Daleks' Invasion (easy)

graphs, trees

The Doctor Meets Vader (Medium)

flows, graph matchings, graphs, shortest paths, sortings

Subsequences (easy version)

dp, graphs, implementation, shortest paths

Stock Exchange

binary search, flows, graphs

Cover it!

dfs and similar, dsu, graphs, shortest paths, trees

Recover it!

dfs and similar, graphs, greedy, number theory, sortings

Ehab and the Big Finale

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

Graph Decomposition

*special problem, graphs

Pairs

graphs, implementation

News Distribution

dfs and similar, dsu, graphs

Vicky's Delivery Service

data structures, dsu, graphs, hashing

Indecisive Taxi Fee

data structures, graphs, shortest paths

Magical Permutation

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

Permutation recovery

constructive algorithms, data structures, dfs and similar, graphs, greedy, math, sortings

Optimizer

graphs, greedy, hashing, implementation

Delivery Oligopoly

brute force, dp, graphs

Neko and Flashback

constructive algorithms, dfs and similar, graphs

Election Promises

games, graphs

Abandoning Roads

brute force, dp, graphs, greedy

Gold Experience

constructive algorithms, graphs, math, number theory, probabilities

Palindrome XOR

dfs and similar, graphs

Hide and Seek

graphs

Zoning Restrictions

dp, flows, graphs

Tree Diameter

bitmasks, graphs, interactive

Graph Without Long Directed Paths

dfs and similar, graphs

Pink Floyd

graphs, interactive

Privatization of Roads in Treeland

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

Maximize Mex

flows, graph matchings, graphs

Edgy Trees

dfs and similar, dsu, graphs, math, trees

Museums Tour

dp, graphs, implementation

Spanning Tree with One Fixed Degree

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

Spanning Tree with Maximum Degree

graphs

Gourmet choice

dfs and similar, dp, dsu, graphs, greedy

Power Tree

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

Tree

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

MST Unification

binary search, dsu, graphs, greedy

Vasya and Endless Credits

dp, flows, graph matchings, graphs, sortings

Lunar New Year and a Wander

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

Kilani and the Game

dfs and similar, graphs, implementation, shortest paths

Johnny Solving

constructive algorithms, dfs and similar, graphs, math

Elongated Matrix

binary search, bitmasks, brute force, dp, graphs

Andrew and Taxi

binary search, dfs and similar, graphs

Construct a tree

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

Make It Connected

dsu, graphs, greedy

Beautiful Graph

dfs and similar, graphs

New Year and the Acquaintance Estimation

binary search, data structures, graphs, greedy, implementation, math, sortings

Linearization

graphs

Horseback Riding

flows, graphs

Minegraphed

constructive algorithms, graphs

Harder Satisfiability

2-sat, dfs and similar, graphs

Distance Sum

graphs

Bimatching

graphs

Petya and Graph

flows, graphs

Maximum Diameter Graph

constructive algorithms, graphs, implementation

Maximum Distance

dsu, graphs, shortest paths, sortings

Edge Deletion

graphs, greedy, shortest paths

Privatization of Roads in Berland

flows, graph matchings, graphs

Find a Number

dp, graphs, number theory, shortest paths

Colored Rooks

constructive algorithms, graphs

Multihedgehog

dfs and similar, graphs, shortest paths

Vasya and Isolated Vertices

constructive algorithms, graphs

Labyrinth

graphs, shortest paths

Upgrading Cities

dfs and similar, graphs

Fun with Integers

dfs and similar, graphs, implementation, math

Politics

flows, graphs

Take Metro

brute force, data structures, graphs

Decorate Apple Tree

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

Metro

graphs

The Shortest Statement

graphs, shortest paths, trees

Hyperspace Highways

dfs and similar, graphs, trees

Last chance

data structures, flows, graph matchings, graphs, trees

Leaf Sets

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

Tree Reconstruction

constructive algorithms, data structures, graphs, greedy

Network Safety

dfs and similar, dsu, graphs, math, sortings

Maximum Matching

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

Trips

graphs

Valid BFS?

dfs and similar, graphs, shortest paths, trees

Hidden Bipartite Graph

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

King Escape

dfs and similar, graphs, implementation

Familiar Operations

brute force, graphs, math

Tree with Small Distances

dp, graphs, greedy

Session in BSU

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

Mouse Hunt

dfs and similar, graphs

Mobile Phone Network

dfs and similar, dsu, graphs, trees

Badge

brute force, dfs and similar, graphs

Sergey's problem

constructive algorithms, graphs

Chemical table

constructive algorithms, dfs and similar, dsu, graphs, matrices

Tree

fft, graphs, trees

Mars rover

dfs and similar, graphs, implementation, trees

Allowed Letters

bitmasks, flows, graph matchings, graphs, greedy

Relatively Prime Graph

brute force, constructive algorithms, graphs, greedy, math

Military Problem

dfs and similar, graphs, trees

Berland and the Shortest Paths

brute force, dfs and similar, graphs, shortest paths

Tree Constructing

constructive algorithms, graphs

We Need More Bosses

dfs and similar, graphs, trees

Reachability from the Capital

dfs and similar, graphs, greedy

Number Clicker

divide and conquer, graphs, meet-in-the-middle, number theory

Graph And Its Complement

constructive algorithms, graphs, implementation

A Mist of Florescence

constructive algorithms, graphs

Oppa Funcan Style Remastered

graphs, math, number theory, shortest paths