Demonic Invasion

*special problem, flows

Growing Trees

binary search, constructive algorithms, flows, graphs, greedy

Excursions

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

Farmer John's Favorite Intern

data structures, dp, flows, trees

Conference

data structures, flows

Flow Optimality

constructive algorithms, flows, math

Pills

brute force, flows

Olympiad Training

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

Parametric Circulation

binary search, flows

Panda Meetups

data structures, dp, flows

Pisces

data structures, flows, trees

Four Suits

binary search, bitmasks, flows, greedy

Projectors

flows, graphs

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

Kingdom Partition

flows

Privatization

flows, graphs

Planar Graph

flows, geometry, graphs

Training Camp

flows, graphs

Stock Exchange

binary search, flows, graphs

World Evil

dp, flows

MCF

flows

One Billion Shades of Grey

flows, graphs

Maximum Flow

flows, graphs

MCMF?

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

Scaygerboss

flows

Electric Scheme

flows, graph matchings

Reindeer Games

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

Scaygerboss

flows

Goblins And Gnomes

brute force, dp, flows, graph matchings

Special Edges

flows, graphs

Last chance

data structures, flows, graph matchings, graphs, trees

Breadboard Capacity (easy version)

dp, flows, greedy

Rainbow Triples

binary search, data structures, flows, greedy

Oleg and chess

data structures, divide and conquer, flows, graph matchings

Matching Reduction

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

Shake It!

combinatorics, dp, flows, graphs

Showing Off

flows, graph matchings, greedy, implementation

Chests and Keys

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

Cactusophobia

dfs and similar, flows

Nanami's Power Plant

flows

Deciphering

flows, graph matchings

Fishermen

flows, graph matchings, greedy

Starry Night Camping

constructive algorithms, flows, graphs

Dominoes

combinatorics, flows, graph matchings, greedy

Red-Blue Graph

constructive algorithms, flows

Bridge Club

flows, graph matchings, graphs, greedy

Cow and Exercise

flows, graphs, shortest paths

Gang Up

flows, graphs

Making It Bipartite

flows, graph matchings, graphs, number theory

Yet Another Maxflow Problem

data structures, flows, graphs

Madoka and The First Session

constructive algorithms, flows, graph matchings, graphs, implementation

Politics

flows, graphs

Bits of merry old England

flows, graphs

Heidi and Library (hard)

flows

Evacuation

flows, graphs, shortest paths

Privatization of Roads in Berland

flows, graph matchings, graphs

Multiset of Strings

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

Tidying Up

flows

Minimal k-covering

flows, graphs

The Doctor Meets Vader (Medium)

flows, graph matchings, graphs, shortest paths, sortings

Road Construction

flows, graphs

Horseback Riding

flows, graphs

New Year and Forgotten Tree

constructive algorithms, flows, graphs

Euclid Guess

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

ALT

data structures, flows, graphs, trees

Students Initiation

binary search, flows, graphs

Tidying Up

flows, graph matchings

Underfail

flows

Yet Another DAG Problem

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

Four Melodies

flows, graphs

Alice and Recoloring 2

constructive algorithms, flows, graph matchings, greedy

Access Levels

bitmasks, dsu, flows, graph matchings

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

Wine Factory (Hard Version)

data structures, dp, flows, greedy, matrices

Beautiful League

constructive algorithms, flows, graph matchings

Allowed Letters

bitmasks, flows, graph matchings, graphs, greedy

Captain America

flows, greedy

Zoning Restrictions

dp, flows, graphs

Petya and Pipes

flows, graphs, shortest paths

Buying Sets

flows, graph matchings

April Fools' Problem (hard)

binary search, data structures, flows

Economic Difficulties

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

Machine Programming

flows, graphs

Matrix Problem

flows, graphs

Strange Set

flows, math

Anti-Palindromize

flows, graphs, greedy

Exploration plan

binary search, flows, graph matchings, shortest paths

Double Sort II

dfs and similar, flows, graph matchings, graphs

Two Melodies

dp, flows

Summoning Minions

constructive algorithms, dp, flows, graph matchings, greedy, sortings

The Most Reckless Defense

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

Biologist

flows

Bricks

flows, graph matchings, graphs

Card Game

binary search, flows, graphs