Tetrahedron

dp, math, matrices

Add One

dp, matrices

Weird Sum

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

Factory

implementation, math, matrices

Barcode

dp, matrices

Moamen and XOR

bitmasks, combinatorics, dp, math, matrices

Infinite Set

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

Quiz

binary search, greedy, math, matrices, number theory

Count Pairs

math, matrices, number theory, two pointers

Chemical table

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

Height All the Same

combinatorics, constructive algorithms, math, matrices

Magic Gems

dp, math, matrices

Once Again...

constructive algorithms, dp, matrices

Funny Substrings

data structures, hashing, implementation, matrices, strings

Sasha and Array

data structures, math, matrices

Wet Shark and Blocks

dp, matrices

Product Oriented Recurrence

dp, math, matrices, number theory

PLEASE

combinatorics, dp, implementation, math, matrices

Xor-sequences

matrices

Decoding Genome

dp, matrices

Robots on a Grid

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

Down or Right

constructive algorithms, interactive, matrices

GukiZ and Binary Operations

combinatorics, implementation, math, matrices, number theory

Addition Robot

data structures, math, matrices

William The Oblivious

bitmasks, data structures, dp, matrices

Mahmoud and Ehab and yet another xor task

bitmasks, dp, math, matrices

Okabe and El Psy Kongroo

dp, matrices

Dexterina’s Lab

games, matrices, probabilities

(Zero XOR Subset)-less

math, matrices

Darth Vader and Tree

dp, matrices

New Year and Old Subsequence

data structures, divide and conquer, dp, matrices

Neural Network country

dp, matrices

Turtles

dp, matrices

Xum

bitmasks, constructive algorithms, math, matrices, number theory

Flights for Regular Customers

dp, matrices

Axel and Marston in Bitland

bitmasks, dp, graphs, matrices

Legen...

data structures, dp, matrices, strings

Latin Square

math, matrices

Sonya and Informatics

combinatorics, dp, matrices, probabilities

Runner's Problem

dp, matrices, sortings

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

Stranger Trees

dp, math, matrices, trees

Smile House

binary search, graphs, matrices

Lust

combinatorics, math, matrices

Strange Addition

data structures, dp, matrices

Prefix Sums

binary search, brute force, combinatorics, math, matrices

Fibonotci

data structures, math, matrices

Bear in the Field

math, matrices

Jeff and Brackets

dp, matrices

Museum

math, matrices, probabilities

Mr. Kitayuta's Gift

combinatorics, dp, matrices, strings

Colored Cubes

constructive algorithms, implementation, matrices

Yet Another Number Sequence

combinatorics, math, matrices

Hamming Distance

constructive algorithms, greedy, math, matrices

No Game No Life

bitmasks, games, math, matrices

Tricolor Triangles

brute force, graphs, math, matrices

Fibonacci String Subsequences

combinatorics, dp, matrices

LCC

data structures, math, matrices, probabilities

Wizards and Bets

dfs and similar, graphs, math, matrices

Little Pony and Elements of Harmony

dp, matrices

Permutations

math, matrices

Stairs and Lines

dp, matrices

Mirror Box

matrices, trees

Crime Management

dp, graphs, matrices

Strange Calculation and Cats

dp, matrices

Gambling Nim

bitmasks, math, matrices, probabilities

Perpetual Subtraction

fft, math, matrices

Flags

dp, math, matrices

Pollywog

combinatorics, dp, matrices

Pentagon

combinatorics, graphs, matrices

DZY Loves Games

math, matrices, probabilities

Fibonacci Number

brute force, math, matrices

Neko Rules the Catniverse (Large Version)

bitmasks, dp, matrices

Mushroom Gnomes

math, matrices

Chainword

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

Neko Rules the Catniverse (Small Version)

bitmasks, dp, matrices

Subsequences Return

dp, matrices

Design Tutorial: Change the Goal

constructive algorithms, math, matrices

A Trance of Nightfall

dp, geometry, matrices, probabilities

Vasya and Shifts

matrices

Coloring Game

dp, games, matrices

Star Trek

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

Combining Slimes

dp, math, matrices, probabilities

Piet's Palette

matrices

Long sequence

brute force, math, matrices

Cross Xor

constructive algorithms, graphs, math, matrices

European Trip

dp, graphs, math, matrices

1 2 3 4 ...

dp, math, matrices

Berland Traffic

math, matrices

Fibonacci Strings

matrices, strings

Flowers and Chocolate

combinatorics, math, matrices

DZY Loves Bridges

math, matrices

Cubic Lattice

geometry, math, matrices, number theory

Red-Blue Graph

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

Tasty Dishes

math, matrices

Parallel Universes (Hard)

math, matrices

Two Arrays

data structures, matrices