Prefix Product Sequence

constructive algorithms, math, number theory

Strip

binary search, data structures, dp, two pointers

Fight the Monster

binary search, brute force, implementation

LIS of Sequence

data structures, dp, greedy, hashing, math

Valid Sets

dfs and similar, dp, math, trees

Palindrome Transformation

brute force, greedy, implementation

OR in Matrix

greedy, hashing, implementation

Calculating Function

implementation, math

Valuable Resources

brute force, greedy

Factory

implementation, math, matrices

Sign on Fence

binary search, constructive algorithms, data structures

Kindergarten

data structures, dp, greedy

Strange Sorting

implementation, math

Maximum Value

binary search, math, sortings, two pointers

Bits

bitmasks, constructive algorithms

Friends and Presents

binary search, math

Counterexample

brute force, implementation, math, number theory

ELCA

data structures, trees

Random Function and Tree

combinatorics, dp, trees

Game with Strings

bitmasks, dp, probabilities

Interesting Array

constructive algorithms, data structures, trees

Diverse Permutation

constructive algorithms, greedy

Parking Lot

data structures, divide and conquer

Parcels

dp, graphs

Riding in a Lift

combinatorics, dp

Long Jumps

binary search, greedy, implementation

Exams

greedy, sortings

Towers

brute force, constructive algorithms, greedy, implementation, sortings

Expression

brute force, math

Wavy numbers

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

Red-Green Towers

dp

Table Decorations

greedy

Random Teams

combinatorics, constructive algorithms, greedy, math

Initial Bet

implementation

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

Dreamoon and WiFi

bitmasks, brute force, combinatorics, dp, math, probabilities

Dreamoon and Stairs

implementation, 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

Bayan Bus

implementation

Ant colony

data structures, math, number theory

Pillars

binary search, data structures, dp, sortings, trees

Flowers

dp

Captain Marmot

brute force, geometry

Worms

binary search, implementation

Keyboard

implementation

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

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