Stock Exchange

binary search, flows, graphs

Harder Satisfiability

2-sat, dfs and similar, graphs

Bimatching

graphs

Red-Blue Graph

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

Swiper, no swiping!

graphs, implementation

Distance Sum

graphs

New Year and Snowy Grid

dfs and similar, dsu, graphs, interactive

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

Matvey's Birthday

bitmasks, graphs

Alpha planetary system

constructive algorithms, graphs, shortest paths

Tanya is 5!

graph matchings, graphs, greedy, schedules

Seollal

graphs

Bear and Chemistry

data structures, dfs and similar, graphs, trees

Kuroni and Antihype

bitmasks, brute force, dp, dsu, graphs

Kyoya and Train

dp, fft, graphs, math, probabilities

Planar Perimeter

constructive algorithms, graphs

Projectors

flows, graphs

Oppa Funcan Style Remastered

graphs, math, number theory, shortest paths

ALT

data structures, flows, graphs, trees

Football

graphs

Optimizer

graphs, greedy, hashing, implementation

Perpetual Motion Machine

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

Gold Experience

constructive algorithms, graphs, math, number theory, probabilities

Dirty Arkady's Kitchen

data structures, dp, graphs, shortest paths

New Year and Social Network

data structures, graph matchings, graphs, math, trees

Invertation in Tournament

brute force, divide and conquer, graphs, math

Pink Floyd

graphs, interactive

Election Promises

games, graphs

Tourists

data structures, dfs and similar, graphs, trees

Unusual Graph

*special problem, graphs

Spider

geometry, graphs

Gnomes of Might and Magic

data structures, graphs, implementation, shortest paths

Deja Vu

constructive algorithms, graphs, implementation

Knightmare (hard)

graphs, interactive, shortest paths

Harry Vs Voldemort

dfs and similar, dp, graphs, trees

Planar Graph

flows, geometry, graphs

Cow and Exercise

flows, graphs, shortest paths

Nikita and game

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

Upgrading Cities

dfs and similar, graphs

New Year and Forgotten Tree

constructive algorithms, flows, graphs

Graph Game

graphs

Public Service

constructive algorithms, graphs, trees

Alice and the Cactus

dfs and similar, graphs, math, probabilities

Knightmare (easy)

graphs, interactive, shortest paths

Cactus to Tree

dp, graphs, trees

Maximum Flow

flows, graphs

Tree nesting

combinatorics, graphs, trees

Shake It!

combinatorics, dp, flows, graphs

Indecisive Taxi Fee

data structures, graphs, shortest paths

Wizards and Roads

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

Almost Same Distance

dfs and similar, graphs

Upgrading Tree

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

Shortest Path Queries

bitmasks, data structures, dsu, graphs

Bear and Chase

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

Edge coloring of bipartite graph

graphs

Abandoning Roads

brute force, dp, graphs, greedy

Coffee Varieties (hard version)

constructive algorithms, graphs, interactive

Wizards and Bets

dfs and similar, graphs, math, matrices

Wilbur and Strings

dfs and similar, dp, graphs, strings

Broken Tree

dfs and similar, dp, graphs, greedy, trees

The Classic Problem

data structures, graphs, shortest paths

Points and Segments

graphs

Tanya and Password

dfs and similar, graphs

BubbleReactor

dp, graphs

Restore the Tree

graphs, greedy, trees

Greedy Petya

*special problem, dfs and similar, graphs, greedy

The Overdosing Ubiquity

brute force, dfs and similar, graphs

The Meeting Place Cannot Be Changed

dfs and similar, graphs

Take Metro

brute force, data structures, graphs

Leaders

dfs and similar, dsu, graphs, trees

A Game With Numbers

games, graphs, shortest paths

Metro Scheme

graphs, greedy

Mister B and Flight to the Moon

constructive algorithms, graphs

Berland Army

constructive algorithms, graphs, greedy

TOF

dfs and similar, graphs

Forced Online Queries Problem

data structures, divide and conquer, dsu, graphs, trees

Timofey and a flat tree

data structures, graphs, hashing, shortest paths, trees

Road Repairs

dfs and similar, graphs, greedy

Politics

flows, graphs

Black Widow

dp, graphs, implementation, math

Foolprüf Security

graphs

Pumping Stations

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

Levko and Game

graphs, greedy, shortest paths

Cycling City

dfs and similar, graphs

Magical Permutation

bitmasks, brute force, constructive algorithms, data structures, graphs, math

Singer House

combinatorics, dp, graphs, trees

Vicky's Delivery Service

data structures, dsu, graphs, hashing

Tree

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

Johnny Solving

constructive algorithms, dfs and similar, graphs, math

k-Maximum Subsequence Sum

data structures, flows, graphs, implementation

Sergey's problem

constructive algorithms, graphs

Tournament

data structures, graphs

Museums Tour

dp, graphs, implementation

Axel and Marston in Bitland

bitmasks, dp, graphs, matrices

Kingdom and its Cities

dfs and similar, divide and conquer, dp, graphs, sortings, trees

Case of Computer Network

dfs and similar, graphs, trees

Little Pony and Summer Sun Celebration

constructive algorithms, dfs and similar, graphs