Red-Blue Graph

dp, graphs, math, matrices, meet-in-the-middle

Flowers and Chocolate

combinatorics, math, matrices

Combining Slimes

dp, math, matrices, probabilities

Piet's Palette

matrices

Mirror Box

matrices, trees

Parallel Universes (Hard)

math, matrices

DZY Loves Bridges

math, matrices

Perpetual Subtraction

fft, math, matrices

LCC

data structures, math, matrices, probabilities

Neko Rules the Catniverse (Large Version)

bitmasks, dp, matrices

Little Pony and Elements of Harmony

dp, matrices

Lust

combinatorics, math, matrices

Mr. Kitayuta's Gift

combinatorics, dp, matrices, strings

Subsequences Return

dp, matrices

Pollywog

combinatorics, dp, matrices

Fibonacci Number

brute force, math, matrices

Wizards and Bets

dfs and similar, graphs, math, matrices

Neko Rules the Catniverse (Small Version)

bitmasks, dp, matrices

DZY Loves Games

math, matrices, probabilities

Permutations

math, matrices

Berland Traffic

math, matrices

Coloring Game

dp, games, matrices

Long sequence

brute force, math, matrices

A Trance of Nightfall

dp, geometry, matrices, probabilities

Design Tutorial: Change the Goal

constructive algorithms, math, matrices

Stairs and Lines

dp, matrices

Museum

math, matrices, probabilities

Fibonotci

data structures, math, matrices

Colored Cubes

constructive algorithms, implementation, matrices

Flights for Regular Customers

dp, matrices

Fibonacci Strings

matrices, strings

Vasya and Shifts

matrices

Mushroom Gnomes

math, matrices

Stranger Trees

dp, math, matrices, trees

New Year and Old Subsequence

data structures, divide and conquer, dp, matrices

Flags

dp, math, matrices

Jeff and Brackets

dp, matrices

Smile House

binary search, graphs, matrices

Turtles

dp, matrices

Legen...

data structures, dp, matrices, strings

Gambling Nim

bitmasks, math, matrices, probabilities

Pentagon

combinatorics, graphs, matrices

Crime Management

dp, graphs, matrices

Strange Calculation and Cats

dp, matrices

Fibonacci String Subsequences

combinatorics, dp, matrices

Hamming Distance

constructive algorithms, greedy, math, matrices

Prefix Sums

binary search, brute force, combinatorics, math, matrices

Magic Matrix

brute force, divide and conquer, graphs, matrices, trees

Lunar New Year and a Recursive Sequence

math, matrices, number theory

Anniversary

data structures, implementation, math, matrices, number theory

Axel and Marston in Bitland

bitmasks, dp, graphs, matrices

Mahmoud and Ehab and yet another xor task

bitmasks, dp, math, matrices

Bear in the Field

math, matrices

Sonya and Informatics

combinatorics, dp, matrices, probabilities

(Zero XOR Subset)-less

math, matrices

Product Oriented Recurrence

dp, math, matrices, number theory

Sasha and Array

data structures, math, matrices

Count Pairs

math, matrices, number theory, two pointers

Darth Vader and Tree

dp, matrices

Robots on a Grid

data structures, dfs and similar, dsu, graphs, greedy, matrices

Runner's Problem

dp, matrices, sortings

Okabe and El Psy Kongroo

dp, matrices

Addition Robot

data structures, math, matrices

GukiZ and Binary Operations

combinatorics, implementation, math, matrices, number theory

Down or Right

constructive algorithms, interactive, matrices

Magic Gems

dp, math, matrices

Height All the Same

combinatorics, constructive algorithms, math, matrices

Neural Network country

dp, matrices

PLEASE

combinatorics, dp, implementation, math, matrices

Wet Shark and Blocks

dp, matrices

Dexterina’s Lab

games, matrices, probabilities

Xor-sequences

matrices

Decoding Genome

dp, matrices

Chemical table

constructive algorithms, dfs and similar, dsu, graphs, matrices

Once Again...

constructive algorithms, dp, matrices

Barcode

dp, matrices

Quiz

binary search, greedy, math, matrices, number theory

Tetrahedron

dp, math, matrices

Factory

implementation, math, matrices