Permutation Problem (Hard Version)

brute force, data structures, hashing, math, number theory

Permutation Problem (Simple Version)

binary search, brute force, combinatorics, data structures, math, number theory

Non-academic Problem

dfs and similar, graphs, trees

Beautiful Array

greedy, math, number theory, sortings

Mathematical Problem

brute force, dp, greedy, implementation, math, two pointers

Update Queries

data structures, greedy, sortings

Matrix Stabilization

brute force, data structures, greedy, sortings

X Axis

brute force, geometry, math, sortings

Maximize the Largest Component (Hard Version)

data structures, dfs and similar, dp, dsu, implementation

Maximize the Largest Component (Easy Version)

brute force, data structures, dfs and similar, dsu, graphs, implementation

D-Function

combinatorics, math, number theory

Final Boss

binary search, data structures

Secret Box

brute force, combinatorics, math

Manhattan Circle

implementation, math

Good Prefixes

greedy

Maximum Multiple Sum

brute force, math, number theory

Creating Words

implementation, strings

Tower Capturing

combinatorics, dp, geometry

Magic Trick II

constructive algorithms, implementation, sortings

Reconstruction

brute force, dp, math

Shuffle

dp, greedy, trees

''a'' String Problem

brute force, hashing, implementation, math, string suffix structures, strings

Magnitude (Hard Version)

combinatorics, dp, greedy, math

Magnitude (Easy Version)

dp, greedy, math

Large Addition

implementation, math

Strange Splitting

constructive algorithms

Your Loss

bitmasks, brute force, dp, trees

array-value

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

I Love Balls

combinatorics, math, probabilities

Swap Dilemma

constructive algorithms, data structures, divide and conquer, greedy, math, sortings

Have Your Cake and Eat It Too

binary search, brute force, greedy, implementation

Corner Twist

constructive algorithms, greedy, implementation, math

Array Divisibility

constructive algorithms, math

Sorting Problem Again

binary search, data structures, sortings

Number of k-good subarrays

bitmasks, brute force, combinatorics, divide and conquer, dp, math, meet-in-the-middle

Beauty of the mountains

brute force, data structures, implementation, math, number theory

Boring Day

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

Collatz Conjecture

brute force, implementation, math, number theory

Soccer

greedy, implementation, math, sortings

Turtle and Paths on a Tree

data structures, dp, trees

Turtle and Intersected Segments

data structures, dsu, graphs, greedy

Turtle and Multiplication

constructive algorithms, dfs and similar, graphs, number theory

Turtle and an Incomplete Sequence

bitmasks, brute force, constructive algorithms, greedy, implementation, math

Turtle and an Infinite Sequence

bitmasks, math

Turtle and Piggy Are Playing a Game

brute force, greedy, math

Yasya and the Mysterious Tree

bitmasks, data structures, dfs and similar, graphs, greedy, strings, trees

Field Division (hard version)

math, sortings

Field Division (easy version)

data structures, math, sortings

Permutation of Rows and Columns

constructive algorithms, data structures, greedy, hashing, implementation, math, matrices, sortings

GCD-sequence

greedy, implementation, math, number theory

Sofia and the Lost Operations

constructive algorithms, greedy

Choosing Cubes

sortings, sortings

Problem Generator

math

Kostyanych's Theorem

brute force, constructive algorithms, graphs, interactive

Manhattan Triangle

binary search, constructive algorithms, data structures, geometry, implementation, two pointers

Fixing a Binary String

bitmasks, brute force, constructive algorithms, dp, greedy, hashing, strings

Earning on Bets

binary search, combinatorics, constructive algorithms, number theory

XOR Sequences

bitmasks, greedy

Guess the Maximum

brute force, greedy, implementation

Large Graph

data structures, dfs and similar, dsu, graphs, number theory, two pointers

Computing Machine

brute force, data structures, dp, greedy, implementation

Elections

data structures, greedy, implementation, math

Manhattan Permutations

constructive algorithms, data structures, greedy, implementation, math

New Bakery

binary search, greedy, math, ternary search

Alice and Books

constructive algorithms, greedy, sortings

Tensor

constructive algorithms, graphs, interactive

XORificator

bitmasks, brute force, greedy, hashing

Nikita and LCM

brute force, data structures, dp, greedy, math, number theory, sortings

Binary Colouring

bitmasks, constructive algorithms, greedy, math

Little Nikita

math

Remove Bridges

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

Splittable Permutations

combinatorics, data structures, dfs and similar, greedy, math, trees

Invertible Bracket Sequences

binary search, combinatorics, data structures, divide and conquer, implementation, two pointers

Job Interview

binary search, dp, greedy, implementation, two pointers

Increase/Decrease/Copy

greedy, implementation

Verify Password

implementation, sortings, strings

Mind Bloom

dp

378QAQ and Core

greedy, strings

Zimpha Fan Club

fft, greedy, math, strings

Set

bitmasks, brute force, combinatorics, dfs and similar, divide and conquer, dp, math

Chain Queries

binary search, data structures, dfs and similar, implementation, trees

Paint the Tree

brute force, dfs and similar, dp, greedy, shortest paths, trees

Chamo and Mocha's Array

binary search, brute force, greedy

378QAQ and Mocha's Array

brute force, greedy, math, sortings

Bazoka and Mocha's Array

brute force, greedy, implementation, sortings

Money Buys Less Happiness Now

data structures, greedy, sortings

Cutting Game

binary search, brute force, data structures, implementation, sortings, two pointers

Money Buys Happiness

dp

Ingenuity-2

constructive algorithms, greedy, implementation

Beautiful Triple Pairs

combinatorics, data structures

Symmetric Encoding

implementation, sortings, strings

Phone Desktop

greedy, math

Maximum GCD Sum Queries

bitmasks, brute force, dp, implementation, number theory

Cat, Fox and Swaps

graphs, math, sortings

Cat, Fox and Maximum Array Split

brute force, interactive, math

Cat, Fox and Double Maximum

constructive algorithms, greedy, implementation, math, sortings

Cat, Fox and the Lonely Array

binary search, bitmasks, data structures, greedy, math, two pointers

Chess For Three

brute force, dp, implementation, math

Coin Games

games

Contest Proposal

brute force, greedy, two pointers