Cyclic MEX

data structures, implementation, math, two pointers

Soldier and Traveling

flows, graphs, math

Optimal Partition

data structures, dp

Money Transfers

constructive algorithms, data structures, greedy, sortings

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

Xor Tree

binary search, bitmasks, data structures, divide and conquer, dp, trees

Longest Subsequence

brute force, math, number theory

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

Arena

combinatorics, dp, math

Lucky Common Subsequence

dp, strings

Messenger Simulator

data structures

Monocarp and the Set

combinatorics, data structures, math

Mishka and Interesting sum

data structures

Beautiful Mirrors

data structures, dp, math, probabilities

Complete the Projects (easy version)

greedy

Array and Operations

flows, graph matchings, number theory

Recovering BST

brute force, dp, math, number theory, trees

GCD Queries

constructive algorithms, interactive, number theory

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

Pencils and Boxes

binary search, data structures, dp, greedy, two pointers

Looking for Order

bitmasks, dp

Count the Trains

binary search, data structures, greedy, sortings

Permutation Shift

brute force, combinatorics, constructive algorithms, dfs and similar, dsu, graphs, math

Omkar and Duck

bitmasks, constructive algorithms, interactive, math

Points on Plane

constructive algorithms, divide and conquer, geometry, 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

Best Pair

binary search, brute force, implementation

Count Paths

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

Interacdive Problem

binary search, constructive algorithms, interactive

Circular Spanning Tree

constructive algorithms, implementation, trees

Game with modulo

binary search, constructive algorithms, interactive

Gourmet choice

dfs and similar, dp, dsu, graphs, greedy

Linguistics

greedy, implementation, sortings, strings

Nene and the Mex Operator

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

Timofey and Black-White Tree

brute force, dfs and similar, divide and conquer, graphs, greedy, math, shortest paths, trees

Bottom-Tier Reversals

constructive algorithms, greedy

Thanos Nim

games

Decryption

constructive algorithms, implementation, math, number theory

Shortest Path

graphs, shortest paths

Pillars

binary search, data structures, dp, sortings, trees

Common Number

binary search, combinatorics, dp, math

Triangular Paths

constructive algorithms, graphs, math, shortest paths, sortings

More Wrong

divide and conquer, interactive

Fox and Card Game

games, greedy, sortings

Bracket Walk

data structures, greedy, strings

XOR Break --- Solo Version

bitmasks, constructive algorithms, greedy

Captain Marmot

brute force, geometry

Equalizing Two Strings

constructive algorithms, sortings, strings

Friends and Subsequences

binary search, data structures

Graph Coloring

dfs and similar, dp, graphs

MEX vs DIFF

binary search, brute force, constructive algorithms, data structures, greedy, two pointers

Number of Components

combinatorics, data structures, dp, math

The Human Equation

greedy, implementation

Sleepy Game

dfs and similar, dp, games, graphs

Game on Sum (Easy Version)

combinatorics, dp, games, math

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

Flying Sort (Easy Version)

dp, greedy, two pointers

Sergey and Subway

dfs and similar, dp, trees

Vasya and Beautiful Arrays

brute force, dp, number theory

Kirk and a Binary String (hard version)

data structures, greedy, math, strings

Monsters

brute force, data structures, dfs and similar, dsu, graphs, greedy

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

Skyline Photo

data structures, divide and conquer, dp

New Year's Puzzle

brute force, dp, graph matchings, greedy, sortings

Send Boxes to Alice (Hard Version)

constructive algorithms, greedy, math, number theory, ternary search, two pointers

Vlad and the Mountains

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

OpenStreetMap

data structures, two pointers

New Year and Conference

binary search, data structures, hashing, sortings

Little Artem and Time Machine

data structures

Gluttony

constructive algorithms, greedy

World of Darkraft: Battle for Azathoth

brute force, data structures, sortings

Minimax

constructive algorithms, greedy, strings

MEX vs MED

math, two pointers

Intercity Travelling

combinatorics, math, probabilities

Fibonacci Strings

greedy, implementation, math, number theory

Pictures with Kittens (hard version)

data structures, dp

Beautiful Subarrays

data structures, divide and conquer, strings, trees

Into Blocks (easy version)

data structures, dsu, greedy, implementation, two pointers

How Many Paths?

dfs and similar, dp, graphs, trees

Roman Digits

brute force, combinatorics, dp, greedy, math

Kirk and a Binary String (easy version)

brute force, greedy, strings