LEGOndary Grandmaster

combinatorics, dp, math

Purple Crayon

data structures, dfs and similar, games, graphs, greedy, math, sortings, trees

Divan and a Cottage

binary search, data structures

Tree Coloring

combinatorics, divide and conquer, fft

Max Sum Array

combinatorics, constructive algorithms, greedy, sortings

Armor and Weapons

brute force, dp, greedy, shortest paths

Robot and Candies

data structures, graph matchings, greedy

Mashtali vs AtCoder

games, trees

Squid Game

data structures, dfs and similar, greedy, trees

AmShZ Wins a Bet

data structures, greedy, hashing

Mashtali: a Space Oddysey

constructive algorithms, dfs and similar, graphs

Pushing Robots

A Stroll Around the Matrix

data structures, greedy, math

Interesting Sections

data structures, divide and conquer, meet-in-the-middle, two pointers

William The Oblivious

bitmasks, data structures, dp, matrices

Alphabetic Tree

binary search, data structures, dfs and similar, hashing, string suffix structures, strings, trees

MEX counting

combinatorics, dp, implementation

The Cells on the Paper

binary search, implementation, sortings

Dominoes

combinatorics, fft, graphs, math, number theory

Tree Queries

brute force, dp, trees

Red-Blue Matrix

brute force, constructive algorithms, implementation, sortings

PalindORme

combinatorics, dp

Array Equalizer

binary search, greedy, implementation, math, number theory, sortings, two pointers

October 18, 2017

combinatorics, dp, implementation, math

A Perfect Problem

combinatorics, dp, math

Artistic Partition

divide and conquer, dp, number theory

Two Sorts

binary search, dfs and similar, math, meet-in-the-middle

Phys Ed Online

data structures, dp, greedy

Difficult Mountain

data structures, dp, greedy, sortings

Bob's Beautiful Array

bitmasks, brute force, greedy

Desert

data structures, graphs

Shortest path

brute force, geometry, math, shortest paths

Mars

hashing

Two Arrays

data structures, matrices

Bubble Popping

Restaurant Game

Weights

constructive algorithms, greedy, two pointers

The Sum of Good Numbers

hashing, math, string suffix structures, strings

RBS

binary search, bitmasks, brute force, data structures, dp

Ideal Farm

constructive algorithms, math

Alice and Recoloring 2

constructive algorithms, flows, graph matchings, greedy

Alice and Recoloring 1

constructive algorithms, greedy

Bored Bakry

bitmasks, greedy, math, two pointers

Jumping Through the Array

binary search, data structures, graphs, two pointers

Omkar and Mosaic

combinatorics, constructive algorithms, math

Poachers

dp, games, graphs, trees

Non-equal Neighbours

combinatorics, dp, math

Frequency Queries

data structures, dfs and similar, trees

Eligible Segments

geometry

Strange LCS

bitmasks, dp, graphs, greedy, strings

Omkar and Tours

data structures, divide and conquer, sortings, trees

Omkar and Time Travel

data structures, math

Defender of Childhood Dreams

bitmasks, constructive algorithms, divide and conquer

Kuzya and Homework

data structures, number theory

Korney Korneevich and XOR (hard version)

binary search, brute force, dp, greedy, two pointers

Problems for Codeforces

combinatorics, fft, math

Railway Construction

brute force, constructive algorithms, data structures, graphs, shortest paths

Subsequence

brute force, divide and conquer, dp, greedy, trees

Mathematics Curriculum

brute force, combinatorics, dp, trees

The Mind

constructive algorithms, interactive, probabilities

Labyrinth

binary search, dsu, greedy

Kingdom of Islands

brute force, graphs, implementation

Just Kingdom

brute force, data structures, dfs and similar

Interactive Rays

geometry, interactive

Game of Chance

math, probabilities

Framing Pictures

geometry

Dragon Curve

Cactus Lady and her Cing

Building Forest Trails

data structures, dsu

Anti-Tetris

constructive algorithms, graphs, shortest paths

Managing Telephone Poles

data structures, geometry

Finding Expected Value

math

Eye-Pleasing City Park Tour

data structures, trees

Cyclic Sum

data structures, fft, number theory

Occurrences

combinatorics, dfs and similar, dp, dsu, fft, graphs

Coloring

combinatorics, constructive algorithms, implementation, math

Stations

data structures

Polygon

binary search, dp, geometry

Bridge Club

flows, graph matchings, graphs, greedy

Paint

dp, greedy

Xor of 3

brute force, constructive algorithms, greedy, two pointers

Two Railroads

*special problem

Physical Examination

*special problem, binary search, data structures

Laser Beams

*special problem, geometry, probabilities

A Battle Against a Dragon

*special problem, data structures, dp

Palindromic Hamiltonian Path

brute force, dfs and similar, dp, graphs, hashing

Playoff Restoration

bitmasks, brute force, hashing, implementation, meet-in-the-middle

One-Four Overload

2-sat, constructive algorithms, dfs and similar, dsu, graphs, implementation

Xor-quiz

constructive algorithms, dp, interactive, math, number theory

Four Vertices

constructive algorithms, data structures, graphs, greedy, implementation, shortest paths

Points Movement

data structures, dp, greedy, implementation, sortings

Tubular Bells

interactive, math, number theory, probabilities

Rescue Niwen!

dp, greedy, string suffix structures, strings

Mocha and Diana (Hard Version)

brute force, constructive algorithms, dfs and similar, dsu, graphs, greedy, trees, two pointers

Strange Sort

data structures, sortings

Down Below

binary search, dfs and similar, graphs, greedy, meet-in-the-middle, shortest paths

Top-Notch Insertions

combinatorics, data structures

Assiut Chess

brute force, constructive algorithms, interactive

DIY Tree

graphs, greedy, math, probabilities

Gates to Another World

bitmasks, data structures, dsu, two pointers