Constellation

geometry, implementation

Different Arrays

brute force, dp, implementation

Trash Problem

data structures, implementation

XOR Inverse

bitmasks, data structures, divide and conquer, dp, greedy, math, sortings, strings, trees

Taxi drivers and Lyft

implementation, sortings

View Angle

brute force, geometry, math

Bitwise Queries (Easy Version)

bitmasks, constructive algorithms, interactive, math

Nearest Beautiful Number (hard version)

bitmasks, brute force, constructive algorithms, dfs and similar, dp, greedy

Divide by Three

dp, greedy, math, number theory

Petya's Exams

greedy, implementation, sortings

New Year Snowmen

binary search, data structures, greedy

Lorry

greedy, sortings

Count Pairs

math, matrices, number theory, two pointers

Restore the Permutation

binary search, constructive algorithms, data structures, greedy, math

Another Sorting Problem

data structures, sortings, strings

Depression

geometry, math

Orac and Game of Life

dfs and similar, graphs, implementation, shortest paths

Finding Zero

constructive algorithms, interactive, math

Lucky Mask

brute force, implementation

Optimal Subsequences (Hard Version)

data structures, greedy

Candies Distribution

constructive algorithms, implementation

Colliders

math, number theory

Line

math, number theory

Robot Vacuum Cleaner

greedy, sortings

Pairs

binary search, constructive algorithms, greedy, two pointers

Blocking Elements

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

Danil and a Part-time Job

bitmasks, data structures, trees

Palindrome pairs

*special problem, brute force, dp, strings

Chloe and pleasant prizes

dfs and similar, dp, graphs, trees

Madoka and The Corruption Scheme

combinatorics, constructive algorithms, greedy, math

Guess The String

binary search, constructive algorithms, interactive

Empty Graph

binary search, constructive algorithms, data structures, greedy, shortest paths

Inconvenient Pairs

binary search, data structures, implementation, sortings, two pointers

Sasha and One More Name

constructive algorithms, hashing, strings

Timetable

dp

Subsequences of Length Two

dp, strings

Weakness and Poorness

ternary search

Iterated Linear Function

math, number theory

Send the Fool Further! (easy)

dfs and similar, graphs, trees

Nastia and a Hidden Permutation

constructive algorithms, interactive

Guess Your Way Out!

implementation, math, trees

Mind the Gap

implementation

Marco and GCD Sequence

constructive algorithms, math

Binary Median

binary search, bitmasks, brute force, constructive algorithms

Sereja and Algorithm

data structures, implementation

Block Towers

brute force, greedy, math, number theory

Tolik and His Uncle

constructive algorithms

Identify the Operations

combinatorics, data structures, dsu, greedy, implementation

Poster

greedy, implementation

Messages

math

Swaps Again

constructive algorithms, implementation, sortings

Two Paths

dfs and similar, dp, graphs, shortest paths, trees, two pointers

Passable Paths (hard version)

data structures, dfs and similar, trees

Save Energy!

binary search, implementation, math

Mahmoud and a Message

brute force, dp, greedy, strings

Rectangles

geometry, implementation, sortings

Dreamoon and Sets

constructive algorithms, greedy, math

Efim and Strange Grade

dp, implementation, math

Jumping Jack

math

LuoTianyi and the Floating Islands (Easy Version)

combinatorics, math, probabilities, trees

Petya and Exam

implementation, strings

Spongebob and Joke

implementation

Robot Collisions

data structures, greedy, implementation, sortings

Trivial Conjecture

*special problem, constructive algorithms, math, number theory

Igor and his way to work

dfs and similar, graphs, implementation, shortest paths

Masha and geometric depression

brute force, implementation, math

Survey in Class

brute force, data structures, greedy, implementation, sortings

Treasure Hunt

greedy

Mysterious numbers - 1

*special problem, constructive algorithms

Directed Roads

combinatorics, dfs and similar, graphs, math

The Strongest Build

binary search, brute force, data structures, dfs and similar, graphs, greedy, hashing, implementation

Thematic Contests

greedy, sortings

Vanya and Triangles

brute force, combinatorics, data structures, geometry, math, sortings

Multi-judge Solving

greedy, implementation

Graph and String

constructive algorithms, graphs

Gift Set

binary search, greedy, math, ternary search

Keyboard

implementation

The Intriguing Obsession

combinatorics, dp, math

Progress Bar

implementation, math

Success Rate

binary search, math

Shift and Reverse

greedy, sortings

Cheap Dinner

brute force, data structures, graphs, greedy, implementation, sortings, two pointers

Shaass and Bookshelf

dp, greedy

Mysterious Crime

brute force, combinatorics, math, meet-in-the-middle, two pointers

Maximum Xor Secondary

data structures, implementation, two pointers

Jury Marks

brute force, constructive algorithms

Undoubtedly Lucky Numbers

bitmasks, brute force, dfs and similar

Ralph And His Magic Field

combinatorics, constructive algorithms, math, number theory

Parliament of Berland

*special problem, constructive algorithms

Lefthanders and Righthanders

implementation

Beautiful Lyrics

data structures, greedy, strings

Sereja and Contests

greedy, implementation, math

Numbers on Tree

constructive algorithms, data structures, dfs and similar, graphs, greedy, trees

Farewell Party

constructive algorithms, implementation

Paths and Trees

graphs, greedy, shortest paths

AB Graph

brute force, constructive algorithms, graphs, greedy, implementation

Strange Device

constructive algorithms, interactive, math, sortings

Imbalanced Array

data structures, divide and conquer, dsu, sortings

Moving to the Capital

dfs and similar, dp, graphs, shortest paths

You Are Given a Decimal String...

brute force, dp, shortest paths