Array and Segments (Easy version)

brute force, greedy, implementation

Divisibility

math

Anya and Ghosts

constructive algorithms, greedy

Remove Extra One

brute force, data structures, math

Send Boxes to Alice (Easy Version)

constructive algorithms, greedy, math, number theory, ternary search, two pointers

Checkout Assistant

dp

Expression Evaluation Error

constructive algorithms, greedy, implementation, math

Bouncing Boomerangs

constructive algorithms, greedy, implementation

GCD Counting

data structures, dfs and similar, dp, number theory, trees

pSort

dfs and similar, dsu, graphs

Moving to the Capital

dfs and similar, dp, graphs, shortest paths

Imbalanced Array

data structures, divide and conquer, dsu, sortings

Strange Device

constructive algorithms, interactive, math, sortings

AB Graph

brute force, constructive algorithms, graphs, greedy, implementation

Paths and Trees

graphs, greedy, shortest paths

Farewell Party

constructive algorithms, implementation

Numbers on Tree

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

Sereja and Contests

greedy, implementation, math

Beautiful Lyrics

data structures, greedy, strings

You Are Given a Decimal String...

brute force, dp, shortest paths

Parliament of Berland

*special problem, constructive algorithms

Lefthanders and Righthanders

implementation

Ralph And His Magic Field

combinatorics, constructive algorithms, math, number theory

Undoubtedly Lucky Numbers

bitmasks, brute force, dfs and similar

Jury Marks

brute force, constructive algorithms

Maximum Xor Secondary

data structures, implementation, two pointers

Mysterious Crime

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

Cheap Dinner

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

Shaass and Bookshelf

dp, greedy

Shift and Reverse

greedy, sortings

The Intriguing Obsession

combinatorics, dp, math

Progress Bar

implementation, math

Gift Set

binary search, greedy, math, ternary search

Multi-judge Solving

greedy, implementation

Graph and String

constructive algorithms, graphs

Keyboard

implementation

Success Rate

binary search, math

Vanya and Triangles

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

The Strongest Build

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

Thematic Contests

greedy, sortings

Directed Roads

combinatorics, dfs and similar, graphs, math

Mysterious numbers - 1

*special problem, constructive algorithms

Treasure Hunt

greedy

Survey in Class

brute force, data structures, greedy, implementation, sortings

Masha and geometric depression

brute force, implementation, math

Igor and his way to work

dfs and similar, graphs, implementation, shortest paths

Trivial Conjecture

*special problem, constructive algorithms, math, number theory

Robot Collisions

data structures, greedy, implementation, sortings

Spongebob and Joke

implementation

Petya and Exam

implementation, strings

LuoTianyi and the Floating Islands (Easy Version)

combinatorics, math, probabilities, trees

Efim and Strange Grade

dp, implementation, math

Jumping Jack

math

Dreamoon and Sets

constructive algorithms, greedy, math

Rectangles

geometry, implementation, sortings

Save Energy!

binary search, implementation, math

Mahmoud and a Message

brute force, dp, greedy, strings

Passable Paths (hard version)

data structures, dfs and similar, trees

Two Paths

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

Swaps Again

constructive algorithms, implementation, sortings

Messages

math

Poster

greedy, implementation

Identify the Operations

combinatorics, data structures, dsu, greedy, implementation

Tolik and His Uncle

constructive algorithms

Block Towers

brute force, greedy, math, number theory

Binary Median

binary search, bitmasks, brute force, constructive algorithms

Sereja and Algorithm

data structures, implementation

Marco and GCD Sequence

constructive algorithms, math

Mind the Gap

implementation

Nastia and a Hidden Permutation

constructive algorithms, interactive

Send the Fool Further! (easy)

dfs and similar, graphs, trees

Guess Your Way Out!

implementation, math, trees

Iterated Linear Function

math, number theory

Weakness and Poorness

ternary search

Subsequences of Length Two

dp, strings

Sasha and One More Name

constructive algorithms, hashing, strings

Empty Graph

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

Timetable

dp

Guess The String

binary search, constructive algorithms, interactive

Madoka and The Corruption Scheme

combinatorics, constructive algorithms, greedy, math

Inconvenient Pairs

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

Chloe and pleasant prizes

dfs and similar, dp, graphs, trees

Palindrome pairs

*special problem, brute force, dp, strings

Danil and a Part-time Job

bitmasks, data structures, trees

Pairs

binary search, constructive algorithms, greedy, two pointers

Robot Vacuum Cleaner

greedy, sortings

Blocking Elements

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

Line

math, number theory

Colliders

math, number theory

Candies Distribution

constructive algorithms, implementation

Optimal Subsequences (Hard Version)

data structures, greedy

Finding Zero

constructive algorithms, interactive, math

Lucky Mask

brute force, implementation

Orac and Game of Life

dfs and similar, graphs, implementation, shortest paths

Another Sorting Problem

data structures, sortings, strings

Depression

geometry, math

Restore the Permutation

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

Count Pairs

math, matrices, number theory, two pointers

Lorry

greedy, sortings

New Year Snowmen

binary search, data structures, greedy