Diverse Segments

binary search, data structures, two pointers

MEX vs DIFF

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

Rooks Defenders

data structures, implementation

Stone Age Problem

data structures, implementation

Tokitsukaze and Beautiful Subsegments

data structures

Tokitsukaze and Meeting

data structures, implementation, math

Tokitsukaze and Strange Inequality

brute force, data structures, dp

Maximum Crossings (Hard Version)

data structures, divide and conquer, sortings

Longest Strike

data structures, greedy, implementation, sortings, two pointers

Desktop Rearrangement

data structures, greedy, implementation

PermutationForces

data structures, greedy

Zigu Zagu

constructive algorithms, data structures, greedy

Where is the Pizza?

data structures, dfs and similar, dsu, graphs, implementation, math

Eating Candies

binary search, data structures, greedy, two pointers

2-Letter Strings

data structures, math, strings

Optimal Partition

data structures, dp

MinimizOR

bitmasks, brute force, data structures, divide and conquer, greedy, implementation, two pointers

Il Derby della Madonnina

data structures, dp, math

Antennas

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

Narrow Components

brute force, data structures, dp, dsu, math, trees

Progressions Covering

data structures, greedy

Promising String (hard version)

data structures, implementation, math, strings

Reverse Sort Sum

constructive algorithms, data structures, greedy, implementation, math, two pointers

Gojou and Matrix Game

data structures, dp, games, hashing, implementation, math, number theory, sortings

388535 (Hard Version)

bitmasks, brute force, data structures, math

Equal LCM Subsets

data structures, math, number theory

Subtract Operation

data structures, greedy, math, two pointers

Snowy Mountain

data structures, dfs and similar, graphs, greedy, shortest paths, trees

Minimal String Xoration

bitmasks, data structures, divide and conquer, greedy, hashing, sortings, strings

Arithmetic Operations

brute force, data structures, graphs, math

Alice and the Cake

data structures, greedy, implementation, sortings

Tower Defense

binary search, brute force, data structures

Nearest Excluded Points

binary search, data structures, dfs and similar, graphs, shortest paths

Fault-tolerant Network

brute force, data structures, implementation

Counting Shortcuts

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

Rescheduling the Exam

binary search, data structures, greedy, implementation, math, sortings

Two Avenues

data structures, dfs and similar, graphs

Air Reform

data structures, dfs and similar, divide and conquer, dsu, graphs, implementation, trees

Serious Business

data structures, divide and conquer, dp, implementation, shortest paths

Tyler and Strings

combinatorics, data structures, implementation

Integral Array

brute force, constructive algorithms, data structures, math

Weird Sum

combinatorics, data structures, geometry, math, matrices, sortings

Madoka and the Sixth-graders

data structures, dfs and similar, greedy

Expand the Path

brute force, combinatorics, data structures, implementation, math

Cross Coloring

data structures, implementation, math

Anonymity Is Important

binary search, brute force, data structures, dsu, greedy, sortings

Two Posters

brute force, data structures, greedy, two pointers

Colorful Operations

brute force, data structures, implementation

Big Brush

constructive algorithms, data structures, greedy, implementation

Inversion Graph

data structures, dsu, graphs, math

Odd Swap Sort

data structures, math, sortings

Minimize Inversions Number

data structures, greedy, math, sortings

Closest Pair

data structures, greedy

Fibonacci Additions

brute force, data structures, hashing, implementation, math

Fair Share

constructive algorithms, data structures, dfs and similar, graph matchings, graphs

Perfect Matching

data structures, divide and conquer, interactive, trees

Spanning Tree Queries

binary search, data structures, dfs and similar, dsu, graphs, greedy, math, sortings, trees

Distance Tree (easy version)

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

New Year Concert

binary search, data structures, greedy, math, number theory, two pointers

Range and Partition

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

Spaceship Crisis Management

binary search, data structures, geometry, sortings

Groceries in Meteor Town

binary search, data structures, dsu, trees

Not Escaping

data structures, dp, implementation, shortest paths, two pointers

Monsters And Spells

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

Cats on the Upgrade (hard version)

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

Cats on the Upgrade (easy version)

brute force, data structures, dfs and similar, divide and conquer, dp, graphs, trees

Binary Spiders

bitmasks, data structures, implementation, math, sortings, trees

Middle Duplication

data structures, dfs and similar, greedy, strings, trees

Berland Music

data structures, greedy, math, sortings

Two Sequences

data structures, hashing, string suffix structures

Weighted Increasing Subsequences

data structures, dp, math

Strange Instructions

data structures, greedy, implementation

New School

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

Integers Shop

data structures, greedy, implementation

Replace the Numbers

constructive algorithms, data structures, dsu, implementation

Permutation and Queries

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

MEX and Increments

constructive algorithms, data structures, dp, greedy, implementation, math, sortings

Trader Problem

data structures, dsu, greedy, sortings

Keep XOR Low

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

Lexicographically Small Enough

brute force, data structures, greedy, strings

Reindeer Games

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

Purple Crayon

data structures, dfs and similar, games, graphs, greedy, math, sortings, trees

Divan and a Cottage

binary search, data structures

Robot and Candies

data structures, graph matchings, greedy

ATM and Students

binary search, data structures, two pointers

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

William The Oblivious

bitmasks, data structures, dp, matrices

Alphabetic Tree

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

Game Master

data structures, dfs and similar, dp, graphs, greedy, two pointers

Phys Ed Online

data structures, dp, greedy

Difficult Mountain

data structures, dp, greedy, sortings

Optimal Insertion

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

Frog Traveler

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

Desert

data structures, graphs

Two Arrays

data structures, matrices

RBS

binary search, bitmasks, brute force, data structures, dp

Staircases

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