Optimal Partition

data structures, dp

Soldier and Traveling

flows, graphs, math

Cyclic MEX

data structures, implementation, math, two pointers

Money Transfers

constructive algorithms, data structures, greedy, sortings

Decreasing Debts

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

Ilya And The Tree

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

Cashback

data structures, dp, greedy, math

Xor Tree

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

Glass Half Spilled

dp

Unshuffling a Deck

constructive algorithms, implementation

Longest Subsequence

brute force, math, number theory

Strip

binary search, data structures, dp, two pointers

A Growing Tree

data structures, dfs and similar, trees

Arena

combinatorics, dp, math

Beautiful Mirrors

data structures, dp, math, probabilities

Mishka and Interesting sum

data structures

Lucky Common Subsequence

dp, strings

Messenger Simulator

data structures

Let's Play Osu!

dp, math, probabilities

Recovering BST

brute force, dp, math, number theory, trees

Monocarp and the Set

combinatorics, data structures, math

Array and Operations

flows, graph matchings, number theory

GCD Queries

constructive algorithms, interactive, number theory

Mahmoud and a Dictionary

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

Matching vs Independent Set

constructive algorithms, graphs, greedy, sortings

Looking for Order

bitmasks, dp

Complete the Projects (easy version)

greedy

Omkar and Duck

bitmasks, constructive algorithms, interactive, math

Counting Arrays

combinatorics, dp, math, number theory

Permutation Shift

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

Pencils and Boxes

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

Count the Trains

binary search, data structures, greedy, sortings

Points on Plane

constructive algorithms, divide and conquer, geometry, greedy, sortings

Kamil and Making a Stream

math, number theory, trees

Vitya and Strange Lesson

binary search, data structures

Best Pair

binary search, brute force, implementation

Game with modulo

binary search, constructive algorithms, interactive

Interacdive Problem

binary search, constructive algorithms, interactive

Circular Spanning Tree

constructive algorithms, implementation, trees

Nash Matrix

constructive algorithms, dfs and similar, graphs, implementation

Linguistics

greedy, implementation, sortings, strings

Bottom-Tier Reversals

constructive algorithms, greedy

Decryption

constructive algorithms, implementation, math, number theory

Timofey and Black-White Tree

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

Common Number

binary search, combinatorics, dp, math

Triangular Paths

constructive algorithms, graphs, math, shortest paths, sortings

Shortest Path

graphs, shortest paths

Pillars

binary search, data structures, dp, sortings, trees

Fox and Card Game

games, greedy, sortings

Non-Palindromic Substring

hashing, implementation, math, strings

Graph Coloring

dfs and similar, dp, graphs

Captain Marmot

brute force, geometry

More Wrong

divide and conquer, interactive

Count Paths

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

Equalizing Two Strings

constructive algorithms, sortings, strings

Friends and Subsequences

binary search, data structures

Bracket Walk

data structures, greedy, strings

MEX vs DIFF

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

Sleepy Game

dfs and similar, dp, games, graphs

Number of Components

combinatorics, data structures, dp, math

Gourmet choice

dfs and similar, dp, dsu, graphs, greedy

Game on Sum (Easy Version)

combinatorics, dp, games, math

The Human Equation

greedy, implementation

Thanos Nim

games

Flying Sort (Easy Version)

dp, greedy, two pointers

Coprime Subsequences

bitmasks, combinatorics, number theory

Kirk and a Binary String (hard version)

data structures, greedy, math, strings

Sergey and Subway

dfs and similar, dp, trees

XOR Break --- Solo Version

bitmasks, constructive algorithms, greedy

Vasya and Beautiful Arrays

brute force, dp, number theory

Vasya and Good Sequences

bitmasks, dp

Unusual Sequences

bitmasks, combinatorics, dp, math, number theory

Robin Hood

binary search, greedy

Array Shuffling

constructive algorithms, graphs, greedy

Doremy's Drying Plan (Easy Version)

brute force, data structures, dp, greedy, sortings

Monsters

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

Closest Equals

*special problem, data structures

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

Skyline Photo

data structures, divide and conquer, dp

New Year and Conference

binary search, data structures, hashing, sortings

Turn Off The TV

data structures, sortings

Little Artem and Time Machine

data structures

Gluttony

constructive algorithms, greedy

Minimax

constructive algorithms, greedy, strings

Vlad and the Mountains

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

Intercity Travelling

combinatorics, math, probabilities

MEX vs MED

math, two pointers

Fibonacci Strings

greedy, implementation, math, number theory

Roman Digits

brute force, combinatorics, dp, greedy, math

Into Blocks (easy version)

data structures, dsu, greedy, implementation, two pointers

World of Darkraft: Battle for Azathoth

brute force, data structures, sortings

Kirk and a Binary String (easy version)

brute force, greedy, strings

Beautiful Subarrays

data structures, divide and conquer, strings, trees

Pictures with Kittens (hard version)

data structures, dp

Inna and Pink Pony

greedy, implementation

Treelabeling

bitmasks, constructive algorithms, dfs and similar, games, greedy, implementation, trees

Sum Graph

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

Increase Sequence

combinatorics, dp

Mahmoud and a xor trip

bitmasks, constructive algorithms, data structures, dfs and similar, dp, math, trees