hex Dyslexia

bitmasks, brute force, dp, graphs

Seollal

graphs

Harry Vs Voldemort

dfs and similar, dp, graphs, trees

Gold Experience

constructive algorithms, graphs, math, number theory, probabilities

Matvey's Birthday

bitmasks, graphs

Oppa Funcan Style Remastered

graphs, math, number theory, shortest paths

Bear and Chemistry

data structures, dfs and similar, graphs, trees

Public Service

constructive algorithms, graphs, trees

Special Edges

flows, graphs

Planar Perimeter

constructive algorithms, graphs

Roads Orientation Problem

graphs

Shifting Dominoes

data structures, geometry, graphs, trees

Dirty Arkady's Kitchen

data structures, dp, graphs, shortest paths

Bimatching

graphs

Pink Floyd

graphs, interactive

Invertation in Tournament

brute force, divide and conquer, graphs, math

New Year and Social Network

data structures, graph matchings, graphs, math, trees

Election Promises

games, graphs

ALT

data structures, flows, graphs, trees

New Year and Forgotten Tree

constructive algorithms, flows, graphs

Kyoya and Train

dp, fft, graphs, math, probabilities

Tourists

data structures, dfs and similar, graphs, trees

Distance Sum

graphs

Football

graphs

Projectors

flows, graphs

Perpetual Motion Machine

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

Cow and Exercise

flows, graphs, shortest paths

String Transformation 2

bitmasks, dp, graphs, trees

Cycling City

dfs and similar, graphs

Unusual Graph

*special problem, graphs

Alpha planetary system

constructive algorithms, graphs, shortest paths

Nastya and Bees

graphs, interactive, probabilities

Spider

geometry, graphs

Gnomes of Might and Magic

data structures, graphs, implementation, shortest paths

Alice and the Cactus

dfs and similar, graphs, math, probabilities

Knightmare (hard)

graphs, interactive, shortest paths

Maximum Flow

flows, graphs

Privatization

flows, graphs

Planar Graph

flows, geometry, graphs

Wizards and Roads

data structures, divide and conquer, graph matchings, graphs, greedy

Indecisive Taxi Fee

data structures, graphs, shortest paths

James and the Chase

dfs and similar, graphs, probabilities, trees

Mike and code of a permutation

constructive algorithms, data structures, graphs, sortings

Abandoning Roads

brute force, dp, graphs, greedy

Graph Game

graphs

Coffee Varieties (hard version)

constructive algorithms, graphs, interactive

Points and Segments

graphs

The Classic Problem

data structures, graphs, shortest paths

Sergey's problem

constructive algorithms, graphs

Restore the Tree

graphs, greedy, trees

Deja Vu

constructive algorithms, graphs, implementation

Knightmare (easy)

graphs, interactive, shortest paths

Cactus to Tree

dp, graphs, trees

Take Metro

brute force, data structures, graphs

Shake It!

combinatorics, dp, flows, graphs

Almost Same Distance

dfs and similar, graphs

Upgrading Cities

dfs and similar, graphs

TOF

dfs and similar, graphs

Bear and Chase

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

Timofey and a flat tree

data structures, graphs, hashing, shortest paths, trees

Wizards and Bets

dfs and similar, graphs, math, matrices

Shortest Path Queries

bitmasks, data structures, dsu, graphs

Black Widow

dp, graphs, implementation, math

Pumping Stations

brute force, dfs and similar, divide and conquer, flows, graphs, greedy, trees

BubbleReactor

dp, graphs

Greedy Petya

*special problem, dfs and similar, graphs, greedy

The Overdosing Ubiquity

brute force, dfs and similar, graphs

Directing Edges

dfs and similar, dp, graphs, trees

Tree nesting

combinatorics, graphs, trees

Nikita and game

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

Familiar Operations

brute force, graphs, math

Coffee Varieties (easy version)

graphs, interactive

Tournament Construction

constructive algorithms, dp, graphs, greedy, math

Mister B and Flight to the Moon

constructive algorithms, graphs

Delivery Oligopoly

brute force, dp, graphs

Rearrange

brute force, constructive algorithms, graphs, greedy, sortings

Road Repairs

dfs and similar, graphs, greedy

Edge coloring of bipartite graph

graphs

Sherlock's bet to Moriarty

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

Travelling Through the Snow Queen's Kingdom

bitmasks, brute force, divide and conquer, graphs

Big Problems for Organizers

data structures, graphs, trees

Levko and Game

graphs, greedy, shortest paths

Hidden Bipartite Graph

binary search, constructive algorithms, dfs and similar, graphs, interactive

Caterpillar

dfs and similar, dp, graphs, trees

The Red Button

combinatorics, dfs and similar, dsu, graphs, greedy