Gregor and the Pawn Game

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

Li Hua and Maze

constructive algorithms, flows, graphs, greedy, implementation

Division by Two and Permutation

constructive algorithms, flows, graph matchings, greedy, math

Alyona and a Narrow Fridge

binary search, flows, greedy, sortings

Qpwoeirut And The City

dp, flows, greedy, implementation

Secret Santa

constructive algorithms, flows, graphs, greedy, math

Chef Monocarp

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

Armchairs

dp, flows, graph matchings, greedy

Rock, Paper, Scissors

brute force, constructive algorithms, flows, greedy, math

Vasya And The Matrix

constructive algorithms, flows, math

T-shirts Distribution

constructive algorithms, flows, greedy

Treasure Island

dfs and similar, dp, flows, hashing

Single-use Stones

binary search, flows, greedy, two pointers

Vlad and Trouble at MIT

dfs and similar, dp, flows, graphs, greedy, implementation, trees

Ciel and Duel

dp, flows, greedy

Valuable Paper

binary search, flows, graph matchings, graphs

Engineer Artem

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

Koxia and Game

constructive algorithms, data structures, dfs and similar, dsu, flows, games, graph matchings, graphs, implementation

Segments Removal

data structures, dsu, flows, implementation, two pointers

Olympiad in Programming and Sports

dp, flows, graphs, greedy

Build String

flows, graphs

Soldier and Traveling

flows, graphs, math

Array and Operations

flows, graph matchings, number theory

Flawed Flow

constructive algorithms, flows, graphs, greedy

Grouped Carriages

binary search, data structures, dp, flows, greedy

Exploration plan

binary search, flows, graph matchings, shortest paths

Paired Payment

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

Delivery Bears

binary search, flows, graphs

Little C Loves 3 II

brute force, constructive algorithms, flows, graph matchings

One-Way Reform

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

Kirill and Company

bitmasks, brute force, dfs and similar, dp, flows, graphs, shortest paths

Almost Permutation

flows

The Doctor Meets Vader (Medium)

flows, graph matchings, graphs, shortest paths, sortings

Tidying Up

flows

Fox And Dinner

flows

Yet Another Array Counting Problem

binary search, data structures, divide and conquer, dp, flows, math, trees

Ann and Books

data structures, flows, hashing

Biologist

flows

The Most Reckless Defense

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

Petya and Pipes

flows, graphs, shortest paths

Tidying Up

flows, graph matchings

Horseback Riding

flows, graphs

Road Construction

flows, graphs

Evacuation

flows, graphs, shortest paths

Deciphering

flows, graph matchings

Petya and Graph

flows, graphs

Maximize Mex

flows, graph matchings, graphs

Four Points

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

Binary Tree on Plane

flows, trees

April Fools' Problem (medium)

binary search, flows, graphs

Card Game

binary search, flows, graphs

Matrix Problem

flows, graphs

Machine Programming

flows, graphs

Economic Difficulties

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

Allowed Letters

bitmasks, flows, graph matchings, graphs, greedy

Access Levels

bitmasks, dsu, flows, graph matchings

Underfail

flows

Students Initiation

binary search, flows, graphs

Privatization of Roads in Berland

flows, graph matchings, graphs

Cactusophobia

dfs and similar, flows

Rectangle Painting 2

flows, graph matchings, graphs

Summoning Minions

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

Double Sort II

dfs and similar, flows, graph matchings, graphs

Anti-Palindromize

flows, graphs, greedy

Bear and Fair Set

flows, graphs

Minimal k-covering

flows, graphs

Multiset of Strings

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

Madoka and The First Session

constructive algorithms, flows, graph matchings, graphs, implementation

Gang Up

flows, graphs

Last chance

data structures, flows, graph matchings, graphs, trees

Two Melodies

dp, flows

Vasya and Endless Credits

dp, flows, graph matchings, graphs, sortings

Button Lock

flows, graph matchings, graphs

Yet Another DAG Problem

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

Four Melodies

flows, graphs

Heidi and Library (hard)

flows

Politics

flows, graphs

Dominoes

combinatorics, flows, graph matchings, greedy

Strange Set

flows, math

Zoning Restrictions

dp, flows, graphs

Beautiful League

constructive algorithms, flows, graph matchings

Bits of merry old England

flows, graphs

Yet Another Maxflow Problem

data structures, flows, graphs

Electric Scheme

flows, graph matchings

Scaygerboss

flows

MCMF?

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

World Evil

dp, flows

The Doctor Meets Vader (Hard)

flows, shortest paths

k-Maximum Subsequence Sum

data structures, flows, graphs, implementation

Bricks

flows, graph matchings, graphs

Wine Factory (Hard Version)

data structures, dp, flows, greedy, matrices

Alice and Recoloring 2

constructive algorithms, flows, graph matchings, greedy

Euclid Guess

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

Bridge Club

flows, graph matchings, graphs, greedy

Matching Reduction

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

Goblins And Gnomes

brute force, dp, flows, graph matchings

Scaygerboss

flows

MCF

flows

Goods transportation

dp, flows, greedy

April Fools' Problem (hard)

binary search, data structures, flows