Olha and Igor

interactive, probabilities, trees

Yurii Can Do Everything

binary search, bitmasks, brute force, constructive algorithms, divide and conquer, two pointers

Powerful Ksenia

bitmasks, constructive algorithms, math

Engineer Artem

2-sat, chinese remainder theorem, constructive algorithms, fft, flows

Death DBMS

data structures, string suffix structures, strings, trees

Emotional Fishermen

combinatorics, dp, math, two pointers

Make It Increasing

binary search, constructive algorithms, data structures, dp, implementation

Sum Over Subsets

combinatorics, math, number theory

Complicated Computations

binary search, data structures, two pointers

A Convex Game

dsu, games

Reducing Delivery Cost

brute force, graphs, shortest paths

Zero Remainder Sum

dp

Zero-XOR Array

*special problem, dp

Cyclic Shifts

*special problem, strings

Rogue-like Game

*special problem, brute force, greedy, two pointers

Number Deletion Game

*special problem, dp, games, greedy

Neural Network Problem

*special problem, binary search, greedy

Chess Match

*special problem

Yet Another DAG Problem

bitmasks, dfs and similar, dp, flows, graphs, math

Realistic Gameplay

dp, greedy

Rotary Laser Lock

binary search, interactive

Lucky Numbers (Hard Version)

dp, greedy

Lucky Numbers (Easy Version)

dp, greedy

Fruit Sequences

binary search, data structures, divide and conquer, dp, two pointers

Carrots for Rabbits

binary search, data structures, greedy, math, sortings

Prison Break

binary search, games, geometry, ternary search

One Billion Shades of Grey

flows, graphs

Boring Card Game

data structures, greedy, trees

Xum

bitmasks, constructive algorithms, math, matrices, number theory

Unshuffling a Deck

constructive algorithms, implementation

The Hard Work of Paparazzi

dp

Number of Subsequences

combinatorics, dp, strings

Impressive Harvesting of The Orchard

data structures

Excitation of Atoms

greedy, implementation

Danger of Mad Snakes

combinatorics, dp, math

Captain of Knights

math

Blue and Red of Our Faculty!

divide and conquer, dp

Ancient Language

graphs, sortings

BubbleSquare Tokens

Milutin's Plums

interactive

Light switches

meet-in-the-middle

Bubble Cup hypothesis

bitmasks, constructive algorithms, dp, math

Lookup Tables

bitmasks

Virus

data structures, divide and conquer, dsu, graphs

Growing flowers

data structures

Coins

math

5G Antenna Towers

geometry

Does anyone else hate the wind?

Dušan's Railway

divide and conquer, graphs, trees

Wakanda Forever

Boring Queries

data structures, math, number theory

Minlexes

dp, greedy, implementation, strings

Returning Home

graphs, shortest paths, sortings

Swedish Heroes

brute force, dp, implementation

Battle Lemmings

dp, greedy

Pokémon Army (hard version)

data structures, divide and conquer, dp, greedy, implementation

Rain of Fire

binary search, data structures, dfs and similar, dsu, graphs, implementation

Decryption

constructive algorithms, implementation, math, number theory

Three Occurrences

data structures, divide and conquer, hashing, two pointers

Equal Product

data structures, math, number theory, two pointers

Expected Damage

binary search, combinatorics, probabilities

Trash Problem

data structures, implementation

Showing Off

flows, graph matchings, greedy, implementation

Split

binary search, data structures, dp, greedy

Graph and Queries

data structures, dsu, graphs, implementation, trees

XOR Inverse

bitmasks, data structures, divide and conquer, dp, greedy, math, sortings, strings, trees

Make Them Equal

constructive algorithms, greedy, math

Cakes for Clones

dp

New Game Plus!

constructive algorithms, greedy, math

XOR-gun

bitmasks, brute force, constructive algorithms

Roads and Ramen

data structures, trees

Solo mid Oracle

greedy, math, ternary search

No Game No Life

bitmasks, games, math, matrices

The Thorny Path

greedy, math

Poman Numbers

bitmasks, greedy, math, strings

Grime Zoo

brute force, greedy, implementation, strings

Subsequences of Length Two

dp, strings

Bitwise Magic

dp, math

Rainbow Triples

binary search, data structures, flows, greedy

Clusterization Counting

combinatorics, dp, dsu, fft, graphs, trees

Two Different

constructive algorithms, divide and conquer

Avoid Rainbow Cycles

data structures, dsu, graphs, greedy, sortings, trees

Searchlights

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

Egor in the Republic of Dagestan

constructive algorithms, dfs and similar, dp, graphs, greedy, shortest paths

Discrete Centrifugal Jumps

data structures, dp, graphs

Deleting Numbers

interactive, math, number theory

Three Sequences

constructive algorithms, data structures, greedy, math

Bricks

flows, graph matchings, graphs

Game of Pairs

constructive algorithms, dfs and similar, interactive, math, number theory

Fixed Point Removal

binary search, constructive algorithms, data structures, greedy, two pointers

Chess Rush

*special problem, combinatorics, dp, implementation, math

Spring cleaning

*special problem, data structures, dfs and similar, graphs, trees

The Potion of Great Power

*special problem, 2-sat, binary search, data structures, graphs, interactive, sortings, two pointers

Star Trek

*special problem, combinatorics, dfs and similar, dp, games, graphs, matrices, trees

Roads

*special problem, geometry, sortings

Reverse and Swap

binary search, bitmasks, data structures

Divide Square

data structures, geometry, implementation, sortings

Mercenaries

bitmasks, brute force, combinatorics, dp, dsu, math, two pointers

x-prime Substrings

brute force, dfs and similar, dp, string suffix structures, strings

Clear the Multiset

data structures, divide and conquer, dp, greedy