Gregor and the Pawn Game

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

Division by Two and Permutation

constructive algorithms, flows, graph matchings, greedy, math

Li Hua and Maze

constructive algorithms, flows, graphs, greedy, implementation

Qpwoeirut And The City

dp, flows, greedy, implementation

Engineer Artem

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

Chef Monocarp

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

Alyona and a Narrow Fridge

binary search, flows, greedy, sortings

Armchairs

dp, flows, graph matchings, greedy

Secret Santa

constructive algorithms, flows, graphs, greedy, math

Rock, Paper, Scissors

brute force, constructive algorithms, flows, greedy, math

Treasure Island

dfs and similar, dp, flows, hashing

Vasya And The Matrix

constructive algorithms, flows, math

Koxia and Game

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

Soldier and Traveling

flows, graphs, math

Array and Operations

flows, graph matchings, number theory

Single-use Stones

binary search, flows, greedy, two pointers

Ciel and Duel

dp, flows, greedy

Paired Payment

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

Segments Removal

data structures, dsu, flows, implementation, two pointers

Delivery Bears

binary search, flows, graphs

Fox And Dinner

flows

Little C Loves 3 II

brute force, constructive algorithms, flows, graph matchings

Gosha is hunting

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

One-Way Reform

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

Petya and Graph

flows, graphs

T-shirts Distribution

constructive algorithms, flows, greedy

Olympiad in Programming and Sports

dp, flows, graphs, greedy

Valuable Paper

binary search, flows, graph matchings, graphs

Yet Another Array Counting Problem

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

Flawed Flow

constructive algorithms, flows, graphs, greedy

Build String

flows, graphs

Maximize Mex

flows, graph matchings, graphs

Ann and Books

data structures, flows, hashing

Four Points

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

Grouped Carriages

binary search, data structures, dp, flows, greedy

Kirill and Company

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

Goods transportation

dp, flows, greedy

Binary Tree on Plane

flows, trees

Almost Permutation

flows

k-Maximum Subsequence Sum

data structures, flows, graphs, implementation

Bricks

flows, graph matchings, graphs

Card Game

binary search, flows, graphs

Biologist

flows

April Fools' Problem (medium)

binary search, flows, graphs

Summoning Minions

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

Two Melodies

dp, flows

Exploration plan

binary search, flows, graph matchings, shortest paths

Rectangle Painting 2

flows, graph matchings, graphs

Strange Set

flows, math

Machine Programming

flows, graphs

Double Sort II

dfs and similar, flows, graph matchings, graphs

Anti-Palindromize

flows, graphs, greedy

Economic Difficulties

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

Petya and Pipes

flows, graphs, shortest paths

Zoning Restrictions

dp, flows, graphs

Buying Sets

flows, graph matchings

Captain America

flows, greedy

April Fools' Problem (hard)

binary search, data structures, flows

Allowed Letters

bitmasks, flows, graph matchings, graphs, greedy

Vasya and Endless Credits

dp, flows, graph matchings, graphs, sortings

Bear and Fair Set

flows, graphs

Button Lock

flows, graph matchings, graphs

Beautiful League

constructive algorithms, flows, graph matchings

Incorrect Flow

flows

Pumping Stations

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

Access Levels

bitmasks, dsu, flows, graph matchings

Underfail

flows

Students Initiation

binary search, flows, graphs

Tidying Up

flows, graph matchings

Yet Another DAG Problem

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

Four Melodies

flows, graphs

ALT

data structures, flows, graphs, trees

Horseback Riding

flows, graphs

Road Construction

flows, graphs

Minimal k-covering

flows, graphs

Alice and Recoloring 2

constructive algorithms, flows, graph matchings, greedy

The Doctor Meets Vader (Medium)

flows, graph matchings, graphs, shortest paths, sortings

New Year and Forgotten Tree

constructive algorithms, flows, graphs

Euclid Guess

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

Tidying Up

flows

Privatization of Roads in Berland

flows, graph matchings, graphs

Heidi and Library (hard)

flows

Evacuation

flows, graphs, shortest paths

Multiset of Strings

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

Politics

flows, graphs

Madoka and The First Session

constructive algorithms, flows, graph matchings, graphs, implementation

Yet Another Maxflow Problem

data structures, flows, graphs

Gang Up

flows, graphs

Bits of merry old England

flows, graphs

Making It Bipartite

flows, graph matchings, graphs, number theory

Red-Blue Graph

constructive algorithms, flows

Bridge Club

flows, graph matchings, graphs, greedy

Cow and Exercise

flows, graphs, shortest paths

Dominoes

combinatorics, flows, graph matchings, greedy

Starry Night Camping

constructive algorithms, flows, graphs

Cactusophobia

dfs and similar, flows

Nanami's Power Plant

flows

Deciphering

flows, graph matchings

Fishermen

flows, graph matchings, greedy

Chests and Keys

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