Two Arrays

data structures, matrices

Cubic Lattice

geometry, math, matrices, number theory

Tasty Dishes

math, matrices

Red-Blue Graph

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

Parallel Universes (Hard)

math, matrices

DZY Loves Bridges

math, matrices

Flowers and Chocolate

combinatorics, math, matrices

Berland Traffic

math, matrices

Fibonacci Strings

matrices, strings

Long sequence

brute force, math, matrices

Star Trek

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

Combining Slimes

dp, math, matrices, probabilities

A Trance of Nightfall

dp, geometry, matrices, probabilities

Trails (Hard)

dp, matrices

Coloring Game

dp, games, matrices

1 2 3 4 ...

dp, math, matrices

Design Tutorial: Change the Goal

constructive algorithms, math, matrices

Piet's Palette

matrices

Asterism Stream

dp, math, matrices

Vasya and Shifts

matrices

Subsequences Return

dp, matrices

European Trip

dp, graphs, math, matrices

Long Binary String

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

Cross Xor

constructive algorithms, graphs, math, matrices

Mushroom Gnomes

math, matrices

Fibonacci Number

brute force, math, matrices

Flags

dp, math, matrices

Pentagon

combinatorics, graphs, matrices

Pollywog

combinatorics, dp, matrices

DZY Loves Games

math, matrices, probabilities

Trails (Medium)

dp, matrices

Strange Calculation and Cats

dp, matrices

Crime Management

dp, graphs, matrices

Chainword

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

Gambling Nim

bitmasks, math, matrices, probabilities

Perpetual Subtraction

fft, math, matrices

Stairs and Lines

dp, matrices

Permutations

math, matrices

Little Pony and Elements of Harmony

dp, matrices

Hamming Distance

constructive algorithms, greedy, math, matrices

Matrix Rank (Hard Version)

combinatorics, dp, math, matrices, string suffix structures

Neko Rules the Catniverse (Small Version)

bitmasks, dp, matrices

Fibonacci String Subsequences

combinatorics, dp, matrices

Mirror Box

matrices, trees

Jeff and Brackets

dp, matrices

Wizards and Bets

dfs and similar, graphs, math, matrices

Colored Cubes

constructive algorithms, implementation, matrices

LCC

data structures, math, matrices, probabilities

Bear in the Field

math, matrices

Yet Another Number Sequence

combinatorics, math, matrices

No Game No Life

bitmasks, games, math, matrices

Matrix Rank (Easy Version)

brute force, combinatorics, dp, math, matrices

Tricolor Triangles

brute force, graphs, math, matrices

Neko Rules the Catniverse (Large Version)

bitmasks, dp, matrices

Fancy Arrays

combinatorics, dp, math, matrices

Tree Weights

bitmasks, constructive algorithms, data structures, dfs and similar, implementation, math, matrices, number theory, trees

Minibuses on Venus (medium version)

combinatorics, divide and conquer, dp, matrices

Museum

math, matrices, probabilities

Mr. Kitayuta's Gift

combinatorics, dp, matrices, strings

Labyrinth Adventures

data structures, dp, matrices, shortest paths

Wine Factory (Hard Version)

data structures, dp, flows, greedy, matrices

Prefix Sums

binary search, brute force, combinatorics, math, matrices

Smile House

binary search, graphs, matrices

Strange Addition

data structures, dp, matrices

Fibonotci

data structures, math, matrices

Anniversary

data structures, implementation, math, matrices, number theory

Lust

combinatorics, math, matrices

Points

combinatorics, data structures, implementation, math, matrices

Lunar New Year and a Recursive Sequence

math, matrices, number theory

Runner's Problem

dp, matrices, sortings

Stranger Trees

dp, math, matrices, trees

Axel and Marston in Bitland

bitmasks, dp, graphs, matrices

Magic Matrix

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

Fenwick Tree

brute force, combinatorics, data structures, dp, math, matrices, trees

Fractal Origami

geometry, math, matrices

Sonya and Informatics

combinatorics, dp, matrices, probabilities

Latin Square

math, matrices

Legen...

data structures, dp, matrices, strings

Chain Chips

data structures, dp, matrices

Xum

bitmasks, constructive algorithms, math, matrices, number theory

Flights for Regular Customers

dp, matrices

Dexterina’s Lab

games, matrices, probabilities

Darth Vader and Tree

dp, matrices

Neural Network country

dp, matrices

Intersection and Union

data structures, dp, matrices, probabilities

Okabe and El Psy Kongroo

dp, matrices

New Year and Old Subsequence

data structures, divide and conquer, dp, matrices

Cross Swapping

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

Turtles

dp, matrices

(Zero XOR Subset)-less

math, matrices

GukiZ and Binary Operations

combinatorics, implementation, math, matrices, number theory

Make It Connected

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

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

Down or Right

constructive algorithms, interactive, matrices

Robots on a Grid

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

PLEASE

combinatorics, dp, implementation, math, matrices

Xor-sequences

matrices

Product Oriented Recurrence

dp, math, matrices, number theory