Pull Your Luck

brute force, greedy, math, number theory

Buying gifts

data structures, greedy, sortings

The Very Beautiful Blanket

bitmasks, constructive algorithms

Unforgivable Curse (hard version)

brute force, constructive algorithms, dfs and similar, dsu, graphs, greedy, strings

Unforgivable Curse (easy version)

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

Double Lexicographically Minimum

greedy, strings

Shocking Arrangement

constructive algorithms, greedy, math

Candy Store

greedy, math, number theory

Li Hua and Chess

constructive algorithms, greedy, interactive

Maximum Set

binary search, math

Triangle Coloring

combinatorics, math

Tea Tasting

binary search, data structures, implementation

Moscow Gorillas

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

Fixed Prefix Permutations

binary search, bitmasks, data structures, hashing, math, sortings

Min Max Sort

binary search, brute force, greedy, math, two pointers

Range Update Point Query

binary search, brute force, data structures

Vlad and a Pair of Numbers

bitmasks, constructive algorithms

Serval and Toxel's Arrays

combinatorics, dp, implementation, math

Remove the Bracket

dp, greedy, math

Yet Another Tournament

binary search, greedy, sortings

Many Perfect Squares

brute force, math, number theory

Equal Frequencies

brute force, constructive algorithms, greedy, implementation, sortings, strings

Bit Guessing Game

binary search, bitmasks, constructive algorithms, interactive

Boris and His Amazing Haircut

constructive algorithms, data structures, dp, dsu, greedy, sortings

Least Prefix Sum

data structures, greedy

Flexible String

bitmasks, brute force, strings

Quiz Master

binary search, math, number theory, sortings, two pointers

Controllers

binary search, math

Train Splitting

constructive algorithms, graphs, greedy

Friendly Spiders

dfs and similar, graphs, math, number theory, shortest paths

Interesting Sequence

bitmasks, math

Same Count One

brute force, constructive algorithms, greedy, implementation, two pointers

Coloring

constructive algorithms, greedy, math

Easy Assembly

greedy, sortings

Permutation Game

games

Absolute Sorting

constructive algorithms, math

Hossam and Trainees

greedy, math, number theory

Hossam and Friends

binary search, constructive algorithms, dp, two pointers

Koxia and Number Theory

brute force, chinese remainder theorem, math, number theory

Игра в Девятку I

*special problem, brute force, dp

Копирование файлов II

*special problem, binary search, brute force, math

Lucky Permutation

constructive algorithms, dfs and similar, graphs, greedy

Playoff

combinatorics, constructive algorithms, dp, greedy, math

Lucky Chains

math, number theory

Number Reduction

greedy

Torus Path

greedy, math

Watch the Videos

binary search, constructive algorithms, two pointers

Doremy's City Construction

graphs, greedy

Binary Strings are Fun

combinatorics, math

Set Construction

constructive algorithms, dfs and similar, graphs, greedy

SlavicG's Favorite Problem

bitmasks, dfs and similar, graphs

Quests

binary search, greedy, sortings

All Possible Digits

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

The Humanoid

brute force, dp, sortings

Make It Round

brute force, number theory

Range = √Sum

binary search, brute force, constructive algorithms, math, two pointers

Almost All Multiples

greedy, number theory

Factorial Divisibility

math, number theory

Make Nonzero Sum (hard version)

constructive algorithms, dp, greedy

Count GCD

combinatorics, math, number theory

Complementary XOR

constructive algorithms, implementation

Number Game

binary search, data structures, games, greedy, implementation

Zero-Sum Prefixes

brute force, data structures, dp, greedy, implementation

Diverse Substrings

brute force, implementation, strings

Divisible Numbers (easy version)

brute force, math, number theory

Problem with Random Tests

brute force, dp, greedy, probabilities

Orray

bitmasks, brute force, greedy, math, sortings

Smaller

constructive algorithms, greedy, strings

Sending a Sequence Over the Network

dp

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

Card Game

combinatorics, constructive algorithms, dp, games

Even Number Addicts

dp, games, greedy, math

Ela and Crickets

constructive algorithms, games, implementation, math

Meta-set

brute force, combinatorics, data structures, hashing, math

Phase Shift

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

Slime Escape

data structures, dp, greedy, two pointers

Zero-One (Easy Version)

constructive algorithms, greedy, math

Balance (Easy version)

brute force, data structures, implementation, number theory

Sheikh (Easy version)

binary search, bitmasks, greedy, two pointers

Valiant's New Map

binary search, brute force, data structures, dp, two pointers

Even Subarrays

bitmasks, brute force, hashing, math, number theory

Meeting on the Line

binary search, geometry, greedy, implementation, math, ternary search

Guess the Cycle Size

interactive, probabilities

Letter Picking

constructive algorithms, dp, games, two pointers

Digital Logarithm

data structures, greedy, sortings

Moving Both Hands

dp, graphs, shortest paths

Hot Black Hot White

constructive algorithms, math

Garage

binary search, geometry, math

Even-Odd XOR

bitmasks, constructive algorithms, greedy

L-shapes

dfs and similar, implementation

Counting Rectangles

brute force, data structures, dp, implementation

Maximum AND

bitmasks, dfs and similar, divide and conquer, greedy, sortings

Min-Max Array Transformation

binary search, greedy, two pointers

Xor-Subsequence (easy version)

bitmasks, brute force, dp, strings, trees, two pointers

Fighting Tournament

binary search, data structures, implementation, two pointers

Burenka and Traditions (easy version)

dp, greedy

Monoblock

combinatorics, data structures, implementation, math

Path Prefixes

binary search, data structures, dfs and similar, trees