Decode

brute force, combinatorics, implementation

Scale

implementation

Squaring

brute force, constructive algorithms, greedy, implementation, math, number theory

Diagonals

brute force, greedy, implementation, math

Diverse Game

constructive algorithms, greedy, implementation

Novice's Mistake

brute force, constructive algorithms, implementation, math, strings

Test of Love

dp, greedy, implementation

Grid Puzzle

bitmasks, brute force, dp, greedy, implementation

Catch the Coin

implementation

Range Minimum Sum

binary search, brute force, data structures, divide and conquer, implementation

Make Majority

greedy, implementation

Split the Multiset

brute force, greedy, implementation, math

Mathematical Problem

brute force, dp, greedy, implementation, math, two pointers

Maximize the Largest Component (Hard Version)

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

Maximize the Largest Component (Easy Version)

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

Manhattan Circle

implementation, math

Creating Words

implementation, strings

Magic Trick II

constructive algorithms, implementation, sortings

''a'' String Problem

brute force, hashing, implementation, math, string suffix structures, strings

Large Addition

implementation, math

Have Your Cake and Eat It Too

binary search, brute force, greedy, implementation

Corner Twist

constructive algorithms, greedy, implementation, math

Beauty of the mountains

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

Collatz Conjecture

brute force, implementation, math, number theory

Soccer

greedy, implementation, math, sortings

Turtle and an Incomplete Sequence

bitmasks, brute force, constructive algorithms, greedy, implementation, math

Permutation of Rows and Columns

constructive algorithms, data structures, greedy, hashing, implementation, math, matrices, sortings

GCD-sequence

greedy, implementation, math, number theory

Manhattan Triangle

binary search, constructive algorithms, data structures, geometry, implementation, two pointers

Guess the Maximum

brute force, greedy, implementation

Computing Machine

brute force, data structures, dp, greedy, implementation

Elections

data structures, greedy, implementation, math

Manhattan Permutations

constructive algorithms, data structures, greedy, implementation, math

Invertible Bracket Sequences

binary search, combinatorics, data structures, divide and conquer, implementation, two pointers

Job Interview

binary search, dp, greedy, implementation, two pointers

Increase/Decrease/Copy

greedy, implementation

Verify Password

implementation, sortings, strings

Chain Queries

binary search, data structures, dfs and similar, implementation, trees

Bazoka and Mocha's Array

brute force, greedy, implementation, sortings

Cutting Game

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

Ingenuity-2

constructive algorithms, greedy, implementation

Symmetric Encoding

implementation, sortings, strings

Maximum GCD Sum Queries

bitmasks, brute force, dp, implementation, number theory

Cat, Fox and Double Maximum

constructive algorithms, greedy, implementation, math, sortings

Chess For Three

brute force, dp, implementation, math

Circle Perimeter

binary search, brute force, dfs and similar, geometry, implementation, math

Binary Cut

dp, greedy, implementation, sortings, strings

Clock and Strings

implementation

Different String

implementation, strings

My First Sorting Problem

implementation, sortings

Playing Quidditch (Hard)

implementation

Playing Quidditch (Medium)

implementation

Playing Quidditch (Easy)

implementation

Balanced Shuffle (Easy)

implementation, sortings

Card Pairing

dp, greedy, hashing, implementation

Minimizing the Sum

dp, implementation

Two Friends

constructive algorithms, implementation, math

Next and Prev

brute force, data structures, implementation

Long Way to be Non-decreasing

binary search, dfs and similar, graphs, implementation, shortest paths, two pointers

Permutation Counting

binary search, greedy, implementation, math, sortings

Rectangle Filling

constructive algorithms, implementation

A BIT of a Construction

bitmasks, constructive algorithms, greedy, implementation

Nene vs. Monsters (Hard Version)

brute force, greedy, implementation, math

Nene vs. Monsters (Easy Version)

brute force, implementation, math

Nene and the Mex Operator

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

GCD on a grid

brute force, dfs and similar, dp, implementation, math, number theory

Long Inversions

brute force, greedy, implementation, sortings

Inhabitant of the Deep Sea

greedy, implementation, math

Progressive Square

constructive algorithms, data structures, implementation, sortings

Chain Reaction

binary search, data structures, dsu, greedy, implementation, math, number theory

Make It Ugly

implementation, math

Help, what does it mean to be "Based"

brute force, constructive algorithms, expression parsing, implementation, sortings

Palindrome

implementation, strings

Are You a Procrastinator?

implementation

No Palindromes

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

Shuffling Songs

bitmasks, dfs and similar, dp, graphs, hashing, implementation, strings

0, 1, 2, Tree!

bitmasks, brute force, greedy, implementation, trees

Nearly Shortest Repeating Substring

brute force, implementation, number theory, strings

Product of Binary Decimals

brute force, dp, implementation, number theory

Clock Conversion

implementation, math

Upscaling

implementation

Stair, Peak, or Neither?

implementation

Amanda the Amoeba

graphs, implementation, trees, two pointers

Clique Partition

brute force, constructive algorithms, graphs, greedy, implementation

Array Fix

brute force, dp, greedy, implementation

Birthday Gift

bitmasks, brute force, constructive algorithms, greedy, implementation

Tree Cutting

binary search, dp, greedy, implementation, trees

Median of an Array

greedy, implementation, sortings

Cook and Porridge

binary search, constructive algorithms, data structures, implementation

Non-Palindromic Substring

hashing, implementation, math, strings

Farmer John's Favorite Function

brute force, data structures, implementation, math

Learning to Paint

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

Rudolf and the Ball Game

dfs and similar, dp, implementation

Three Arrays

*special problem, constructive algorithms, implementation, sortings

Binary Path

dp, greedy, implementation

Shuffle Party

implementation, math

Pokémon Arena

data structures, graphs, greedy, implementation, shortest paths, sortings

Pinball

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

Andrey's Tree

binary search, constructive algorithms, data structures, dfs and similar, dsu, greedy, implementation, trees

Exam in MAC

binary search, combinatorics, implementation, math