0s and 1s

bitmasks, dfs and similar, dp, hashing, number theory, trees

Modulo and Counting

dp, math, number theory

Swap and Negate

constructive algorithms, constructive algorithms, constructive algorithms, greedy

Lock and Unlock

greedy

Math and Physics

greedy

Stakes and Shapes

constructive algorithms, greedy

Fraction and Six

implementation, sortings, strings

Token Re-Moving

data structures, dfs and similar, dsu, trees

Tree Guessing

constructive algorithms, interactive, trees

Number Operating (Hard Version)

bitmasks, brute force, divide and conquer, dp

Number Operating (Easy Version)

binary search, bitmasks, brute force, greedy

Edge Addeleting

dfs and similar, greedy, trees

Sequence Decreasing

constructive algorithms, greedy

Subset Selecting

greedy

Elimination of Players

combinatorics, dp, math

Permutation Coloring Game

brute force, dp, dsu, games, greedy, implementation, math

Good Substrings

combinatorics, data structures, data structures, dp, greedy, greedy, strings

Caveman

combinatorics, graphs

Subarrays

math, number theory

Replace and Compress

implementation, strings

Perfect Sandwiches

greedy, math

A Problem to Warm Up the Eyebrows

combinatorics, combinatorics, dp, dp, math, math

Copper Squander

binary search, data structures, dsu, graphs, greedy, math, sortings, ternary search

Tea Blend

hashing, math, number theory

Repentance Is Already on the Way

dp, implementation

Precision Alignment

binary search, brute force, greedy, implementation

Unrequited Love

brute force, data structures

Did Not Go to Print

data structures, implementation

In Search of Convenience

geometry, implementation

Prefix

greedy

The Projections of Paco

dfs and similar, dp, hashing, implementation, math

Pancho's Permutation

constructive algorithms, dp, greedy, math

Six-Seven Bags

brute force, greedy, interactive

Aura Battle

brute force, implementation, interactive, math

Matrix Puzzle

brute force, data structures, implementation, math, matrices

Robot Championship

constructive algorithms, math

Lavencia Oranges

binary search, constructive algorithms, dp, greedy

Ranges

data structures, data structures, divide and conquer, dsu

Tree Reduction Game

dfs and similar, dp, games, trees

Memory Cell Interception

binary search, greedy, two pointers

Connecting the Conflicts

brute force, constructive algorithms, dfs and similar, dp

Yet Another Black Cell Problem

binary search, constructive algorithms, dp, greedy

Frogs Jump

constructive algorithms, greedy

Maximize One MEX

brute force, constructive algorithms, greedy

Personal Issues (Hard Version)

games, games, trees, trees

Personal Issues (Easy Version)

dp, games, games, trees, trees

Grid Filling

constructive algorithms, constructive algorithms, greedy, greedy, implementation, implementation

Beautiful Pillers

constructive algorithms, constructive algorithms, data structures, dp, greedy, implementation

Array Emptying

binary search, binary search, data structures, greedy, greedy

Target Infection

binary search, brute force, greedy, implementation, two pointers

XOR Problem

bitmasks, constructive algorithms, graphs, greedy, math

MEX Game

games

Robot Odd Moves

constructive algorithms, math

KiaKio and Squared Numbers

brute force, implementation

SauSaGe Bank

greedy, math

Deglado

constructive algorithms

Kia Kio and Tree of Life

data structures, fft, math, trees

AghaBalaSar and Hamed

data structures, dp, trees

KiaKio and Energy Intervals

binary search, bitmasks, data structures, divide and conquer, dsu, greedy, trees, two pointers

What a SauSaGe! It's All Meat

bitmasks, brute force, data structures, math

K Is Important

constructive algorithms, greedy

New LRT

divide and conquer, dp, fft

XOR Transformations (Hard Version)

bitmasks, brute force, data structures, dfs and similar, greedy, math, sortings, strings, trees

XOR Transformations (Easy Version)

bitmasks, brute force, implementation, sortings

Clean Substrings

combinatorics, data structures, math

Backrooms Hill

constructive algorithms, dp, greedy, sortings, two pointers

GCD Treasury

greedy, math, number theory

Fashionable Array

brute force, constructive algorithms, sortings

Turn Into a Palindrome

greedy, strings

Deque Malfunction

binary search, data structures, dp, greedy

Modular Tree

dfs and similar, dp, greedy, math, number theory, trees

MEX Replacement

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

Prime Destruction

brute force, dp, math, number theory

Falling Concrete

constructive algorithms, data structures, math, sortings

AND, OR, Sort!

greedy, strings

Three Piles

games, greedy, math

Good Contest

greedy

Deranged Calculator

constructive algorithms, implementation, math

A Prime Flood (Hard Version)

brute force, combinatorics, combinatorics, combinatorics, dp, dp, number theory, number theory

A Prime Flood (Easy Version)

combinatorics, dp, number theory

Dr. Agos's Dark Mode

brute force, chinese remainder theorem, constructive algorithms, math, strings

Madamant's Skating Dynasty

combinatorics, math, sortings

Knife's Pill Farm

data structures, greedy, math

Rumb Needs a Hand

implementation, implementation, implementation, sortings, sortings, sortings, two pointers, two pointers, two pointers

Min Matrices

constructive algorithms, constructive algorithms, constructive algorithms, constructive algorithms, constructive algorithms

Min Max Game

games

Rank Removal

math

Paired Bracket Sequences

combinatorics, math

PLUSworld

constructive algorithms, graphs, greedy

Traveling the World

combinatorics, constructive algorithms, graphs, greedy, math

Culling Game

binary search, data structures, implementation, two pointers

Floor of MEX (Hard Version)

dp, implementation, math

Floor of MEX (Easy Version)

constructive algorithms, greedy

Oh Tree Tree Tree, No Need to Leave

bitmasks, communication, constructive algorithms, dfs and similar, interactive, trees

1 2 3 and XOR, Where Did Everybody Go?

bitmasks, data structures, divide and conquer, dp, greedy, sortings, two pointers

Plegma II: Ask Me Any Cell (Hard Version)

constructive algorithms

Plegma II: Ask Me Any Cell (Easy Version)

constructive algorithms, greedy, math

What Does the Cow Say?

binary search, data structures, dfs and similar, greedy, trees

Come Be My Friend, Don't Be So Scared (Hard Version)

constructive algorithms, data structures, dsu, graphs, hashing, trees, two pointers

Come Be My Friend, Don't Be So Scared (Easy Version)

constructive algorithms, greedy, math