Exact Change

brute force, constructive algorithms, greedy

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

Number With The Given Amount Of Divisors

brute force, dp, number theory

Replace With Product

brute force, greedy, math

Zero-One (Hard Version)

dp, greedy

Garland

dfs and similar, graphs, greedy, trees

Roman and Numbers

bitmasks, brute force, combinatorics, dp, number theory

Masha-forgetful

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

Two Sets

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

Sequence Sorting

dp, greedy, two pointers

Maximum Subarray

data structures, dp, greedy, two pointers

Yet Another Division Into Teams

dp, greedy, sortings

Shuffle

combinatorics, math, two pointers

Babaei and Birthday Cake

data structures, dp

Hanoi Factory

brute force, data structures, dp, greedy, sortings

Placing Jinas

combinatorics, math

Time to Run

constructive algorithms, graphs, implementation

Multipliers

math, number theory

Balanced Playlist

binary search, data structures, implementation

Repetitions Decoding

constructive algorithms, implementation, sortings

Moving Dots

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

Small GCD

bitmasks, brute force, dp, math, number theory

GCD Guess

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

Fixed Points

binary search, brute force, dp

Case of Fugitive

data structures, greedy, sortings

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

Weight the Tree

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

Edge Split

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

Guess the Permutation

binary search, combinatorics, interactive, math

Salyg1n and Array (simple version)

constructive algorithms, interactive, math

DZY Loves Modification

brute force, data structures, greedy

Cyclic MEX

data structures, implementation, math, two pointers

Cashback

data structures, dp, greedy, math

Ilya And The Tree

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

Decreasing Debts

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

Matching vs Independent Set

constructive algorithms, graphs, greedy, sortings

Glass Half Spilled

dp

A Growing Tree

data structures, dfs and similar, trees

Unshuffling a Deck

constructive algorithms, implementation

Strip

binary search, data structures, dp, two pointers

Let's Play Osu!

dp, math, probabilities

Lucky Common Subsequence

dp, strings

Messenger Simulator

data structures

Non-Palindromic Substring

hashing, implementation, math, strings

Mahmoud and a Dictionary

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

Counting Arrays

combinatorics, dp, math, number theory

Looking for Order

bitmasks, dp

Count the Trains

binary search, data structures, greedy, sortings

Vitya and Strange Lesson

binary search, data structures

Nash Matrix

constructive algorithms, dfs and similar, graphs, implementation

Kamil and Making a Stream

math, number theory, trees

Count Paths

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

Interacdive Problem

binary search, constructive algorithms, interactive

Nene and the Mex Operator

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

Circular Spanning Tree

constructive algorithms, implementation, trees

Game with modulo

binary search, constructive algorithms, interactive

Linguistics

greedy, implementation, sortings, strings

Gourmet choice

dfs and similar, dp, dsu, graphs, greedy

Thanos Nim

games

Bottom-Tier Reversals

constructive algorithms, greedy

Shortest Path

graphs, shortest paths

Pillars

binary search, data structures, dp, sortings, trees

Triangular Paths

constructive algorithms, graphs, math, shortest paths, sortings

Fox and Card Game

games, greedy, sortings

Captain Marmot

brute force, geometry

Equalizing Two Strings

constructive algorithms, sortings, strings

Doremy's Drying Plan (Easy Version)

brute force, data structures, dp, greedy, sortings

No Palindromes

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

Coprime Subsequences

bitmasks, combinatorics, number theory

Unusual Sequences

bitmasks, combinatorics, dp, math, number theory

Sergey and Subway

dfs and similar, dp, trees

Vasya and Good Sequences

bitmasks, dp

Array Shuffling

constructive algorithms, graphs, greedy

Robin Hood

binary search, greedy

Turn Off The TV

data structures, sortings

Closest Equals

*special problem, data structures

Rudolf and Subway

constructive algorithms, dfs and similar, graphs, shortest paths

Vlad and the Mountains

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

Little Artem and Time Machine

data structures

Gluttony

constructive algorithms, greedy

World of Darkraft: Battle for Azathoth

brute force, data structures, sortings

MEX vs MED

math, two pointers

Intercity Travelling

combinatorics, math, probabilities

Fibonacci Strings

greedy, implementation, math, number theory

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

Sum Graph

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

Inna and Pink Pony

greedy, implementation

Dima and Bacteria

dsu, graphs, shortest paths

Lynyrd Skynyrd

data structures, dfs and similar, dp, math, trees

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