Gift Set

binary search, greedy, math, ternary search

Segment Intersections

brute force, greedy, implementation, math

Magic Gems

dp, math, matrices

The Winter Hike

constructive algorithms, greedy, math

Present

binary search, bitmasks, constructive algorithms, data structures, math, sortings

Valid Sets

dfs and similar, dp, math, trees

Guess The Maximums

binary search, implementation, interactive, math

Martial Arts Tournament

binary search, brute force, greedy, math

Watching Fireworks is Fun

data structures, dp, math

Height All the Same

combinatorics, constructive algorithms, math, matrices

Soldier and Traveling

flows, graphs, math

Longest Subsequence

brute force, math, number theory

Arena

combinatorics, dp, math

Monocarp and the Set

combinatorics, data structures, math

Beautiful Mirrors

data structures, dp, math, probabilities

Recovering BST

brute force, dp, math, number theory, trees

Permutation Shift

brute force, combinatorics, constructive algorithms, dfs and similar, dsu, graphs, math

Omkar and Duck

bitmasks, constructive algorithms, interactive, math

Timofey and Black-White Tree

brute force, dfs and similar, divide and conquer, graphs, greedy, math, shortest paths, trees

Decryption

constructive algorithms, implementation, math, number theory

Common Number

binary search, combinatorics, dp, math

Number of Components

combinatorics, data structures, dp, math

Game on Sum (Easy Version)

combinatorics, dp, games, math

Kirk and a Binary String (hard version)

data structures, greedy, math, strings

Send Boxes to Alice (Hard Version)

constructive algorithms, greedy, math, number theory, ternary search, two pointers

Counting Rhyme

dp, math, number theory

Mahmoud and a xor trip

bitmasks, constructive algorithms, data structures, dfs and similar, dp, math, trees

Red-Blue Operations (Easy Version)

binary search, greedy, implementation, math

Euclid's nightmare

bitmasks, dfs and similar, dsu, graphs, greedy, math, sortings

Potion Brewing Class

dfs and similar, math, number theory, trees

The LCMs Must be Large

bitmasks, brute force, constructive algorithms, math, number theory

Anya and Cubes

binary search, bitmasks, brute force, dp, math, meet-in-the-middle

ConstructOR

bitmasks, chinese remainder theorem, combinatorics, constructive algorithms, math, number theory

Domino (hard version)

constructive algorithms, implementation, math

Speedrun

brute force, dfs and similar, dp, graphs, greedy, math, sortings, two pointers

Promising String (hard version)

data structures, implementation, math, strings

Flexible String Revisit

combinatorics, dp, math, probabilities

You Are Given a WASD-string...

brute force, data structures, dp, greedy, implementation, math, strings

Guess Game

bitmasks, data structures, games, math, probabilities, sortings, strings, trees

Colorings and Dominoes

combinatorics, dp, greedy, math

Sad powers

binary search, math, number theory

Perfect Groups

dp, math, number theory

Counting Binary Strings

combinatorics, dp, math

Red-Black Number

dfs and similar, dp, implementation, math, meet-in-the-middle

Rain

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

Carry Bit

combinatorics, math

Space Harbour

data structures, implementation, math, sortings

Candy Party (Hard Version)

bitmasks, constructive algorithms, dp, greedy, implementation, math

Sand Fortress

binary search, constructive algorithms, math

Staircases

brute force, combinatorics, data structures, dfs and similar, dp, implementation, math

The Harmonization of XOR

bitmasks, constructive algorithms, greedy, math

Random Task

binary search, bitmasks, combinatorics, dp, math

The Holmes Children

math, number theory

Lengthening Sticks

combinatorics, implementation, math

Lipshitz Sequence

data structures, math

Assimilation IV

combinatorics, dp, math, probabilities, two pointers

Another Wine Tasting Event

combinatorics, constructive algorithms, math, strings

Vlad and the Nice Paths (easy version)

combinatorics, dp, math

Solo mid Oracle

greedy, math, ternary search

Lucky Subsequence

combinatorics, dp, math

Inverse Coloring

combinatorics, dp, math

Congruence Equation

chinese remainder theorem, math, number theory

Digits

dp, math, number theory

Addition Robot

data structures, math, matrices

Degenerate Matrix

binary search, math

Topforces Strikes Back

brute force, math, sortings

Key Storage

combinatorics, math

GukiZ and Binary Operations

combinatorics, implementation, math, matrices, number theory

Chip 'n Dale Rescue Rangers

binary search, geometry, math

Permutation recovery

constructive algorithms, data structures, dfs and similar, graphs, greedy, math, sortings

Light Bulbs (Easy Version)

brute force, combinatorics, dfs and similar, dp, dsu, graphs, math, trees

Nastya and a Game

brute force, implementation, math

Follow Traffic Rules

implementation, math

Vasya's Function

binary search, implementation, math

Devu and Birthday Celebration

combinatorics, dp, math

The Unbearable Lightness of Weights

dp, math

Nice table

brute force, constructive algorithms, greedy, math

Magic Trick

combinatorics, math, probabilities

Caisa and Tree

brute force, dfs and similar, math, number theory, trees

Below the Diagonal

constructive algorithms, greedy, math

Level Generation

binary search, math, ternary search

String Mark

combinatorics, math, strings

Frog Jumping

dfs and similar, math, number theory

Valera and Swaps

constructive algorithms, dsu, graphs, implementation, math, string suffix structures

Hidden Fortress

interactive, math

Playlist

math, probabilities, sortings

Hexagons

binary search, implementation, math

Blueprint for Seating

combinatorics, divide and conquer, math

Vasily the Bear and Beautiful Strings

combinatorics, math, number theory

Blackboard Fibonacci

brute force, math

Unsolvable

math, number theory

Graph

*special problem, binary search, dfs and similar, dp, math, ternary search

New York Hotel

greedy, math

Marmots (easy)

math

Cowboys

combinatorics, dp, math

Pixels

constructive algorithms, math

Powerful array

data structures, implementation, math, two pointers

Gerald and Giant Chess

combinatorics, dp, math, number theory

Multiples and Power Differences

constructive algorithms, graphs, math, number theory

Great Vova Wall (Version 1)

greedy, implementation, math