Playoff

combinatorics, constructive algorithms, dp, greedy, math

Lucky Chains

math, number theory

Number Reduction

greedy

Torus Path

greedy, math

Watch the Videos

binary search, constructive algorithms, two pointers

Doremy's City Construction

graphs, greedy

Binary Strings are Fun

combinatorics, math

Set Construction

constructive algorithms, dfs and similar, graphs, greedy

SlavicG's Favorite Problem

bitmasks, dfs and similar, graphs

Quests

binary search, greedy, sortings

All Possible Digits

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

The Humanoid

brute force, dp, sortings

Make It Round

brute force, number theory

Range = √Sum

binary search, brute force, constructive algorithms, math, two pointers

Almost All Multiples

greedy, number theory

Factorial Divisibility

math, number theory

Make Nonzero Sum (hard version)

constructive algorithms, dp, greedy

Count GCD

combinatorics, math, number theory

Complementary XOR

constructive algorithms, implementation

Number Game

binary search, data structures, games, greedy, implementation

Zero-Sum Prefixes

brute force, data structures, dp, greedy, implementation

Diverse Substrings

brute force, implementation, strings

Divisible Numbers (easy version)

brute force, math, number theory

Problem with Random Tests

brute force, dp, greedy, probabilities

Orray

bitmasks, brute force, greedy, math, sortings

Smaller

constructive algorithms, greedy, strings

Sending a Sequence Over the Network

dp

Hanging Hearts

constructive algorithms, data structures, dfs and similar, dp, greedy, trees

Knowledge Cards

constructive algorithms, data structures

Bricks and Bags

constructive algorithms, games, greedy, sortings

Card Game

combinatorics, constructive algorithms, dp, games

Even Number Addicts

dp, games, greedy, math

Ela and Crickets

constructive algorithms, games, implementation, math

Meta-set

brute force, combinatorics, data structures, hashing, math

Phase Shift

dfs and similar, dsu, graphs, greedy, implementation, strings

Slime Escape

data structures, dp, greedy, two pointers

Zero-One (Easy Version)

constructive algorithms, greedy, math

Balance (Easy version)

brute force, data structures, implementation, number theory

Sheikh (Easy version)

binary search, bitmasks, greedy, two pointers

Valiant's New Map

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

Even Subarrays

bitmasks, brute force, hashing, math, number theory

Meeting on the Line

binary search, geometry, greedy, implementation, math, ternary search

Guess the Cycle Size

interactive, probabilities

Letter Picking

constructive algorithms, dp, games, two pointers

Digital Logarithm

data structures, greedy, sortings

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 (easy version)

dp, greedy

Monoblock

combinatorics, data structures, implementation, math

Path Prefixes

binary search, data structures, dfs and similar, 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

Color the Picture

constructive algorithms, greedy, math

Rorororobot

binary search, data structures, greedy, math

Recover an RBS

constructive algorithms, greedy, implementation, strings

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

Good Key, Bad Key

bitmasks, brute force, dp, greedy, math

Equate Multisets

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

Split Into Two Sets

dfs and similar, dsu, graphs

Schedule Management

binary search, greedy, implementation, two pointers

Helping the Nature

constructive algorithms, data structures, greedy

The Third Problem

combinatorics, constructive algorithms, math

Fixed Point Guessing

binary search, constructive algorithms, interactive

awoo's Favorite Problem

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

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

Gambling

data structures, dp, greedy, math

2^Sort

data structures, dp, sortings, two pointers

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

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

Rooks Defenders

data structures, implementation

Tokitsukaze and Good 01-String (hard version)

dp, greedy, implementation

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