Vladik and fractions

brute force, constructive algorithms, math, number theory

Sum on Subarrays

constructive algorithms, greedy, math

Representative Edges

brute force, geometry, implementation, math

Edgy Trees

dfs and similar, dsu, graphs, math, trees

Data Structures Fan

binary search, bitmasks, data structures, dp

Unforgivable Curse (hard version)

brute force, constructive algorithms, dfs and similar, dsu, graphs, greedy, strings

Little Dima and Equation

brute force, implementation, math, number theory

Nearly Shortest Repeating Substring

brute force, implementation, number theory, strings

Pipes

dp, implementation

Good Numbers (hard version)

binary search, greedy, math, meet-in-the-middle

Tile Painting

constructive algorithms, math, number theory

Pythagorean Triples

math, number theory

Minimum Grid Path

brute force, data structures, greedy, math

No More Inversions

constructive algorithms, math

Did We Get Everything Covered?

constructive algorithms, dp, greedy, shortest paths, strings

Dubious Cyrpto

binary search, brute force, math, number theory

Painting Eggs

greedy, math

Division

brute force, math, number theory

Restoring the Permutation

constructive algorithms, implementation

Friends and Gifts

constructive algorithms, data structures, math

Knight Tournament

data structures, dsu

A and B

greedy, math

Interesting Story

greedy, sortings, strings

Rings

constructive algorithms, math

Ehab and Path-etic MEXs

constructive algorithms, dfs and similar, greedy, trees

Even Picture

constructive algorithms

Integers Shop

data structures, greedy, implementation

Magic Powder - 2

binary search, implementation

Nastya and Strange Generator

brute force, data structures, greedy, implementation

Palindromic Paths

greedy, math

Sagheer and Nubian Market

binary search, sortings

Close Tuples (easy version)

binary search, combinatorics, math, sortings, two pointers

Cellular Network

binary search, implementation, two pointers

Factorials and Powers of Two

bitmasks, brute force, constructive algorithms, dp, math

Beautiful Sets of Points

constructive algorithms, implementation

Min Max Sort

binary search, brute force, greedy, math, two pointers

Secret Passwords

dfs and similar, dsu, graphs

Vasya and Petya's Game

math, number theory

Backspace

dp, greedy, strings, two pointers

Fox And Two Dots

dfs and similar

Boxers

greedy, sortings

Diluc and Kaeya

data structures, dp, hashing, number theory

AquaMoon and Strange Sort

sortings

Minimum Ties

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

NP-Hard Problem

dfs and similar, graphs

Sweets Eating

dp, greedy, math, sortings

They Are Everywhere

binary search, strings, two pointers

Motarack's Birthday

binary search, greedy, ternary search

Air Conditioners

data structures, dp, implementation, shortest paths, sortings, two pointers

Fight with Monsters

greedy, sortings

Lunar New Year and a Wander

data structures, dfs and similar, graphs, greedy, shortest paths

And Matching

bitmasks, constructive algorithms

Power Sequence

brute force, math, number theory, sortings

Yet Another Walking Robot

data structures, implementation

Price Maximization

binary search, greedy, math, two pointers

Cyclic Permutations

combinatorics, dp, graphs, math

Bear and Friendship Condition

dfs and similar, dsu, graphs

Sage's Birthday (hard version)

binary search, brute force, constructive algorithms, greedy, sortings, two pointers

Balanced Bitstring

implementation, strings

Killjoy

greedy, implementation, math

Running for Gold

combinatorics, graphs, greedy, sortings

Eastern Exhibition

binary search, geometry, shortest paths, sortings

Equalize the Array

binary search, data structures, greedy, math, sortings

Non-zero Segments

constructive algorithms, data structures, greedy, sortings

Maximum width

binary search, data structures, dp, greedy, two pointers

K-Complete Word

dfs and similar, dsu, greedy, implementation, strings

Air Conditioner

dp, greedy, implementation, sortings, two pointers

Remove One Element

brute force, dp

Journey

dfs and similar, dp, graphs, probabilities, trees

Binary String Reconstruction

constructive algorithms, dfs and similar, math

Burning Midnight Oil

binary search, implementation

Binary String Reconstruction

2-sat, brute force, constructive algorithms, greedy

Pythagorean Triples

binary search, brute force, math, number theory

Omkar and Baseball

constructive algorithms, math

Binary String To Subsequences

constructive algorithms, data structures, greedy, implementation

Zero Array

greedy, math

AGAGA XOOORRR

bitmasks, brute force, dp, greedy

Vasya and String

binary search, dp, strings, two pointers

Mortal Kombat Tower

dp, graphs, greedy, shortest paths

a-Good String

bitmasks, brute force, divide and conquer, dp, implementation

Interesting Function

binary search, dp, math, number theory

Good String

brute force, dp, greedy, two pointers

Decrease the Sum of Digits

greedy, math

Codeforces Subsequences

brute force, constructive algorithms, greedy, math, strings

Cyclic Components

dfs and similar, dsu, graphs

Special Elements

brute force, implementation, two pointers

Tetrahedron

dp, math, matrices

Potions (Easy Version)

brute force, data structures, dp, greedy

Plus and Multiply

constructive algorithms, math, number theory

Powered Addition

greedy, math

Little Girl and Maximum Sum

data structures, greedy, implementation, sortings

Kefa and Company

binary search, sortings, two pointers

Winner

hashing, implementation

Woodcutters

dp, greedy

Divisibility by Eight

brute force, dp, math

Two Substrings

brute force, dp, greedy, implementation, strings

Kefa and Park

dfs and similar, graphs, trees

Boredom

dp

Binary Notation

*special problem, implementation

Chocolate Bar

*special problem, math