Tasty Dishes

math, matrices

Cubic Lattice

geometry, math, matrices, number theory

Red-Blue Graph

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

Flowers and Chocolate

combinatorics, math, matrices

Combining Slimes

dp, math, matrices, probabilities

Two Arrays

data structures, matrices

Piet's Palette

matrices

Cross Xor

constructive algorithms, graphs, math, 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

1 2 3 4 ...

dp, math, matrices

Neko Rules the Catniverse (Large Version)

bitmasks, dp, matrices

Little Pony and Elements of Harmony

dp, matrices

Mr. Kitayuta's Gift

combinatorics, dp, matrices, strings

Lust

combinatorics, math, matrices

Long Binary String

bitmasks, math, matrices, meet-in-the-middle, number theory

Subsequences Return

dp, matrices

Fibonacci Number

brute force, math, matrices

Pollywog

combinatorics, dp, matrices

Wizards and Bets

dfs and similar, graphs, math, matrices

Tricolor Triangles

brute force, 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

Long sequence

brute force, math, matrices

Coloring Game

dp, games, matrices

A Trance of Nightfall

dp, geometry, matrices, probabilities

Design Tutorial: Change the Goal

constructive algorithms, math, matrices

Chainword

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

Stairs and Lines

dp, matrices

No Game No Life

bitmasks, games, math, matrices

Colored Cubes

constructive algorithms, implementation, matrices

Museum

math, matrices, probabilities

Fibonotci

data structures, math, matrices

Latin Square

math, matrices

Flights for Regular Customers

dp, matrices

Fibonacci Strings

matrices, strings

Star Trek

*special problem, combinatorics, dfs and similar, dp, games, graphs, matrices, trees

Vasya and Shifts

matrices

Mushroom Gnomes

math, matrices

Labyrinth Adventures

data structures, dp, matrices, shortest paths

Strange Addition

data structures, dp, 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

Legen...

data structures, dp, matrices, strings

Xum

bitmasks, constructive algorithms, math, matrices, number theory

Turtles

dp, matrices

Pentagon

combinatorics, graphs, matrices

Gambling Nim

bitmasks, math, matrices, probabilities

Strange Calculation and Cats

dp, matrices

Crime Management

dp, graphs, 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

Anniversary

data structures, implementation, math, matrices, number theory

Lunar New Year and a Recursive Sequence

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

William The Oblivious

bitmasks, data structures, dp, 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

Funny Substrings

data structures, hashing, implementation, matrices, strings

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

Decoding Genome

dp, matrices

Xor-sequences

matrices

Once Again...

constructive algorithms, dp, matrices

Chemical table

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

Infinite Set

bitmasks, dp, math, matrices, number theory, strings

Moamen and XOR

bitmasks, combinatorics, dp, math, matrices

Barcode

dp, matrices

Quiz

binary search, greedy, math, matrices, number theory

Add One

dp, matrices

Tetrahedron

dp, math, matrices

Factory

implementation, math, matrices

Weird Sum

combinatorics, data structures, geometry, math, matrices, sortings

Almost Ternary Matrix

bitmasks, constructive algorithms, matrices