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

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

Kingdom Partition

flows

Chess Championship

constructive algorithms, flows, greedy, math

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

Oleg and chess

data structures, divide and conquer, flows, graph matchings

Scaygerboss

flows

Last chance

data structures, flows, graph matchings, graphs, trees

Goblins And Gnomes

brute force, dp, flows, graph matchings

Special Edges

flows, graphs

Breadboard Capacity (easy version)

dp, flows, greedy

Rainbow Triples

binary search, data structures, flows, greedy

Matching Reduction

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

Showing Off

flows, graph matchings, greedy, implementation

Shake It!

combinatorics, dp, flows, graphs

Deciphering

flows, graph matchings

Chests and Keys

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

Fishermen

flows, graph matchings, greedy

Cactusophobia

dfs and similar, flows

Nanami's Power Plant

flows

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

Making It Bipartite

flows, graph matchings, graphs, number theory

Gang Up

flows, graphs

Madoka and The First Session

constructive algorithms, flows, graph matchings, graphs, implementation

Yet Another Maxflow Problem

data structures, flows, graphs

Politics

flows, graphs

Bits of merry old England

flows, graphs

Evacuation

flows, graphs, shortest paths

Multiset of Strings

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

Heidi and Library (hard)

flows

Privatization of Roads in Berland

flows, graph matchings, graphs

The Doctor Meets Vader (Medium)

flows, graph matchings, graphs, shortest paths, sortings

Tidying Up

flows

Minimal k-covering

flows, graphs

Road Construction

flows, graphs

Horseback Riding

flows, graphs

Euclid Guess

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

New Year and Forgotten Tree

constructive algorithms, flows, graphs

ALT

data structures, flows, graphs, trees

Students Initiation

binary search, flows, graphs

Tidying Up

flows, graph matchings

Yet Another DAG Problem

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

Underfail

flows

Four Melodies

flows, graphs

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

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

The Most Reckless Defense

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

Matrix Problem

flows, graphs

Double Sort II

dfs and similar, flows, graph matchings, graphs

Strange Set

flows, math

Anti-Palindromize

flows, graphs, greedy

Exploration plan

binary search, flows, graph matchings, shortest paths

Two Melodies

dp, flows

Rectangle Painting 2

flows, graph matchings, graphs

Summoning Minions

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

Biologist

flows

Card Game

binary search, flows, graphs

Bricks

flows, graph matchings, graphs