Array and Segments (Hard version)

data structures, implementation

Array and Segments (Easy version)

brute force, greedy, implementation

Diverse Garland

constructive algorithms, dp, greedy

Nice Garland

brute force, greedy, math

Divisors of Two Integers

brute force, greedy, math, number theory

Two distinct points

implementation

Vasya and Maximum Profit

binary search, constructive algorithms, data structures, dp, dsu

Vasya and Endless Credits

dp, flows, graph matchings, graphs, sortings

Vasya and Binary String

dp

Compression

dp, implementation, math, number theory

Brutality

greedy, sortings, two pointers

Digital root

math, number theory

Digits Sequence Dividing

greedy, strings

Lunar New Year and a Recursive Sequence

math, matrices, number theory

Lunar New Year and Red Envelopes

data structures, dp

Lunar New Year and a Wander

data structures, dfs and similar, graphs, greedy, shortest paths

Lunar New Year and Number Division

greedy, implementation, math, sortings

Lunar New Year and Food Ordering

data structures, implementation

Lunar New Year and Cross Counting

implementation

Helping Hiasat

bitmasks, brute force, dp, meet-in-the-middle

Kilani and the Game

dfs and similar, graphs, implementation, shortest paths

Ayoub and Lost Array

combinatorics, dp, math

Zuhair and Strings

brute force, implementation, strings

Salem and Sticks

brute force, implementation

Game with string

data structures, implementation, math

Splitting into digits

constructive algorithms, implementation, math

Radix sum

fft, math, number theory

Professional layer

bitmasks, dp

Johnny Solving

constructive algorithms, dfs and similar, graphs, math

Game with modulo

binary search, constructive algorithms, interactive

Grid game

constructive algorithms, implementation

Elongated Matrix

binary search, bitmasks, brute force, dp, graphs

Monotonic Renumeration

combinatorics, sortings

Balanced Ternary String

greedy, strings

Doors Breaking and Repairing

games

Array K-Coloring

greedy, sortings

Integer Sequence Dividing

math

(Zero XOR Subset)-less

math, matrices

Trucks and Cities

binary search, dp

Polycarp's New Job

implementation

GCD Counting

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

Division and Union

sortings

Accordion

greedy, implementation

Minimum Integer

math

Ivan and Burgers

data structures, divide and conquer, greedy, math

Andrew and Taxi

binary search, dfs and similar, graphs

Dasha and Chess

constructive algorithms, games, interactive

NN and the Optical Illusion

binary search, geometry, math

Build a Contest

data structures, implementation

Roman and Browser

implementation

Cookies

binary search, data structures, dfs and similar, dp, games, trees

Postcard

constructive algorithms, implementation

Squares and Segments

binary search, constructive algorithms, math

Snowball

implementation

Ж-function

string suffix structures, strings

Fedya the Potter

binary search, implementation, math, number theory

Eels

data structures

Construct a tree

binary search, constructive algorithms, dfs and similar, graphs, greedy, trees

Nice table

brute force, constructive algorithms, greedy, math

Sum in the tree

constructive algorithms, dfs and similar, greedy, trees

Mateusz and an Infinite Sequence

bitmasks, brute force, dp, strings

Vladislav and a Great Legend

combinatorics, dp, trees

Alex and a TV Show

bitmasks, combinatorics, number theory

Egor and an RPG game

constructive algorithms, greedy

Makoto and a Blackboard

dp, math, number theory, probabilities

Yuhao and a Parenthesis

greedy, implementation

Petr and a Combination Lock

bitmasks, brute force, dp

Gennady and a Card Game

brute force, implementation

Lucky Tickets

divide and conquer, dp, fft

Inversion Expectation

dp, math, probabilities

The Top Scorer

combinatorics, dp, math, probabilities

Easy Problem

dp

Polygon for the Angle

brute force, geometry

Substring Removal

combinatorics, math, strings

Find Divisible

greedy, implementation, math

Make It Connected

dsu, graphs, greedy

Almost Regular Bracket Sequence

implementation

Circular Dance

implementation

Powers Of Two

bitmasks, greedy

Array Stabilization

implementation

Repeating Cipher

implementation

Multidimensional Queries

bitmasks, data structures

Vasya and Array

dp

Intersection of Permutations

data structures

Beautiful Graph

dfs and similar, graphs

Mishka and the Last Exam

greedy

Letters Rearranging

constructive algorithms, greedy, sortings, strings

Dice Rolling

math

Tree with Maximum Cost

dfs and similar, dp, trees

Minimal Diameter Forest

constructive algorithms, dfs and similar, greedy, trees

Great Vova Wall (Version 2)

data structures, implementation

Great Vova Wall (Version 1)

greedy, implementation, math

Prefixes and Suffixes

strings

Teams Forming

sortings

Uniform String

implementation

New Year and the Tricolore Recreation

games

New Year and the Factorisation Collaboration

interactive, math, number theory

New Year and the Mallard Expedition

constructive algorithms, greedy

New Year and the Acquaintance Estimation

binary search, data structures, graphs, greedy, implementation, math, sortings

New Year and the Permutation Concatenation

combinatorics, dp, math