Olympiad Date

greedy, strings

Dining Hall

data structures, greedy, implementation, sortings

Pushing Balls

brute force, dp, implementation

Treasure Hunt

implementation, math

Black Cat Collapse

Conditional Operators

constructive algorithms

Key of Like (Hard Version)

dp, math, probabilities

Key of Like (Easy Version)

dp, games, math, probabilities

Canteen (Hard Version)

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

Canteen (Easy Version)

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

Simple Permutation

constructive algorithms, number theory

Hamiltonian Partition

*special problem, *special problem

Nim with Special Numbers

*special problem, *special problem

Esports in Berland

*special problem, *special problem, greedy, greedy

Weapon Upgrade

*special problem, *special problem, dp

Color the Arrows

*special problem, *special problem, dp, dp

Uppercase or Lowercase?

*special problem, *special problem, interactive

Coin Game

*special problem, greedy

Showmatch

*special problem

Password Generator

*special problem

Online Palindrome

brute force, constructive algorithms, interactive

Zebra-like Numbers

bitmasks, brute force, constructive algorithms, dfs and similar, dp, greedy, math

Even String

brute force, combinatorics, dp, math, strings

Disappearing Permutation

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

Large Array and Segments

binary search, brute force, greedy

Cloudberry Jam

math

Serval and Colorful Array (Hard Version)

data structures, greedy

Serval and Colorful Array (Easy Version)

data structures, greedy

Serval and Modulo

constructive algorithms, math, number theory

Serval and Kaitenzushi Buffet

data structures, graph matchings, greedy

Serval and The Formula

bitmasks, constructive algorithms, dp, greedy

Serval and Final MEX

constructive algorithms, implementation

Serval and String Theory

constructive algorithms, implementation

Turtle and Nediam 2

dp, greedy

Wish Upon a Satellite (Hard Version)

data structures, dp

Wish Upon a Satellite (Easy Version)

dp, games

Skyscape

constructive algorithms, data structures, greedy

Blossom

binary search, combinatorics, dp, implementation, math, two pointers

Arcology On Permafrost

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

You Soared Afar With Grace

constructive algorithms, data structures, greedy, implementation

MIN = GCD

greedy, math, number theory

Max and Mod

constructive algorithms, math

Floor or Ceil

brute force, greedy

Binary Matrix

constructive algorithms, greedy

Hard Formula (Hard Version)

math

Hard Formula

math, number theory

Hot Matrix

constructive algorithms, math

Quantifier

combinatorics, dp, implementation

MST in Modulo Graph

constructive algorithms, dsu, graphs, greedy, math, number theory, sortings, trees

Quaternary Matrix

bitmasks, constructive algorithms, greedy, implementation, matrices

Balancing

greedy

Math Division

bitmasks, dp, math, probabilities

Order Statistics

*special problem, binary search

Card Flip

*special problem

Best Runner

*special problem

Strong Connectivity Strikes Back

*special problem, constructive algorithms, graphs

Cute Subsequences

*special problem, sortings

Dreaming Is Not Harmful

*special problem

Arithmetic Exercise

*special problem, data structures, dp, greedy

Alice, Bob, And Two Arrays

*special problem, data structures, dp, games

Scammy Game Ad

dp, greedy, implementation

Vicious Labyrinth

constructive algorithms, graphs, greedy, implementation, math

Final Verdict

math

RGB Walking

bitmasks, chinese remainder theorem, dfs and similar, graphs, number theory

AND x OR

bitmasks, constructive algorithms, dp

Another Folding Strip

combinatorics, constructive algorithms, data structures, divide and conquer, dp, greedy, math

Maximum Polygon

brute force, data structures, greedy, implementation, math

Binary Subsequence Value Sum

combinatorics, data structures, dp, fft, math, matrices

Finding OR Sum

bitmasks, constructive algorithms, implementation, interactive, math

Breach of Faith

constructive algorithms, greedy, math, sortings

Beautiful Sequence Returns

binary search, brute force, data structures, implementation

XOR Matrix

bitmasks, combinatorics, dp, implementation, math

Equalization

bitmasks, brute force, dp, graphs, math

Two Colors

binary search, combinatorics, math

Array Recoloring

constructive algorithms, greedy

To Zero

greedy, math

Game With Triangles: Season 2

dp, geometry

Counting Necessary Nodes

bitmasks, divide and conquer, greedy, implementation, math

Empty Triangle

geometry, interactive, probabilities

Counting Points

brute force, data structures, geometry, implementation, two pointers

XOR and Triangle

bitmasks, brute force, geometry, greedy, probabilities

The Third Side

geometry, greedy, math

Draw a Square

geometry, implementation

Can You Reach There?

Boarding Queue

Book Sorting

Gathering Sharks

Squares on Grid Lines

Secret Lilies and Roses

interactive

Corrupted File

Hold the Star

Minus Operator

interactive

Tower of Hanoi

Cactus Connectivity

Three-Dimensional Embedding

Control Towers

I've Been Flipping Numbers for 300 Years and Calculated the Sum

binary search, brute force, combinatorics, divide and conquer, math, number theory

Goodbye, Banker Life

2-sat, bitmasks, combinatorics, constructive algorithms, fft, math, number theory

Do You Love Your Hero and His Two-Hit Multi-Target Attacks?

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

For Wizards, the Exam Is Easy, but I Couldn't Handle It

brute force, greedy, implementation