Crunching Numbers Just for You

*special problem, implementation

Twisted Circuit

*special problem, brute force, implementation

Touchy-Feely Palindromes

*special problem, implementation

Kids' Riddle

*special problem

Underground Lab

constructive algorithms, dfs and similar, graphs

Innokenty and a Football League

2-sat, graphs, greedy, implementation, shortest paths, strings

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

Felicity is Coming!

data structures, hashing, sortings, strings

PolandBall and Polygon

data structures

Fedor and coupons

binary search, data structures, greedy, sortings

New Year and Fireworks

brute force, data structures, dfs and similar, dp, implementation

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

Numbers Exchange

greedy, implementation, math

Hongcow's Game

bitmasks, divide and conquer, interactive

Alyona and a tree

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

Anton and Tree

dfs and similar, dp, trees

Sockets

greedy, sortings

Video Cards

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

Bottles

dp

Olympiad in Programming and Sports

dp, flows, graphs, greedy

Bulmart

binary search, dfs and similar

Subordinates

constructive algorithms, data structures, graphs, greedy, sortings

Dense Subsequence

data structures, greedy, strings

Generating Sets

binary search, data structures, dfs and similar, greedy, strings, trees

Maxim and Array

constructive algorithms, data structures, greedy, math

Closing ceremony

greedy

Paint it really, really dark gray

dfs and similar

Dexterina’s Lab

games, matrices, probabilities

Directed Roads

combinatorics, dfs and similar, graphs, math

Generate a String

dfs and similar, dp

Recover the String

constructive algorithms, greedy, implementation, math

Mishka and Interesting sum

data structures

Chris and Road

geometry, implementation

Analysis of Pathes in Functional Graph

data structures, graphs

Road to Post Office

math

As Fast As Possible

binary search, math

PLEASE

combinatorics, dp, implementation, math, matrices

Xor-sequences

matrices

The Wall (hard)

dp

Mike and Geometry Problem

combinatorics, data structures, dp, geometry, implementation

Friends and Subsequences

binary search, data structures

The Values You Can Make

dp

Kay and Snowflake

data structures, dfs and similar, dp, trees

Exchange of Books

*special problem

The Fraction

*special problem

Alyona and Strings

dp, strings

Gifts by the List

constructive algorithms, dfs and similar, graphs, trees

Theseus and labyrinth

graphs, implementation, shortest paths

Money Transfers

constructive algorithms, data structures, greedy, sortings

Robin Hood

binary search, greedy

World Tour

graphs, shortest paths

Beautiful Subarrays

data structures, divide and conquer, strings, trees

International Olympiad

constructive algorithms, greedy, implementation, math

Primes in Interval

*special problem

Divisibility Check

*special problem

Maximal Difference

*special problem

Array Sum

*special problem

Seasons

*special problem

Number of Parallelograms

geometry

Polycarp and Hay

dfs and similar, dsu, graphs, greedy, sortings

You're a Professional

*special problem

Ace It!

*special problem

Out of Controls

*special problem

Rosetta Problem

*special problem

Without Text

*special problem

Da Vinci Powers

*special problem

Bear and Up-Down

brute force, implementation

Image Preview

binary search, brute force, dp, two pointers

Автобус

binary search, data structures, greedy, sortings

Собачки и миски

data structures, greedy, sortings

Hostname Aliases

*special problem, binary search, data structures, implementation, sortings, strings

Little Artem and Time Machine

data structures

Fibonacci-ish

brute force, dp, hashing, implementation, math

Spy Syndrome 2

data structures, dp, hashing, implementation, sortings, string suffix structures, strings

Longest Subsequence

brute force, math, number theory

Messenger

data structures, hashing, implementation, string suffix structures, strings

Area of a Star

geometry

Arrow

geometry

A rectangle

math