Fibonacci Additions

brute force, data structures, hashing, implementation, math

Perfect Matching

data structures, divide and conquer, interactive, trees

Spaceship Crisis Management

binary search, data structures, geometry, sortings

Groceries in Meteor Town

binary search, data structures, dsu, trees

Cats on the Upgrade (hard version)

binary search, data structures, dfs and similar, graphs, trees

Two Sequences

data structures, hashing, string suffix structures

Weighted Increasing Subsequences

data structures, dp, math

Strange Instructions

data structures, greedy, implementation

Keep XOR Low

bitmasks, combinatorics, data structures, divide and conquer, dp, math

Reindeer Games

binary search, constructive algorithms, data structures, divide and conquer, flows, graphs, shortest paths

Squid Game

data structures, dfs and similar, greedy, trees

AmShZ Wins a Bet

data structures, greedy, hashing

A Stroll Around the Matrix

data structures, greedy, math

Interesting Sections

data structures, divide and conquer, meet-in-the-middle, two pointers

Alphabetic Tree

binary search, data structures, dfs and similar, hashing, string suffix structures, strings, trees

Phys Ed Online

data structures, dp, greedy

Difficult Mountain

data structures, dp, greedy, sortings

Desert

data structures, graphs

Two Arrays

data structures, matrices

Jumping Through the Array

binary search, data structures, graphs, two pointers

Omkar and Tours

data structures, divide and conquer, sortings, trees

Omkar and Time Travel

data structures, math

Railway Construction

brute force, constructive algorithms, data structures, graphs, shortest paths

Just Kingdom

brute force, data structures, dfs and similar

Building Forest Trails

data structures, dsu

Cyclic Sum

data structures, fft, number theory

Stations

data structures

Physical Examination

*special problem, binary search, data structures

Four Vertices

constructive algorithms, data structures, graphs, greedy, implementation, shortest paths

Strange Sort

data structures, sortings

Gates to Another World

bitmasks, data structures, dsu, two pointers

Good Graph

data structures, dsu, graphs, trees

Jumping Around

binary search, data structures, divide and conquer, dp, dsu, graphs, shortest paths

Gregor and the Two Painters

data structures, divide and conquer, graphs, greedy, math

AquaMoon and Potatoes

brute force, data structures, dp

AquaMoon and Time Stop (hard version)

data structures, dp

AquaMoon and Time Stop (easy version)

data structures, dp

Inverse Inversions

binary search, brute force, data structures

String Distance

binary search, brute force, data structures, hashing, implementation, strings

A New Beginning

data structures, dp, geometry, sortings

Turing's Award

data structures, dp

Hopping Around the Array

data structures, dp

Try Booking

data structures, divide and conquer

Phoenix and Diamonds

binary search, data structures, sortings

Phoenix and Bits

bitmasks, brute force, data structures, sortings

Chips on a Board

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

Chainword

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

Optimal Encoding

brute force, data structures

Tree Calendar

brute force, constructive algorithms, data structures, dfs and similar, sortings, trees

Balance the Cards

constructive algorithms, data structures, divide and conquer, geometry, graphs, implementation

Subset Trick

binary search, data structures

Tiles for Bathroom

data structures, sortings, two pointers

Graph Coloring

data structures, graphs, interactive

Squares

constructive algorithms, data structures, dp, graphs, trees

Qingshan and Daniel

brute force, data structures, greedy, implementation

Ruler Of The Zoo

brute force, data structures

Yuezheng Ling and Dynamic Tree

data structures, trees

Flower Shop

*special problem, data structures, fft, math

Build From Suffixes

*special problem, combinatorics, data structures

Exam

data structures, string suffix structures, trees

Odd Mineral Resource

binary search, bitmasks, brute force, data structures, probabilities, trees

Nezzar and Tournaments

data structures, greedy

Minimum Difference

data structures, hashing, sortings, two pointers

Lanterns

binary search, data structures, dp

Strange Permutation

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

Bakery

data structures, dsu

The Riddle of the Sphinx

binary search, data structures, data structures, interactive

My Beautiful Madness

data structures, trees

Range Diameter Sum

data structures, trees

Nim Shortcuts

data structures, games

Flip and Reverse

data structures, graphs, greedy

Forbidden Value

data structures, dp

Game On Tree

data structures, dfs and similar, greedy, trees

Line Distance

binary search, data structures, geometry

Frequency Problem (Hard Version)

data structures, greedy, two pointers

Sum

data structures, divide and conquer, dp, greedy

Cheat and Win

bitmasks, data structures, games, trees

Boring Card Game

data structures, greedy, trees

Impressive Harvesting of The Orchard

data structures

Growing flowers

data structures

Boring Queries

data structures, math, number theory

Rain of Fire

binary search, data structures, dfs and similar, dsu, graphs, implementation

Equal Product

data structures, math, number theory, two pointers

Split

binary search, data structures, dp, greedy

Roads and Ramen

data structures, trees

Rainbow Triples

binary search, data structures, flows, greedy

Rainbow Rectangles

data structures, sortings, two pointers

Uncle Bogdan and Projections

data structures, geometry, sortings

Joker

*special problem, bitmasks, data structures, divide and conquer, dsu

Mixture

*special problem, data structures, geometry, math, sortings

Strange Operation

combinatorics, data structures, dp

Chess Strikes Back (hard version)

data structures, divide and conquer

Chess Strikes Back (easy version)

binary search, data structures

Raging Thunder

data structures, divide and conquer, implementation

Shifting Dominoes

data structures, geometry, graphs, trees

Construct the String

data structures, dp, strings

Johnny and New Toy

data structures, implementation, math

RC Kaboom Show

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

Game with Segments

*special problem, data structures, games

Train Tracks

data structures, trees