Remainder Problem

brute force, data structures, implementation

Binary Subsequence Rotation

binary search, constructive algorithms, data structures, greedy

Pokémon Army (hard version)

data structures, divide and conquer, dp, greedy, implementation

Trash Problem

data structures, implementation

Cut

binary search, data structures, dp, graphs, number theory, two pointers

Olya and Energy Drinks

data structures, dfs and similar, graphs, shortest paths

Painting the Array II

constructive algorithms, data structures, dp, greedy, implementation

Present

binary search, bitmasks, constructive algorithms, data structures, math, sortings

Boring Segments

data structures, sortings, trees, two pointers

Array Partition

binary search, data structures, greedy, two pointers

Segment Tree

data structures, dsu, graphs, trees

Water Balance

data structures, geometry, greedy

Watching Fireworks is Fun

data structures, dp, math

01 Tree

constructive algorithms, data structures, dsu, greedy, sortings, trees

Optimal Partition

data structures, dp

Money Transfers

constructive algorithms, data structures, greedy, sortings

Xor Tree

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

Mishka and Interesting sum

data structures

Beautiful Mirrors

data structures, dp, math, probabilities

Monocarp and the Set

combinatorics, data structures, math

Pencils and Boxes

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

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

Number of Components

combinatorics, data structures, dp, math

Kirk and a Binary String (hard version)

data structures, greedy, math, strings

Monsters

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

Skyline Photo

data structures, divide and conquer, dp

New Year and Conference

binary search, data structures, hashing, sortings

Pictures with Kittens (hard version)

data structures, dp

Beautiful Subarrays

data structures, divide and conquer, strings, trees

Mahmoud and a xor trip

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

Funny Substrings

data structures, hashing, implementation, matrices, strings

OpenStreetMap

data structures, two pointers

Portals

data structures, dp, greedy, implementation, sortings

Array Collapse

data structures, divide and conquer, dp, trees

Pathwalks

data structures, dp, graphs

Hossam and (sub-)palindromic tree

brute force, data structures, dfs and similar, dp, strings, trees

Promising String (hard version)

data structures, implementation, math, strings

Editor

data structures, implementation

Count Binary Strings

data structures, dp

Guess Game

bitmasks, data structures, games, math, probabilities, sortings, strings, trees

Range Deleting

binary search, combinatorics, data structures, two pointers

You Are Given a WASD-string...

brute force, data structures, dp, greedy, implementation, math, strings

Rain

binary search, brute force, data structures, geometry, greedy, implementation, math

Learning to Paint

binary search, data structures, dfs and similar, dp, greedy, implementation, sortings

Wi-Fi

data structures, dp, greedy

Counting Shortcuts

data structures, dfs and similar, dp, graphs, shortest paths

Unstable String Sort

data structures, dfs and similar, dsu, graphs, greedy, implementation, strings

Lunar New Year and Red Envelopes

data structures, dp

Analysis of Pathes in Functional Graph

data structures, graphs

Space Harbour

data structures, implementation, math, sortings

Hot Start Up (hard version)

data structures, dp

Leha and another game about graph

constructive algorithms, data structures, dfs and similar, dp, graphs

Staircases

brute force, combinatorics, data structures, dfs and similar, dp, implementation, math

Cartons of milk

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

Ball Sorting

data structures, dp, sortings

Petya, Petya, Petr, and Palindromes

binary search, brute force, data structures, two pointers

Fedor and coupons

binary search, data structures, greedy, sortings

Array and Segments (Hard version)

data structures, implementation

Spaceship Solitaire

data structures, greedy, implementation

The way home

binary search, data structures, dp, graphs, greedy, shortest paths, sortings

Infinite Inversions

binary search, data structures, implementation, sortings, trees

Lipshitz Sequence

data structures, math

Permutation Sorting

data structures, sortings

Messenger

data structures, hashing, implementation, string suffix structures, strings

Time to Raid Cowavans

brute force, data structures, sortings

Check Transcription

brute force, data structures, hashing, strings

Fishes

data structures, graphs, greedy, probabilities, shortest paths

Santa Claus and a Palindrome

constructive algorithms, data structures, greedy

Addition Robot

data structures, math, matrices

Broken BST

data structures, dfs and similar

Order book

combinatorics, data structures, greedy

Permutation recovery

constructive algorithms, data structures, dfs and similar, graphs, greedy, math, sortings

Colorful Points

data structures, greedy, implementation

DNA Evolution

data structures, strings

Beard Graph

data structures, dsu, trees

Letters Removing

data structures, strings

Little Girl and Problem on Trees

data structures, graphs, trees

Cactus

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

Grouped Carriages

binary search, data structures, dp, flows, greedy

Santa Claus and Tangerines

binary search, data structures, greedy, two pointers

Counter Attack

data structures, dsu, graphs, hashing, sortings

Mahmoud and Ehab and the function

binary search, data structures, sortings

Boredom

data structures

Performance Review

data structures

Trip to Saint Petersburg

data structures

Longest Array Deconstruction

data structures, divide and conquer, dp, sortings

Getting Deals Done

binary search, data structures

Maximum Questions

data structures, dp, strings

Field Photography

bitmasks, data structures, sortings

Inna and Binary Logic

binary search, bitmasks, data structures

Maximize The Value

data structures, sortings

Little Elephant and Shifts

data structures

Hostname Aliases

*special problem, binary search, data structures, implementation, sortings, strings

Fools and Foolproof Roads

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

Parade

data structures, sortings

Diverging Directions

data structures, dfs and similar, trees

Optimizer

data structures, greedy, sortings

Zigzag

data structures