Red Blue Tree

data structures, implementation, trees

Swiper, no swiping!

graphs, implementation

Fedya the Potter

binary search, implementation, math, number theory

The Fair Nut's getting crazy

data structures, implementation

JS Minification

greedy, implementation

Harry The Potter

brute force, constructive algorithms, dp, fft, implementation, math

Passports

dp, implementation

Digits of Number Pi

dp, implementation, strings

Cipher

implementation

Grid Sort

implementation

Optimizer

graphs, greedy, hashing, implementation

Perpetual Motion Machine

constructive algorithms, dp, graphs, implementation, math, trees

Turtle

dp, implementation

Combostone

games, implementation

Gnomes of Might and Magic

data structures, graphs, implementation, shortest paths

Deja Vu

constructive algorithms, graphs, implementation

Intranet of Buses

binary search, geometry, implementation, two pointers

Tree and Table

dfs and similar, dp, implementation, trees

Sequence Transformation

data structures, dp, implementation, math

Get Ready for the Battle

constructive algorithms, implementation

Mirror Room

data structures, implementation

Red and Black Tree

dp, implementation, math

Harry Potter and Moving Staircases

dfs and similar, implementation

Escaping on Beaveractor

data structures, implementation, trees

Two Rooted Trees

data structures, implementation, trees

Anagram Paths

dp, implementation, trees

Karen and Neighborhood

binary search, constructive algorithms, implementation

Bear and Chase

brute force, dfs and similar, graphs, implementation, math, probabilities

Dasha and Photos

brute force, data structures, dp, implementation

Tree Generator™

data structures, implementation, trees

Tree or not Tree

data structures, divide and conquer, implementation, trees

Sasha and a Patient Friend

binary search, data structures, implementation

Red-Black Cobweb

data structures, divide and conquer, implementation, trees

Polo the Penguin and Lucky Numbers

dp, implementation, math

You Are Given Some Letters...

binary search, implementation, math

Xenia and String Problem

dp, hashing, implementation, string suffix structures, strings

Lucky Pair

combinatorics, data structures, implementation

Concise and clear

brute force, greedy, implementation, math

Black Widow

dp, graphs, implementation, math

Fibonacci-ish II

data structures, implementation

Cyclic Cipher

chinese remainder theorem, data structures, implementation, number theory, two pointers

Pasha and Pipe

binary search, brute force, combinatorics, dp, implementation

k-Maximum Subsequence Sum

data structures, flows, graphs, implementation

Little Elephant and Strings

data structures, implementation, string suffix structures, two pointers

Misha and Palindrome Degree

binary search, combinatorics, implementation

Museums Tour

dp, graphs, implementation

Design Tutorial: Learn from a Game

constructive algorithms, implementation

Hamming Triples

implementation, math, two pointers

Tape Programming

data structures, implementation

Shaass and Painter Robot

brute force, implementation, number theory

Sherlock's bet to Moriarty

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

Once in a casino

constructive algorithms, greedy, implementation, math

Sagheer and Kindergarten

dfs and similar, graphs, implementation, trees

Digits

brute force, implementation, math

Information Reform

dp, implementation, trees

One Node is Gone

constructive algorithms, implementation, trees

New Year and Finding Roots

constructive algorithms, implementation, interactive, trees

Maze 1D

binary search, greedy, implementation

Intriguing Selection

brute force, constructive algorithms, implementation, interactive, sortings

Edo and Magnets

brute force, greedy, implementation, two pointers

Powerful array

data structures, implementation, math, two pointers

Help King

implementation, probabilities, trees

Vasily the Bear and Painting Square

bitmasks, combinatorics, dp, implementation

Sleeping

combinatorics, implementation, math

Entertaining Geodetics

brute force, dsu, implementation

Shooting Gallery

data structures, implementation

Suns and Rays

constructive algorithms, dfs and similar, implementation

Robot in Basement

bitmasks, brute force, implementation

Inna and Babies

binary search, data structures, dsu, geometry, implementation

Two Circles

brute force, data structures, implementation

Pairs

dfs and similar, dp, dsu, graphs, implementation, trees

Binary Key

dp, greedy, implementation

Game with Tokens

data structures, games, implementation

Berland Local Positioning System

constructive algorithms, greedy, hashing, implementation

Dima and Kicks

brute force, dsu, graphs, implementation

Rats

brute force, dfs and similar, graphs, implementation, shortest paths

Kay and Eternity

brute force, implementation, sortings

Colored Cubes

constructive algorithms, implementation, matrices

Tanks

dp, greedy, implementation

Strange Sorting

implementation, math

Number Challenge

combinatorics, dp, implementation, math, number theory

Vanya and Balloons

binary search, brute force, dp, implementation

Working routine

data structures, implementation

Anton and School

bitmasks, constructive algorithms, implementation, math

GukiZ and GukiZiana

binary search, data structures, implementation

BerOS file system

implementation

INI-file

*special problem, implementation

Inverse Function

implementation

Suns and Rays

dfs and similar, implementation

Greedy Elevator

data structures, implementation

Two Paths

constructive algorithms, dsu, graphs, implementation

Tricky Interactor

constructive algorithms, implementation, interactive

Touchy-Feely Palindromes

*special problem, implementation

Strange Radiation

binary search, implementation, math

New Year and Cleaning

binary search, implementation

Map

data structures, implementation, sortings

Vus the Cossack and a Field

divide and conquer, implementation, math

Defining Macros

dp, expression parsing, implementation

Sereja and Tree

graphs, implementation

The Coronation

graphs, implementation