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

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

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

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

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

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

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

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

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

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

Sortable Permutations

brute force, combinatorics, math, number theory

Edge Three-Coloring

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

Cyclic Balance

binary search, constructive algorithms, dp, math

Signs of Prefix Sums

brute force, constructive algorithms, dfs and similar, dp, implementation

Treasure Map Destruction (Counting Version)

dfs and similar, dp, dsu, graphs, math

Index Removal

binary search, data structures, math

Binary Bubble Sort Inversions

data structures, math, two pointers

Treasure Map Destruction (Constructive Version)

2-sat, constructive algorithms, constructive algorithms, greedy, greedy

Plus Minus Tree

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

DivMEX

data structures, math, math, number theory

Magic Tiles

dp, greedy, implementation

Far Cities

interactive, trees, two pointers

Carrot Chopdown (Hard Version)

brute force, greedy, implementation, math

Beaver's Jumping Track (Hard Version)

data structures, dp, matrices

Beaver's Jumping Track (Easy Version)

data structures, dp, matrices

Busy Beaver

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

Bermuda Rectangle

binary search, implementation, math, number theory, two pointers

Who Will Witness the End?

fft, math, math

What Will Remain at the End? (Hard Version)

data structures

What Will Remain at the End? (Easy Version)

brute force, data structures, data structures

How Long Until Nothing Remains?

binary search, bitmasks, data structures, greedy, math, sortings

Even If the World Turns

communication, constructive algorithms, expression parsing, greedy, interactive, math, number theory

A Ribbon for Tomorrow

combinatorics, math

Nightcrawler

data structures, dfs and similar, dp, greedy, greedy, sortings, trees

Whiplash

bitmasks, constructive algorithms, math, sortings

Chronostasis

binary search, data structures, greedy

4-beauty

bitmasks, dp, graphs, math, number theory

Diameter Intersections

brute force, dfs and similar, fft, graphs, implementation, trees

Hypercarp and Interdimensional Jumps

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

Sum of Distinct Values in a Matrix

greedy, sortings, two pointers

Spectral Components

dfs and similar, dp, dp, greedy, sortings, trees

Generational Triplets

bitmasks, combinatorics, dp, math

Array Replacement

greedy, sortings

Risky Tower

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

Even Simple Path

constructive algorithms, graphs, shortest paths

String (Hard Version)

divide and conquer, implementation, strings

String (Easy Version)

divide and conquer, implementation, strings

Xor Permutation Matrix

bitmasks, constructive algorithms, math

Double-Rift Dial

data structures, dfs and similar, dsu, implementation, two pointers

Permutation Cuts

combinatorics, implementation, math

No Balance Left

bitmasks, dp, math, number theory

Matrix Elimination

binary search, greedy, math

Excuse for Breaks

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

Good Pair Queries

constructive algorithms, greedy, math

Paths on a Grid

data structures, dp, hashing

Build a Tree

constructive algorithms, trees, two pointers

XOR Sorting (Hard Version)

bitmasks, data structures, greedy

XOR Sorting (Easy Version)

bitmasks, greedy