Runner's Problem

dp, matrices, sortings

Water Taps

binary search, greedy, sortings

Cheese Board

Cashback

data structures, dp, greedy, math

Buy a Ticket

data structures, graphs, shortest paths

Sleepy Game

dfs and similar, dp, games, graphs

A Determined Cleanup

math

Segments

data structures

Mobile Communications

SUM and REPLACE

brute force, data structures, dsu, number theory

Connected Components?

data structures, dfs and similar, dsu, graphs

Congruence Equation

chinese remainder theorem, math, number theory

Jamie and Binary Sequence (changed after round)

bitmasks, greedy, math

Fishes

data structures, graphs, greedy, probabilities, shortest paths

Stack Sorting

constructive algorithms, data structures, greedy, implementation

Colorful Points

data structures, greedy, implementation

Maximum Questions

data structures, dp, strings

Unusual Sequences

bitmasks, combinatorics, dp, math, number theory

Letters Removing

data structures, strings

Segments Removal

data structures, dsu, flows, implementation, two pointers

Ithea Plays With Chtholly

binary search, constructive algorithms, games, greedy, interactive

String Mark

combinatorics, math, strings

Square Subsets

bitmasks, combinatorics, dp, math

Ralph and Mushrooms

dp, graphs

Counting Arrays

combinatorics, dp, math, number theory

Gluttony

constructive algorithms, greedy

Restoration of string

constructive algorithms, graphs, implementation

Danil and a Part-time Job

bitmasks, data structures, trees

Olya and Energy Drinks

data structures, dfs and similar, graphs, shortest paths

National Property

2-sat, dfs and similar, graphs, implementation

Something with XOR Queries

brute force, interactive, probabilities

Fire

dp, sortings

Turn Off The TV

data structures, sortings

Mahmoud and Ehab and the function

binary search, data structures, sortings

Mahmoud and Ehab and the binary string

binary search, divide and conquer, interactive

Desk Disorder

combinatorics, dfs and similar, dsu, graphs, trees

Third Month Insanity

dp, probabilities, trees

Helga Hufflepuff's Cup

dp, trees

Boredom

data structures

Casinos and travel

dp

Exploration plan

binary search, flows, graph matchings, shortest paths

Property

greedy, sortings

Neural Network country

dp, matrices

Arpa and a list of numbers

implementation, number theory

Berland Elections

greedy, sortings

Interactive LowerBound

brute force, interactive, probabilities

Vitya and Strange Lesson

binary search, data structures

Ilya And The Tree

dfs and similar, graphs, math, number theory, trees

Leha and another game about graph

constructive algorithms, data structures, dfs and similar, dp, graphs

Diverging Directions

data structures, dfs and similar, trees

Vasya's Function

binary search, implementation, math

Round Subset

dp, math

DNA Evolution

data structures, strings

Okabe and El Psy Kongroo

dp, matrices

Level Generation

binary search, math, ternary search

Sofa Thief

brute force, implementation

Choosing The Commander

bitmasks, data structures, trees

An overnight dance in discotheque

dfs and similar, dp, geometry, greedy, trees

Vladik and Favorite Game

constructive algorithms, dfs and similar, graphs, interactive

Coprime Subsequences

bitmasks, combinatorics, number theory

Roma and Poker

dp, graphs

Send the Fool Further! (medium)

dp, trees

Marmots (easy)

math

Field expansion

brute force, dp, meet-in-the-middle

Array Queries

brute force, data structures, dp

Broken BST

data structures, dfs and similar

Police Stations

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

Presents in Bankopolis

dp, graphs, shortest paths

Divide by Three

dp, greedy, math, number theory

Weird journey

combinatorics, constructive algorithms, dfs and similar, dsu, graphs

Berzerk

dfs and similar, dp, games

BF Calculator

*special problem

Twisted Circuit

*special problem, brute force, implementation

Kids' Riddle

*special problem

Underground Lab

constructive algorithms, dfs and similar, graphs

Hanoi Factory

brute force, data structures, dp, greedy, sortings

The Holmes Children

math, number theory

The Door Problem

2-sat, dfs and similar, dsu, graphs

Bars

*special problem, binary search

Stepan's Series

*special problem, dp

Significant Cups

*special problem, binary search, data structures, two pointers

Amusement Park

*special problem, ternary search

Dynamic Problem Scoring

brute force, greedy

Bear and Tree Jumps

dfs and similar, dp, trees

Game of Stones

bitmasks, dp, games

Cartons of milk

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

Garland

dfs and similar, graphs, greedy, trees

The Queue

brute force, greedy

Mahmoud and a xor trip

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

Mahmoud and a Dictionary

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

Timofey and rectangles

constructive algorithms, geometry

Two strings

binary search, hashing, strings, two pointers

Dasha and Puzzle

constructive algorithms, dfs and similar, graphs, greedy, trees

Ability To Convert

constructive algorithms, dp, greedy, math, strings

PolandBall and Polygon

data structures

Fedor and coupons

binary search, data structures, greedy, sortings

Leaving Auction

binary search, data structures

Santa Claus and Tangerines

binary search, data structures, greedy, two pointers

Santa Claus and a Palindrome

constructive algorithms, data structures, greedy

New Roads

constructive algorithms, graphs, trees