Distance to the Path

data structures, dfs and similar, trees

Cactus Wall

constructive algorithms, dfs and similar, graphs, shortest paths

Counting Arrays

combinatorics, dp, math, number theory

Number Game

binary search, data structures, games, greedy, implementation

Death's Blessing

greedy

Cowardly Rooks

greedy, implementation

Circular Xor Reversal

bitmasks, constructive algorithms

Yet Another Array Counting Problem

binary search, data structures, divide and conquer, dp, flows, math, trees

ConstructOR

bitmasks, chinese remainder theorem, combinatorics, constructive algorithms, math, number theory

Zero-Sum Prefixes

brute force, data structures, dp, greedy, implementation

Diverse Substrings

brute force, implementation, strings

The Ultimate Square

math

List Generation

combinatorics, dp, math

Yet Another Problem

binary search, bitmasks, constructive algorithms, data structures

Swap Game

games

BAN BAN

constructive algorithms

Two Groups

constructive algorithms, greedy

Olympiad Training

binary search, data structures, dp, flows, geometry, implementation, sortings

Kazaee

data structures, hashing, probabilities

Joking (Hard Version)

dp, interactive

Joking (Easy Version)

binary search, constructive algorithms, interactive, ternary search

Paths on the Tree

dfs and similar, dp, greedy, sortings, trees

Permutation Operations

constructive algorithms, greedy, implementation, math

Rebellion

constructive algorithms, greedy, two pointers

Maxmina

constructive algorithms, greedy

MEX vs MED

math, two pointers

Divisible Numbers (hard version)

brute force, math, number theory

Divisible Numbers (easy version)

brute force, math, number theory

Divisibility by 2^n

greedy, math, sortings

Traffic Light

binary search, implementation, two pointers

Even-Odd Increments

implementation, math

Number Replacement

greedy, implementation

Antifibonacci Cut

bitmasks, combinatorics, constructive algorithms, data structures, dp, hashing, math

Intersection and Union

data structures, dp, matrices, probabilities

FTL

binary search, dp

Problem with Random Tests

brute force, dp, greedy, probabilities

Save the Magazines

constructive algorithms, dp, greedy

Permutation Value

constructive algorithms, greedy

Password

brute force, combinatorics, implementation, math

Orray

bitmasks, brute force, greedy, math, sortings

Smaller

constructive algorithms, greedy, strings

Scuza

binary search, greedy, math

Coprime

brute force, greedy, number theory

Stripes

implementation

Increasing

greedy, implementation, sortings

Sum

implementation

Kirill and Company

bitmasks, brute force, dfs and similar, dp, flows, graphs, shortest paths

Multi-Colored Segments

binary search, data structures, math, sortings

Sending a Sequence Over the Network

dp

Masha and a Beautiful Tree

dfs and similar, divide and conquer, graphs, sortings, trees

Minimize the Thickness

brute force, greedy, math, two pointers

Funny Permutation

constructive algorithms, math

Compare T-Shirt Sizes

implementation, implementation, strings

Arranging Crystal Balls

data structures, divide and conquer, divide and conquer, dp, geometry, graphs, number theory

MEX Tree Manipulation

data structures, trees

Dangerous Laser Power

constructive algorithms, dsu, sortings

Conditional Mix

combinatorics, dp, math

Hanging Hearts

constructive algorithms, data structures, dfs and similar, dp, greedy, trees

Knowledge Cards

constructive algorithms, data structures

Bricks and Bags

constructive algorithms, games, greedy, sortings

Jumbo Extra Cheese 2

geometry, greedy, sortings

Factorise N+M

constructive algorithms, number theory

Keyboard Design

bitmasks, data structures, dp, string suffix structures, strings

Cleaning Robot

bitmasks, dp

Reset K Edges

binary search, data structures, dfs and similar, graphs, greedy, trees

Card Game

combinatorics, constructive algorithms, dp, games

Array Recovery

constructive algorithms, greedy, math

Immobile Knight

implementation

Palindrome Addicts

data structures, strings

Anti-Increasing Addicts

constructive algorithms, dp, greedy, math

Connectivity Addicts

constructive algorithms, dsu, graphs, greedy, interactive, shortest paths, trees

Balance Addicts

combinatorics, dp, math, two pointers

Permutation Addicts

constructive algorithms, data structures, dfs and similar, dsu, graphs, trees

Even Number Addicts

dp, games, greedy, math

Prefix Sum Addicts

constructive algorithms, greedy, math, sortings

Glory Addicts

greedy, implementation, sortings

Ela Takes Dancing Class

binary search, data structures

Ela and Prime GCD

constructive algorithms, math, number theory

Ela Goes Hiking

combinatorics, dp, math, probabilities

Ela and the Wiring Wizard

brute force, dp, graphs, greedy, implementation, shortest paths

Ela and Crickets

constructive algorithms, games, implementation, math

Ela's Fitness and the Luxury Number

binary search, implementation, math

Ela Sorting Books

greedy, implementation, strings

Swap and Take

dp, greedy

Equal Binary Subsequences

constructive algorithms, geometry, greedy, implementation, strings

Good Subarrays (Hard Version)

binary search, data structures, dp, two pointers

Good Subarrays (Easy Version)

binary search, data structures, schedules, two pointers

Playing with GCD

math, number theory

Make A Equal to B

brute force, greedy, sortings

Pebbles and Beads

data structures, geometry

House Planning

constructive algorithms, data structures, graph matchings, greedy

Meta-set

brute force, combinatorics, data structures, hashing, math

Phase Shift

dfs and similar, dsu, graphs, greedy, implementation, strings

Tea with Tangerines

greedy, math

Working Week

constructive algorithms, greedy, math

Zeros and Ones

bitmasks, divide and conquer, dp, math

Rectangular Congruence

constructive algorithms, number theory

Slime Escape

data structures, dp, greedy, two pointers

Removing Smallest Multiples

greedy, math

Bright, Nice, Brilliant

constructive algorithms