Scooter

graphs, greedy

Dating

greedy, sortings, trees

Damage per Second

brute force, math

Funny or Scary?

constructive algorithms

Grove

brute force, dfs and similar, dp, geometry, probabilities

MST with Matching

bitmasks, brute force, dsu, graph matchings, trees

Rare Coins

combinatorics, math, probabilities

Clique Partition

brute force, constructive algorithms, graphs, greedy, implementation

Nobody is needed

2-sat, data structures, dfs and similar, dp

Girl Permutation

combinatorics, dp, math, number theory

GCD is Greater

brute force, data structures, math, number theory

Cook and Porridge

binary search, constructive algorithms, data structures, implementation

Minimum Hamming Distance

dp

MEX Game 2 (Hard Version)

binary search, greedy, two pointers

MEX Game 2 (Easy Version)

binary search, brute force, greedy

Counting Is Fun (Hard Version)

combinatorics, dp

Counting Is Fun (Easy Version)

brute force, combinatorics, dp, math

Tree Compass

constructive algorithms, dfs and similar, greedy, trees

Non-Palindromic Substring

hashing, implementation, math, strings

Farmer John's Favorite Intern

data structures, dp, flows, trees

Bessie and Cards

combinatorics, dp, math

Farmer John's Favorite Function

brute force, data structures, implementation, math

Farm Game

combinatorics, games

Learning to Paint

binary search, data structures, dfs and similar, dp, greedy, implementation, sortings

Rudolf and Subway

constructive algorithms, dfs and similar, graphs, shortest paths

Zig-zag

XOR Operations

Tree Quiz

There and Back Again

Symmetric Boundary

Personality Test

Forming Groups

Duplicates

Bánh Bò

Attraction Score

Antiparticle Antiphysics

Grand Finale: Circles

binary search, geometry

Yet Yet Another Permutation Problem

divide and conquer, fft, math

Bitwise Paradox

binary search, bitmasks, data structures, greedy, two pointers

Pokémon Arena

data structures, graphs, greedy, implementation, shortest paths, sortings

Pinball

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

Andrey's Tree

binary search, constructive algorithms, data structures, dfs and similar, dsu, greedy, implementation, trees

Distance Learning Courses in MAC

bitmasks, brute force, data structures, greedy, math

Weird LCM Operations

brute force, constructive algorithms, number theory

XOR Break --- Game Version

bitmasks, games, greedy, interactive

XOR Break --- Solo Version

bitmasks, constructive algorithms, greedy

Turtle Magic: Royal Turtle Shell Pattern

bitmasks, brute force, combinatorics, constructive algorithms, dfs and similar, math

Turtle Mission: Robot and the Earthquake

dfs and similar, dp, graphs, shortest paths

Moving Platforms

graphs, math, number theory, shortest paths

One-Dimensional Puzzle

combinatorics, math, number theory

Counting Is Fun

combinatorics

Interactive Mex Tree

constructive algorithms, dfs and similar, interactive, trees

Prefix Max Set Counting

data structures, dp, trees

Maximize the Difference

bitmasks, brute force, dfs and similar

2..3...4.... Wonderful! Wonderful!

combinatorics, dp, math

Sum over all Substrings (Hard Version)

bitmasks, divide and conquer, dp, dsu, greedy, implementation, strings

Sasha and the Wedding Binary Search Tree

brute force, combinatorics, data structures, dfs and similar, math, trees

Sasha and the Happy Tree Cutting

bitmasks, brute force, dfs and similar, dp, graphs, greedy, math, trees

Digital Patterns

combinatorics, data structures, implementation, math

Modular Sequence

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

Paint Charges

data structures, dp, greedy, math

Vlad and Avoiding X

bitmasks, brute force, dfs and similar, dp, implementation

Anti-Proxy Attendance

constructive algorithms, dp, interactive, ternary search

Paper Cutting Again

combinatorics, probabilities

Balanced Subsequences

combinatorics, dp, math

Fractal Origami

geometry, math, matrices

Space Harbour

data structures, implementation, math, sortings

Shrink-Reverse

binary search, brute force, greedy, hashing, implementation, string suffix structures, strings

Count Paths

data structures, dfs and similar, dp, dsu, graphs, trees

Replace on Segment

dp, graph matchings

Mischievous Shooter

brute force, data structures, divide and conquer, dp, implementation

Smooth Sailing (Hard Version)

binary search, data structures, dsu, geometry, graphs, trees

Smooth Sailing (Easy Version)

binary search, brute force, data structures, dfs and similar, dsu, graphs, shortest paths

Counting Binary Strings

combinatorics, dp, math

Tree Diameter

interactive, trees

Tree LGM

constructive algorithms, divide and conquer, games, trees

Wine Factory (Hard Version)

data structures, dp, flows, greedy, matrices

Wine Factory (Easy Version)

data structures, greedy

Counting Prefixes

combinatorics, constructive algorithms, dp, implementation, math

01 Tree

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

Permutation of Given

constructive algorithms, math

Caterpillar on a Tree

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

ace5 and Task Order

constructive algorithms, divide and conquer, implementation, interactive, probabilities, sortings

Construct Tree

bitmasks, constructive algorithms, dp, trees

Construct Matrix

constructive algorithms, math

Yet Another Inversions Problem

combinatorics, data structures, dp, implementation, math, number theory

Matrix Rank (Hard Version)

combinatorics, dp, math, matrices, string suffix structures

Matrix Rank (Easy Version)

brute force, combinatorics, dp, math, matrices

Optimizations From Chelsu

divide and conquer, dp, number theory, trees

Group Division

constructive algorithms, dfs and similar, graphs, greedy

Happy Life in University

data structures, dfs and similar, greedy, trees

Light Bulbs (Hard Version)

combinatorics, data structures, dfs and similar, dp, graphs, hashing

Light Bulbs (Easy Version)

brute force, combinatorics, dfs and similar, dp, dsu, graphs, math, trees

Palindromic Problem

binary search, data structures, hashing, string suffix structures, strings

Matrix Problem

flows, graphs

Array Collapse

data structures, divide and conquer, dp, trees

Joy of Pokémon Observation

Innovative Washing Machine

geometry, math, two pointers

Hypercatapult Commute

graphs

Great City Saint Petersburg

data structures