Colouring Game

constructive algorithms, dp, games

Count Seconds

brute force, constructive algorithms, dp, graphs, implementation, math

Passable Paths (hard version)

data structures, dfs and similar, trees

Points

combinatorics, data structures, implementation, math, matrices

Text Editor

brute force, dp, greedy, strings

Puzzle

constructive algorithms, dp, greedy

Serega the Pirate

brute force, constructive algorithms

Three Days Grace

data structures, dp, greedy, math, number theory, two pointers

Almost Triple Deletions

data structures, dp, greedy

Long Binary String

bitmasks, math, matrices, meet-in-the-middle, number theory

Equal Reversal

constructive algorithms, graphs, implementation, math

PermutationForces II

brute force, combinatorics, greedy, sortings, trees, two pointers

Too Many Constraints

2-sat, constructive algorithms, graphs, implementation

Coloring

brute force, combinatorics, constructive algorithms, dp, geometry, graphs, greedy, implementation, math

Maximum Product?

brute force, combinatorics, dp, greedy, implementation, math, two pointers

Fishingprince Plays With Array Again

brute force, data structures, geometry, math

Tree Recovery

brute force, constructive algorithms, dfs and similar, dsu, graphs, trees

Placing Jinas

combinatorics, math

Ambiguous Dominoes

constructive algorithms, dfs and similar, graphs

Tree Queries (Hard Version)

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

Tree Queries (Easy Version)

brute force, constructive algorithms, dfs and similar, dp, greedy, trees

I Might Be Wrong

binary search, greedy, two pointers

Outermost Maximums

data structures, greedy

Decinc Dividing

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

Keshi in Search of AmShZ

graphs, greedy, shortest paths

K-Set Tree

combinatorics, dfs and similar, dp, math, trees

Number of Groups

data structures, dfs and similar, dsu, graphs, greedy, sortings

Count the Trains

binary search, data structures, greedy, sortings

ANDfinity

bitmasks, brute force, constructive algorithms, dfs and similar, dsu, graphs

Koishi's Unconscious Permutation

fft, math

Become Big For Me

combinatorics, constructive algorithms, greedy, math, number theory

Cute number

binary search, brute force, data structures, dsu, implementation, math

Sanae and Giant Robot

binary search, brute force, data structures, dsu, greedy, sortings

The Ultimate LIS Problem

data structures, greedy

Permutation Weight (Hard Version)

constructive algorithms, greedy

Permutation Weight (Easy Version)

constructive algorithms, dfs and similar, dsu

Bring Balance

brute force, constructive algorithms, greedy

Linguistics

greedy, implementation, sortings, strings

Hard Cut

constructive algorithms, dfs and similar, divide and conquer, math

Euclid Guess

constructive algorithms, flows, graph matchings, math, number theory

Diverse Segments

data structures, two pointers

MEX vs DIFF

binary search, brute force, constructive algorithms, data structures, greedy, two pointers

MCMF?

data structures, flows, graphs, greedy, sortings, two pointers

Unordered Swaps

constructive algorithms, dfs and similar, graphs, greedy, math, sortings, trees

Circular Spanning Tree

constructive algorithms, implementation, trees

Unique Occurrences

data structures, dfs and similar, divide and conquer, dp, dsu, trees

Labyrinth Adventures

data structures, dp, matrices, shortest paths

Lenient Vertex Cover

dfs and similar, divide and conquer, dsu, graphs, trees

Moving Chips

bitmasks, dp, greedy

Dog Walking

brute force, greedy, math

Formalism for Formalism

bitmasks, dp, math

Typical Party in Dorm

bitmasks, combinatorics, dp, strings

Tokitsukaze and Gems

dp, math

Tokitsukaze and Beautiful Subsegments

data structures

Tokitsukaze and Permutations

dp, math

Sorting Pancakes

dp

Remove Directed Edges

dfs and similar, dp, graphs

Breaking the Wall

binary search, brute force, constructive algorithms, greedy, math

Anti-Theft Road Planning

bitmasks, constructive algorithms, divide and conquer, greedy, interactive, math

Power or XOR?

bitmasks, combinatorics, math, number theory

PermutationForces

data structures, greedy

Zigu Zagu

constructive algorithms, data structures, greedy

Cross Xor

constructive algorithms, graphs, math, matrices

Checker for Array Shuffling

constructive algorithms, dfs and similar, graphs

Array Shuffling

constructive algorithms, graphs, greedy

notepad.exe

binary search, constructive algorithms, greedy, interactive

Permutation Counting

brute force, combinatorics, dp, fft, math

Preorder

combinatorics, divide and conquer, dp, dsu, hashing, sortings, trees

Jee, You See?

bitmasks, combinatorics, dp

Hemose on the Tree

bitmasks, constructive algorithms, dfs and similar, trees

Yin Yang

implementation

Centroid Probabilities

combinatorics, dp, fft, math

Edge Elimination

constructive algorithms, dfs and similar, dp, trees

Half Queen Cover

constructive algorithms, math

Optimal Partition

data structures, dp

Kingdom Partition

flows

Job Lookup

constructive algorithms, dp, shortest paths, trees

Interactive Treasure Hunt

brute force, constructive algorithms, geometry, interactive, math

Heroes of Might

math

Global Warming

geometry, math

Fancy Stack

combinatorics, dp, implementation

Even Split

binary search, constructive algorithms, greedy, math

Budget Distribution

Admissible Map

MinimizOR

bitmasks, brute force, data structures, divide and conquer, greedy, implementation, two pointers

GCD Guess

bitmasks, chinese remainder theorem, constructive algorithms, games, interactive, math, number theory

Teleporters

binary search, greedy

Narrow Components

brute force, data structures, dp, dsu, math, trees

Promising String (hard version)

data structures, implementation, math, strings

Tree and Permutation Game

dfs and similar, games, graphs, trees

AND-MEX Walk

bitmasks, brute force, constructive algorithms, dfs and similar, dsu, graphs

Juju and Binary String

brute force, constructive algorithms, greedy, math

Gojou and Matrix Game

data structures, dp, games, hashing, implementation, math, number theory, sortings

388535 (Hard Version)

bitmasks, brute force, data structures, math

Words on Tree

2-sat, dfs and similar, dsu, graphs, trees

Star MST

combinatorics, dp, graph matchings, math

For Gamers. By Gamers.

binary search, brute force, greedy, math, sortings

Neighbour Ordering

constructive algorithms, graphs

Equal LCM Subsets

data structures, math, number theory

Cycle Palindrome

constructive algorithms, graphs, math