Design Tutorial: Inverse the Problem

dfs and similar, dsu, shortest paths, trees

Design Tutorial: Make It Nondeterministic

greedy

Design Tutorial: Learn from Life

Design Tutorial: Learn from Math

math, number theory

MUH and Lots and Lots of Segments

data structures, dsu

MUH and Cube Walls

string suffix structures, strings

MUH and House of Cards

binary search, brute force, greedy, math

MUH and Important Things

implementation, sortings

MUH and Sticks

implementation

Array Sorting

*special problem

Hamming Distance

*special problem

Pairwise Sums

*special problem

Chessboard

*special problem

Caesar Cipher

*special problem

Eval

*special problem

Hexakosioihexekontahexaphobia

*special problem

Crystal Ball Sequence

*special problem, implementation

Chat Online

implementation

I Wanna Be the Guy

greedy, implementation

Permanent

dp, graph matchings, math, meet-in-the-middle

Tree

graph matchings

Hack it!

binary search, constructive algorithms, math

Two Sets

2-sat, dfs and similar, dsu, graph matchings, greedy

24 Game

constructive algorithms, greedy, math

Alex and Complicated Task

data structures, dp, greedy

Fedor and Essay

dfs and similar, dp, graphs, hashing, strings

George and Job

dp, implementation

Fedor and New Game

bitmasks, brute force, constructive algorithms, implementation

George and Accommodation

implementation

Information Graph

dfs and similar, dsu, graphs, trees

Increase Sequence

combinatorics, dp

Number of Ways

binary search, brute force, data structures, dp, two pointers

Wonder Room

brute force, math

Cheap Travel

implementation

Inbox (100500)

implementation

inc ARG

implementation

The Classic Problem

data structures, graphs, shortest paths

World of Darkraft - 2

dp, probabilities

Substitutes in Number

dp

Restore Cube

brute force, geometry

No to Palindromes!

greedy, strings

Caisa and Tree

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

Gargari and Permutations

dfs and similar, dp, graphs, implementation

Gargari and Bishops

greedy, hashing, implementation

Caisa and Pylons

brute force, implementation, math

Caisa and Sugar

brute force, implementation

Appleman and Card Game

greedy

Appleman and Easy Task

brute force, implementation

Appleman and a Game

binary search, shortest paths, strings

Appleman and Complicated Task

dsu, math

Appleman and a Sheet of Paper

data structures, implementation

Appleman and Tree

dfs and similar, dp, trees

Appleman and Toastman

greedy, sortings

Roland and Rose

brute force, geometry, math, sortings

Little Victor and Set

brute force, constructive algorithms, math

Present

binary search, data structures, greedy

Little Dima and Equation

brute force, implementation, math, number theory

Vasya and Socks

brute force, implementation, math

Pashmak and Graph

dp, sortings

Pashmak and Parmida's problem

data structures, divide and conquer, sortings

Pashmak and Buses

combinatorics, constructive algorithms, math

Pashmak and Flowers

combinatorics, implementation, sortings

Pashmak and Garden

implementation

An easy problem about trees

dp, games, greedy, trees

Flow Optimality

constructive algorithms, flows, math

Bingo!

combinatorics, math, probabilities

Elections

brute force

Distributed Join

greedy

Golden System

math, meet-in-the-middle

Fedya and Maths

math, number theory

Laptops

sortings

Function

data structures

Serega and Fun

data structures

Civilization

dfs and similar, dp, dsu, ternary search, trees

A Lot of Games

dfs and similar, dp, games, implementation, strings, trees

Boredom

dp

Little Pony and Sort by Shift

implementation

Little Pony and Crystal Mine

implementation

Little Pony and Lord Tirek

data structures

Little Pony and Elements of Harmony

dp, matrices

Little Pony and Summer Sun Celebration

constructive algorithms, dfs and similar, graphs

Little Pony and Harmony Chest

bitmasks, brute force, dp

Little Pony and Expected Maximum

probabilities

Permutation

data structures, divide and conquer, hashing

Three strings

data structures, dsu, string suffix structures, strings

Washer, Dryer, Folder

greedy, implementation

Magic Trick

combinatorics, math, probabilities

4-point polyline

brute force, constructive algorithms, geometry, trees

Eevee

brute force, implementation, strings

Devu and Flowers

bitmasks, combinatorics, number theory

Count Good Substrings

math

Predict Outcome of the Game

brute force, implementation, math

Sort the Array

implementation, sortings

Game With Sticks

implementation

Jzzhu and Sequences

implementation, math

Jzzhu and Children

implementation

Jzzhu and Squares

dp, math, number theory

Jzzhu and Numbers

bitmasks, combinatorics, dp

Jzzhu and Apples

constructive algorithms, number theory

Jzzhu and Cities

graphs, greedy, shortest paths