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

A Problem to Warm Up the Eyebrows

combinatorics, combinatorics, dp, dp, math, math

Repentance Is Already on the Way

dp, implementation

Pancho's Permutation

constructive algorithms, dp, greedy, math

Personal Issues (Easy Version)

dp, games, games, trees, trees

Beautiful Pillers

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

AghaBalaSar and Hamed

data structures, dp, trees

New LRT

divide and conquer, dp, fft

Deque Malfunction

binary search, data structures, dp, greedy

Modular Tree

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

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

Floor of MEX (Hard Version)

dp, implementation, math

1 2 3 and XOR, Where Did Everybody Go?

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

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

Plus Minus Tree

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

Magic Tiles

dp, greedy, implementation

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

Nightcrawler

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

4-beauty

bitmasks, dp, graphs, math, number theory

Spectral Components

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

Generational Triplets

bitmasks, combinatorics, dp, math

No Balance Left

bitmasks, dp, math, number theory

Paths on a Grid

data structures, dp, hashing

Familiar?

brute force, combinatorics, dp

Yura and Deadlines

data structures, dp

Anya Loves Trees!

dfs and similar, dp, greedy, trees, trees

Summer Vacation

data structures, data structures, data structures, dp, dp, probabilities, trees

Two Digit Strings

dp, strings

Fair and Square

combinatorics, dp, graphs, math, number theory, trees

Colorful Works

dp, fft, games, implementation

Hunting the Beast

combinatorics, dp, graphs, math

Cake Trial

dp, greedy

DBFS Order (Hard Version)

dp, trees

DBFS Order (Easy Version)

dp, trees

Paint the Array

data structures, dp, greedy

Elections in Saransk (hard version)

combinatorics, dp, dp, dp, math, number theory

Friendly Gifts

brute force, dp

Stripe, Token and Two Players

data structures, dp, games

XOR, Expression and Two Binary Numbers

bitmasks, divide and conquer, dp, math, number theory

Shortest GCD Paths

dp, graphs, math, number theory, shortest paths, shortest paths

Magical Tiered Cake

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

Graph Cutting

dfs and similar, dp, math, trees

Game on Growing Tree

binary search, dfs and similar, divide and conquer, dp, games, implementation, trees

Good Schedule

dp, greedy

The Endians

dp, trees

Wowee Binary String

combinatorics, dp, strings

Roadworks

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

Load Unbalancing

binary search, bitmasks, dp, greedy

Deconstruction Tree

combinatorics, data structures, dp, graphs, trees

Momoyo and the Network

binary search, dfs and similar, dfs and similar, divide and conquer, divide and conquer, dp, trees

Cirno and Number (Hard Version)

binary search, dfs and similar, dp, greedy, implementation

Cirno and Number (Easy Version)

binary search, brute force, dp, greedy, implementation

Fallen Leaves

dfs and similar, dp, dp, trees, trees

It Just Keeps Going Sideways

binary search, data structures, data structures, dp, dp, greedy, greedy, math, math

Reserved Reversals

constructive algorithms, dp, greedy, math

Zhily and Barknights

binary search, data structures, dp, math, sortings, two pointers

Counting Sort?

brute force, combinatorics, dp

Median Partition

dp, math

Coloring a Red Black Tree

dfs and similar, dp, greedy, math, probabilities, trees, trees

Closer

dfs and similar, dp, trees

Down the Pivot

combinatorics, dp, math, trees

Interval Game

bitmasks, combinatorics, constructive algorithms, dp, games, games, greedy, greedy, math, probabilities

EXPloration, EXPloitation, and Gain Some EXPerience!

bitmasks, brute force, dp, greedy, implementation

Interval Mod

constructive algorithms, dp, greedy, math

Learning Binary Search

combinatorics, divide and conquer, dp, math

Minimum Path Cover

brute force, dp, greedy, interactive, interactive, math, number theory, trees

A Simple GCD Problem (Hard Version)

dp, greedy, number theory

A Trivial String Problem

brute force, dp, hashing, string suffix structures, strings

Counting Cute Arrays

combinatorics, dp

Hanabi

binary search, data structures, dp, dsu, flows, graph matchings, graphs, greedy

Boxed Like a Fish

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

Where's My Water?

data structures, divide and conquer, dp, math

Growth Factor

combinatorics, dp, math, number theory

Christmas Tree Un-decoration

data structures, dp, trees

Simons and Dividing the Rhythm

combinatorics, data structures, dp, dsu, math, string suffix structures, strings, strings, strings

Simons and Beating Peaks

data structures, data structures, divide and conquer, dp, dp, greedy, implementation, trees

Grid Path

dp, dp, graphs, matrices

Binary Search with One Swap

binary search, divide and conquer, dp, hashing, math, two pointers

Rigged Bracket Sequence

combinatorics, dp, greedy

Lost Civilization (Hard Version)

data structures, dp

Operation Permutation

combinatorics, dp, math, probabilities

Sum of MEX

*special problem, combinatorics, data structures, dp, math

Fuzzy Concatenation (Hard version)

binary search, bitmasks, data structures, dp, greedy, string suffix structures

Double Bracket Sequence

data structures, dp, expression parsing, flows, greedy, strings

Interactive Graph (Hard Version)

combinatorics, dfs and similar, dp, graphs, interactive

Interactive Graph (Simple Version)

binary search, combinatorics, dfs and similar, dp, graphs, interactive

Idiot First Search and Queries

binary search, data structures, dp, graphs, trees

Parabola Independence

dp, graphs, greedy, math, sortings

Idiot First Search

dfs and similar, dp, trees

Again Trees... (hard version)

bitmasks, data structures, dfs and similar, dp, fft, trees

Again Trees... (Easy Version)

bitmasks, dfs and similar, dp, trees

The Turtle Strikes Back

dp, graphs, greedy, implementation

Remove the Grail Tree

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