Many Perfect Squares

brute force, math, number theory

1D Sokoban

binary search, dp, greedy, implementation, two pointers

Omkar and the Meaning of Life

constructive algorithms, greedy, interactive

XOR-pyramid

dp

Chessboard

bitmasks, brute force, implementation

Seating On Bus

implementation

Flamingoes of Mystery

interactive

Berserk Monsters

brute force, data structures, dsu, implementation, math

Milking cows

data structures, greedy

The Fair Nut and the Best Path

data structures, dp, trees

Running Student

brute force, geometry, implementation

Chilly Willy

math, number theory

K Balanced Teams

dp, sortings, two pointers

Mike and Cellphone

brute force, constructive algorithms, implementation

Annoying Present

greedy, math

Magic Formulas

math

New Year Tree

bitmasks, data structures, trees

Zebras

greedy

Finding Team Member

brute force, implementation, sortings

Need for Pink Slips

bitmasks, brute force, dfs and similar, implementation, math, probabilities

Fox And Jumping

bitmasks, brute force, dp, math

Controllers

binary search, math

XOR-gun

bitmasks, brute force, constructive algorithms

Permutation Graph

binary search, constructive algorithms, data structures, divide and conquer, greedy, shortest paths

Little Xor

brute force, implementation

Trains

implementation, math

Cram Time

greedy

Ones and Twos

binary search, data structures, divide and conquer, math, two pointers

Bad Luck Island

dp, probabilities

African Crossword

implementation, strings

Cut and Paste

implementation, math

Hide and Seek

graphs

Arpa's weak amphitheater and Mehrdad's valuable Hoses

dfs and similar, dp, dsu

Tournament

bitmasks, brute force, dfs and similar, greedy

Phone Numbers

implementation, strings

Sorting the Coins

dsu, implementation, sortings, two pointers

Hopscotch

geometry, math

Necklace Assembly

brute force, dfs and similar, dp, graphs, greedy, number theory

Civilization

dfs and similar, dp, dsu, ternary search, trees

Recover it!

dfs and similar, graphs, greedy, number theory, sortings

Internet Address

implementation, strings

Rudolf and Imbalance

binary search, greedy, sortings, two pointers

Police Stations

constructive algorithms, dfs and similar, dp, graphs, shortest paths, trees

Ksusha the Squirrel

brute force, implementation

Square Subsets

bitmasks, combinatorics, dp, math

After Training

data structures, implementation, math

Anadi and Domino

brute force, graphs

Useful Decomposition

implementation, trees

"Or" Game

brute force, greedy

Yet Another Subarray Problem

dp, greedy, math

Laurenty and Shop

implementation

Madoka and the Best School in Russia

constructive algorithms, dp, math, number theory

The Doctor Meets Vader (Easy)

binary search, sortings

Number of Subsequences

combinatorics, dp, strings

Semifinals

implementation, sortings

Passable Paths (easy version)

dfs and similar, trees

Dominant Indices

data structures, dsu, trees

Food on the Plane

implementation, math

Maxim and Discounts

greedy, sortings

Minimizing the Sum

dp, implementation

Crazy Diamond

constructive algorithms, sortings

Mister B and Angle in Polygon

constructive algorithms, geometry, math

Array Repetition

binary search, brute force, dsu, implementation, math

Unusual Matrix

2-sat, brute force, constructive algorithms

You're Given a String...

brute force, greedy

Rocket

binary search, interactive

Sagheer, the Hausmeister

bitmasks, brute force, dp

Three-level Laser

binary search, greedy, two pointers

Aerodynamic

geometry

Maximum And Queries (easy version)

binary search, bitmasks, brute force, greedy

Bash and a Tough Math Puzzle

data structures, number theory

Buy a Ticket

data structures, graphs, shortest paths

GCD and MST

constructive algorithms, dsu, graphs, greedy, number theory, sortings

Meeting

implementation

Indivisibility

math, number theory

From Y to Y

constructive algorithms

Little Elephant and Cards

binary search, data structures

Clear the Multiset

data structures, divide and conquer, dp, greedy

Hashing Trees

constructive algorithms, trees

The Contest

implementation

Vlad and Unfinished Business

dfs and similar, dp, greedy, trees

Burenka and Traditions (hard version)

data structures, dp, greedy

Primes or Palindromes?

brute force, implementation, math, number theory

Design Tutorial: Inverse the Problem

dfs and similar, dsu, shortest paths, trees

Restore Graph

dfs and similar, graphs, sortings

Crazy Robot

dfs and similar, graphs

Feeding Chicken

constructive algorithms, greedy, implementation

Chip Move

brute force, dp, math

Magic Odd Square

constructive algorithms, math

Green and Black Tea

constructive algorithms, greedy, math

Jamie and Interesting Graph

constructive algorithms, graphs, shortest paths

Erase and Extend (Hard Version)

binary search, data structures, greedy, hashing, string suffix structures, strings, two pointers

Recommendations

data structures, greedy, sortings

Generate a String

dfs and similar, dp

Omsk Metro (simple version)

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

Complete Tripartite

brute force, constructive algorithms, graphs, hashing, implementation

Primal Sport

math, number theory

Tree XOR

bitmasks, dfs and similar, dp, greedy, trees

The Robot

brute force, implementation

Longtail Hedgehog

dp, graphs