Robot Factory

bitmasks, dfs and similar

Array Game

games, greedy, two pointers

Training Session

combinatorics, data structures, geometry, implementation, math

Rubik's Cube Coloring (easy version)

combinatorics, math

The Number of Imposters

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

Gardener and Tree

brute force, data structures, dfs and similar, greedy, implementation, trees

Half of Same

brute force, math, number theory

Bakry and Partitioning

bitmasks, constructive algorithms, dfs and similar, dp, graphs, trees

Yet Another Sorting Problem

data structures, math

Minimize Distance

greedy

Omkar and the Meaning of Life

constructive algorithms, greedy, interactive

Omkar and Determination

data structures, dp

Korney Korneevich and XOR (easy version)

bitmasks, dp, greedy

Vupsen, Pupsen and 0

constructive algorithms, math

Portal

brute force, data structures, dp, greedy, implementation

Array Stabilization (AND version)

brute force, graphs, math, number theory, shortest paths

Array Optimization by Deque

data structures, greedy

Productive Meeting

constructive algorithms, graphs, greedy

Ticks

greedy, implementation

Higher Order Functions

implementation, strings

Jeopardy of Dropped Balls

binary search, brute force, dsu, implementation

Divisible by Twenty-Five

brute force, dfs and similar, dp

Slay the Dragon

binary search, greedy, sortings, ternary search

Swaps

greedy, math, sortings

Book

binary search, brute force, data structures, dp, graphs, implementation, sortings

Fix the String

*special problem, bitmasks, dp, greedy

Sweepstake

*special problem, brute force, constructive algorithms, implementation, math

Rhyme

*special problem, implementation

Epic Novel

*special problem, math

Inconvenient Pairs

binary search, data structures, implementation, sortings, two pointers

Jury Meeting

combinatorics, math

Carrying Conundrum

bitmasks, combinatorics, dp, math

Seating Arrangements (hard version)

data structures, greedy, implementation, sortings, two pointers

Two Hundred Twenty One (easy version)

data structures, dp, math

Rings

constructive algorithms, math

Up the Strip (simplified version)

brute force, data structures, dp, math, number theory

Deep Down Below

binary search, greedy, sortings

Nearest Beautiful Number (easy version)

binary search, bitmasks, brute force, constructive algorithms, dfs and similar, greedy

Polycarp and String Transformation

binary search, implementation, sortings, strings

Make a Power of Two

greedy, math, strings

Mocha and Diana (Easy Version)

brute force, constructive algorithms, dsu, graphs, greedy, trees

Up the Strip

brute force, dp, math, number theory, two pointers

Charmed by the Game

brute force, math

Moamen and XOR

bitmasks, combinatorics, dp, math, matrices

Take a Guess

bitmasks, constructive algorithms, interactive, math

Compressed Bracket Sequence

brute force, implementation

Take Your Places!

implementation

Say No to Palindromes

brute force, constructive algorithms, dp, strings

Coin Rows

brute force, constructive algorithms, dp, implementation

Two Tables

brute force

Diane

constructive algorithms, greedy, strings

Mikasa

binary search, bitmasks, greedy, implementation

Cobb

bitmasks, brute force, greedy, math

Backspace

dp, greedy, strings, two pointers

Reverse String

brute force, dp, hashing, implementation, strings

Array Differentiation

bitmasks, brute force, constructive algorithms, dfs and similar, dp, graphs, math

Maximize the Intersections

combinatorics, constructive algorithms, geometry, greedy, sortings

Running for Gold

combinatorics, graphs, greedy, sortings

Domino (easy version)

constructive algorithms, math

Interesting Story

greedy, sortings, strings

Wonderful Coloring - 2

binary search, constructive algorithms, data structures, greedy

Manhattan Subarrays

brute force, geometry, greedy, implementation

Integers Have Friends

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

Web of Lies

brute force, graphs, greedy

Array Stabilization (GCD version)

binary search, brute force, data structures, divide and conquer, number theory, two pointers

Air Conditioners

data structures, dp, implementation, shortest paths, sortings, two pointers

Co-growing Sequence

bitmasks, constructive algorithms, greedy

AquaMoon and Chess

combinatorics, math

AquaMoon and Strange Sort

sortings

RPD and Rap Sheet (Easy Version)

bitmasks, constructive algorithms, interactive, math

Need for Pink Slips

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

Strange Function

math, number theory

Plus and Multiply

constructive algorithms, math, number theory

Great Graphs

constructive algorithms, graphs, greedy, shortest paths, sortings

PriceFixed

binary search, greedy, implementation, sortings, two pointers

Interesting Function

binary search, dp, math, number theory

Another Problem About Dividing Numbers

constructive algorithms, math, number theory

Number of Pairs

binary search, data structures, math, two pointers

Erase and Extend (Easy Version)

binary search, brute force, dp, greedy, hashing, implementation, string suffix structures, strings, two pointers

Deleting Divisors

games, math, number theory

Diluc and Kaeya

data structures, dp, hashing, number theory

Playoff Tournament

data structures, dfs and similar, dp, implementation, trees

Unstable String

binary search, dp, greedy, implementation, strings, two pointers

Lost Tree

constructive algorithms, interactive, trees

Little Alawn's Puzzle

combinatorics, dp, dsu, graphs, math

Secret Santa

constructive algorithms, flows, graphs, greedy, math

Kavi on Pairing Duty

combinatorics, dp, math

Parsa's Humongous Tree

dfs and similar, divide and conquer, dp, greedy, trees

Sequence Pair Weight

hashing, implementation, math

Palindrome Game (hard version)

constructive algorithms, games

Potions (Hard Version)

data structures, greedy

Potions (Easy Version)

brute force, data structures, dp, greedy

I Hate 1111

dp, math, number theory

Armchairs

dp, flows, graph matchings, greedy

Compression and Expansion

brute force, data structures, greedy, implementation, trees

Nastia and a Good Array

constructive algorithms, math, number theory

Guess the K-th Zero (Easy version)

binary search, interactive

Arranging The Sheep

greedy, math

Maximum Sum of Products

brute force, dp, implementation, math, two pointers

Berland Regional

brute force, data structures, greedy, number theory, sortings