Even Positions

constructive algorithms, data structures, greedy

Make Three Regions

constructive algorithms, two pointers

Squaring

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

Fortnite

combinatorics, constructive algorithms, games, greedy, hashing, interactive, math, number theory, strings

Stardew Valley

constructive algorithms, dfs and similar, graphs, trees

Funny Game

constructive algorithms, dsu, graphs, greedy, math, number theory, trees

Fun Game

bitmasks, constructive algorithms, greedy, math

Diverse Game

constructive algorithms, greedy, implementation

Dyn-scripted Robot (Easy Version)

brute force, chinese remainder theorem, constructive algorithms, math, number theory

Parity and Sum

constructive algorithms, greedy

Novice's Mistake

brute force, constructive algorithms, implementation, math, strings

Gorilla and Permutation

constructive algorithms, math

Only Pluses

brute force, constructive algorithms, greedy, math, sortings

Grid Game

constructive algorithms, games, graph matchings, greedy, interactive

Grid Reset

constructive algorithms, greedy, implementation

Coloring Game

constructive algorithms, dfs and similar, games, graphs, greedy, interactive

Prime XOR Coloring

bitmasks, constructive algorithms, graphs, greedy, math, number theory

Absolute Zero

constructive algorithms, greedy, math

AND Reconstruction

bitmasks, constructive algorithms, greedy

Array Craft

constructive algorithms, greedy

Increasing Sequence with Fixed OR

bitmasks, constructive algorithms, greedy

Magic Trick II

constructive algorithms, implementation, sortings

Strange Splitting

constructive algorithms

Swap Dilemma

constructive algorithms, data structures, divide and conquer, greedy, math, sortings

Corner Twist

constructive algorithms, greedy, implementation, math

Array Divisibility

constructive algorithms, math

Turtle and Multiplication

constructive algorithms, dfs and similar, graphs, number theory

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

Sofia and the Lost Operations

constructive algorithms, greedy

Kostyanych's Theorem

brute force, constructive algorithms, graphs, interactive

Manhattan Triangle

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

Fixing a Binary String

bitmasks, brute force, constructive algorithms, dp, greedy, hashing, strings

Earning on Bets

binary search, combinatorics, constructive algorithms, number theory

Manhattan Permutations

constructive algorithms, data structures, greedy, implementation, math

Alice and Books

constructive algorithms, greedy, sortings

Tensor

constructive algorithms, graphs, interactive

Binary Colouring

bitmasks, constructive algorithms, greedy, math

Ingenuity-2

constructive algorithms, greedy, implementation

Cat, Fox and Double Maximum

constructive algorithms, greedy, implementation, math, sortings

Arithmancy (Medium)

constructive algorithms, interactive, probabilities, strings

Arithmancy (Easy)

brute force, constructive algorithms, interactive, strings

Exact Neighbours (Hard)

constructive algorithms

Exact Neighbours (Medium)

constructive algorithms

Exact Neighbours (Easy)

constructive algorithms

Balanced Unshuffle (Hard)

constructive algorithms, trees

Balanced Unshuffle (Medium)

brute force, constructive algorithms, trees

Shifts and Sorting

constructive algorithms, greedy

Two Friends

constructive algorithms, implementation, math

Cells Arrangement

constructive algorithms

Assembly via Remainders

constructive algorithms, number theory

Rectangle Filling

constructive algorithms, implementation

Card Exchange

constructive algorithms, games, greedy

Connected Cubes

constructive algorithms, games

Missing Subarray Sum

constructive algorithms

Folding Strip

constructive algorithms, greedy, strings

Missing Subsequence Sum

bitmasks, constructive algorithms, greedy, number theory

Yet Another Permutation Constructive

*special problem, constructive algorithms

A BIT of a Construction

bitmasks, constructive algorithms, greedy, implementation

Stickogon

constructive algorithms, greedy

Nene and the Passing Game

constructive algorithms, data structures, dsu, graphs, sortings

Nene and the Mex Operator

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

Nene's Magical Matrix

constructive algorithms, greedy, math

The Most Reckless Defense

bitmasks, brute force, constructive algorithms, dp, flows, graph matchings, shortest paths

Progressive Square

constructive algorithms, data structures, implementation, sortings

Painting the Ribbon

constructive algorithms, greedy, math

Help, what does it mean to be "Based"

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

Growing Trees

binary search, constructive algorithms, flows, graphs, greedy

Inversion Composition

constructive algorithms, data structures, greedy

No Palindromes

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

Buying Jewels

constructive algorithms, greedy, math

Dual Trigger

constructive algorithms, greedy, math

Make Triangle

constructive algorithms, math

Funny or Scary?

constructive algorithms

Clique Partition

brute force, constructive algorithms, graphs, greedy, implementation

Arrow Path

brute force, constructive algorithms, dfs and similar, dp, graphs, shortest paths

Special Characters

brute force, constructive algorithms

Birthday Gift

bitmasks, brute force, constructive algorithms, greedy, implementation

Cook and Porridge

binary search, constructive algorithms, data structures, implementation

Binary Search

binary search, constructive algorithms, greedy

Equal XOR

bitmasks, constructive algorithms

Tree Compass

constructive algorithms, dfs and similar, greedy, trees

Bessie and MEX

constructive algorithms, math

Farmer John's Challenge

constructive algorithms, math

Rudolf and Subway

constructive algorithms, dfs and similar, graphs, shortest paths

Almost Certainly

*special problem, constructive algorithms, data structures, sortings

Three Arrays

*special problem, constructive algorithms, implementation, sortings

Parallel Universes

*special problem, constructive algorithms, dfs and similar, dsu, graphs

Evidence Board

*special problem, constructive algorithms, dfs and similar, graphs, trees

Draw Polygon Lines

*special problem, constructive algorithms, dp, geometry, interactive

Bitwise Operation Wizard

bitmasks, constructive algorithms, greedy, interactive, math

Andrey's Tree

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

Messenger in MAC

binary search, brute force, constructive algorithms, data structures, dp, greedy, sortings

Informatics in MAC

constructive algorithms

Entertainment in MAC

constructive algorithms, strings

Weird LCM Operations

brute force, constructive algorithms, number theory

XOR Break --- Solo Version

bitmasks, constructive algorithms, greedy

Find a Mine

binary search, constructive algorithms, geometry, greedy, interactive, math

Turtle Magic: Royal Turtle Shell Pattern

bitmasks, brute force, combinatorics, constructive algorithms, dfs and similar, math

Turtle Tenacity: Continual Mods

constructive algorithms, greedy, math, number theory, sortings