The Trail

brute force, constructive algorithms, greedy, math, two pointers

Affectionate Arrays (Hard Version)

data structures, dp, graphs, greedy, math, shortest paths, two pointers

Counting Pairs

binary search, sortings, two pointers

Kevin and Competition Memories

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

Adventurers

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

Recommendations

data structures, implementation, sortings, two pointers

Selection Sort

binary search, data structures, greedy, two pointers

Non Prime Tree

brute force, constructive algorithms, dfs and similar, greedy, number theory, trees, two pointers

Ordered Permutations

bitmasks, combinatorics, constructive algorithms, greedy, math, two pointers

Bridge Renovation

brute force, dp, greedy, math, two pointers

Ardent Flames

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

Kachina's Favorite Binary String

dp, greedy, interactive, two pointers

Sharky Surfing

data structures, greedy, two pointers

XORificator 3000

bitmasks, dp, number theory, two pointers

Rakhsh's Revival

data structures, greedy, implementation, two pointers

Sakurako's Field Trip

dp, greedy, two pointers

Genokraken

constructive algorithms, data structures, graphs, greedy, implementation, interactive, trees, two pointers

Trinity

binary search, math, sortings, two pointers

Penchick and Desert Rabbit

binary search, data structures, dfs and similar, dp, dsu, greedy, implementation, two pointers

Orangutan Approved Subarrays

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

Alice's Adventures in Cutting Cake

binary search, dp, greedy, two pointers

The Endspeaker (Hard Version)

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

The Endspeaker (Easy Version)

binary search, dp, graphs, greedy, implementation, two pointers

Attribute Checks

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

New Game

binary search, brute force, greedy, implementation, sortings, two pointers

Two Screens

binary search, greedy, strings, two pointers

Speedbreaker

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

Message Transmission Error (hard version)

hashing, string suffix structures, strings, two pointers

Yunli's Subarray Queries (easy version)

binary search, data structures, two pointers

Eri and Expanded Sets

data structures, divide and conquer, math, number theory, two pointers

Turtle and Three Sequences

brute force, data structures, dp, greedy, math, probabilities, two pointers

Turtle and Inversions (Hard Version)

brute force, data structures, divide and conquer, dp, greedy, math, two pointers

Right Left Wrong

greedy, implementation, two pointers

Seating in a Bus

two pointers

Make Three Regions

constructive algorithms, two pointers

Let Me Teach You a Lesson (Hard Version)

data structures, dp, matrices, two pointers

Let Me Teach You a Lesson (Easy Version)

2-sat, data structures, dp, matrices, two pointers

Bouquet (Hard Version)

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

Bouquet (Easy Version)

binary search, brute force, greedy, sortings, two pointers

Hungry Games

binary search, dp, two pointers

Valuable Cards

brute force, dp, greedy, number theory, two pointers

Polygonal Segments

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

Smithing Skill

brute force, data structures, dp, greedy, math, sortings, two pointers

Mathematical Problem

brute force, dp, greedy, implementation, math, two pointers

array-value

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

Boring Day

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

Manhattan Triangle

binary search, constructive algorithms, data structures, geometry, implementation, two pointers

Large Graph

data structures, dfs and similar, dsu, graphs, number theory, two pointers

Invertible Bracket Sequences

binary search, combinatorics, data structures, divide and conquer, implementation, two pointers

Job Interview

binary search, dp, greedy, implementation, two pointers

Cutting Game

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

Cat, Fox and the Lonely Array

binary search, bitmasks, data structures, greedy, math, two pointers

Contest Proposal

brute force, greedy, two pointers

Prefiquence

greedy, two pointers

Long Way to be Non-decreasing

binary search, dfs and similar, graphs, implementation, shortest paths, two pointers

Inaccurate Subsequence Search

data structures, two pointers

Amanda the Amoeba

graphs, implementation, trees, two pointers

Tandem Repeats?

brute force, strings, two pointers

MEX Game 2 (Hard Version)

binary search, greedy, two pointers

Rudolf and Imbalance

binary search, greedy, sortings, two pointers

Rudolf and k Bridges

binary search, data structures, dp, two pointers

More Gifts

*special problem, dfs and similar, two pointers

Bitwise Paradox

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

Pinball

binary search, data structures, implementation, math, two pointers

LR-remainders

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

Equalize

binary search, greedy, sortings, two pointers

Klever Permutation

constructive algorithms, math, two pointers

Find the Different Ones!

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

Slimes

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

Very Different Array

data structures, greedy, sortings, two pointers

Blocking Elements

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

Innovative Washing Machine

geometry, math, two pointers

Cyclic MEX

data structures, implementation, math, two pointers

Array Game

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

Collecting Game

binary search, dp, greedy, sortings, two pointers

Landscaping

binary search, geometry, two pointers

Unusual Entertainment

data structures, dfs and similar, dsu, shortest paths, sortings, trees, two pointers

Yarik and Array

dp, greedy, two pointers

Sofia and Strings

data structures, greedy, sortings, strings, two pointers

Ones and Twos

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

AB Flipping

greedy, strings, two pointers

Infinite Card Game

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

Neutral Tonality

constructive algorithms, greedy, sortings, two pointers

Smilo and Monsters

binary search, constructive algorithms, greedy, sortings, two pointers

Split

binary search, data structures, divide and conquer, dsu, math, trees, two pointers

Minimum Array

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

I Wanna be the Team Leader

bitmasks, constructive algorithms, dp, greedy, math, sortings, two pointers

Haunted House

binary search, greedy, math, two pointers

Dances (Hard Version)

binary search, greedy, sortings, two pointers

Dances (Easy version)

binary search, greedy, two pointers

Lexichromatography

combinatorics, dfs and similar, dsu, graphs, two pointers

Money Trees

binary search, greedy, math, two pointers

1D Eraser

greedy, implementation, two pointers

Colorful Table

binary search, data structures, dp, implementation, math, two pointers

Imagination Castle

dp, games, two pointers

Speedrun

brute force, dfs and similar, dp, graphs, greedy, math, sortings, two pointers

Trees and Segments

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

Imbalanced Arrays

constructive algorithms, graphs, greedy, math, sortings, two pointers

Vlad and the Mountains

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

Parity Sort

greedy, sortings, two pointers