Alice and the List of Presents

combinatorics, math

Smaller

constructive algorithms, greedy, strings

Cut 'em all!

dfs and similar, dp, graphs, greedy, trees

Zero Quantity Maximization

hashing, math, number theory

13th Labour of Heracles

data structures, greedy, sortings, trees

Swap Letters

constructive algorithms, greedy

Valera and Tubes

constructive algorithms, dfs and similar, implementation

Random Events

dp, math, probabilities

Nearly Shortest Repeating Substring

brute force, implementation, number theory, strings

Equalizing by Division (easy version)

brute force, implementation

Smilo and Monsters

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

The Morning Star

combinatorics, data structures, geometry, implementation, math, sortings

Phoenix and Socks

greedy, sortings, two pointers

Card Game

brute force, greedy

Quests

binary search, greedy, sortings

Polycarp Restores Permutation

math

Powers of Two

brute force, data structures, implementation, math

Tea Tasting

binary search, data structures, implementation

Greetings

data structures, divide and conquer, sortings

Range Update Point Query

binary search, brute force, data structures

Power of Points

math, sortings

Block Sequence

dp

Pull Your Luck

brute force, greedy, math, number theory

Living Sequence

binary search, dp, math, number theory

Cow and Message

brute force, dp, math, strings

Tenzing and Balls

dp

Coloring

constructive algorithms, greedy, math

ABBC or BACB

constructive algorithms, greedy

Kolya and Tanya

combinatorics

Prefix-Suffix Palindrome (Easy version)

hashing, string suffix structures, strings

Acacius and String

brute force, implementation, strings

Palindrome Basis

brute force, dp, math, number theory

Jury Meeting

combinatorics, math

k-Amazing Numbers

binary search, data structures, implementation, two pointers

Binary String Minimizing

greedy

Data Structures Fan

binary search, bitmasks, data structures, dp

Anu Has a Function

brute force, greedy, math

Vladik and fractions

brute force, constructive algorithms, math, number theory

Edgy Trees

dfs and similar, dsu, graphs, math, trees

Sum on Subarrays

constructive algorithms, greedy, math

Representative Edges

brute force, geometry, implementation, math

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

Did We Get Everything Covered?

constructive algorithms, dp, greedy, shortest paths, 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

Dubious Cyrpto

binary search, brute force, math, number theory

Division

brute force, math, number theory

Painting Eggs

greedy, math

Restoring the Permutation

constructive algorithms, implementation

Knight Tournament

data structures, dsu

Friends and Gifts

constructive algorithms, data structures, math

Ehab and Path-etic MEXs

constructive algorithms, dfs and similar, greedy, trees

Interesting Story

greedy, sortings, strings

A and B

greedy, math

Rings

constructive algorithms, math

Cellular Network

binary search, implementation, two pointers

Magic Powder - 2

binary search, implementation

Even Picture

constructive algorithms

Sagheer and Nubian Market

binary search, sortings

Factorials and Powers of Two

bitmasks, brute force, constructive algorithms, dp, math

Integers Shop

data structures, greedy, implementation

Min Max Sort

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

Palindromic Paths

greedy, math

Vasya and Petya's Game

math, number theory

Nastya and Strange Generator

brute force, data structures, greedy, implementation

Close Tuples (easy version)

binary search, combinatorics, math, sortings, two pointers

Secret Passwords

dfs and similar, dsu, graphs

Beautiful Sets of Points

constructive algorithms, implementation

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

They Are Everywhere

binary search, strings, two pointers

Minimum Ties

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

NP-Hard Problem

dfs and similar, graphs

Air Conditioners

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

Sweets Eating

dp, greedy, math, sortings

Motarack's Birthday

binary search, greedy, ternary search

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