Petya and Pipes

flows, graphs, shortest paths

The Most Reckless Defense

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

Biologist

flows

Ann and Books

data structures, flows, hashing

Yet Another Array Counting Problem

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

Fox And Dinner

flows

The Doctor Meets Vader (Medium)

flows, graph matchings, graphs, shortest paths, sortings

Tidying Up

flows

Almost Permutation

flows

Kirill and Company

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

One-Way Reform

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

Little C Loves 3 II

brute force, constructive algorithms, flows, graph matchings

Delivery Bears

binary search, flows, graphs

Paired Payment

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

Exploration plan

binary search, flows, graph matchings, shortest paths

Grouped Carriages

binary search, data structures, dp, flows, greedy

Flawed Flow

constructive algorithms, flows, graphs, greedy

Array and Operations

flows, graph matchings, number theory

Soldier and Traveling

flows, graphs, math

Build String

flows, graphs

Olympiad in Programming and Sports

dp, flows, graphs, greedy

Segments Removal

data structures, dsu, flows, implementation, two pointers

Koxia and Game

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

Engineer Artem

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

Valuable Paper

binary search, flows, graph matchings, graphs

Vlad and Trouble at MIT

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

Ciel and Duel

dp, flows, greedy

Single-use Stones

binary search, flows, greedy, two pointers

Treasure Island

dfs and similar, dp, flows, hashing

T-shirts Distribution

constructive algorithms, flows, greedy

Vasya And The Matrix

constructive algorithms, flows, math

Rock, Paper, Scissors

brute force, constructive algorithms, flows, greedy, math

Armchairs

dp, flows, graph matchings, greedy

Chef Monocarp

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

Secret Santa

constructive algorithms, flows, graphs, greedy, math

Qpwoeirut And The City

dp, flows, greedy, implementation

Alyona and a Narrow Fridge

binary search, flows, greedy, sortings

Division by Two and Permutation

constructive algorithms, flows, graph matchings, greedy, math

Li Hua and Maze

constructive algorithms, flows, graphs, greedy, implementation

Gregor and the Pawn Game

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