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

Projectors

flows, graphs

Road Construction

flows, graphs

Treasure Island

dfs and similar, dp, flows, hashing

Rectangle Painting 2

flows, graph matchings, graphs

Stock Exchange

binary search, flows, graphs

The Doctor Meets Vader (Hard)

flows, shortest paths

The Doctor Meets Vader (Medium)

flows, graph matchings, graphs, shortest paths, sortings

Gang Up

flows, graphs

Zoning Restrictions

dp, flows, graphs

Alyona and a Narrow Fridge

binary search, flows, greedy, sortings

Maximize Mex

flows, graph matchings, graphs

Vasya and Endless Credits

dp, flows, graph matchings, graphs, sortings

Horseback Riding

flows, graphs

Politics

flows, graphs

Privatization of Roads in Berland

flows, graphs

Electric Scheme

flows, graph matchings

Last chance

data structures, flows, graph matchings, 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

Parametric Circulation

binary search, flows

Single-use Stones

binary search, flows, greedy, two pointers

Segments Removal

data structures, dsu, flows, implementation, two pointers

Yet Another Maxflow Problem

data structures, flows, graphs

Anti-Palindromize

flows, graphs, greedy

Ann and Books

data structures, flows, hashing

Almost Permutation

flows

Students Initiation

binary search, flows

Exploration plan

binary search, flows, graph matchings, shortest paths

Shake It!

combinatorics, dp, flows, graphs

Maximum Flow

flows, graphs

Four Melodies

flows, graphs

Two Melodies

dp, flows

April Fools' Problem (hard)

binary search, data structures, flows

April Fools' Problem (medium)

binary search, flows, graphs

Heidi and Library (hard)

flows

Card Game

binary search, flows, graphs

Oleg and chess

data structures, divide and conquer, flows, graph matchings

ALT

data structures, flows, graphs, trees

Chess Championship

constructive algorithms, flows, greedy, math

Gosha is hunting

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

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

Petya and Graph

flows, graphs

Delivery Bears

binary search, flows, graphs

Bear and Fair Set

flows

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

Build String

flows, graphs

Planar Graph

flows, geometry, graphs

Privatization

flows, graphs

Machine Programming

flows, graphs

Bits of merry old England

flows, graphs

Pills

brute force, flows

Buying Sets

flows, graph matchings

Evacuation

flows, graphs, shortest paths

World Evil

dp, flows