Red Blue Tree

data structures, implementation, trees

Balance the Cards

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

The Fair Nut's getting crazy

data structures, implementation

Swiper, no swiping!

graphs, implementation

Passports

dp, implementation

Fedya the Potter

binary search, implementation, math, number theory

Multithreading (Hard Version)

combinatorics, implementation, math

Johnny and New Toy

data structures, implementation, math

Showing Off

flows, graph matchings, greedy, implementation

Chess Rush

*special problem, combinatorics, dp, implementation, math

JS Minification

greedy, implementation

Qingshan and Daniel

brute force, data structures, greedy, implementation

Strange Permutation

binary search, combinatorics, data structures, dp, graphs, implementation, two pointers

Twilight and Ancient Scroll (harder version)

dp, hashing, implementation, string suffix structures, strings, two pointers

Digits of Number Pi

dp, implementation, strings

Cipher

implementation

Grid Sort

implementation

Intranet of Buses

binary search, geometry, implementation, two pointers

Harry The Potter

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

Perpetual Motion Machine

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

Get Ready for the Battle

constructive algorithms, implementation

Fibonacci-ish II

data structures, implementation

Turtle

dp, implementation

Gnomes of Might and Magic

data structures, graphs, implementation, shortest paths

Tree and Table

dfs and similar, dp, implementation, trees

Sequence Transformation

data structures, dp, implementation, math

Escaping on Beaveractor

data structures, implementation, trees

Anagram Paths

dp, implementation, trees

Mirror Room

data structures, implementation

Xenia and String Problem

dp, hashing, implementation, string suffix structures, strings

Red and Black Tree

dp, implementation, math

Harry Potter and Moving Staircases

dfs and similar, implementation

Deja Vu

constructive algorithms, graphs, implementation

Two Rooted Trees

data structures, implementation, trees

Karen and Neighborhood

binary search, constructive algorithms, implementation

Tape Programming

data structures, implementation

Tree or not Tree

data structures, divide and conquer, implementation, trees

Lucky Pair

combinatorics, data structures, implementation

Delete The Edges

brute force, constructive algorithms, dfs and similar, graphs, implementation

Johnny and James

greedy, implementation, math, trees

Bear and Chase

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

Black Widow

dp, graphs, implementation, math

Design Tutorial: Learn from a Game

constructive algorithms, implementation

Hamming Triples

implementation, math, two pointers

Sasha and a Patient Friend

binary search, data structures, implementation

Twilight and Ancient Scroll (easier version)

dp, hashing, implementation, string suffix structures, strings

Polo the Penguin and Lucky Numbers

dp, implementation, math

Red-Black Cobweb

data structures, divide and conquer, implementation, trees

Sherlock's bet to Moriarty

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

Cyclic Cipher

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

Raging Thunder

data structures, divide and conquer, implementation

Rain of Fire

binary search, data structures, dfs and similar, dsu, graphs, implementation

New Year and Finding Roots

constructive algorithms, implementation, interactive, trees

Number of Components

dsu, implementation

k-Maximum Subsequence Sum

data structures, flows, graphs, implementation

Little Elephant and Strings

data structures, implementation, string suffix structures, two pointers

Optimizer

graphs, greedy, hashing, implementation

Vasily the Bear and Painting Square

bitmasks, combinatorics, dp, implementation

Sleeping

combinatorics, implementation, math

Entertaining Geodetics

brute force, dsu, implementation

Robot in Basement

bitmasks, brute force, implementation

Pairs

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

Concise and clear

brute force, greedy, implementation, math

You Are Given Some Letters...

binary search, implementation, math

Sagheer and Kindergarten

dfs and similar, graphs, implementation, trees

Once in a casino

constructive algorithms, greedy, implementation, math

Information Reform

dp, implementation, trees

Tasty Cookie

binary search, constructive algorithms, greedy, implementation

Colored Cubes

constructive algorithms, implementation, matrices

Swedish Heroes

brute force, dp, implementation

Minlexes

dp, greedy, implementation, strings

Tree Generator™

data structures, implementation, trees

Inna and Babies

binary search, data structures, dsu, geometry, implementation

Encoded message

*special problem, implementation

Two Paths

constructive algorithms, dsu, graphs, implementation

Tricky Interactor

constructive algorithms, implementation, interactive

Dasha and Photos

brute force, data structures, dp, implementation

Kay and Eternity

brute force, implementation, sortings

Strange Sorting

implementation, math

Intriguing Selection

brute force, constructive algorithms, implementation, interactive, sortings

Defining Macros

dp, expression parsing, implementation

Number Challenge

combinatorics, dp, implementation, math, number theory

Timofey and remoduling

brute force, implementation, math, number theory

Lamps on a Circle

games, implementation, interactive, math

Super Jaber

dfs and similar, graphs, implementation, shortest paths

Graph and Queries

data structures, dsu, graphs, implementation, trees

Greedy Shopping

binary search, data structures, divide and conquer, greedy, implementation

Combostone

games, implementation

Shooting Gallery

data structures, implementation

Two Circles

brute force, data structures, implementation

Deputies

constructive algorithms, graphs, greedy, implementation

Lucky Segments

binary search, implementation, two pointers

Shaass and Painter Robot

brute force, implementation, number theory

Cycle

brute force, dfs and similar, implementation

Digits

brute force, implementation, math

Game with Tokens

data structures, games, implementation

Azembler

brute force, implementation

Plane Tiling

geometry, implementation, math

One Node is Gone

constructive algorithms, implementation, trees

Strange Radiation

binary search, implementation, math