Almost Ternary Matrix

bitmasks, constructive algorithms, matrices

Tetrahedron

dp, math, matrices

Add One

dp, matrices

Weird Sum

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

Barcode

dp, matrices

Factory

implementation, math, 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

Magic Gems

dp, math, matrices

Chemical table

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

Height All the Same

combinatorics, constructive algorithms, math, matrices

Once Again...

constructive algorithms, dp, matrices

Sasha and Array

data structures, math, matrices

Funny Substrings

data structures, hashing, implementation, matrices, strings

Wet Shark and Blocks

dp, matrices

Product Oriented Recurrence

dp, math, matrices, number theory

Decoding Genome

dp, matrices

Xor-sequences

matrices

PLEASE

combinatorics, dp, implementation, math, matrices

Robots on a Grid

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

Down or Right

constructive algorithms, interactive, matrices

William The Oblivious

bitmasks, data structures, dp, matrices

GukiZ and Binary Operations

combinatorics, implementation, math, matrices, number theory

Addition Robot

data structures, math, matrices

Mahmoud and Ehab and yet another xor task

bitmasks, dp, math, matrices

Make It Connected

binary search, brute force, constructive algorithms, dsu, graphs, greedy, matrices, trees, two pointers

(Zero XOR Subset)-less

math, matrices

Cross Swapping

2-sat, data structures, dsu, greedy, matrices

New Year and Old Subsequence

data structures, divide and conquer, dp, matrices

Okabe and El Psy Kongroo

dp, matrices

Turtles

dp, matrices

Dexterina’s Lab

games, matrices, probabilities

Intersection and Union

data structures, dp, matrices, probabilities

Darth Vader and Tree

dp, matrices

Neural Network country

dp, matrices

Xum

bitmasks, constructive algorithms, math, matrices, number theory

Flights for Regular Customers

dp, matrices

Legen...

data structures, dp, matrices, strings

Latin Square

math, matrices

Sonya and Informatics

combinatorics, dp, matrices, probabilities

Axel and Marston in Bitland

bitmasks, dp, graphs, matrices

Chain Chips

data structures, dp, matrices

Runner's Problem

dp, matrices, sortings

Lunar New Year and a Recursive Sequence

math, matrices, number theory

Magic Matrix

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

Stranger Trees

dp, math, matrices, trees

Points

combinatorics, data structures, implementation, math, matrices

Anniversary

data structures, implementation, math, matrices, number theory

Lust

combinatorics, math, matrices

Smile House

binary search, graphs, matrices

Prefix Sums

binary search, brute force, combinatorics, math, matrices

Strange Addition

data structures, dp, matrices

Fibonotci

data structures, math, matrices

Mr. Kitayuta's Gift

combinatorics, dp, matrices, strings

Labyrinth Adventures

data structures, dp, matrices, shortest paths

Museum

math, matrices, probabilities

Bear in the Field

math, matrices

Yet Another Number Sequence

combinatorics, math, matrices

Jeff and Brackets

dp, matrices

No Game No Life

bitmasks, games, math, matrices

Tricolor Triangles

brute force, graphs, math, matrices

Colored Cubes

constructive algorithms, implementation, matrices

Fibonacci String Subsequences

combinatorics, dp, matrices

LCC

data structures, math, matrices, probabilities

Hamming Distance

constructive algorithms, greedy, math, matrices

Wizards and Bets

dfs and similar, graphs, math, matrices

Neko Rules the Catniverse (Large Version)

bitmasks, dp, matrices

Minibuses on Venus (medium version)

combinatorics, divide and conquer, dp, matrices

Little Pony and Elements of Harmony

dp, matrices

Mirror Box

matrices, trees

Neko Rules the Catniverse (Small Version)

bitmasks, dp, matrices

Permutations

math, matrices

Perpetual Subtraction

fft, math, matrices

Stairs and Lines

dp, matrices

Strange Calculation and Cats

dp, matrices

Crime Management

dp, graphs, matrices

Gambling Nim

bitmasks, math, matrices, probabilities

Pentagon

combinatorics, graphs, matrices

Chainword

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

Pollywog

combinatorics, dp, matrices

Flags

dp, math, matrices

DZY Loves Games

math, matrices, probabilities

Fibonacci Number

brute force, math, matrices

Mushroom Gnomes

math, matrices

Long Binary String

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

Vasya and Shifts

matrices

Subsequences Return

dp, matrices

Design Tutorial: Change the Goal

constructive algorithms, math, matrices

Cross Xor

constructive algorithms, graphs, math, matrices

European Trip

dp, graphs, math, matrices

A Trance of Nightfall

dp, geometry, matrices, probabilities

Coloring Game

dp, games, matrices

Combining Slimes

dp, math, matrices, probabilities

Piet's Palette

matrices

Star Trek

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

1 2 3 4 ...

dp, math, matrices

Long sequence

brute force, math, matrices

Berland Traffic

math, matrices