Buy One, Get One Free

dp, greedy

Birthday

constructive algorithms, greedy, math

The Majestic Brown Tree Snake

dfs and similar, dp, greedy, trees, two pointers

Bear and Rectangle Strips

dp, greedy

Down Below

binary search, dfs and similar, graphs, greedy, meet-in-the-middle, shortest paths

Candies Game

constructive algorithms, greedy

Game Bundles

brute force, constructive algorithms, dp, greedy, math

Berland Miners

binary search, data structures, dfs and similar, greedy, trees

A Stroll Around the Matrix

data structures, greedy, math

Parmigiana With Seafood

binary search, dp, greedy, trees

World of Tank

dp, greedy

The Thorny Path

greedy, math

A Story of One Country (Hard)

brute force, greedy, sortings

Flower-like Pseudotree

constructive algorithms, graphs, greedy, implementation, trees

Wizards and Roads

data structures, divide and conquer, graph matchings, graphs, greedy

PermutationForces

data structures, greedy

Card Pairing

dp, greedy, hashing, implementation

To Play or not to Play

greedy

Flip and Reverse

data structures, graphs, greedy

Captain America

flows, greedy

To Make 1

bitmasks, constructive algorithms, dp, greedy, number theory

Raffles

data structures, dp, greedy, math

AB Tree

dp, greedy, trees

Huffman Coding on Segment

data structures, greedy

Squid Game

data structures, dfs and similar, greedy, trees

Bitwise Paradox

binary search, bitmasks, data structures, greedy, two pointers

Fishermen

flows, graph matchings, greedy

Madoka and Laziness

dp, greedy

Computer Game

dp, greedy, math, probabilities

Survival of the Weakest (hard version)

greedy, math, sortings, two pointers

Four Vertices

constructive algorithms, data structures, graphs, greedy, implementation, shortest paths

Secret Letters

data structures, dp, greedy

Tokitsukaze and Explosion

binary search, greedy

Two Characters, Two Colors

binary search, data structures, dp, flows, greedy

To Hack or not to Hack

brute force, dp, greedy

Show Must Go On

binary search, brute force, greedy, shortest paths

Division Avoidance

greedy, math

Bear and Bowling

data structures, greedy

Summer Dichotomy

2-sat, data structures, dfs and similar, greedy

Clockwork Bomb

data structures, dfs and similar, dsu, greedy, trees

Qingshan and Daniel

brute force, data structures, greedy, implementation

Boring Card Game

data structures, greedy, trees

Split

binary search, data structures, dp, greedy

Thanos Snap

binary search, dp, games, greedy, trees

Two Posters

brute force, data structures, greedy, two pointers

Four Suits

binary search, bitmasks, flows, greedy

JS Minification

greedy, implementation

An easy problem about trees

dp, games, greedy, trees

Growing Trees

binary search, constructive algorithms, flows, graphs, greedy

Spiders Evil Plan

greedy, trees

Organizing a Race

data structures, greedy

AmShZ Wins a Bet

data structures, greedy, hashing

Showing Off

flows, graph matchings, greedy, implementation

Rainbow Triples

binary search, data structures, flows, greedy

Breadboard Capacity (easy version)

dp, flows, greedy

DIY Tree

graphs, greedy, math, probabilities

N Machines

binary search, brute force, greedy

Permutation for Burenka

data structures, graph matchings, greedy, math, trees

A Certain Magical Party

combinatorics, data structures, greedy, sortings

Finding satisfactory solutions

combinatorics, dp, graphs, greedy, math

New Road Network

constructive algorithms, greedy, math

MEX Game 2 (Hard Version)

binary search, greedy, two pointers

Dreamoon Loves AA

binary search, greedy

Diamond Theft

data structures, greedy

Moving Walkways

data structures, greedy, math

Tanya is 5!

graph matchings, graphs, greedy, schedules

Nezzar and Tournaments

data structures, greedy

Egor and an RPG game

constructive algorithms, greedy

Outermost Maximums

data structures, greedy

Bus Routes

binary search, constructive algorithms, dfs and similar, greedy, trees

Gregor and the Two Painters

data structures, divide and conquer, graphs, greedy, math

I Might Be Wrong

binary search, greedy, two pointers

Half-sum

brute force, divide and conquer, greedy

Rivalries

constructive algorithms, data structures, greedy

Rin and The Unknown Flower

constructive algorithms, greedy, interactive, math

Minimize Inversions Number

data structures, greedy, math, sortings

XOR-ranges

dp, greedy

Become Big For Me

combinatorics, constructive algorithms, greedy, math, number theory

Maximum Product?

brute force, combinatorics, dp, greedy, implementation, math, two pointers

The Ultimate LIS Problem

data structures, greedy

Balanced Distribution

data structures, dp, greedy

Clubstep

binary search, brute force, data structures, greedy, trees

Kuroni the Private Tutor

binary search, greedy

Tenzing and Necklace

divide and conquer, dp, greedy

Copium Permutation

constructive algorithms, data structures, greedy

Permutation Weight (Hard Version)

constructive algorithms, greedy

Slime and Hats

constructive algorithms, dp, greedy

Future Dominators

graphs, greedy

Standard Graph Problem

data structures, graphs, greedy, trees

Min-Sum-Max

constructive algorithms, dp, greedy

LIS?

data structures, greedy, implementation

Doremy's Average Tree

data structures, dp, greedy, trees