Gregor and the Pawn Game

dfs and similar, dp, flows, graph matchings, graphs, greedy, implementation

Excursions

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

Secret Santa

constructive algorithms, flows, graphs, greedy, math

Goblins And Gnomes

brute force, dp, flows, graph matchings

Armchairs

dp, flows, graph matchings, greedy

Chests and Keys

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

Starry Night Camping

constructive algorithms, flows, graphs

Button Lock

flows, graph matchings, graphs

Demonic Invasion

*special problem, flows

Paired Payment

binary search, brute force, constructive algorithms, dp, flows, graphs, shortest paths

Strange Set

flows, math

Four Points

brute force, constructive algorithms, flows, geometry, greedy, implementation, math, ternary search

Engineer Artem

2-sat, chinese remainder theorem, constructive algorithms, fft, flows

Chef Monocarp

dp, flows, graph matchings, greedy, math, sortings

Yet Another DAG Problem

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

One Billion Shades of Grey

flows, graphs

Rock, Paper, Scissors

brute force, constructive algorithms, flows, greedy, math

Valuable Paper

binary search, flows, graph matchings, graphs

Showing Off

flows, graph matchings, greedy, implementation

Rainbow Triples

binary search, data structures, flows, greedy

Bricks

flows, graph matchings, graphs

Special Edges

flows, graphs

Breadboard Capacity (easy version)

dp, flows, greedy

Summoning Minions

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

Cow and Exercise

flows, graphs, shortest paths

Red-Blue Graph

constructive algorithms, flows

Beautiful League

constructive algorithms, flows, graph matchings

Economic Difficulties

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

Road Construction

flows, graphs

Projectors

flows, graphs

Treasure Island

dfs and similar, dp, flows, hashing

Rectangle Painting 2

flows, graph matchings, graphs

Gang Up

flows, graphs

The Doctor Meets Vader (Hard)

flows, shortest paths

The Doctor Meets Vader (Medium)

flows, graph matchings, graphs, shortest paths, sortings

Stock Exchange

binary search, flows, graphs

Zoning Restrictions

dp, flows, graphs

Maximize Mex

flows, graph matchings, graphs

Alyona and a Narrow Fridge

binary search, flows, greedy, sortings

Vasya and Endless Credits

dp, flows, graph matchings, graphs, sortings

Horseback Riding

flows, graphs

Petya and Graph

flows, graphs

Privatization of Roads in Berland

flows, graph matchings, graphs

Politics

flows, graphs

Electric Scheme

flows, graph matchings

Last chance

data structures, flows, graph matchings, graphs, trees

Little C Loves 3 II

brute force, constructive algorithms, flows, graph matchings

Pisces

data structures, flows, trees

Vasya And The Matrix

constructive algorithms, flows, math

Allowed Letters

bitmasks, flows, graph matchings, graphs, greedy

Minimal k-covering

flows, graphs

Single-use Stones

binary search, flows, greedy, two pointers

Parametric Circulation

binary search, flows

Yet Another Maxflow Problem

data structures, flows, graphs

Segments Removal

data structures, dsu, flows, implementation, two pointers

Anti-Palindromize

flows, graphs, greedy

Ann and Books

data structures, flows, hashing

Almost Permutation

flows

Exploration plan

binary search, flows, graph matchings, shortest paths

Shake It!

combinatorics, dp, flows, graphs

Students Initiation

binary search, flows, graphs

Maximum Flow

flows, graphs

Four Melodies

flows, graphs

Two Melodies

dp, flows

Card Game

binary search, flows, graphs

April Fools' Problem (hard)

binary search, data structures, flows

April Fools' Problem (medium)

binary search, flows, graphs

Heidi and Library (hard)

flows

Oleg and chess

data structures, divide and conquer, flows, graph matchings

ALT

data structures, flows, graphs, trees

Gosha is hunting

brute force, data structures, dp, flows, math, probabilities, sortings

Chess Championship

constructive algorithms, flows, greedy, math

Olympiad in Programming and Sports

dp, flows, graphs, greedy

T-shirts Distribution

constructive algorithms, flows, greedy

Goods transportation

dp, flows, greedy

One-Way Reform

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

Cactusophobia

dfs and similar, flows

Underfail

flows

Incorrect Flow

flows

Captain America

flows, greedy

Delivery Bears

binary search, flows, graphs

Bear and Fair Set

flows, graphs

New Year and Forgotten Tree

constructive algorithms, flows, graphs

Soldier and Traveling

flows, graphs, math

Scaygerboss

flows

Scaygerboss

flows

Fox And Dinner

flows

Array and Operations

flows, graph matchings, number theory

Deciphering

flows, graph matchings

Flow Optimality

constructive algorithms, flows, math

Nanami's Power Plant

flows

Petya and Pipes

flows, graphs, shortest paths

Pumping Stations

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

Ciel and Duel

dp, flows, greedy

Tidying Up

flows, graph matchings

Tidying Up

flows

Biologist

flows

k-Maximum Subsequence Sum

data structures, flows, graphs, implementation

Binary Tree on Plane

flows, trees

Flawed Flow

constructive algorithms, flows, graphs, greedy