Diverging Directions

data structures, dfs and similar, trees

Parade

data structures, sortings

E-reader Display

constructive algorithms, greedy

Optimal Sum

data structures, greedy

Chicken or Fish?

greedy

Diverse Substrings

dp, strings, two pointers

Calendar

greedy, strings

Sweets Game

bitmasks, dfs and similar, dp, games, implementation

Out of Controls

*special problem

BF Calculator

*special problem

Arrow

geometry

Happy Farm 5

geometry

Quest

dp, greedy

Crossword

implementation

Special Grid

brute force, dp, greedy

2048

bitmasks, dp

Maxim and Matrix

constructive algorithms, dp, math

Harry Potter and the Golden Snitch

binary search, geometry

Kamal-ol-molk's Painting

brute force, constructive algorithms, greedy

Unsolvable

math, number theory

Robo-Footballer

binary search, geometry

Letter A

geometry, implementation

General Mobilization

data structures, dfs and similar, sortings

Closing ceremony

greedy

Table with Letters - 2

brute force, two pointers

Casinos and travel

dp

Parquet

combinatorics, constructive algorithms, greedy, implementation

Kids' Riddle

*special problem

Space Rescuers

geometry, ternary search

Inna and Sequence

binary search, data structures, dp, trees

Third Month Insanity

dp, probabilities, trees

Berland Elections

greedy, sortings

What Has Dirichlet Got to Do with That?

dp, games

Blackboard Fibonacci

brute force, math

Education Reform

dp

Log Stream Analysis

binary search, brute force, implementation, strings

Elections

brute force

Tanya and Colored Candies

*special problem, dp

Death Stars (medium)

hashing, strings

Fools and Foolproof Roads

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

Daleks' Invasion (medium)

dfs and similar, graphs, shortest paths, trees

Blueprint for Seating

combinatorics, divide and conquer, math

Hostname Aliases

*special problem, binary search, data structures, implementation, sortings, strings

Maximize The Value

data structures, sortings

Little Elephant and Shifts

data structures

Heidi Learns Hashing (Medium)

brute force, number theory

Beautiful IP Addresses

brute force

Inna and Binary Logic

binary search, bitmasks, data structures

Vasily the Bear and Beautiful Strings

combinatorics, math, number theory

Field Photography

bitmasks, data structures, sortings

Rosetta Problem

*special problem

Social Network

greedy, two pointers

Exploration plan

binary search, flows, graph matchings, shortest paths

The table

constructive algorithms, greedy

Chessboard Billiard

dfs and similar, dsu, graphs, number theory

Hexagons

binary search, implementation, math

Playlist

math, probabilities, sortings

Runner's Problem

dp, matrices, sortings

Beavermuncher-0xFF

dfs and similar, dp, dsu, greedy, trees

Xor

brute force

Bulbo

dp, greedy

Chocolate

dfs and similar, implementation

Bulmart

binary search, dfs and similar

Hidden Fortress

interactive, math

Number Transformation

dp, greedy, number theory

Flag 2

dp

World Eater Brothers

dfs and similar, dp, greedy, trees

Minimal Product

Maximum Questions

data structures, dp, strings

Seller Bob

brute force, dp, greedy

Nanami's Digital Board

dsu, implementation

Lemmings

binary search

Journey

brute force, constructive algorithms, implementation

Right Expansion Of The Mind

math

Circle of Numbers

brute force, dfs and similar, implementation

A Piece of Cake

*special problem, implementation

Area of a Star

geometry

Valera and Swaps

constructive algorithms, dsu, graphs, implementation, math, string suffix structures

Frog Jumping

dfs and similar, math, number theory

Little Elephant and Furik and Rubik

math, probabilities

String Mark

combinatorics, math, strings

Numbers

constructive algorithms, implementation

There and Back Again

Idempotent functions

constructive algorithms, graphs, math

Knights

geometry, graphs, shortest paths, sortings

Encryption (medium)

dp

Dynamic Problem Scoring

brute force, greedy

Start of the session

constructive algorithms

Hydra

graphs, sortings

Last Chance

data structures, implementation, strings

Getting Deals Done

binary search, data structures

Something with XOR Queries

brute force, interactive, probabilities

Optimal Polygon Perimeter

dp, geometry

Subway Innovation

greedy, math, two pointers

Mysterious Code

dp, strings

Sofa Thief

brute force, implementation

Longest Array Deconstruction

data structures, divide and conquer, dp, sortings

Compartments

combinatorics, constructive algorithms, greedy, implementation

Coin Troubles

dp

First Digit Law

dp, math, probabilities