Elections

greedy

Exposition

binary search, data structures, dsu, trees, two pointers

Minimal Labels

data structures, dfs and similar, graphs, greedy

Doremy's Drying Plan (Easy Version)

brute force, data structures, dp, greedy, sortings

Coprime Subsequences

bitmasks, combinatorics, number theory

Flying Sort (Easy Version)

dp, greedy, two pointers

Tennis Game

binary search

Labyrinth

dfs and similar, graphs

Centroids

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

Sergey and Subway

dfs and similar, dp, trees

Kirk and a Binary String (hard version)

data structures, greedy, math, strings

Unusual Sequences

bitmasks, combinatorics, dp, math, number theory

Vasya and Beautiful Arrays

brute force, dp, number theory

Vasya and Good Sequences

bitmasks, dp

Robin Hood

binary search, greedy

Salyg1n and Array (hard version)

constructive algorithms, interactive

Make k Equal

greedy

Rectangle Painting 1

dp

Bank Hacking

constructive algorithms, data structures, dp, trees

Array Shuffling

constructive algorithms, graphs, greedy

Let's Play the Words?

data structures, hashing, implementation, math

Clear Symmetry

constructive algorithms, dp, math

Expand the Path

brute force, combinatorics, data structures, implementation, math

Perfect Triples

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

Monsters

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

Single-use Stones

binary search, flows, greedy, two pointers

Permutation Game

implementation

Pavel and barbecue

constructive algorithms, dfs and similar

My pretty girl Noora

brute force, dp, greedy, math, number theory

Ciel and Duel

dp, flows, greedy

Winter Is Coming

dp, greedy, sortings

Blood Cousins Return

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

Turn Off The TV

data structures, sortings

Closest Equals

*special problem, data structures

Mysterious strings

*special problem, implementation

New Year's Puzzle

brute force, dp, graph matchings, greedy, sortings

Prime Number

math, number theory

System Administrator

graphs

Skyline Photo

data structures, divide and conquer, dp

Send Boxes to Alice (Hard Version)

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

Nearest Fraction

brute force, implementation, two pointers

Balls and Boxes

constructive algorithms, greedy, implementation

Calendar

brute force, implementation

Delete Them

constructive algorithms, implementation

Credit Card

data structures, dp, greedy, implementation

String Manipulation 1.0

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

New Year and Conference

binary search, data structures, hashing, sortings

Nene and the Mex Operator

bitmasks, brute force, constructive algorithms, divide and conquer, dp, greedy, implementation, math

Marbles

bitmasks, dp

Vlad and the Mountains

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

Kuroni and the Score Distribution

constructive algorithms, greedy, implementation, math

Little Artem and Time Machine

data structures

Secret

constructive algorithms, implementation

Subsequences (hard version)

dp, strings

Paths in a Complete Binary Tree

bitmasks, trees

Gluttony

constructive algorithms, greedy

Clothes

brute force

Read Time

binary search, greedy, two pointers

Vlad and Trouble at MIT

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

Pasha and Phone

binary search, math

Marathon

implementation, math

Lucky Queries

data structures

Help Chef Gerasim

implementation, sortings

World of Darkraft: Battle for Azathoth

brute force, data structures, sortings

Unusual Entertainment

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

Minimax

constructive algorithms, greedy, strings

Extra-terrestrial Intelligence

implementation

Guess the K-th Zero (Hard version)

binary search, constructive algorithms, data structures, interactive

Antimatter

dp

Intercity Travelling

combinatorics, math, probabilities

Number of Triplets

binary search, brute force

No Palindromes

brute force, constructive algorithms, divide and conquer, greedy, hashing, implementation, math, strings

Workout plan

data structures, greedy

Fibonacci Strings

greedy, implementation, math, number theory

Inna and Huge Candy Matrix

implementation, math

MEX vs MED

math, two pointers

Elimination

dp, implementation, math

Rudolf and Subway

constructive algorithms, dfs and similar, graphs, shortest paths

Pictures with Kittens (hard version)

data structures, dp

Rudolph and Mimic

constructive algorithms, implementation, interactive

Into Blocks (easy version)

data structures, dsu, greedy, implementation, two pointers

Buses Between Cities

implementation

Tyler and Strings

combinatorics, data structures, implementation

Roman Digits

brute force, combinatorics, dp, greedy, math

Beautiful Subarrays

data structures, divide and conquer, strings, trees

Guest Student

math

Kirk and a Binary String (easy version)

brute force, greedy, strings

Lexicography

constructive algorithms, strings

Chamber of Secrets

dfs and similar, shortest paths

The Parade

binary search, greedy

The Tower is Going Home

binary search, two pointers

Polo the Penguin and Houses

combinatorics

Wonderful Randomized Sum

greedy

Moving Both Hands

dp, graphs, shortest paths

How Many Paths?

dfs and similar, dp, graphs, trees

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

Ravioli Sort

implementation

Treelabeling

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