Poisonous Swamp

*special problem, *special problem, implementation, implementation

Security Guard

*special problem, greedy

Short Permutation Problem

combinatorics, dp, fft, math

Parallel Swaps Sort

constructive algorithms, data structures

Pumping Lemma

hashing, strings

Small Permutation Problem (Hard Version)

combinatorics, dp, math

Small Permutation Problem (Easy Version)

brute force, combinatorics, dp, math

Multiple Lamps

bitmasks, brute force, constructive algorithms, math, number theory

Split Plus K

greedy, math, number theory

Heavy Intervals

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

Lights

brute force, constructive algorithms, dfs and similar, graphs, greedy, implementation

Shift and Reverse

greedy, sortings

Good Triples

brute force, combinatorics, number theory

Jumping Through Segments

binary search, constructive algorithms

Triangle Construction

greedy, math

Palindromic Parentheses

constructive algorithms

Deck-Building Game

divide and conquer, math

Count BFS Graph

combinatorics, dp

Contingency Plan 2

graph matchings

Twin Friends

combinatorics, dp

Grid Game 2

games, number theory

Maximize The Value

data structures, sortings

Merge Not Sort

constructive algorithms, dp

Spaceship Exploration

binary search, geometry

Cursed Game

interactive

Button Pressing

bitmasks, constructive algorithms, hashing

Field Should Not Be Empty

brute force, data structures, divide and conquer

One-X

combinatorics, dfs and similar, dp, math, trees

Cyclic MEX

data structures, implementation, math, two pointers

Largest Subsequence

greedy, strings

Beautiful Tree

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

Tree Queries

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

Set To Max (Hard Version)

constructive algorithms, data structures, divide and conquer, greedy, implementation, sortings

Set To Max (Easy Version)

brute force, constructive algorithms, greedy

Array Game

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

Babysitting

2-sat, binary search, data structures, graphs, trees

Geo Game

greedy, interactive, math

Maximum And Queries (hard version)

bitmasks, divide and conquer, dp, greedy

Maximum And Queries (easy version)

binary search, bitmasks, brute force, greedy

Theofanis' Nightmare

constructive algorithms, greedy

Trees and XOR Queries Again

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

Collapsing Strings

data structures, strings, trees

Robot Queries

binary search, data structures, dp, implementation

Landscaping

binary search, geometry, two pointers

Compressed Tree

dfs and similar, dp, graphs, greedy, sortings, trees

Yet Another Monster Fight

binary search, dp, greedy, implementation, math

Add, Divide and Floor

constructive algorithms, greedy, math

Local Deletions

binary search, data structures, implementation

Transitive Graph

dfs and similar, dp, dsu, graphs, implementation

Small GCD

bitmasks, brute force, dp, math, number theory

Unusual Entertainment

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

Alex's whims

constructive algorithms, graphs, greedy, shortest paths, trees

Vova Escapes the Matrix

brute force, dfs and similar, divide and conquer, shortest paths

Sofia and Strings

data structures, greedy, sortings, strings, two pointers

Absolute Beauty

greedy, math

Colorful Grid

constructive algorithms

Milena and Admirer

greedy, math

Cyclic Hamming (Hard Version)

brute force, dp, fft, math, number theory

Cyclic Hamming (Easy Version)

brute force, divide and conquer, dp, fft, math, number theory

Pepe Racing

constructive algorithms, implementation, interactive, sortings

Bracket Xoring

constructive algorithms, greedy, implementation, math

Permutation Sorting

data structures, sortings

Ones and Twos

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

Matching Arrays

binary search, constructive algorithms, greedy, sortings

Two Characters, Two Colors

binary search, data structures, dp, flows, greedy

Fancy Arrays

combinatorics, dp, math, matrices

Infinite Card Game

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

XOR Construction

bitmasks, constructive algorithms, data structures, math, string suffix structures, trees

Torn Lucky Ticket

brute force, dp, hashing, implementation, math

Cacti Symphony

combinatorics, dfs and similar, dp, graphs

Colorful Constructive

constructive algorithms, data structures, greedy

Freedom of Choice

brute force, greedy, implementation

Neutral Tonality

constructive algorithms, greedy, sortings, two pointers

Anonymous Informant

brute force, dfs and similar, graphs, implementation

A Growing Tree

data structures, dfs and similar, trees

Brukhovich and Exams

brute force, greedy, implementation, math, sortings

Suspicious logarithms

binary search, brute force, math

Smilo and Monsters

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

Doremy's Average Tree

data structures, dp, greedy, trees

Doremy's Swapping Trees

dfs and similar, graphs, trees

Game of Stacks

brute force, dfs and similar, graphs, implementation, trees

Doremy's Drying Plan (Hard Version)

data structures, dp

Doremy's Drying Plan (Easy Version)

brute force, data structures, dp, greedy, sortings

Doremy's Connecting Plan

constructive algorithms, greedy, math, sortings

Minimum Segments

constructive algorithms

Good Colorings

binary search, constructive algorithms, graphs, interactive

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

Time Travel

binary search, graphs, shortest paths

Diamond Theft

data structures, greedy

I Wanna be the Team Leader

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

Monocarp and the Set

combinatorics, data structures, math

Decreasing String

implementation, strings

Hard Design

greedy, implementation, math

Counting Rhyme

dp, math, number theory

Medium Design

brute force, data structures, dp, greedy, sortings

Dances (Hard Version)

binary search, greedy, sortings, two pointers

Dances (Easy version)

binary search, greedy, two pointers

You Are So Beautiful

data structures

Look Back

bitmasks, greedy