Submatrices

*special problem, bitmasks, data structures, dp

Turing's Award

data structures, dp

Partition Game

binary search, data structures, divide and conquer, dp

Potions (Easy Version)

brute force, data structures, dp, greedy

Hopping Around the Array

data structures, dp

Nastia Plays with a Tree

constructive algorithms, data structures, dfs and similar, dp, dsu, greedy, implementation, trees

Cut

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

Chips on a Board

bitmasks, brute force, data structures, dp, games, two pointers

Chainword

brute force, data structures, dp, matrices, string suffix structures, strings

Maximize the Remaining String

brute force, data structures, dp, greedy, strings

Travelling Salesman Problem

binary search, data structures, dp, greedy, shortest paths, sortings, two pointers

Christmas Game

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

Planar Reflections

brute force, data structures, dp

Square-Free Division (hard version)

data structures, dp, greedy, math, number theory, two pointers

Square-Free Division (easy version)

data structures, dp, greedy, math, number theory, two pointers

Squares

constructive algorithms, data structures, dp, graphs, trees

Maximum width

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

Pekora and Trampoline

brute force, data structures, dp, greedy, implementation

Palindromic Doubles

*special problem, data structures, dp

Pairs of Paths

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

Max Median

binary search, data structures, dp

Copy or Prefix Sum

combinatorics, data structures, dp, sortings

Skyline Photo

data structures, divide and conquer, dp

Sorting Books

data structures, dp, greedy

Painting the Array II

constructive algorithms, data structures, dp, greedy, implementation

Painting the Array I

constructive algorithms, data structures, dp, greedy, implementation

Lanterns

binary search, data structures, dp

Cleaning

data structures, dp, greedy, math

Program

data structures, dp, implementation, strings

Correct Placement

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

Strange Permutation

binary search, combinatorics, data structures, dp, graphs, implementation, two pointers

LaIS

data structures, dp, greedy

Distinctive Roots in a Tree

data structures, dfs and similar, dp, trees

Forbidden Value

data structures, dp

Xor Tree

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

Sum

data structures, divide and conquer, dp, greedy

Make It Increasing

binary search, constructive algorithms, data structures, dp, implementation

Fruit Sequences

binary search, data structures, divide and conquer, dp, two pointers

Pokémon Army (hard version)

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

Split

binary search, data structures, dp, greedy

XOR Inverse

bitmasks, data structures, divide and conquer, dp, greedy, math, sortings, strings, trees

Searchlights

binary search, brute force, data structures, dp, implementation, sortings, two pointers

Discrete Centrifugal Jumps

data structures, dp, graphs

Clear the Multiset

data structures, divide and conquer, dp, greedy

Yet Another Segments Subset

data structures, dp, graphs, sortings

Controversial Rounds

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

Good Subarrays

data structures, dp, math

Bicolored Segments

data structures, dp, graph matchings, sortings

Strange Operation

combinatorics, data structures, dp

Strange Addition

data structures, dp, matrices

Choosing flowers

binary search, brute force, data structures, dfs and similar, dp, greedy, sortings, two pointers

Flying Sort (Hard Version)

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

Construct the String

data structures, dp, strings

Yet Another Yet Another Task

data structures, dp, implementation, two pointers

Three Blocks Palindrome (hard version)

brute force, data structures, dp, two pointers

Three Blocks Palindrome (easy version)

binary search, brute force, data structures, dp, two pointers

Strange Function

binary search, data structures, dp, greedy

AND Segments

bitmasks, combinatorics, data structures, dp, two pointers

Treeland and Viruses

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

Journey Planning

data structures, dp, greedy, math, sortings

Skyscrapers (hard version)

data structures, dp, greedy

Skyscrapers (easy version)

brute force, data structures, dp, greedy

Autocompletion

data structures, dfs and similar, dp

Animal Observation (hard version)

data structures, dp, greedy

Animal Observation (easy version)

data structures, dp

Nanosoft

binary search, data structures, dp, implementation

String Coloring (hard version)

data structures, dp

Delete a Segment

brute force, constructive algorithms, data structures, dp, graphs, sortings, trees, two pointers

New Year and Ascent Sequence

binary search, combinatorics, data structures, dp, implementation, sortings

Berry Jam

data structures, dp, greedy, implementation

Portals

data structures, dp, greedy, implementation, sortings

Beautiful Mirrors

data structures, dp, math, probabilities

Economic Difficulties

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

The Contest

data structures, dp, greedy

Yet Another Monster Killing Problem

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

Antenna Coverage

data structures, dp, greedy, sortings

Find String in a Grid

data structures, dp, strings, trees

Voting (Easy Version)

data structures, dp, greedy

Balanced Distribution

data structures, dp, greedy

Alice and the Unfair Game

binary search, data structures, dp, dsu

Stack Exterminable Arrays

data structures, divide and conquer, dp, hashing

Wi-Fi

data structures, dp, greedy

You Are Given a WASD-string...

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

Graph Traveler

brute force, data structures, dfs and similar, dp, graphs, implementation, math, number theory

White Lines

brute force, data structures, dp, implementation, two pointers

Culture Code

binary search, combinatorics, data structures, dp, shortest paths, sortings

RGB Substring (hard version)

data structures, dp, implementation, two pointers

Magic Tree

*special problem, data structures, dp, trees

Candies!

data structures, dp, implementation, math

Fedor Runs for President

data structures, dp, trees

Yet Another Partiton Problem

data structures, divide and conquer, dp, geometry, two pointers

Minimal Segment Cover

data structures, dfs and similar, divide and conquer, dp, greedy, implementation, trees

Beautiful Array

brute force, data structures, divide and conquer, dp, greedy

Number of Components

combinatorics, data structures, dp, math

Lynyrd Skynyrd

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

Greedy Subsequences

data structures, dp, trees

Most Dangerous Shark

data structures, dp, two pointers

Isolation

data structures, dp

Morse Code

binary search, data structures, dp, hashing, sortings, string suffix structures, strings

Secret Letters

data structures, dp, greedy