Cubic Lattice

geometry, math, matrices, number theory

Tasty Dishes

math, matrices

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

Asterism Stream

dp, math, 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

Little Pony and Elements of Harmony

dp, matrices

Neko Rules the Catniverse (Large Version)

bitmasks, dp, matrices

Tree Weights

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

Mr. Kitayuta's Gift

combinatorics, dp, matrices, strings

Lust

combinatorics, math, matrices

Subsequences Return

dp, matrices

Long Binary String

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

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

DZY Loves Games

math, matrices, probabilities

Permutations

math, matrices

Neko Rules the Catniverse (Small Version)

bitmasks, dp, matrices

Wine Factory (Hard Version)

data structures, dp, flows, greedy, matrices

Berland Traffic

math, matrices

Long sequence

brute force, math, matrices

A Trance of Nightfall

dp, geometry, matrices, probabilities

Coloring Game

dp, games, matrices

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

Matrix Rank (Hard Version)

combinatorics, dp, math, matrices, string suffix structures

Colored Cubes

constructive algorithms, implementation, matrices

No Game No Life

bitmasks, games, math, matrices

Matrix Rank (Easy Version)

brute force, combinatorics, dp, math, 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

Fancy Arrays

combinatorics, dp, 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

Minibuses on Venus (medium version)

combinatorics, divide and conquer, dp, matrices

Smile House

binary search, graphs, matrices

Points

combinatorics, data structures, implementation, math, matrices

Legen...

data structures, dp, matrices, strings

Xum

bitmasks, constructive algorithms, math, matrices, number theory

Turtles

dp, matrices

Pentagon

combinatorics, graphs, matrices

Strange Calculation and Cats

dp, matrices

Crime Management

dp, graphs, matrices

Gambling Nim

bitmasks, math, matrices, probabilities

Hamming Distance

constructive algorithms, greedy, math, matrices

Fibonacci String Subsequences

combinatorics, dp, matrices

Prefix Sums

binary search, brute force, combinatorics, math, matrices

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

Magic Matrix

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

Fractal Origami

geometry, math, matrices

Cross Swapping

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

Make It Connected

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

William The Oblivious

bitmasks, data structures, dp, matrices

Mahmoud and Ehab and yet another xor task

bitmasks, dp, math, matrices

Bear in the Field

math, matrices

Sonya and Informatics

combinatorics, dp, matrices, probabilities

Chain Chips

data structures, dp, matrices

Intersection and Union

data structures, 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

Trails (Hard)

dp, matrices

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

GukiZ and Binary Operations

combinatorics, implementation, math, matrices, number theory

Addition Robot

data structures, math, matrices

Down or Right

constructive algorithms, interactive, matrices

Funny Substrings

data structures, hashing, implementation, matrices, strings

Height All the Same

combinatorics, constructive algorithms, math, matrices

Magic Gems

dp, math, matrices

Trails (Medium)

dp, matrices

Neural Network country

dp, matrices

PLEASE

combinatorics, dp, implementation, math, matrices