New Year's Problem

binary search, greedy, sortings

Trader Problem

data structures, dsu, greedy, sortings

Reverse

bitmasks, constructive algorithms, dfs and similar, implementation, math, strings

Singers' Tour

constructive algorithms, math

Christmas Chocolates

dfs and similar, dp, games, graphs, implementation, math, number theory, shortest paths, trees

Too Many Impostors (hard version)

constructive algorithms, implementation, interactive, math

Too Many Impostors (easy version)

constructive algorithms, implementation, interactive

Keep XOR Low

bitmasks, combinatorics, data structures, divide and conquer, dp, math

Just Add an Edge

dfs and similar, dp, graphs

Tricolor Triangles

brute force, graphs, math, matrices

Lexicographically Small Enough

brute force, data structures, greedy, strings

Keep the Average High

dp, greedy, math

Reindeer Games

binary search, constructive algorithms, data structures, divide and conquer, flows, graphs, shortest paths

Maximum Adjacent Pairs

constructive algorithms, graph matchings

LEGOndary Grandmaster

combinatorics, dp, math

Purple Crayon

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

X(or)-mas Tree

bitmasks, dfs and similar, dsu, graphs, trees

Menorah

brute force, graphs, greedy, math

Divan and a Cottage

binary search, data structures

Divan and Kostomuksha (hard version)

dp, number theory

Divan and Kostomuksha (easy version)

dp, number theory

Tree Coloring

combinatorics, divide and conquer, fft

Crazy Robot

dfs and similar, graphs

MEX Sequences

dp, math

Max Sum Array

combinatorics, constructive algorithms, greedy, sortings

Armor and Weapons

brute force, dp, greedy, shortest paths

Messages

brute force, dp, greedy, probabilities, sortings

X-Magic Pair

math, number theory

Robot and Candies

data structures, graph matchings, greedy

ATM and Students

binary search, data structures, two pointers

Escape The Maze (hard version)

dfs and similar, dp, greedy, shortest paths, trees

Escape The Maze (easy version)

dfs and similar, greedy, shortest paths, trees, two pointers

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

AmShZ and G.O.A.T.

binary search, brute force, greedy, implementation, math

Not Quite Lee

combinatorics, dp, math, number theory

Keshi Is Throwing a Party

binary search, greedy

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

Social Network

dsu, graphs, greedy, implementation, trees

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

Game Master

data structures, dfs and similar, dp, graphs, greedy, two pointers

Banquet Preparations 2

greedy, sortings, two pointers

Banquet Preparations 1

greedy

Robot on the Board 2

brute force, dfs and similar, graphs, implementation

Robot on the Board 1

implementation

Tree Queries

brute force, dp, trees

Arena

combinatorics, dp, math

Red-Blue Matrix

brute force, constructive algorithms, implementation, sortings

PalindORme

combinatorics, dp

Array Equalizer

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

Treelabeling

bitmasks, constructive algorithms, dfs and similar, games, greedy, implementation, trees

October 18, 2017

combinatorics, dp, implementation, math

A Perfect Problem

combinatorics, dp, math

Artistic Partition

divide and conquer, dp, number theory

Extreme Extension

dp, greedy, math, number theory

Moderate Modular Mode

constructive algorithms, math, 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

Optimal Insertion

data structures, divide and conquer, dp, greedy, sortings

Frog Traveler

data structures, dfs and similar, dp, graphs, shortest paths, two pointers

Party Organization

brute force, math, probabilities

Array Game

games, greedy, two pointers

Bob's Beautiful Array

bitmasks, brute force, greedy

Desert

data structures, graphs

Hidden Fortress

interactive, math

Shortest path

brute force, geometry, math, shortest paths

Mars

hashing

Two Arrays

data structures, matrices

Bubble Popping

Bubble Strike

combinatorics, math, probabilities, ternary search

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

Staircases

brute force, combinatorics, data structures, dfs and similar, dp, implementation, math

Training Session

combinatorics, data structures, geometry, implementation, math

Ideal Farm

constructive algorithms, math

Rubik's Cube Coloring (hard version)

brute force, dp, implementation, math, trees

The Number of Imposters

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

Changing Brackets

constructive algorithms, data structures, dp, greedy

Red-Black Number

dfs and similar, dp, implementation, math, meet-in-the-middle

Gardener and Tree

brute force, data structures, dfs and similar, greedy, implementation, trees

Half of Same

brute force, math, number theory

Alice and Recoloring 2

constructive algorithms, flows, graph matchings, greedy

Alice and Recoloring 1

constructive algorithms, greedy

Bored Bakry

bitmasks, greedy, math, two pointers

Hemose in ICPC ?

binary search, dfs and similar, implementation, interactive, math, number theory, trees

Bakry and Partitioning

bitmasks, constructive algorithms, dfs and similar, dp, graphs, trees

Jumping Through the Array

binary search, data structures, graphs, two pointers

Omkar and Mosaic

combinatorics, constructive algorithms, math

Poachers

dp, games, graphs, trees