Guess the Cycle Size

interactive, probabilities

Letter Picking

constructive algorithms, dp, games, two pointers

Digital Logarithm

data structures, greedy, sortings

Jatayu's Balanced Bracket Sequence

data structures, dsu, graphs, greedy

Moving Both Hands

dp, graphs, shortest paths

Hot Black Hot White

constructive algorithms, math

Garage

binary search, geometry, math

Even-Odd XOR

bitmasks, constructive algorithms, greedy

L-shapes

dfs and similar, implementation

Counting Rectangles

brute force, data structures, dp, implementation

Maximum AND

bitmasks, dfs and similar, divide and conquer, greedy, sortings

Min-Max Array Transformation

binary search, greedy, two pointers

Xor-Subsequence (easy version)

bitmasks, brute force, dp, strings, trees, two pointers

Fighting Tournament

binary search, data structures, implementation, two pointers

Burenka and Traditions (hard version)

data structures, dp, greedy

Burenka and Traditions (easy version)

dp, greedy

Madoka and The Corruption Scheme

combinatorics, constructive algorithms, greedy, math

Madoka and Formal Statement

greedy

2+ doors

2-sat, bitmasks, graphs, greedy

Monoblock

combinatorics, data structures, implementation, math

Path Prefixes

binary search, data structures, dfs and similar, trees

Build a Tree and That Is It

constructive algorithms, implementation, trees

Add Modulo 10

brute force, math, number theory

Color with Occurrences

brute force, data structures, dp, greedy, strings

Tournament Countdown

constructive algorithms, greedy, interactive, number theory, probabilities

Party

brute force, graphs

Color the Picture

constructive algorithms, greedy, math

Rorororobot

binary search, data structures, greedy, math

Recover an RBS

constructive algorithms, greedy, implementation, strings

Difference Array

brute force, data structures, implementation, sortings

Doremy's IQ

binary search, constructive algorithms, greedy, implementation

Chopping Carrots (Easy Version)

binary search, brute force, constructive algorithms, greedy, number theory

Qpwoeirut And The City

dp, flows, greedy, implementation

Mark and Lightbulbs

combinatorics, constructive algorithms, greedy, math, sortings

Mark and His Unfinished Essay

brute force, implementation

Magical Array

constructive algorithms, hashing, implementation, math

Good Key, Bad Key

bitmasks, brute force, dp, greedy, math

Yet Another Problem About Pairs Satisfying an Inequality

binary search, data structures, dp, greedy, sortings

Passable Paths (easy version)

dfs and similar, trees

Equate Multisets

constructive algorithms, data structures, greedy, math, number theory

Split Into Two Sets

dfs and similar, dsu, graphs

Permutation Restoration

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

Schedule Management

binary search, greedy, implementation, two pointers

River Locks

binary search, dp, greedy, math

Helping the Nature

constructive algorithms, data structures, greedy

The Third Problem

combinatorics, constructive algorithms, math

Fixed Point Guessing

binary search, constructive algorithms, interactive

3SUM Closure

brute force, data structures

Guess The String

binary search, constructive algorithms, interactive

awoo's Favorite Problem

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

Permutation Graph

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

Fishingprince Plays With Array

constructive algorithms, greedy, implementation, math

Zero Path

brute force, data structures, dp, graphs, greedy, shortest paths

Fake Plastic Trees

dfs and similar, dp, greedy, trees

Directional Increase

greedy

Gambling

data structures, dp, greedy, math

2^Sort

data structures, dp, sortings, two pointers

3SUM

brute force, math

Max GEQ Sum

binary search, constructive algorithms, data structures, divide and conquer, implementation, two pointers

Sum of Substrings

brute force, constructive algorithms, greedy, math, strings

Shifting String

graphs, math, number theory, strings

Price Maximization

binary search, greedy, math, two pointers

Lena and Matrix

data structures, dp, geometry, shortest paths

Infected Tree

dfs and similar, dp, trees

Manipulating History

constructive algorithms, greedy, strings

Railway System

constructive algorithms, graphs, greedy, interactive, sortings

The Enchanted Forest

brute force, greedy

Traps

constructive algorithms, greedy, sortings

Column Swapping

brute force, constructive algorithms, greedy, implementation, sortings

LIS or Reverse LIS?

constructive algorithms, greedy, implementation, math

Required Length

brute force, dfs and similar, dp, hashing, shortest paths

Binary String

binary search, greedy, strings, two pointers

Toss a Coin to Your Graph...

binary search, dfs and similar, dp, graphs

Rooks Defenders

data structures, implementation

Tokitsukaze and Good 01-String (hard version)

dp, greedy, implementation

Tokitsukaze and Two Colorful Tapes

constructive algorithms, dfs and similar, graphs, greedy

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

Maximum Crossings (Easy Version)

brute force

White-Black Balanced Subtrees

dfs and similar, dp, graphs, trees

Longest Strike

data structures, greedy, implementation, sortings, two pointers

Vlad and Unfinished Business

dfs and similar, dp, greedy, trees

Replace With the Previous, Minimize

dsu, greedy, strings

Vertical Paths

graphs, implementation, trees

Desktop Rearrangement

data structures, greedy, implementation

Lost Arithmetic Progression

combinatorics, math, number theory

Palindrome Basis

brute force, dp, math, number theory

Cyclic Rotation

constructive algorithms, greedy, implementation, two pointers

Insert a Progression

brute force, constructive algorithms, greedy

Very Suspicious

binary search, brute force, geometry, greedy, implementation, math

Where is the Pizza?

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

Maximal AND

bitmasks, greedy, math

Make it Increasing

brute force, greedy, math

Labyrinth

dfs and similar, graphs

Connect the Points

brute force, constructive algorithms, geometry

Tree Infection

binary search, greedy, sortings, trees

Progressions Covering

data structures, greedy

Water the Trees

binary search, greedy, math

Getting Zero

bitmasks, brute force, dfs and similar, dp, graphs, greedy, shortest paths