Too Many Impostors (easy version)

constructive algorithms, implementation, interactive

Qualification Rounds

bitmasks, brute force, constructive algorithms, dp

Yet Another Problem

binary search, bitmasks, constructive algorithms, data structures

Squares and not squares

constructive algorithms, greedy

K-beautiful Strings

binary search, brute force, constructive algorithms, greedy, strings

Vasya And The Matrix

constructive algorithms, flows, math

Send Boxes to Alice (Easy Version)

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

Bouncing Boomerangs

constructive algorithms, greedy, implementation

Anya and Ghosts

constructive algorithms, greedy

Expression Evaluation Error

constructive algorithms, greedy, implementation, math

AB Graph

brute force, constructive algorithms, graphs, greedy, implementation

Parliament of Berland

*special problem, constructive algorithms

Strange Device

constructive algorithms, interactive, math, sortings

Numbers on Tree

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

Farewell Party

constructive algorithms, implementation

Ralph And His Magic Field

combinatorics, constructive algorithms, math, number theory

Jury Marks

brute force, constructive algorithms

Graph and String

constructive algorithms, graphs

Mysterious numbers - 1

*special problem, constructive algorithms

Trivial Conjecture

*special problem, constructive algorithms, math, number theory

Dreamoon and Sets

constructive algorithms, greedy, math

Swaps Again

constructive algorithms, implementation, sortings

Tolik and His Uncle

constructive algorithms

Binary Median

binary search, bitmasks, brute force, constructive algorithms

Marco and GCD Sequence

constructive algorithms, math

Guess The String

binary search, constructive algorithms, interactive

Nastia and a Hidden Permutation

constructive algorithms, interactive

Empty Graph

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

Sasha and One More Name

constructive algorithms, hashing, strings

Madoka and The Corruption Scheme

combinatorics, constructive algorithms, greedy, math

Pairs

binary search, constructive algorithms, greedy, two pointers

Restore the Permutation

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

Finding Zero

constructive algorithms, interactive, math

Candies Distribution

constructive algorithms, implementation

Nearest Beautiful Number (hard version)

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

Bitwise Queries (Easy Version)

bitmasks, constructive algorithms, interactive, math

Imbalanced Arrays

constructive algorithms, graphs, greedy, math, sortings, two pointers

Save the problem!

constructive algorithms

Polyline

constructive algorithms, implementation

Balanced Removals (Harder)

binary search, constructive algorithms, divide and conquer, greedy, implementation, sortings

Archaeology

brute force, constructive algorithms, greedy, strings

Hanging Hearts

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

Checkpoints

brute force, constructive algorithms, greedy, math, probabilities

Huge Boxes of Animal Toys

constructive algorithms

Obsession with Robots

constructive algorithms, graphs, implementation

Birthday Gift

bitmasks, brute force, constructive algorithms, greedy, implementation

Powerful Ksenia

bitmasks, constructive algorithms, math

Hexagons

brute force, constructive algorithms, greedy, implementation, math, shortest paths

Big Brush

constructive algorithms, data structures, greedy, implementation

Reverse

bitmasks, constructive algorithms, dfs and similar, implementation, math, strings

Yet Another Ball Problem

constructive algorithms, implementation

Exact Change

brute force, constructive algorithms, greedy

Maximum Number

*special problem, constructive algorithms, greedy, implementation

Buds Re-hanging

constructive algorithms, dfs and similar, dp, greedy, trees

Ehab's Last Corollary

constructive algorithms, dfs and similar, graphs, greedy, implementation, trees

The Closest Pair

constructive algorithms, implementation

The Winter Hike

constructive algorithms, greedy, math

Permutation Cycle

brute force, constructive algorithms

Two Arrays

binary search, brute force, combinatorics, constructive algorithms, dp, two pointers

Masha-forgetful

brute force, constructive algorithms, dp, hashing, implementation, strings

Football

constructive algorithms

Present

binary search, bitmasks, constructive algorithms, data structures, math, sortings

Not a Geometry Problem

*special problem, *special problem, constructive algorithms, geometry, math

Array Restoration

constructive algorithms, data structures

Mahmoud and Ehab and the xor

constructive algorithms

Dasha and Very Difficult Problem

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

Watch the Videos

binary search, constructive algorithms, two pointers

Tenzing and His Animal Friends

constructive algorithms, graphs, greedy

Painting the Array II

constructive algorithms, data structures, dp, greedy, implementation

Alice, Bob, Two Teams

brute force, constructive algorithms

Xor-MST

bitmasks, constructive algorithms, data structures

Playing Piano

constructive algorithms, dp

Reverse Sort Sum

constructive algorithms, data structures, greedy, implementation, math, two pointers

Fish Graph

brute force, constructive algorithms, dfs and similar, graphs

Subsequence Counting

bitmasks, constructive algorithms, greedy, implementation

Find Color

constructive algorithms, geometry, implementation, math

Cutting Figure

constructive algorithms, graphs, trees

Set To Max (Hard Version)

constructive algorithms, data structures, divide and conquer, greedy, implementation, sortings

Almost Sorted

binary search, combinatorics, constructive algorithms, implementation

Destroying Roads

constructive algorithms, graphs, shortest paths

Unfair Poll

binary search, constructive algorithms, implementation, math

Time to Run

constructive algorithms, graphs, implementation

Magic Stones

constructive algorithms, math, sortings

Devu and Partitioning of the Array

brute force, constructive algorithms, implementation, number theory

Home Numbers

*special problem, constructive algorithms, math

Graph And Its Complement

constructive algorithms, graphs, implementation

ZgukistringZ

brute force, constructive algorithms, implementation, strings

Repetitions Decoding

constructive algorithms, implementation, sortings

GCD Guess

bitmasks, chinese remainder theorem, constructive algorithms, games, interactive, math, number theory

A Mist of Florescence

constructive algorithms, graphs

Challenges in school №41

brute force, constructive algorithms, games, graphs, greedy, implementation, sortings

Tram

constructive algorithms, implementation, math

Koxia and Game

constructive algorithms, data structures, dfs and similar, dsu, flows, games, graph matchings, graphs, implementation

Unique Palindromes

constructive algorithms, math, strings

Chemical table

constructive algorithms, dfs and similar, dsu, graphs, matrices

Connected Component on a Chessboard

constructive algorithms, implementation

A Leapfrog in the Array

constructive algorithms, math

Sea Battle

constructive algorithms, greedy, math

N Problems During K Days

constructive algorithms, greedy, math

01 Tree

constructive algorithms, data structures, dsu, greedy, sortings, trees