Legacy

data structures, graphs, shortest paths

Berzerk

dfs and similar, dp, games

Anton and Permutation

brute force, data structures

Anton and School - 2

combinatorics, dp, math, number theory

BF Calculator

*special problem

Twisted Circuit

*special problem, brute force, implementation

Kids' Riddle

*special problem

Intranet of Buses

binary search, geometry, implementation, two pointers

Andryusha and Nervous Barriers

data structures, dp

Axel and Marston in Bitland

bitmasks, dp, graphs, matrices

Underground Lab

constructive algorithms, dfs and similar, graphs

Selling Numbers

dp, sortings

Parquet Re-laying

constructive algorithms

Peterson Polyglot

brute force, dfs and similar, dsu, hashing, strings, trees

Hanoi Factory

brute force, data structures, dp, greedy, sortings

Sherlock and the Encrypted Data

bitmasks, combinatorics, dp

Sherlock's bet to Moriarty

constructive algorithms, data structures, divide and conquer, geometry, graphs, implementation, trees

The Holmes Children

math, number theory

The Door Problem

2-sat, dfs and similar, dsu, graphs

University Schedule

*special problem

Bars

*special problem, binary search

Stepan's Series

*special problem, dp

Composing Of String

*special problem, dp

Repairing Of String

*special problem, constructive algorithms

Perfectionist Arkadiy

*special problem, number theory

Pens And Days Of Week

*special problem, binary search, number theory

Big Number and Remainder

*special problem, math, number theory

Significant Cups

*special problem, binary search, data structures, two pointers

Amusement Park

*special problem, ternary search

Test Data Generation

combinatorics, divide and conquer, dp, fft, math, number theory

Blog Post Rating

data structures, sortings

Perishable Roads

dp, graphs, shortest paths

Prairie Partition

binary search, constructive algorithms, greedy, math

Dynamic Problem Scoring

brute force, greedy

Verifying Kingdom

binary search, divide and conquer, interactive, trees

Varying Kibibits

bitmasks, dp

Vulnerable Kerbals

constructive algorithms, dp, graphs, math, number theory

Bear and Isomorphic Points

geometry, two pointers

Bear and Rectangle Strips

dp, greedy

Bear and Company

dp

Bear and Tree Jumps

dfs and similar, dp, trees

The Winds of Winter

binary search, data structures

Barrels and boxes

brute force, combinatorics, math, number theory, probabilities

Game of Stones

bitmasks, dp, games

Jon and Orbs

dp, math, probabilities

Change-free

greedy

Cartons of milk

binary search, data structures, greedy, sortings, two pointers

Garland

dfs and similar, graphs, greedy, trees

The Queue

brute force, greedy

Mahmoud and a xor trip

bitmasks, constructive algorithms, data structures, dfs and similar, dp, math, trees

Mahmoud and a Dictionary

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

Math, math everywhere

brute force, dp, math, meet-in-the-middle, number theory

Souvenirs

data structures

Tree Folding

dfs and similar, dp, greedy, implementation, trees

Timofey and our friends animals

data structures, divide and conquer, dsu

Timofey and a flat tree

data structures, graphs, hashing, shortest paths, trees

Timofey and remoduling

brute force, implementation, math, number theory

Timofey and rectangles

constructive algorithms, geometry

Tree nesting

combinatorics, graphs, trees

Radio stations

binary search, data structures

Maximum path

dp, greedy, implementation

Two strings

binary search, hashing, strings, two pointers

Dasha and Photos

brute force, data structures, dp, implementation

Dasha and Puzzle

constructive algorithms, dfs and similar, graphs, greedy, trees

Geometrical Progression

brute force, math, number theory

Broken Tree

dfs and similar, dp, graphs, greedy, trees

Ability To Convert

constructive algorithms, dp, greedy, math, strings

Can Bash Save the Day?

data structures, divide and conquer, graphs, trees

Team Rocket Rises Again

data structures, graphs, shortest paths

Bash Plays with Functions

brute force, combinatorics, dp, number theory

Felicity's Big Secret Revealed

bitmasks, dp

Long number

expression parsing, math, number theory

Byteland coins

combinatorics, dp, math

Bacterial Melee

brute force, combinatorics, dp, string suffix structures

Nikita and stack

data structures

PolandBall and Many Other Balls

combinatorics, divide and conquer, dp, fft, math, number theory

PolandBall and Gifts

bitmasks, dp, greedy

PolandBall and White-Red graph

constructive algorithms, graphs, shortest paths

PolandBall and Polygon

data structures

Dasha and cyclic table

bitmasks, brute force, fft, strings, trees

Fedor and coupons

binary search, data structures, greedy, sortings

Vladik and chat

brute force, constructive algorithms, dp, implementation, strings

Interactive Bulls and Cows (Hard)

brute force, constructive algorithms, interactive

New Year and Snowy Grid

dfs and similar, dsu, graphs, interactive

New Year and Binary Tree Paths

bitmasks, brute force, combinatorics, dp

New Year and Finding Roots

constructive algorithms, implementation, interactive, trees

New Year and Old Subsequence

data structures, divide and conquer, dp, matrices

Inversions After Shuffle

data structures, probabilities

Leaving Auction

binary search, data structures

Santa Clauses and a Soccer Championship

constructive algorithms, dfs and similar, graphs, trees

Santa Claus and Tangerines

binary search, data structures, greedy, two pointers

Santa Claus and a Palindrome

constructive algorithms, data structures, greedy

Igor and Interesting Numbers

brute force, combinatorics, dp, math

New Roads

constructive algorithms, graphs, trees

Music in Car

data structures, greedy, two pointers

Hongcow Masters the Cyclic Shift

strings, two pointers

Hongcow Draws a Circle

geometry

Hongcow Buys a Deck of Cards

bitmasks, brute force, dp

Vladik and cards

binary search, bitmasks, brute force, dp

Arpa’s abnormal DNA and Mehrdad’s deep interest

data structures, string suffix structures