Towers

brute force, constructive algorithms, greedy, implementation, sortings

Wavy numbers

brute force, dfs and similar, meet-in-the-middle, sortings

Red-Green Towers

dp

Table Decorations

greedy

Dreamoon and Notepad

data structures

Dreamoon and Binary

dp, strings

Dreamoon and Strings

dp, strings

Dreamoon and Sets

constructive algorithms, greedy, math

Dreamoon and Sums

math

Meta-universe

data structures

Strongly Connected City 2

dfs and similar

CGCDSSQ

brute force, data structures, math

Kamal-ol-molk's Painting

brute force, constructive algorithms, greedy

Strongly Connected City

brute force, dfs and similar, graphs, implementation

Ant colony

data structures, math, number theory

Pillars

binary search, data structures, dp, sortings, trees

Flowers

dp

Captain Marmot

brute force, geometry

Design Tutorial: Increase the Constraints

bitmasks, data structures, fft

Design Tutorial: Change the Goal

constructive algorithms, math, matrices

Design Tutorial: Learn from a Game

constructive algorithms, implementation

Design Tutorial: Inverse the Problem

dfs and similar, dsu, shortest paths, trees

Design Tutorial: Make It Nondeterministic

greedy

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

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

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

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

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

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

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

Pashmak and Graph

dp, sortings

Pashmak and Parmida's problem

data structures, divide and conquer, sortings

Pashmak and Buses

combinatorics, constructive algorithms, math

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

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 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

Devu and Flowers

bitmasks, combinatorics, number theory

Count Good Substrings

math

Predict Outcome of the Game

brute force, implementation, math

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

Jzzhu and Chocolate

greedy, math

Divisors

brute force, dfs and similar, implementation, number theory

Multiplication Table

binary search, brute force

Painting Fence

divide and conquer, dp, greedy

Suffix Structures

implementation, strings

DZY Loves Bridges

math, matrices

DZY Loves Games

math, matrices, probabilities