Weird Sum

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

Factory

implementation, math, matrices

Tetrahedron

dp, math, matrices

Add One

dp, matrices

Quiz

binary search, greedy, math, matrices, number theory

Barcode

dp, matrices

Moamen and XOR

bitmasks, combinatorics, dp, math, matrices

Infinite Set

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

Chemical table

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

Once Again...

constructive algorithms, dp, matrices

Xor-sequences

matrices

Decoding Genome

dp, matrices

Dexterina’s Lab

games, matrices, probabilities

Wet Shark and Blocks

dp, matrices

PLEASE

combinatorics, dp, implementation, math, matrices

Neural Network country

dp, matrices

Height All the Same

combinatorics, constructive algorithms, math, matrices

Magic Gems

dp, math, matrices

Funny Substrings

data structures, hashing, implementation, matrices, strings

Down or Right

constructive algorithms, interactive, matrices

GukiZ and Binary Operations

combinatorics, implementation, math, matrices, number theory

Addition Robot

data structures, math, matrices

Okabe and El Psy Kongroo

dp, matrices

Runner's Problem

dp, matrices, sortings

Robots on a Grid

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

Darth Vader and Tree

dp, matrices

Count Pairs

math, matrices, number theory, two pointers

Sasha and Array

data structures, math, matrices

Product Oriented Recurrence

dp, math, matrices, number theory

(Zero XOR Subset)-less

math, matrices

Sonya and Informatics

combinatorics, dp, matrices, probabilities

Bear in the Field

math, matrices

William The Oblivious

bitmasks, data structures, dp, matrices

Mahmoud and Ehab and yet another xor task

bitmasks, dp, math, matrices

Axel and Marston in Bitland

bitmasks, dp, graphs, matrices

Lunar New Year and a Recursive Sequence

math, matrices, number theory

Anniversary

data structures, implementation, math, matrices, number theory

Magic Matrix

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

Prefix Sums

binary search, brute force, combinatorics, math, matrices

Hamming Distance

constructive algorithms, greedy, math, matrices

Fibonacci String Subsequences

combinatorics, dp, matrices

Crime Management

dp, graphs, matrices

Strange Calculation and Cats

dp, matrices

Gambling Nim

bitmasks, math, matrices, probabilities

Pentagon

combinatorics, graphs, matrices

Turtles

dp, matrices

Xum

bitmasks, constructive algorithms, math, matrices, number theory

Legen...

data structures, dp, matrices, strings

Smile House

binary search, graphs, matrices

Jeff and Brackets

dp, matrices

Flags

dp, math, matrices

New Year and Old Subsequence

data structures, divide and conquer, dp, matrices

Stranger Trees

dp, math, matrices, trees

Strange Addition

data structures, dp, matrices

Mushroom Gnomes

math, matrices

Vasya and Shifts

matrices

Star Trek

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

Fibonacci Strings

matrices, strings

Flights for Regular Customers

dp, matrices

Latin Square

math, matrices

Fibonotci

data structures, math, matrices

Museum

math, matrices, probabilities

Colored Cubes

constructive algorithms, implementation, matrices

No Game No Life

bitmasks, games, math, matrices

Stairs and Lines

dp, matrices

Chainword

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

Design Tutorial: Change the Goal

constructive algorithms, math, matrices

A Trance of Nightfall

dp, geometry, matrices, probabilities

Coloring Game

dp, games, matrices

Long sequence

brute force, math, matrices

Berland Traffic

math, matrices

Permutations

math, matrices

DZY Loves Games

math, matrices, probabilities

Neko Rules the Catniverse (Small Version)

bitmasks, dp, matrices

Tricolor Triangles

brute force, graphs, math, matrices

Wizards and Bets

dfs and similar, graphs, math, matrices

Pollywog

combinatorics, dp, matrices

Fibonacci Number

brute force, math, matrices

Subsequences Return

dp, matrices

Lust

combinatorics, math, matrices

Mr. Kitayuta's Gift

combinatorics, dp, matrices, strings

Little Pony and Elements of Harmony

dp, matrices

Neko Rules the Catniverse (Large Version)

bitmasks, dp, matrices

1 2 3 4 ...

dp, math, matrices

LCC

data structures, math, matrices, probabilities

Perpetual Subtraction

fft, math, matrices

DZY Loves Bridges

math, matrices

Parallel Universes (Hard)

math, matrices

Mirror Box

matrices, trees

Piet's Palette

matrices

Cross Xor

constructive algorithms, graphs, math, matrices

Two Arrays

data structures, matrices

Combining Slimes

dp, math, matrices, probabilities

Flowers and Chocolate

combinatorics, math, matrices

Red-Blue Graph

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

Cubic Lattice

geometry, math, matrices, number theory

Tasty Dishes

math, matrices