Minimization

dp, greedy, sortings

Cycle

dfs and similar, graphs

Gadgets for dollars and pounds

binary search, greedy, two pointers

Fibonacci-ish

brute force, dp, hashing, implementation, math

Obsessive String

dp, strings

Not Quite Lee

combinatorics, dp, math, number theory

Special Permutations

math

The Great Equalizer

binary search, data structures, math, sortings

Doremy's Pegging Game

combinatorics, dp, math

Relay Race

dp

Graph Cost

dp, greedy, math, number theory

Lynyrd Skynyrd

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

Choosing Balls

dp

Choosing The Commander

bitmasks, data structures, trees

Ability To Convert

constructive algorithms, dp, greedy, math, strings

Games with Rectangle

combinatorics, dp

Destruction of a Tree

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

Levko and Array

binary search, dp

Petr#

brute force, data structures, hashing, strings

Rotate Columns (easy version)

bitmasks, brute force, dp, greedy, sortings

Wet Shark and Blocks

dp, matrices

Queue

constructive algorithms, dp

Segments Removal

data structures, dsu, flows, implementation, two pointers

Famil Door and Brackets

dp, strings

Ehab and another another xor problem

bitmasks, constructive algorithms, implementation, interactive

Drazil and Tiles

constructive algorithms, greedy

Dima and Bacteria

dsu, graphs, shortest paths

Sum Graph

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

Inna and Pink Pony

greedy, implementation

Kirk and a Binary String (easy version)

brute force, greedy, strings

Roman Digits

brute force, combinatorics, dp, greedy, math

No Palindromes

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

Rudolf and Subway

constructive algorithms, dfs and similar, graphs, shortest paths

Into Blocks (easy version)

data structures, dsu, greedy, implementation, two pointers

Nene and the Mex Operator

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

MEX vs MED

math, two pointers

Fibonacci Strings

greedy, implementation, math, number theory

Intercity Travelling

combinatorics, math, probabilities

World of Darkraft: Battle for Azathoth

brute force, data structures, sortings

Gluttony

constructive algorithms, greedy

Vlad and the Mountains

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

Little Artem and Time Machine

data structures

Closest Equals

*special problem, data structures

Turn Off The TV

data structures, sortings

Array Shuffling

constructive algorithms, graphs, greedy

Robin Hood

binary search, greedy

Vasya and Good Sequences

bitmasks, dp

Unusual Sequences

bitmasks, combinatorics, dp, math, number theory

Sergey and Subway

dfs and similar, dp, trees

Coprime Subsequences

bitmasks, combinatorics, number theory

Doremy's Drying Plan (Easy Version)

brute force, data structures, dp, greedy, sortings

Gourmet choice

dfs and similar, dp, dsu, graphs, greedy

Equalizing Two Strings

constructive algorithms, sortings, strings

Captain Marmot

brute force, geometry

Thanos Nim

games

Fox and Card Game

games, greedy, sortings

Pillars

binary search, data structures, dp, sortings, trees

Triangular Paths

constructive algorithms, graphs, math, shortest paths, sortings

Shortest Path

graphs, shortest paths

Count Paths

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

Non-Palindromic Substring

hashing, implementation, math, strings

Bottom-Tier Reversals

constructive algorithms, greedy

Linguistics

greedy, implementation, sortings, strings

Circular Spanning Tree

constructive algorithms, implementation, trees

Game with modulo

binary search, constructive algorithms, interactive

Interacdive Problem

binary search, constructive algorithms, interactive

Nash Matrix

constructive algorithms, dfs and similar, graphs, implementation

Kamil and Making a Stream

math, number theory, trees

Vitya and Strange Lesson

binary search, data structures

Count the Trains

binary search, data structures, greedy, sortings

Looking for Order

bitmasks, dp

Matching vs Independent Set

constructive algorithms, graphs, greedy, sortings

Counting Arrays

combinatorics, dp, math, number theory

Mahmoud and a Dictionary

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

Messenger Simulator

data structures

Lucky Common Subsequence

dp, strings

Let's Play Osu!

dp, math, probabilities

Strip

binary search, data structures, dp, two pointers

A Growing Tree

data structures, dfs and similar, trees

Unshuffling a Deck

constructive algorithms, implementation

Glass Half Spilled

dp

Cashback

data structures, dp, greedy, math

Decreasing Debts

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

Ilya And The Tree

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

Cyclic MEX

data structures, implementation, math, two pointers

Salyg1n and Array (simple version)

constructive algorithms, interactive, math

DZY Loves Modification

brute force, data structures, greedy

Guess the Permutation

binary search, combinatorics, interactive, 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

Pchelyonok and Segments

binary search, data structures, dp, greedy, math

Moving Chips

bitmasks, dp, greedy

Equation

math

Range Sorting (Easy Version)

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

Koxia and Game

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

Small GCD

bitmasks, brute force, dp, math, number theory

Fixed Points

binary search, brute force, dp

GCD Guess

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

Case of Fugitive

data structures, greedy, sortings

Moving Dots

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