Make k Equal

greedy

Centroids

data structures, dfs and similar, dp, graphs, greedy, trees

Vasya and Beautiful Arrays

brute force, dp, number theory

Bank Hacking

constructive algorithms, data structures, dp, trees

Rectangle Painting 1

dp

Unusual Sequences

bitmasks, combinatorics, dp, math, number theory

Robin Hood

binary search, greedy

Clear Symmetry

constructive algorithms, dp, math

Let's Play the Words?

data structures, hashing, implementation, math

Pavel and barbecue

constructive algorithms, dfs and similar

Single-use Stones

binary search, flows, greedy, two pointers

Array Shuffling

constructive algorithms, graphs, greedy

Doremy's Drying Plan (Easy Version)

brute force, data structures, dp, greedy, sortings

Spanning Tree with One Fixed Degree

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

Perfect Triples

bitmasks, brute force, constructive algorithms, divide and conquer, math

Permutation Game

implementation

Expand the Path

brute force, combinatorics, data structures, implementation, math

My pretty girl Noora

brute force, dp, greedy, math, number theory

Salyg1n and Array (hard version)

constructive algorithms, interactive

Monsters

brute force, data structures, dfs and similar, dsu, graphs, greedy

Ciel and Duel

dp, flows, greedy

Winter Is Coming

dp, greedy, sortings

Blood Cousins Return

binary search, data structures, dfs and similar, dp, sortings

Mysterious strings

*special problem, implementation

Turn Off The TV

data structures, sortings

Closest Equals

*special problem, data structures

New Year's Puzzle

brute force, dp, graph matchings, greedy, sortings

System Administrator

graphs

Send Boxes to Alice (Hard Version)

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

Prime Number

math, number theory

Skyline Photo

data structures, divide and conquer, dp

Nearest Fraction

brute force, implementation, two pointers

Calendar

brute force, implementation

Balls and Boxes

constructive algorithms, greedy, implementation

Delete Them

constructive algorithms, implementation

New Year and Conference

binary search, data structures, hashing, sortings

String Manipulation 1.0

*special problem, binary search, brute force, data structures, strings

Marbles

bitmasks, dp

Credit Card

data structures, dp, greedy, implementation

Secret

constructive algorithms, implementation

Little Artem and Time Machine

data structures

Clothes

brute force

Gluttony

constructive algorithms, greedy

Pasha and Phone

binary search, math

Marathon

implementation, math

Read Time

binary search, greedy, two pointers

Subsequences (hard version)

dp, strings

Help Chef Gerasim

implementation, sortings

Minimax

constructive algorithms, greedy, strings

Paths in a Complete Binary Tree

bitmasks, trees

Extra-terrestrial Intelligence

implementation

Vlad and the Mountains

binary search, data structures, dsu, graphs, implementation, sortings, trees, two pointers

Lucky Queries

data structures

Antimatter

dp

Guess the K-th Zero (Hard version)

binary search, constructive algorithms, data structures, interactive

Intercity Travelling

combinatorics, math, probabilities

Workout plan

data structures, greedy

Kuroni and the Score Distribution

constructive algorithms, greedy, implementation, math

Inna and Huge Candy Matrix

implementation, math

MEX vs MED

math, two pointers

Elimination

dp, implementation, math

Number of Triplets

binary search, brute force

Fibonacci Strings

greedy, implementation, math, number theory

Unusual Entertainment

data structures, dfs and similar, dsu, shortest paths, sortings, trees, two pointers

Buses Between Cities

implementation

Roman Digits

brute force, combinatorics, dp, greedy, math

Vlad and Trouble at MIT

dfs and similar, dp, flows, graphs, greedy, implementation, trees

Into Blocks (easy version)

data structures, dsu, greedy, implementation, two pointers

Tyler and Strings

combinatorics, data structures, implementation

Guest Student

math

Kirk and a Binary String (easy version)

brute force, greedy, strings

World of Darkraft: Battle for Azathoth

brute force, data structures, sortings

Rudolph and Mimic

constructive algorithms, implementation, interactive

Lexicography

constructive algorithms, strings

The Tower is Going Home

binary search, two pointers

Beautiful Subarrays

data structures, divide and conquer, strings, trees

The Parade

binary search, greedy

Pictures with Kittens (hard version)

data structures, dp

Polo the Penguin and Houses

combinatorics

Innokenty and a Football League

2-sat, graphs, greedy, implementation, shortest paths, strings

Little Artem and Dance

brute force, constructive algorithms, implementation

Inna and Pink Pony

greedy, implementation

Wonderful Randomized Sum

greedy

Ravioli Sort

implementation

Solution for Cube

brute force, implementation

Chamber of Secrets

dfs and similar, shortest paths

Moving Both Hands

dp, graphs, shortest paths

Treelabeling

bitmasks, constructive algorithms, dfs and similar, games, greedy, implementation, trees

Increase Sequence

combinatorics, dp

Completely Searching for Inversions

dfs and similar, dp, graphs

Sum Graph

brute force, constructive algorithms, graphs, implementation, interactive, shortest paths, trees

Rectangular Game

number theory

Bitwise Queries (Hard Version)

bitmasks, constructive algorithms, interactive, math

Orchestra

brute force, implementation

Paint the Middle

dp, greedy, sortings, two pointers

Great Vova Wall (Version 2)

data structures, implementation

Traffic Lights

implementation

Square Earth?

dfs and similar, greedy, implementation

Up the hill

constructive algorithms, implementation

Rudolf and Subway

constructive algorithms, dfs and similar, graphs, shortest paths