Reverse

bitmasks, constructive algorithms, dfs and similar, implementation, math, strings

Buds Re-hanging

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

Robot in a Hallway

data structures, dp, greedy, implementation, ternary search

Increasing Frequency

binary search, dp, greedy

Number With The Given Amount Of Divisors

brute force, dp, number theory

Zero-One (Hard Version)

dp, greedy

Roman and Numbers

bitmasks, brute force, combinatorics, dp, number theory

Garland

dfs and similar, graphs, greedy, trees

Replace With Product

brute force, greedy, math

Masha-forgetful

brute force, constructive algorithms, dp, hashing, implementation, strings

Sequence Sorting

dp, greedy, two pointers

Shuffle

combinatorics, math, two pointers

Yet Another Division Into Teams

dp, greedy, sortings

Maximum Subarray

data structures, dp, greedy, two pointers

Babaei and Birthday Cake

data structures, dp

Hanoi Factory

brute force, data structures, dp, greedy, sortings

Placing Jinas

combinatorics, math

Two Sets

2-sat, dfs and similar, dsu, graph matchings, greedy

Multipliers

math, number theory

Balanced Playlist

binary search, data structures, implementation

Time to Run

constructive algorithms, graphs, implementation

Repetitions Decoding

constructive algorithms, implementation, sortings

Moving Dots

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

Case of Fugitive

data structures, greedy, sortings

GCD Guess

bitmasks, chinese remainder theorem, constructive algorithms, games, interactive, math, number theory

Fixed Points

binary search, brute force, dp

Small GCD

bitmasks, brute force, dp, math, number theory

Koxia and Game

constructive algorithms, data structures, dfs and similar, dsu, flows, games, graph matchings, graphs, implementation

Range Sorting (Easy Version)

binary search, dp, dsu, greedy, trees, two pointers

Equation

math

Moving Chips

bitmasks, dp, greedy

Pchelyonok and Segments

binary search, data structures, dp, greedy, math

Edge Split

brute force, constructive algorithms, dfs and similar, dsu, graphs, probabilities, trees

Weight the Tree

constructive algorithms, dfs and similar, dp, implementation, trees

Guess the Permutation

binary search, combinatorics, interactive, math

DZY Loves Modification

brute force, data structures, greedy

Salyg1n and Array (simple version)

constructive algorithms, interactive, math

Cyclic MEX

data structures, implementation, math, two pointers

Ilya And The Tree

dfs and similar, graphs, math, number theory, trees

Decreasing Debts

constructive algorithms, data structures, graphs, greedy, implementation, math, two pointers

Cashback

data structures, dp, greedy, math

Glass Half Spilled

dp

Unshuffling a Deck

constructive algorithms, implementation

A Growing Tree

data structures, dfs and similar, trees

Strip

binary search, data structures, dp, two pointers

Let's Play Osu!

dp, math, probabilities

Lucky Common Subsequence

dp, strings

Messenger Simulator

data structures

Mahmoud and a Dictionary

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

Counting Arrays

combinatorics, dp, math, number theory

Matching vs Independent Set

constructive algorithms, graphs, greedy, sortings

Looking for Order

bitmasks, dp

Count the Trains

binary search, data structures, greedy, sortings

Vitya and Strange Lesson

binary search, data structures

Kamil and Making a Stream

math, number theory, trees

Nash Matrix

constructive algorithms, dfs and similar, graphs, implementation

Interacdive Problem

binary search, constructive algorithms, interactive

Game with modulo

binary search, constructive algorithms, interactive

Circular Spanning Tree

constructive algorithms, implementation, trees

Linguistics

greedy, implementation, sortings, strings

Non-Palindromic Substring

hashing, implementation, math, strings

Bottom-Tier Reversals

constructive algorithms, greedy

Count Paths

data structures, dfs and similar, dp, dsu, graphs, trees

Shortest Path

graphs, shortest paths

Triangular Paths

constructive algorithms, graphs, math, shortest paths, sortings

Pillars

binary search, data structures, dp, sortings, trees

Thanos Nim

games

Fox and Card Game

games, greedy, sortings

Captain Marmot

brute force, geometry

Equalizing Two Strings

constructive algorithms, sortings, strings

Gourmet choice

dfs and similar, dp, dsu, graphs, greedy

Doremy's Drying Plan (Easy Version)

brute force, data structures, dp, greedy, sortings

Coprime Subsequences

bitmasks, combinatorics, number theory

Sergey and Subway

dfs and similar, dp, trees

Unusual Sequences

bitmasks, combinatorics, dp, math, number theory

Vasya and Good Sequences

bitmasks, dp

Robin Hood

binary search, greedy

Array Shuffling

constructive algorithms, graphs, greedy

Turn Off The TV

data structures, sortings

Closest Equals

*special problem, data structures

Little Artem and Time Machine

data structures

Vlad and the Mountains

binary search, data structures, dsu, graphs, implementation, sortings, trees, two pointers

Nene and the Mex Operator

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

Gluttony

constructive algorithms, greedy

World of Darkraft: Battle for Azathoth

brute force, data structures, sortings

Intercity Travelling

combinatorics, math, probabilities

No Palindromes

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

Fibonacci Strings

greedy, implementation, math, number theory

MEX vs MED

math, two pointers

Rudolf and Subway

constructive algorithms, dfs and similar, graphs, shortest paths

Into Blocks (easy version)

data structures, dsu, greedy, implementation, two pointers

Roman Digits

brute force, combinatorics, dp, greedy, math

Kirk and a Binary String (easy version)

brute force, greedy, strings

Inna and Pink Pony

greedy, implementation

Sum Graph

brute force, constructive algorithms, graphs, implementation, interactive, shortest paths, trees

Dima and Bacteria

dsu, graphs, shortest paths

Drazil and Tiles

constructive algorithms, greedy

Ehab and another another xor problem

bitmasks, constructive algorithms, implementation, interactive

Segments Removal

data structures, dsu, flows, implementation, two pointers

Famil Door and Brackets

dp, strings