Johnny and New Toy

data structures, implementation, math

James and the Chase

dfs and similar, graphs, probabilities, trees

Johnny and James

greedy, implementation, math, trees

Johnny and Megan's Necklace

binary search, bitmasks, constructive algorithms, dfs and similar, dsu, graphs

Johnny and Grandmaster

greedy, implementation, math, sortings

Johnny and Contribution

constructive algorithms, graphs, greedy, sortings

Binary Median

binary search, bitmasks, brute force, constructive algorithms

A/B Matrix

constructive algorithms, greedy, math

Spy-string

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

Polygon

dp, graphs, implementation, shortest paths

Buying Shovels

math, number theory

Similar Pairs

constructive algorithms, graph matchings, greedy, sortings

Honest Coach

greedy, sortings

Minimal Square

greedy, math

RC Kaboom Show

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

Modular Stability

combinatorics, math, number theory

Yet Another Yet Another Task

data structures, dp, implementation, two pointers

Mixing Water

binary search, math

New Theatre Square

brute force, dp, greedy, implementation, two pointers

Berland Poker

brute force, greedy, math

Tasty Cookie

binary search, constructive algorithms, greedy, implementation

Are You Fired?

constructive algorithms, data structures, greedy, implementation

The Best Vacation

binary search, brute force, greedy, implementation, two pointers

Celex Update

math

Maria Breaks the Self-isolation

greedy, sortings

Park Lighting

greedy, math

Root of quantum Fourier transform

*special problem

Power of quantum Fourier transform

*special problem

Quantum Classification - Dataset 7

*special problem

Quantum Classification - Dataset 6

*special problem

Quantum Classification - Dataset 5

*special problem

Quantum Classification - Dataset 4

*special problem

Quantum Classification - Dataset 3

*special problem

Prepare superposition of basis states with the same parity

*special problem

Prepare superposition of basis states with 0s

*special problem

"Is the number divisible by 3?" oracle

*special problem

"Is the bit string balanced?" oracle

*special problem

Distinguish Y, XZ, -Y and -XZ

*special problem

Distinguish four Pauli gates

*special problem

Distinguish Rz(θ) from Ry(θ)

*special problem

Distinguish Rz from R1

*special problem

Distinguish H from X

*special problem

Distinguish I, CNOTs and SWAP

*special problem

Figure out direction of CNOT

*special problem

Quantum Classification - 2

*special problem

Quantum Classification - 1

*special problem

Prepare state |01⟩ + |10⟩ + |11⟩

*special problem

Decrement

*special problem

Increment

*special problem

Distinguish Z from -Z

*special problem

Distinguish I ⊗ X from CNOT

*special problem

Distinguish Z from S

*special problem

Distinguish I from Z

*special problem

Distinguish I from X

*special problem

Guess Divisors Count

constructive algorithms, interactive, number theory

Restorer Distance

binary search, greedy, math, sortings, ternary search

Game With Array

constructive algorithms, math

Count Triangles

binary search, implementation, math, two pointers

Young Explorers

dp, greedy, sortings

Sequence with Digits

brute force, implementation, math

Find a Gift

binary search, interactive, probabilities

Summoning Minions

constructive algorithms, dp, flows, graph matchings, greedy, sortings

Graph Coloring

dfs and similar, dp, graphs

Multiset

binary search, data structures

Not So Simple Polygon Embedding

binary search, brute force, geometry, math

Simple Polygon Embedding

binary search, geometry, math, ternary search

Ternary String

binary search, dp, implementation, two pointers

Alarm Clock

math

Decreasing Heights

brute force, dp

K-periodic Garland

brute force, dp, greedy

Constructing the Array

constructive algorithms, data structures, sortings

Board Moves

math

Two Arrays And Swaps

greedy, sortings

Most Unstable Array

constructive algorithms, greedy, math

Special Permutation

constructive algorithms

Binary String Reconstruction

constructive algorithms, dfs and similar, math

Special Elements

brute force, implementation, two pointers

Alice, Bob and Candies

implementation

K-th Not Divisible by n

binary search, math

Same Parity Summands

constructive algorithms, math

Sum of Round Numbers

implementation, math

Skier

data structures, implementation

Square?

brute force, implementation, math

A+B (Trial Problem)

implementation

Orac and Models

dp, math, number theory

Orac and Factors

math

Slime and Sequences (Hard Version)

dp, fft, math

Slime and Sequences (Easy Version)

dp, fft, math

Slime and Hats

constructive algorithms, dp, greedy

Slime and Biscuits

math, probabilities

Orac and Game of Life

dfs and similar, graphs, implementation, shortest paths

Orac and Medians

constructive algorithms, greedy, math

Orac and LCM

data structures, math, number theory

Phoenix and Memory

data structures, dfs and similar, graphs, greedy

Phoenix and Berries

brute force, dp, greedy, math

Phoenix and Science

binary search, constructive algorithms, greedy, implementation, math

Phoenix and Distribution

constructive algorithms, greedy, sortings, strings

Phoenix and Beauty

constructive algorithms, data structures, greedy, sortings

Phoenix and Balance

greedy, math

Pac-Man 2.0

*special problem, dp