Counter Attack

data structures, dsu, graphs, hashing, sortings

Ilya and Roads

dp

Okabe and El Psy Kongroo

dp, matrices

Vanya and Brackets

brute force, dp, expression parsing, greedy, implementation, strings

Magic Trick

combinatorics, math, probabilities

Mahmoud and Ehab and the function

binary search, data structures, sortings

Boredom

data structures

Caisa and Tree

brute force, dfs and similar, math, number theory, trees

Duff in Beach

dp

Yet Another Number Game

dp, games

Performance Review

data structures

Below the Diagonal

constructive algorithms, greedy, math

Black and White Tree

constructive algorithms, dsu, graphs, greedy, trees

Village (Minimum)

*special problem, dp, greedy, trees

New Roads

constructive algorithms, graphs, trees

Job Lookup

constructive algorithms, dp, shortest paths, trees

Trip to Saint Petersburg

data structures

Level Generation

binary search, math, ternary search

Main Sequence

greedy, implementation

Petya and Spiders

bitmasks, dp, dsu

Guide

Coin Troubles

dp

Compartments

combinatorics, constructive algorithms, greedy, implementation

Longest Array Deconstruction

data structures, divide and conquer, dp, sortings

Mysterious Code

dp, strings

Optimal Polygon Perimeter

dp, geometry

Getting Deals Done

binary search, data structures

Start of the session

constructive algorithms

There and Back Again

String Mark

combinatorics, math, strings

Frog Jumping

dfs and similar, math, number theory

Valera and Swaps

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

Area of a Star

geometry

Maximum Questions

data structures, dp, strings

World Eater Brothers

dfs and similar, dp, greedy, trees

Hidden Fortress

interactive, math

Bulmart

binary search, dfs and similar

Bulbo

dp, greedy

Beavermuncher-0xFF

dfs and similar, dp, dsu, greedy, trees

Runner's Problem

dp, matrices, sortings

Playlist

math, probabilities, sortings

Hexagons

binary search, implementation, math

Exploration plan

binary search, flows, graph matchings, shortest paths

Chessboard Billiard

dfs and similar, dsu, graphs, number theory

The table

constructive algorithms, greedy

Social Network

greedy, two pointers

Rosetta Problem

*special problem

Field Photography

bitmasks, data structures, sortings

Inna and Binary Logic

binary search, bitmasks, data structures

Vasily the Bear and Beautiful Strings

combinatorics, math, number theory

Heidi Learns Hashing (Medium)

brute force, number theory

Maximize The Value

data structures, sortings

Little Elephant and Shifts

data structures

Blueprint for Seating

combinatorics, divide and conquer, math

Hostname Aliases

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

Daleks' Invasion (medium)

dfs and similar, graphs, shortest paths, trees

Fools and Foolproof Roads

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

Elections

brute force

Blackboard Fibonacci

brute force, math

Third Month Insanity

dp, probabilities, trees

Berland Elections

greedy, sortings

Space Rescuers

geometry, ternary search

Casinos and travel

dp

Kamal-ol-molk's Painting

brute force, constructive algorithms, greedy

Unsolvable

math, number theory

Harry Potter and the Golden Snitch

binary search, geometry

Quest

dp, greedy

Chicken or Fish?

greedy

Parade

data structures, sortings

Diverging Directions

data structures, dfs and similar, trees

Graph

*special problem, binary search, dfs and similar, dp, math, ternary search

Polycarp's Picture Gallery

constructive algorithms, greedy

Count BFS Graph

combinatorics, dp

Broken Monitor

brute force, constructive algorithms, greedy, implementation

Constants in the language of Shakespeare

constructive algorithms, dp, greedy

Bombing

binary search, dp, probabilities

Send the Fool Further! (medium)

dp, trees

The Light Square

2-sat, dfs and similar, greedy

Moon Craters

dp, sortings

Ivan the Fool VS Gorynych the Dragon

dp, games, graphs

Mushroom Strife

brute force, dfs and similar

Periodical Numbers

combinatorics, dp, number theory

Conveyor

sortings, two pointers

New York Hotel

greedy, math

More Reclamation

games

Writing a Song

brute force, dp, strings

Context Advertising

dp, two pointers

Mice

greedy, two pointers

The Wall (hard)

dp

Xenia and Dominoes

bitmasks, dfs and similar, dp

Dormitory

dp, implementation

Crosses

brute force, implementation

Piet

implementation

Marmots (easy)

math

Optimizer

data structures, greedy, sortings

White, Black and White Again

combinatorics, number theory

Game with Points

dp, graphs, implementation, shortest paths

Cowboys

combinatorics, dp, math

Property

greedy, sortings

Zigzag

data structures