Gears

brute force, geometry, math

Wavy numbers

brute force, dfs and similar, meet-in-the-middle, sortings

Strange Triples

brute force, math, number theory

Hellish Constraints

brute force, dp, two pointers

Damage per Second

brute force, math

Pills

brute force, flows

Plane of Tanks

brute force, geometry

Gosha is hunting

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

Substrings in a String

bitmasks, brute force, data structures, string suffix structures, strings

Make It Ascending

bitmasks, brute force, dp

Abandoning Roads

brute force, dp, graphs, greedy

Game of Stacks

brute force, dfs and similar, graphs, implementation, trees

A Serious Referee

bitmasks, brute force, dfs and similar, sortings

String Distance

binary search, brute force, data structures, hashing, implementation, strings

Colorful Tree Again

brute force, data structures, trees

Game Bundles

brute force, constructive algorithms, dp, greedy, math

Tower Defense

binary search, brute force, data structures

Banners

brute force, data structures, dp

Chain Reaction

brute force, geometry

A Story of One Country (Hard)

brute force, greedy, sortings

Palindromic Hamiltonian Path

brute force, dfs and similar, dp, graphs, hashing

Sequence Transformation

brute force, data structures, dp, implementation, math

Weird LCM Operations

brute force, constructive algorithms, number theory

Mrs. Hudson's Pancakes

brute force, dp

MST with Matching

bitmasks, brute force, dsu, graph matchings, trees

Tree Calendar

brute force, constructive algorithms, data structures, dfs and similar, sortings, trees

Infinite Game

brute force, combinatorics, dp, games, probabilities

Harry The Potter

brute force, constructive algorithms, dp, fft, implementation, math

Minimum Diameter

binary search, brute force

Just Kingdom

brute force, data structures, dfs and similar

Marek and Matching (easy version)

brute force, probabilities

Low Budget Inception

brute force, geometry

To Hack or not to Hack

brute force, dp, greedy

Show Must Go On

binary search, brute force, greedy, shortest paths

Invertation in Tournament

brute force, divide and conquer, graphs, math

New Year and Binary Tree Paths

bitmasks, brute force, combinatorics, dp

Qingshan and Daniel

brute force, data structures, greedy, implementation

Chests and Keys

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

Segment Covering

brute force, combinatorics, constructive algorithms, data structures, dp, trees

Inverse Inversions

binary search, brute force, data structures

Two Posters

brute force, data structures, greedy, two pointers

Marek and Matching (hard version)

brute force, probabilities

Math, math everywhere

brute force, dp, math, meet-in-the-middle, number theory

Next and Prev

brute force, data structures, implementation

Nastya and CBS

brute force, data structures, hashing

N Machines

binary search, brute force, greedy

Fishingprince Plays With Array Again

brute force, data structures, geometry, math

Gregor and the Odd Cows (Hard)

brute force, geometry, math, number theory

The Films

brute force

Hex Dyslexia

bitmasks, brute force, dp, graphs

Grove

brute force, dfs and similar, dp, geometry, probabilities

Egg Roulette

bitmasks, brute force, divide and conquer, math, meet-in-the-middle

Half-sum

brute force, divide and conquer, greedy

Mateusz and an Infinite Sequence

bitmasks, brute force, dp, strings

Cyclic Hamming (Easy Version)

brute force, divide and conquer, dp, fft, math, number theory

Railway Construction

brute force, constructive algorithms, data structures, graphs, shortest paths

Kuroni and Antihype

bitmasks, brute force, dp, dsu, graphs

Chiori and Doll Picking (hard version)

bitmasks, brute force, combinatorics, math

Phoenix and Bits

bitmasks, brute force, data structures, sortings

Minecraft Series

brute force, two pointers

Maximum Product?

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

Blocks and Sensors

brute force

Olympic Team Building

brute force, meet-in-the-middle

Finding the Vertex

brute force, dfs and similar, dp, interactive, trees

Clubstep

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

Optimal Encoding

brute force, data structures

Mark and Spaceship

brute force, dp

AquaMoon and Potatoes

brute force, data structures, dp

Cyclic Hamming (Hard Version)

brute force, dp, fft, math, number theory

Ruler Of The Zoo

brute force, data structures