Demonic Invasion

*special problem, flows

Excursions

*special problem, constructive algorithms, dfs and similar, flows, graph matchings, graphs

Growing Trees

binary search, constructive algorithms, flows, graphs, greedy

Farmer John's Favorite Intern

data structures, dp, flows, trees

Pills

brute force, flows

Olympiad Training

binary search, data structures, dp, flows, geometry, implementation, sortings

Flow Optimality

constructive algorithms, flows, math

Panda Meetups

data structures, dp, flows

Parametric Circulation

binary search, flows

Pisces

data structures, flows, trees

Conference

data structures, flows

The Doctor Meets Vader (Hard)

flows, shortest paths

Two Characters, Two Colors

binary search, data structures, dp, flows, greedy

Chess Championship

constructive algorithms, flows, greedy, math

Projectors

flows, graphs

Four Suits

binary search, bitmasks, flows, greedy

Planar Graph

flows, geometry, graphs

Privatization

flows, graphs

Stock Exchange

binary search, flows, graphs

World Evil

dp, flows

Training Camp

flows, graphs

Kingdom Partition

flows

MCF

flows

MCMF?

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

Maximum Flow

flows, graphs

Electric Scheme

flows, graph matchings

Scaygerboss

flows

Reindeer Games

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

Goblins And Gnomes

brute force, dp, flows, graph matchings

One Billion Shades of Grey

flows, graphs

Scaygerboss

flows

Breadboard Capacity (easy version)

dp, flows, greedy

Special Edges

flows, graphs

Oleg and chess

data structures, divide and conquer, flows, graph matchings

Shake It!

combinatorics, dp, flows, graphs

Matching Reduction

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

Last chance

data structures, flows, graph matchings, graphs, trees

Rainbow Triples

binary search, data structures, flows, greedy

Cactusophobia

dfs and similar, flows

Chests and Keys

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

Deciphering

flows, graph matchings

Nanami's Power Plant

flows

Fishermen

flows, graph matchings, greedy

Showing Off

flows, graph matchings, greedy, implementation

Dominoes

combinatorics, flows, graph matchings, greedy

Red-Blue Graph

constructive algorithms, flows

Starry Night Camping

constructive algorithms, flows, graphs

Bridge Club

flows, graph matchings, graphs, greedy

Cow and Exercise

flows, graphs, shortest paths

Gang Up

flows, graphs

Yet Another Maxflow Problem

data structures, flows, graphs

Politics

flows, graphs

Madoka and The First Session

constructive algorithms, flows, graph matchings, graphs, implementation

Bits of merry old England

flows, graphs

Evacuation

flows, graphs, shortest paths

Making It Bipartite

flows, graph matchings, graphs, number theory

Multiset of Strings

bitmasks, brute force, dp, fft, flows, graphs, math, meet-in-the-middle, trees

Heidi and Library (hard)

flows

Tidying Up

flows

Minimal k-covering

flows, graphs

The Doctor Meets Vader (Medium)

flows, graph matchings, graphs, shortest paths, sortings

Road Construction

flows, graphs

New Year and Forgotten Tree

constructive algorithms, flows, graphs

Horseback Riding

flows, graphs

Privatization of Roads in Berland

flows, graph matchings, graphs

Euclid Guess

constructive algorithms, flows, graph matchings, math, number theory

ALT

data structures, flows, graphs, trees

Tidying Up

flows, graph matchings

Students Initiation

binary search, flows, graphs

Underfail

flows

Four Melodies

flows, graphs

Yet Another DAG Problem

bitmasks, dfs and similar, dp, flows, graphs, math

Access Levels

bitmasks, dsu, flows, graph matchings

Alice and Recoloring 2

constructive algorithms, flows, graph matchings, greedy

Pumping Stations

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

Incorrect Flow

flows

Button Lock

flows, graph matchings, graphs

Vasya and Endless Credits

dp, flows, graph matchings, graphs, sortings

Bear and Fair Set

flows, graphs

Beautiful League

constructive algorithms, flows, graph matchings

Wine Factory (Hard Version)

data structures, dp, flows, greedy, matrices

Allowed Letters

bitmasks, flows, graph matchings, graphs, greedy

Captain America

flows, greedy

Petya and Pipes

flows, graphs, shortest paths

Zoning Restrictions

dp, flows, graphs

Buying Sets

flows, graph matchings

Economic Difficulties

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

Machine Programming

flows, graphs

April Fools' Problem (hard)

binary search, data structures, flows

Strange Set

flows, math

Matrix Problem

flows, graphs

Exploration plan

binary search, flows, graph matchings, shortest paths

Double Sort II

dfs and similar, flows, graph matchings, graphs

Two Melodies

dp, flows

Anti-Palindromize

flows, graphs, greedy

Biologist

flows

Card Game

binary search, flows, graphs

April Fools' Problem (medium)

binary search, flows, graphs

The Most Reckless Defense

bitmasks, brute force, constructive algorithms, dp, flows, graph matchings, shortest paths

Rectangle Painting 2

flows, graph matchings, graphs