Wet Shark and Blocks

dp, matrices

Queue

constructive algorithms, dp

Anya and Cubes

binary search, bitmasks, brute force, dp, math, meet-in-the-middle

Segments Removal

data structures, dsu, flows, implementation, two pointers

Famil Door and Brackets

dp, strings

Portals

data structures, dp, greedy, implementation, sortings

Rectangular Congruence

constructive algorithms, number theory

Ehab and another another xor problem

bitmasks, constructive algorithms, implementation, interactive

Drazil and Tiles

constructive algorithms, greedy

Tree with Small Distances

dp, graphs, greedy

Potion Brewing Class

dfs and similar, math, number theory, trees

Counting Rhyme

dp, math, number theory

Red-Blue Operations (Easy Version)

binary search, greedy, implementation, math

Bear and Tree Jumps

dfs and similar, dp, trees

Euclid's nightmare

bitmasks, dfs and similar, dsu, graphs, greedy, math, sortings

Dima and Bacteria

dsu, graphs, shortest paths

OpenStreetMap

data structures, two pointers

Funny Substrings

data structures, hashing, implementation, matrices, strings

Mahmoud and a xor trip

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

Nene and the Mex Operator

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

Sum Graph

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

How Many Paths?

dfs and similar, dp, graphs, trees

Increase Sequence

combinatorics, dp

Treelabeling

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

Inna and Pink Pony

greedy, implementation

No Palindromes

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

Kirk and a Binary String (easy version)

brute force, greedy, strings

Beautiful Subarrays

data structures, divide and conquer, strings, trees

Rudolf and Subway

constructive algorithms, dfs and similar, graphs, shortest paths

Pictures with Kittens (hard version)

data structures, dp

Roman Digits

brute force, combinatorics, dp, greedy, math

Into Blocks (easy version)

data structures, dsu, greedy, implementation, two pointers

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

Minimax

constructive algorithms, greedy, strings

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

New Year and Conference

binary search, data structures, hashing, sortings

Skyline Photo

data structures, divide and conquer, dp

Send Boxes to Alice (Hard Version)

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

New Year's Puzzle

brute force, dp, graph matchings, greedy, sortings

Closest Equals

*special problem, data structures

Turn Off The TV

data structures, sortings

Monsters

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

Array Shuffling

constructive algorithms, graphs, greedy

Robin Hood

binary search, greedy

Vasya and Good Sequences

bitmasks, dp

Vasya and Beautiful Arrays

brute force, dp, number theory

Unusual Sequences

bitmasks, combinatorics, dp, math, number theory

Kirk and a Binary String (hard version)

data structures, greedy, math, strings

Sergey and Subway

dfs and similar, dp, trees

Flying Sort (Easy Version)

dp, greedy, two pointers

Coprime Subsequences

bitmasks, combinatorics, number theory

Doremy's Drying Plan (Easy Version)

brute force, data structures, dp, greedy, sortings

Game on Sum (Easy Version)

combinatorics, dp, games, math

XOR Break --- Solo Version

bitmasks, constructive algorithms, greedy

The Human Equation

greedy, implementation

Gourmet choice

dfs and similar, dp, dsu, graphs, greedy

Number of Components

combinatorics, data structures, dp, math

Sleepy Game

dfs and similar, dp, games, graphs

MEX vs DIFF

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

Thanos Nim

games

Bracket Walk

data structures, greedy, strings

Equalizing Two Strings

constructive algorithms, sortings, strings

Friends and Subsequences

binary search, data structures

Graph Coloring

dfs and similar, dp, graphs

Captain Marmot

brute force, geometry

More Wrong

divide and conquer, interactive

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

Common Number

binary search, combinatorics, dp, math

Non-Palindromic Substring

hashing, implementation, math, strings

Timofey and Black-White Tree

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

Decryption

constructive algorithms, implementation, math, number theory

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

Best Pair

binary search, brute force, implementation

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

Points on Plane

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

Permutation Shift

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

Omkar and Duck

bitmasks, constructive algorithms, interactive, math

Pencils and Boxes

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

Looking for Order

bitmasks, dp

Matching vs Independent Set

constructive algorithms, graphs, greedy, sortings

Complete the Projects (easy version)

greedy

Counting Arrays

combinatorics, dp, math, number theory

Mahmoud and a Dictionary

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

Array and Operations

flows, graph matchings, number theory