Cat, Fox and the Lonely Array

binary search, bitmasks, data structures, greedy, math, two pointers

Permutation Game

brute force, dfs and similar, games, graphs, greedy, math

Inhabitant of the Deep Sea

greedy, implementation, math

Arrow Path

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

Seraphim the Owl

dp, greedy

MEX Game 1

games, greedy

Bessie's Birthday Cake (Easy Version)

geometry, greedy, math

Binary Path

dp, greedy, implementation

Divisible Pairs

combinatorics, math, number theory

Find the Different Ones!

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

Vlad and Division

bitmasks, greedy

Closest Cities

greedy, implementation, math

Romantic Glasses

data structures, greedy, math

Game with Multiset

binary search, bitmasks, brute force, greedy

Insert and Equalize

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

Anji's Binary Tree

dfs and similar, dp, trees

Queue Sort

greedy, implementation, sortings

Yarik and Musical Notes

hashing, math, number theory

Qingshan Loves Strings 2

constructive algorithms, greedy, implementation

Sets and Union

bitmasks, brute force, constructive algorithms, greedy

Divide and Equalize

math, number theory

Make it Alternating

combinatorics, dp, greedy

Money Trees

binary search, greedy, math, two pointers

Colorful Table

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

Fill in the Matrix

constructive algorithms, implementation

Salyg1n and the MEX Game

constructive algorithms, data structures, games, greedy, interactive

Divisor Chain

bitmasks, constructive algorithms, math, number theory

Ice Cream Balls

binary search, combinatorics, constructive algorithms, math

Strong Vertices

math, sortings, trees

Prefix Permutation Sums

implementation, math

We Were Both Children

brute force, implementation, math, number theory

Rudolf and Snowflakes (simple version)

brute force, implementation, math

Particles

dp, greedy, implementation, math

Insert Zero and Invert Prefix

constructive algorithms

Forever Winter

dfs and similar, graphs, math

Dreaming of Freedom

greedy, math, number theory

Strongly Composite

greedy, math, number theory

Tear It Apart

brute force, implementation, math, strings

Constructive Problem

brute force, greedy

Ian and Array Sorting

greedy, math

Make It Permutation

brute force, greedy, sortings

Interview

binary search, implementation, interactive

Scoring Subsequences

binary search, greedy, math, two pointers

Matching Numbers

constructive algorithms, greedy, math

Cake Assembly Line

brute force, sortings

The Forbidden Permutation

greedy, math

Beppa and SwerChat

two pointers

Gardener and the Array

bitmasks, constructive algorithms

Ice and Fire

constructive algorithms, dp, greedy

Подкрутка II

*special problem, dp

Elemental Decompress

constructive algorithms, greedy, implementation, sortings

Hamiltonian Wall

dp, implementation

Make Nonzero Sum (easy version)

constructive algorithms, dp, greedy

Permutation Operations

constructive algorithms, greedy, implementation, math

Masha and a Beautiful Tree

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

Ela's Fitness and the Luxury Number

binary search, implementation, math

Good Subarrays (Easy Version)

binary search, data structures, schedules, two pointers

Parity Shuffle Sorting

constructive algorithms, sortings

Jatayu's Balanced Bracket Sequence

data structures, dsu, graphs, greedy

Madoka and Formal Statement

greedy

Party

brute force, graphs

Yet Another Problem About Pairs Satisfying an Inequality

binary search, data structures, dp, greedy, sortings

3SUM Closure

brute force, data structures

Directional Increase

greedy

3SUM

brute force, math

White-Black Balanced Subtrees

dfs and similar, dp, graphs, trees

Longest Strike

data structures, greedy, implementation, sortings, two pointers

Vertical Paths

graphs, implementation, trees

Maximal AND

bitmasks, greedy, math

Make it Increasing

brute force, greedy, math

Getting Zero

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

Get an Even String

dp, greedy, strings

Bit Flipping

bitmasks, constructive algorithms, greedy, strings

Twist the Permutation

brute force, constructive algorithms, implementation, math

Game of Ball Passing

greedy, implementation

Madoka and Childish Pranks

constructive algorithms, greedy

Inversion Graph

data structures, dsu, graphs, math

Not Sitting

games, greedy, sortings

Array and Operations

dp, greedy, math

Paprika and Permutation

binary search, greedy, math, sortings

And It's Non-Zero

bitmasks, greedy, math

Chat Ban

binary search, math

Blue-Red Permutation

greedy, math, sortings

Di-visible Confusion

constructive algorithms, math, number theory

Array Elimination

bitmasks, greedy, math, number theory

Rubik's Cube Coloring (easy version)

combinatorics, math

Minimize Distance

greedy

Slay the Dragon

binary search, greedy, sortings, ternary search

Epic Novel

*special problem, math

Deep Down Below

binary search, greedy, sortings

Make a Power of Two

greedy, math, strings

Charmed by the Game

brute force, math

Take Your Places!

implementation

Coin Rows

brute force, constructive algorithms, dp, implementation

Two Tables

brute force

Reverse String

brute force, dp, hashing, implementation, strings

Co-growing Sequence

bitmasks, constructive algorithms, greedy

Number of Pairs

binary search, data structures, math, two pointers

Little Alawn's Puzzle

combinatorics, dp, dsu, graphs, math

Nastia and a Good Array

constructive algorithms, math, number theory