Okabe and City

dfs and similar, graphs, shortest paths

Mister B and Boring Game

games, greedy

Level Generation

binary search, math, ternary search

Sofa Thief

brute force, implementation

MEX Queries

binary search, data structures, trees

Choosing The Commander

bitmasks, data structures, trees

Karen and Supermarket

brute force, dp, trees

Karen and Test

brute force, combinatorics, constructive algorithms, math

An overnight dance in discotheque

dfs and similar, dp, geometry, greedy, trees

Bipartite Checking

data structures, dsu, graphs

Army Creation

binary search, data structures

Sagheer and Apple Tree

games, trees

Vladik and Favorite Game

constructive algorithms, dfs and similar, graphs, interactive

Glad to see you!

binary search, interactive

Anthem of Berland

dp, strings

Card Game

binary search, flows, graphs

Selling Souvenirs

binary search, dp, greedy, ternary search

Expected diameter of a tree

binary search, brute force, dfs and similar, dp, sortings, trees

Ice cream coloring

constructive algorithms, dfs and similar, greedy

Periodic RMQ Problem

data structures

Coprime Subsequences

bitmasks, combinatorics, number theory

Roma and Poker

dp, graphs

April Fools' Problem (medium)

binary search, flows, graphs

Send the Fool Further! (hard)

dfs and similar, dp, math, trees

Send the Fool Further! (medium)

dp, trees

Fake News (hard)

string suffix structures

Fake News (medium)

constructive algorithms, strings

Marmots (medium)

math

Marmots (easy)

math

Aquarium decoration

data structures, greedy, two pointers

Field expansion

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

Mike and distribution

constructive algorithms, sortings

Array Queries

brute force, data structures, dp

Broken BST

data structures, dfs and similar

Exam Cheating

binary search, dp

Police Stations

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

Labelling Cities

dfs and similar, graphs, hashing

Presents in Bankopolis

dp, graphs, shortest paths

Mice problem

geometry, implementation, math, sortings

Colored Balls

greedy, math, number theory

Divide by Three

dp, greedy, math, number theory

The Great Mixing

dfs and similar, graphs, shortest paths

Weird journey

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

Till I Collapse

data structures, divide and conquer

Legacy

data structures, graphs, shortest paths

Berzerk

dfs and similar, dp, games

Anton and Permutation

brute force, data structures

Anton and School - 2

combinatorics, dp, math, number theory

BF Calculator

*special problem

Twisted Circuit

*special problem, brute force, implementation

Kids' Riddle

*special problem

Axel and Marston in Bitland

bitmasks, dp, graphs, matrices

Underground Lab

constructive algorithms, dfs and similar, graphs

Peterson Polyglot

brute force, dfs and similar, dsu, hashing, strings, trees

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

Composing Of String

*special problem, dp

Repairing Of String

*special problem, constructive algorithms

Big Number and Remainder

*special problem, math, number theory

Significant Cups

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

Amusement Park

*special problem, ternary search

Prairie Partition

binary search, constructive algorithms, greedy, math

Dynamic Problem Scoring

brute force, greedy

Vulnerable Kerbals

constructive algorithms, dp, graphs, math, number theory

Bear and Company

dp

Bear and Tree Jumps

dfs and similar, dp, trees

Barrels and boxes

brute force, combinatorics, math, number theory, probabilities

Game of Stones

bitmasks, dp, games

Jon and Orbs

dp, math, probabilities

Change-free

greedy

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

Tree Folding

dfs and similar, dp, greedy, implementation, trees

Timofey and rectangles

constructive algorithms, geometry

Radio stations

binary search, data structures

Maximum path

dp, greedy, implementation

Two strings

binary search, hashing, strings, two pointers

Dasha and Puzzle

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

Geometrical Progression

brute force, math, number theory

Ability To Convert

constructive algorithms, dp, greedy, math, strings

Bash Plays with Functions

brute force, combinatorics, dp, number theory

Felicity's Big Secret Revealed

bitmasks, dp

Bacterial Melee

brute force, combinatorics, dp, string suffix structures

Nikita and stack

data structures

PolandBall and White-Red graph

constructive algorithms, graphs, shortest paths

PolandBall and Polygon

data structures

Fedor and coupons

binary search, data structures, greedy, sortings

Vladik and chat

brute force, constructive algorithms, dp, implementation, strings

Interactive Bulls and Cows (Hard)

brute force, constructive algorithms, interactive

Inversions After Shuffle

data structures, probabilities

Leaving Auction

binary search, data structures

Santa Clauses and a Soccer Championship

constructive algorithms, dfs and similar, graphs, trees

Santa Claus and Tangerines

binary search, data structures, greedy, two pointers

Santa Claus and a Palindrome

constructive algorithms, data structures, greedy