Lexicographic Partition

constructive algorithms, math, trees

Longest Good Subsequence

dp, math, trees

Maximise Sum

binary search, data structures

Appending Permutations (Hard Version)

combinatorics, dp

Appending Permutations (Easy Version)

combinatorics, dp

Make it Zero

constructive algorithms, greedy, math

Make a Palindrome

greedy, sortings, two pointers

Subset Multiplication

constructive algorithms, greedy, math, number theory

Minimise Sum

greedy

Deranged Deletions

greedy, sortings

Modular Sorting

brute force, data structures, greedy, math, number theory, sortings

Minimize Fixed Points

constructive algorithms, number theory

MEX Count

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

Binary String Battle

constructive algorithms, games, greedy

Prefix Min and Suffix Max

brute force, data structures

Tournament

greedy

Blackboard Game

math

Ice Baby

binary search, brute force, data structures, dp, implementation, sortings

Gangsta

data structures, divide and conquer, math, sortings

Yamakasi

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

Sponsor of Your Problems

dp, greedy, implementation, strings

1709

implementation, sortings

Those Who Are With Us

greedy, greedy, implementation

Above the Clouds

constructive algorithms, greedy, strings

Letter Home

brute force, math

Eulerian Line Graph

graphs, greedy, math

Superb Graphs

2-sat, graphs

Lanes of Cars

binary search, dp, ternary search

Matrix game

combinatorics, math

Divine Tree

constructive algorithms, greedy, math, sortings, trees

Square Pool

geometry

Square of Rectangles

geometry, math

Volcanic Eruptions

dfs and similar, dp, greedy, shortest paths, trees

And Constraint

bitmasks, dp, greedy

Token Removing

combinatorics, dp, math

A Good Problem

bitmasks, constructive algorithms, math

Line Segments

geometry, greedy, math

Add or XOR

greedy, math

Shifts and Swaps

data structures, graphs, hashing, trees

Grid Coloring

constructive algorithms, geometry, greedy, math

Red Light, Green Light (Hard version)

binary search, brute force, data structures, dfs and similar, dp, graphs, implementation, math, number theory

Red Light, Green Light (Easy version)

brute force, dfs and similar, dp, graphs, implementation, number theory

Make It Beautiful

bitmasks, data structures, greedy, math

Make It Permutation

constructive algorithms

Equal Subsequences

constructive algorithms, greedy

Incessant Rain

data structures, divide and conquer, sortings

Omg Graph

brute force, dsu, graphs, greedy, shortest paths, sortings

Wildflower

combinatorics, dfs and similar, trees

Lost Soul

brute force, greedy

Retaliation

binary search, math, number theory

Cool Partition

data structures, greedy

Shrink

constructive algorithms

False Alarm

greedy, implementation

Gellyfish and Baby's Breath

greedy, math, sortings

Gellyfish and Tricolor Pansy

games, greedy

Gellyfish and Lycoris Radiata (Hard Version)

data structures

Gellyfish and Lycoris Radiata (Easy Version)

data structures

Gellyfish and Mayflower

dp, graphs

Gellyfish and Forget-Me-Not

bitmasks, dp, games, greedy, math

Gellyfish and Eternal Violet

combinatorics, dp, greedy, math, probabilities

Gellyfish and Camellia Japonica

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

Gellyfish and Flaming Peony

constructive algorithms, dp, math, number theory

Build an Array

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

Small Operations

binary search, brute force, dfs and similar, dp, math, number theory, sortings

Kirei Attacks the Estate

dfs and similar, dp, greedy, trees

Come a Little Closer

brute force, greedy, implementation, math

Need More Arrays

dp, greedy

Not Quite a Palindromic String

greedy, math

Square Year

binary search, brute force, math

Two Arrays

constructive algorithms, dfs and similar, graphs, math

From Kazan with Love

dfs and similar, graphs, implementation, trees

Cheater

binary search, constructive algorithms, greedy, implementation

Smilo and Minecraft

brute force, constructive algorithms, greedy

Good Start

constructive algorithms, math

Shashliks

greedy, math

Variables and Operations

graphs, greedy, shortest paths

Tree Colorings

combinatorics, dfs and similar, dp, graphs, math, number theory, trees

Reachability and Tree

constructive algorithms, dfs and similar, graphs, trees

Coloring Game

binary search, brute force, greedy, two pointers

Shrinking Array

brute force, greedy

Race

implementation, math

Divisible Subarrays

binary search, bitmasks, brute force, data structures, interactive

Puzzle

brute force, constructive algorithms, greedy, math

Changing the String

binary search, data structures, greedy, implementation, sortings, strings

Creating a Schedule

constructive algorithms, data structures, greedy, implementation, sortings

Equal Values

brute force, greedy, two pointers

Fibonacci Cubes

brute force, dp, implementation, math

Energy Crystals

greedy, implementation, math

Faculty

brute force, greedy, math, number theory

Melody

dfs and similar, graphs, implementation

Fewer Batteries

binary search, dfs and similar, dp, graphs, greedy, hashing

Racing

constructive algorithms, greedy

Down with Brackets

strings

Fashionable Array

implementation, sortings

Penguin Steps

binary search, dfs and similar, flows, graphs, shortest paths

Binary String Wowee

combinatorics, dp, strings

D/D/D

dfs and similar, graphs, greedy, shortest paths

Hacking Numbers (Hard Version)

constructive algorithms, interactive, math, number theory

Hacking Numbers (Medium Version)

constructive algorithms, interactive, math, number theory

Hacking Numbers (Easy Version)

bitmasks, constructive algorithms, interactive, math, number theory