Security Guard

*special problem, greedy

Username

*special problem, implementation

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

Make Almost Equal With Mod

bitmasks, constructive algorithms, math, number theory

Distinct Buttons

implementation, math

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

Removal of Unattractive Pairs

constructive algorithms, greedy, math, strings

YetnotherrokenKeoard

data structures, implementation, strings

Rook

implementation

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

Easy As ABC

brute force

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

Begginer's Zelda

greedy, trees

Constructive Problems

constructive algorithms, math

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

Collecting Game

binary search, dp, greedy, sortings, two pointers

Forked!

brute force, implementation

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

StORage room

bitmasks, brute force, constructive algorithms, greedy

Halloumi Boxes

brute force, greedy, sortings

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

Insert and Equalize

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

Getting Points

binary search, brute force, greedy

Binary Imbalance

constructive algorithms

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

Chip and Ribbon

greedy, math

Line Trip

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

Anji's Binary Tree

dfs and similar, dp, trees

Laura and Operations

dp, math

Cover in Water

constructive algorithms, greedy, implementation, strings

Unusual Entertainment

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

Alex's whims

constructive algorithms, graphs, greedy, shortest paths, trees

Queue Sort

greedy, implementation, sortings

Yarik and Musical Notes

hashing, math, number theory

Yarik and Array

dp, greedy, two pointers

250 Thousand Tons of TNT

brute force, implementation, number theory

Game with Integers

games, math, number theory

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

Milica and String

brute force, implementation, strings

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

AB Flipping

greedy, strings, two pointers

Jagged Swaps

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

Points and Minimum Distance

greedy, math, sortings

Treasure Chest

math

Two Out of Three

constructive algorithms