D/D/D

dfs and similar, graphs, greedy, shortest paths

Hacking Numbers (Hard Version)

constructive algorithms, interactive, math, number theory

Hacking Numbers (Medium Version)

constructive algorithms, interactive, math, number theory

Hacking Numbers (Easy Version)

bitmasks, constructive algorithms, interactive, math, number theory

Slice to Survive

bitmasks, greedy, math

It's Time To Duel

implementation

Fallen Towers

binary search, greedy

Spruce Dispute

constructive algorithms, dfs and similar, graphs, greedy, implementation, shortest paths, trees

Needle in a Numstack

binary search, brute force, implementation, interactive

Neo's Escape

binary search, brute force, data structures, dp, dsu, graphs, greedy, implementation

SUMdamental Decomposition

bitmasks, constructive algorithms, greedy, implementation, math

Permutation Warm-Up

combinatorics, greedy, math

Cycling (Hard Version)

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

Cycling (Easy Version)

binary search, brute force, dp, greedy

Ain and Apple Tree

binary search, constructive algorithms, greedy, math, trees

Apple Tree Traversing

brute force, dfs and similar, greedy, implementation, trees

Maximum Subarray Sum

binary search, constructive algorithms, dp, implementation, math

Apples in Boxes

games, greedy, math

LRC and VIP

greedy, number theory

Baudelaire (hard version)

binary search, dfs and similar, divide and conquer, implementation, interactive, trees

Baudelaire (easy version)

binary search, constructive algorithms, divide and conquer, greedy, interactive, trees

Goblin

dfs and similar, dp, dsu, greedy, math

Wolf

binary search, greedy, math

Flower Boy

binary search, dp, greedy, two pointers

Cherry Bomb

greedy, math, sortings

St. Chroma

constructive algorithms, greedy, math

Dr. TC

brute force, math

Modulo 3

data structures, divide and conquer, dsu, graphs, trees

Numbers and Strings

binary search, brute force, dfs and similar, dp, implementation, math

Unpleasant Strings

binary search, dp, greedy, strings

Array and GCD

binary search, greedy, math, number theory

Card Game

brute force, constructive algorithms, games, greedy, math

Move to the End

brute force, data structures, dp, greedy, implementation

Three Decks

math

Maximize Nor

bitmasks, data structures, dp, implementation, sortings

Keep the Sum

constructive algorithms, implementation, two pointers

Local Construction

constructive algorithms, dfs and similar, implementation, two pointers

Median Splits

binary search, greedy, implementation, sortings

Binary Typewriter

greedy, math

Common Multiple

brute force, greedy, implementation, math

The Picky Cat

implementation, sortings

Dinner Time

constructive algorithms, math

Shoo Shatters the Sunshine

combinatorics, dp, trees

Kia Bakes a Cake

data structures, dp, greedy, trees

Mani and Segments

data structures, implementation, sortings, two pointers

23 Kingdom

binary search, brute force, data structures, greedy, ternary search, two pointers

Quartet Swapping

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

Mex in the Grid

constructive algorithms, implementation

Sasha and the Apartment Purchase

math, sortings

Vadim's Collection

brute force, greedy

Lost Luggage

dp, flows

Clearing the Snowdrift

data structures, dfs and similar, dp, greedy

Homework

bitmasks, math, matrices

Bermuda Triangle

chinese remainder theorem, geometry, implementation, math, number theory

Baggage Claim

combinatorics, dfs and similar, dp, dsu, graphs, implementation, math, trees

Sports Betting

2-sat, brute force, math, sortings

Wonderful XOR Problem

bitmasks, combinatorics, dp, fft, math

Wonderful Guessing Game

bitmasks, constructive algorithms, interactive

Wonderful Impostors

data structures, implementation, two pointers

Wonderful Teddy Bears

greedy, implementation, sortings

Wonderful Lightbulbs

combinatorics, constructive algorithms, math

Wonderful City

dp, implementation

Wonderful Gloves

greedy, math, sortings

Wonderful Sticks

constructive algorithms, greedy

Premiere at a Wrong Time

*special problem

Mysterious Script

*special problem, expression parsing, number theory

Blurry Vision

*special problem, fft, math

Definitely a Geometry Problem

*special problem, geometry

⅓ оf а Рrоblеm

*special problem, math

Pair Count

*special problem, number theory

Where Am I?

*special problem, geometry

Would It Be Unrated?

*special problem, binary search, brute force

Plinko

*special problem, games, interactive

Piecing It Together

*special problem, string suffix structures

La Vaca Saturno Saturnita

binary search, brute force, math, number theory

Chimpanzini Bananini

data structures, implementation, math

Trulimero Trulicina

constructive algorithms

Boneca Ambalabu

bitmasks

Tung Tung Sahur

greedy, strings, two pointers

Brr Brrr Patapim

math

Bobritto Bandito

brute force, constructive algorithms

Trippi Troppi

strings

Shorten the Array

binary search, bitmasks, data structures, dfs and similar, greedy, strings, trees, two pointers

Hackers and Neural Networks

bitmasks, brute force, greedy

Min Max MEX

binary search, brute force, greedy

Skibidi Table

bitmasks, implementation

Simple Repetition

math, number theory

Expensive Number

greedy, math

Ideal Generator

math

Andryusha and CCB

brute force, constructive algorithms, greedy, math, number theory, strings

She knows...

combinatorics, constructive algorithms, graphs, math

Mishkin Energizer

brute force, constructive algorithms, greedy, implementation, strings

Asuna and the Mosquitoes

constructive algorithms, greedy, math

Lady Bug

brute force, constructive algorithms, implementation, math

Kamilka and the Sheep

greedy, math, number theory, sortings

Gleb and Boating

brute force, constructive algorithms, data structures, dp, graphs, greedy, math, number theory, shortest paths

Igor and Mountain

binary search, brute force, dp

Interesting Ratio

brute force, math, number theory, two pointers

Place of the Olympiad

binary search, greedy, math

Combination Lock

constructive algorithms, greedy