Searching Rectangles

binary search, constructive algorithms, interactive

Complete the MST

bitmasks, brute force, data structures, dfs and similar, dsu, graphs, greedy, trees

Little Elephant and Elections

brute force, combinatorics, dp

Substrings in a String

bitmasks, brute force, data structures, string suffix structures, strings

Number Transformation II

greedy, math

Ilya and Roads

dp

Okabe and El Psy Kongroo

dp, matrices

Fake News (hard)

string suffix structures

Cost Equilibrium

combinatorics, constructive algorithms, math, sortings

Road to 1600

brute force, constructive algorithms

Vanya and Brackets

brute force, dp, expression parsing, greedy, implementation, strings

Kirill and Company

bitmasks, brute force, dfs and similar, dp, flows, graphs, shortest paths

Beautiful Decomposition

dp, games, greedy, number theory

Intersection and Union

data structures, dp, matrices, probabilities

Covered Points

fft, geometry, number theory

Chaotic Merge

combinatorics, dp, math, strings

Fractal

implementation

Hot Bath

binary search, brute force, math

Trading Business

greedy, sortings

Red-Blue Matrix

brute force, constructive algorithms, implementation, sortings

Hit Ball

geometry, implementation, math

Knapsack

dfs and similar, dp, greedy

MYSTERIOUS LANGUAGE

*special problem

Ehab and a component choosing problem

dp, greedy, math, trees

Magic Trick

combinatorics, math, probabilities

Purple Crayon

data structures, dfs and similar, games, graphs, greedy, math, sortings, trees

Police Patrol

greedy, implementation, math, ternary search

Anton and Ira

constructive algorithms, greedy, math

Возможно, вы знаете этих людей?

implementation

Alyona and towers

data structures

New Year Domino

data structures, dp, dsu

Educational Game

greedy

Digital Root

number theory

Mastermind

constructive algorithms, graph matchings, greedy, implementation, sortings, two pointers

Guess the Root

brute force, interactive, math

Sonya and Matrix

brute force, constructive algorithms, implementation

Mahmoud and Ehab and the function

binary search, data structures, sortings

Expected Destruction

combinatorics, dp, math, probabilities

Boredom

data structures

President's Path

dp, graphs, shortest paths

Paint

dp, greedy

Sereja and Squares

binary search, data structures, hashing

Table

bitmasks, combinatorics, dp, math

The Fox and the Complete Tree Traversal

constructive algorithms, dp, implementation, math, trees

Caisa and Tree

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

Number Busters

binary search, math

Orientation of Edges

dfs and similar, graphs

Oh Sweet Beaverette

data structures, sortings

Interactive Treasure Hunt

brute force, constructive algorithms, geometry, interactive, math

It's a bird! No, it's a plane! No, it's AaParsa!

constructive algorithms, graphs, shortest paths

Calendar Reform

*special problem, number theory

DFS Trees

dfs and similar, dsu, graphs, greedy, sortings, trees

Lucky Country

dp, dsu, graphs

Farm Game

combinatorics, games

Is it rated - 3

*special problem, combinatorics, dp, math

Johnny and Megan's Necklace

binary search, bitmasks, constructive algorithms, dfs and similar, dsu, graphs

King's Puzzle

constructive algorithms

Brackets in Implications

constructive algorithms, greedy, implementation, math

Funny Game

dp, games

Duff in Beach

dp

Yet Another Number Game

dp, games

Bear and Forgotten Tree 2

dfs and similar, dsu, graphs, trees

Palindromes in a Tree

bitmasks, data structures, divide and conquer, trees

GCD of Polynomials

constructive algorithms, math

Vitaly and Advanced Useless Algorithms

dp, greedy, implementation

LaTeX Expert

New Year and Rainbow Roads

graphs, greedy, implementation

Neural Network country

dp, matrices

Arpa and a game with Mojtaba

bitmasks, dp, games

Three Chairs

bitmasks, brute force, combinatorics, data structures, dp, number theory, sortings

Lucky Tickets

divide and conquer, dp, fft

Three Integers Again

*special problem, math

Difficult Mountain

data structures, dp, greedy, sortings

Chips

constructive algorithms, implementation

Permutation

data structures, divide and conquer, hashing

Blog Photo

binary search, implementation

Karen and Test

brute force, combinatorics, constructive algorithms, math

Darth Vader and Tree

dp, matrices

Performance Review

data structures

Maxim and Restaurant

dp, math, probabilities

Balance (Hard version)

brute force, data structures, number theory

EKG

brute force, dfs and similar

Plane of Tanks: Pro

implementation

Easy Tape Programming

brute force, implementation

Set Theory

brute force, constructive algorithms

Dexterina’s Lab

games, matrices, probabilities

Linear Kingdom Races

data structures, dp

Relatively Prime Powers

combinatorics, math, number theory

Count Supersequences

combinatorics, dp, math

Routing

bitmasks, brute force, dfs and similar, dp, graphs

Oranges and Apples

constructive algorithms, sortings

The Hidden Pair (Easy Version)

binary search, dfs and similar, graphs, interactive, shortest paths, trees

Graph Subset Problem

constructive algorithms, data structures, graphs

Split the Tree

binary search, data structures, dp, greedy, trees

Brevity is Soul of Wit

graph matchings

Bracket Cost

binary search, data structures, divide and conquer, dp, greedy, strings

Robot Cleaner Revisit

implementation, math, probabilities

Ehab and the Expected GCD Problem

combinatorics, dp, math, number theory

Compressed Tree

dfs and similar, dp, graphs, greedy, sortings, trees

Almost Perfect

combinatorics, fft, math