Yin Yang

implementation

Balance the Cards

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

Red Blue Tree

data structures, implementation, trees

The Fair Nut's getting crazy

data structures, implementation

Passports

dp, implementation

Fedya the Potter

binary search, implementation, math, number theory

Swiper, no swiping!

graphs, implementation

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

Twilight and Ancient Scroll (harder version)

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

MEX counting

combinatorics, dp, implementation

Air Reform

data structures, dfs and similar, divide and conquer, dsu, graphs, implementation, trees

Qingshan and Daniel

brute force, data structures, greedy, implementation

Strange Permutation

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

Digits of Number Pi

dp, implementation, strings

Cipher

implementation

Grid Sort

implementation

Intranet of Buses

binary search, geometry, implementation, two pointers

Perpetual Motion Machine

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

Harry The Potter

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

Four Vertices

constructive algorithms, data structures, graphs, greedy, implementation, shortest paths

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

Escaping on Beaveractor

data structures, implementation, trees

Sequence Transformation

brute force, data structures, dp, implementation, math

Anagram Paths

dp, implementation, trees

Mirror Room

data structures, implementation

Xenia and String Problem

dp, hashing, implementation, string suffix structures, strings

String Distance

binary search, brute force, data structures, hashing, implementation, 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

Tree or not Tree

data structures, divide and conquer, implementation, trees

Tape Programming

data structures, implementation

Lucky Pair

combinatorics, data structures, implementation

Playing Around the Table

constructive algorithms, greedy, implementation

Johnny and James

greedy, implementation, math, trees

Bear and Chase

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

Delete The Edges

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

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

Polo the Penguin and Lucky Numbers

dp, implementation, math

Twilight and Ancient Scroll (easier version)

dp, hashing, implementation, string suffix structures, strings

Kingdom of Islands

brute force, graphs, implementation

Red-Black Cobweb

data structures, divide and conquer, implementation, trees

The Cells on the Paper

binary search, implementation, sortings

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

New Year and Finding Roots

constructive algorithms, implementation, interactive, trees

Raging Thunder

data structures, divide and conquer, implementation

Rain of Fire

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

Number of Components

dsu, implementation

Serious Business

data structures, divide and conquer, dp, implementation, shortest paths

k-Maximum Subsequence Sum

data structures, flows, graphs, implementation

Little Elephant and Strings

data structures, implementation, string suffix structures, two pointers

Sleeping

combinatorics, implementation, math

Vasily the Bear and Painting Square

bitmasks, combinatorics, dp, implementation

Optimizer

graphs, greedy, hashing, implementation

October 18, 2017

combinatorics, dp, 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

Sagheer and Kindergarten

dfs and similar, graphs, implementation, trees

You Are Given Some Letters...

binary search, implementation, math

Once in a casino

constructive algorithms, greedy, implementation, math

Information Reform

dp, implementation, trees

Tasty Cookie

binary search, constructive algorithms, greedy, implementation

Not Splitting

geometry, graphs, greedy, implementation, shortest paths

Strange Instructions

data structures, greedy, implementation

Colored Cubes

constructive algorithms, implementation, matrices

Swedish Heroes

brute force, dp, implementation

One-Four Overload

2-sat, constructive algorithms, dfs and similar, dsu, graphs, implementation

Christmas Chocolates

dfs and similar, dp, games, graphs, implementation, math, number theory, shortest paths, trees

Minlexes

dp, greedy, implementation, strings

Tree Generator™

data structures, implementation, trees

Fibonacci Additions

brute force, data structures, hashing, implementation, math

Inna and Babies

binary search, data structures, dsu, geometry, implementation

Encoded message

*special problem, implementation

Two Paths

constructive algorithms, dsu, graphs, implementation

Dasha and Photos

brute force, data structures, dp, implementation

Tricky Interactor

constructive algorithms, implementation, interactive

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

Playoff Restoration

bitmasks, brute force, hashing, implementation, meet-in-the-middle

Lamps on a Circle

games, implementation, interactive, math