Parliament of Berland

*special problem, constructive algorithms

Lefthanders and Righthanders

implementation

Paths and Trees

graphs, greedy, shortest paths

Ralph And His Magic Field

combinatorics, constructive algorithms, math, number theory

Mysterious Crime

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

Jury Marks

brute force, constructive algorithms

Undoubtedly Lucky Numbers

bitmasks, brute force, dfs and similar

Strange Device

constructive algorithms, interactive, math, sortings

Maximum Xor Secondary

data structures, implementation, two pointers

You Are Given a Decimal String...

brute force, dp, shortest paths

Graph and String

constructive algorithms, graphs

Progress Bar

implementation, math

Cheap Dinner

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

Success Rate

binary search, math

Thematic Contests

greedy, sortings

Vanya and Triangles

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

Shaass and Bookshelf

dp, greedy

Multi-judge Solving

greedy, implementation

The Intriguing Obsession

combinatorics, dp, math

Treasure Hunt

greedy

Directed Roads

combinatorics, dfs and similar, graphs, math

Keyboard

implementation

Gift Set

binary search, greedy, math, ternary search

Mysterious numbers - 1

*special problem, constructive algorithms

Masha and geometric depression

brute force, implementation, math

Survey in Class

brute force, data structures, greedy, implementation, sortings

The Strongest Build

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

Checkout Assistant

dp

Trivial Conjecture

*special problem, constructive algorithms, math, number theory

Igor and his way to work

dfs and similar, graphs, implementation, shortest paths

Spongebob and Joke

implementation

Petya and Exam

implementation, strings

Shift and Reverse

greedy, sortings

Robot Collisions

data structures, greedy, implementation, sortings

Efim and Strange Grade

dp, implementation, math

Save Energy!

binary search, implementation, math

Dreamoon and Sets

constructive algorithms, greedy, math

Rectangles

geometry, implementation, sortings

Mahmoud and a Message

brute force, dp, greedy, strings

LuoTianyi and the Floating Islands (Easy Version)

combinatorics, math, probabilities, trees

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

Two Paths

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

Block Towers

brute force, greedy, math, number theory

Sereja and Algorithm

data structures, implementation

Mind the Gap

implementation

Marco and GCD Sequence

constructive algorithms, math

Passable Paths (hard version)

data structures, dfs and similar, trees

Binary Median

binary search, bitmasks, brute force, constructive algorithms

Jumping Jack

math

Nastia and a Hidden Permutation

constructive algorithms, interactive

Guess Your Way Out!

implementation, math, trees

Subsequences of Length Two

dp, strings

Send the Fool Further! (easy)

dfs and similar, graphs, trees

Weakness and Poorness

ternary search

Iterated Linear Function

math, number theory

Timetable

dp

Guess The String

binary search, constructive algorithms, interactive

Sasha and One More Name

constructive algorithms, hashing, strings

Empty Graph

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

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

Inconvenient Pairs

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

Danil and a Part-time Job

bitmasks, data structures, trees

Pairs

binary search, constructive algorithms, greedy, two pointers

Candies Distribution

constructive algorithms, implementation

Robot Vacuum Cleaner

greedy, sortings

Colliders

math, number theory

Optimal Subsequences (Hard Version)

data structures, greedy

Line

math, number theory

Orac and Game of Life

dfs and similar, graphs, implementation, shortest paths

Lucky Mask

brute force, implementation

Finding Zero

constructive algorithms, interactive, math

Depression

geometry, math

Count Pairs

math, matrices, number theory, two pointers

Blocking Elements

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

Another Sorting Problem

data structures, sortings, strings

Restore the Permutation

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

Lorry

greedy, sortings

New Year Snowmen

binary search, data structures, greedy

Petya's Exams

greedy, implementation, sortings

Nearest Beautiful Number (hard version)

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

View Angle

brute force, geometry, math

Taxi drivers and Lyft

implementation, sortings

Bitwise Queries (Easy Version)

bitmasks, constructive algorithms, interactive, math

Divide by Three

dp, greedy, math, number theory

Trash Problem

data structures, implementation

XOR Inverse

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

Constellation

geometry, implementation

Searchlights

binary search, brute force, data structures, dp, implementation, sortings, two pointers

Different Arrays

brute force, dp, implementation

Curriculum Vitae

brute force, implementation

Wish I Knew How to Sort

dp, math, probabilities

Perfect Security

data structures, greedy, strings, trees

Organizing SWERC

brute force, implementation

Robbers' watch

brute force, combinatorics, dp, math