AquaMoon and Potatoes

brute force, data structures, dp

Railway Construction

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

Egg Roulette

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

Math, math everywhere

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

Ruler Of The Zoo

brute force, data structures

Rogue-like Game

*special problem, brute force, greedy, two pointers

Plane of Tanks

brute force, geometry

Pills

brute force, flows

Keep talking and nobody explodes -- easy

bitmasks, brute force, expression parsing

Lucky Interval

brute force, math

Mateusz and an Infinite Sequence

bitmasks, brute force, dp, strings

Finding the Vertex

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

The very same Munchhausen

brute force

The Films

brute force

Optimal Encoding

brute force, data structures

Hex Dyslexia

bitmasks, brute force, dp, graphs

Just Kingdom

brute force, data structures, dfs and similar

Blocks and Sensors

brute force

To Hack or not to Hack

brute force, dp, greedy

Show Must Go On

binary search, brute force, greedy, shortest paths

Entertaining Geodetics

brute force, dsu, implementation

Marek and Matching (hard version)

brute force, probabilities

Low Budget Inception

brute force, geometry

Hellish Constraints

brute force, dp, two pointers

Ali goes shopping

*special problem, brute force, strings

Marek and Matching (easy version)

brute force, probabilities

Two Posters

brute force, data structures, greedy, two pointers

Mrs. Hudson's Pancakes

brute force, dp

Sequence Transformation

brute force, data structures, dp, implementation, math

Phoenix and Bits

bitmasks, brute force, data structures, sortings

Divide The Students

brute force

The Overdosing Ubiquity

brute force, dfs and similar, graphs

Tennis Rackets

brute force, geometry

Long sequence

brute force, math, matrices

Lift and Throw

brute force

Toys

brute force, combinatorics

Harry The Potter

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

Palindromic Hamiltonian Path

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

Inverse Inversions

binary search, brute force, data structures

Wavy numbers

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

Two Circles

brute force, data structures, implementation

Permutation Counting

brute force, combinatorics, dp, fft, math

The Tournament

brute force

Robot in Basement

bitmasks, brute force, implementation

Party

bitmasks, brute force, graph matchings

Tower Defense

binary search, brute force, data structures

Chests and Keys

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

Chiori and Doll Picking (hard version)

bitmasks, brute force, combinatorics, math

Prime Segment

*special problem, brute force

Take Metro

brute force, data structures, graphs

Supercollider

brute force

Gregor and the Odd Cows (Hard)

brute force, geometry, math, number theory

Minimum Diameter

binary search, brute force

Qingshan and Daniel

brute force, data structures, greedy, implementation

A Story of One Country (Hard)

brute force, greedy, sortings

Gears

brute force, geometry, math

A Creative Cutout

brute force, combinatorics, math

Frames

brute force

Bob's Beautiful Array

bitmasks, brute force, greedy

Chain Reaction

brute force, geometry

Bitonix' Patrol

bitmasks, brute force, combinatorics, dfs and similar, math

Power Defence

brute force, dp, geometry, greedy

Goblins And Gnomes

brute force, dp, flows, graph matchings

Domino

brute force, implementation

Nastya and CBS

brute force, data structures, hashing

Familiar Operations

brute force, graphs, math

Sweepstake

*special problem, brute force, constructive algorithms, implementation, math

Tree Calendar

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

Interactive Bulls and Cows (Hard)

brute force, constructive algorithms, interactive

Item World

brute force, implementation, sortings

Race

brute force, implementation

Invertation in Tournament

brute force, divide and conquer, graphs, math

Concise and clear

brute force, greedy, implementation, math

Physical Education and Buns

brute force, implementation, math

Banners

brute force, data structures, dp

Plane of Tanks: Duel

brute force, dp, math, probabilities

New Year and Binary Tree Paths

bitmasks, brute force, combinatorics, dp

Shaass and Painter Robot

brute force, implementation, number theory

Chainword

brute force, data structures, dp, matrices, string suffix structures, strings

Kingdom of Islands

brute force, graphs, implementation

Bear and Chase

brute force, dfs and similar, graphs, implementation, math, probabilities

Fibonacci Number

brute force, math, matrices

Sign Posts

brute force, geometry, math

Cycle

brute force, dfs and similar, implementation

Delete The Edges

brute force, constructive algorithms, dfs and similar, graphs, implementation

Cubeword

*special problem, brute force, dp, meet-in-the-middle

Delivery Oligopoly

brute force, dp, graphs

Synchrophasotron

brute force

Rectangles and Square

brute force, dp

Substring Search

bitmasks, brute force, fft

Savior

brute force, dsu, math

String Distance

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

Shortest path

brute force, geometry, math, shortest paths

Boolean Computer

bitmasks, brute force, fft, math

Roland and Rose

brute force, geometry, math, sortings

Digits

brute force, implementation, math

Party Organization

brute force, math, probabilities

Random Elections

bitmasks, brute force, divide and conquer, fft, math

RC Kaboom Show

binary search, brute force, data structures, geometry, math

Sources and Sinks

bitmasks, brute force, dfs and similar