Broken BST

data structures, dfs and similar

Minimal string

data structures, greedy, strings

Sequence Recovery

bitmasks, data structures, greedy

Exam Cheating

binary search, dp

Police Stations

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

Bank Hacking

constructive algorithms, data structures, dp, trees

Replace All

combinatorics, dp, math

Leha and security system

data structures

Choosing Carrot

games, math

Labelling Cities

dfs and similar, graphs, hashing

Naming Company

games, greedy, sortings

Oleg and chess

data structures, divide and conquer, flows, graph matchings

Julia the snail

data structures, divide and conquer, dp

Problem of offices

constructive algorithms, dfs and similar, dp, trees

Presents in Bankopolis

dp, graphs, shortest paths

Mice problem

geometry, implementation, math, sortings

Igor and his way to work

dfs and similar, graphs, implementation, shortest paths

Mages and Monsters

data structures, geometry

Colored Balls

greedy, math, number theory

Paths in a Complete Binary Tree

bitmasks, trees

Divide by Three

dp, greedy, math, number theory

Masha and geometric depression

brute force, implementation, math

New task

data structures

Finding lines

constructive algorithms, divide and conquer, interactive

The Great Mixing

dfs and similar, graphs, shortest paths

Weird journey

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

Functions again

dp, two pointers

ALT

data structures, flows, graphs, trees

Rap God

data structures, dfs and similar, hashing, strings, trees

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

Anton and Fairy Tale

binary search, math

BF Calculator

*special problem

Crunching Numbers Just for You

*special problem, implementation

Twisted Circuit

*special problem, brute force, implementation

Touchy-Feely Palindromes

*special problem, implementation

INTERCALC

*special problem, implementation

Kids' Riddle

*special problem

Numbers Joke

*special problem

Intranet of Buses

binary search, geometry, implementation, two pointers

Andryusha and Nervous Barriers

data structures, dp

Axel and Marston in Bitland

bitmasks, dp, graphs, matrices

Underground Lab

constructive algorithms, dfs and similar, graphs

Innokenty and a Football League

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

Andryusha and Colored Balloons

dfs and similar, graphs, greedy, trees

The Meeting Place Cannot Be Changed

binary search

Selling Numbers

dp, sortings

Parquet Re-laying

constructive algorithms

Peterson Polyglot

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

Bitwise Formula

bitmasks, brute force, dfs and similar, expression parsing, implementation

String Game

binary search, greedy, strings

Hanoi Factory

brute force, data structures, dp, greedy, sortings

Cloud of Hashtags

binary search, greedy, implementation, strings

Alyona and Spreadsheet

binary search, data structures, dp, greedy, implementation, two pointers

Sherlock and the Encrypted Data

bitmasks, combinatorics, dp

Sherlock's bet to Moriarty

constructive algorithms, data structures, divide and conquer, geometry, graphs, implementation, trees

The Holmes Children

math, number theory

The Door Problem

2-sat, dfs and similar, dsu, graphs

Molly's Chemicals

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

University Schedule

*special problem

Bars

*special problem, binary search

Stepan and Vowels

*special problem, implementation, strings

Stepan's Series

*special problem, dp

Composing Of String

*special problem, dp

Repairing Of String

*special problem, constructive algorithms

Perfectionist Arkadiy

*special problem, number theory

Pens And Days Of Week

*special problem, binary search, number theory

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

Test Data Generation

combinatorics, divide and conquer, dp, fft, math, number theory

Blog Post Rating

data structures, sortings

Perishable Roads

dp, graphs, shortest paths

Prairie Partition

binary search, constructive algorithms, greedy, math

Dynamic Problem Scoring

brute force, greedy

Success Rate

binary search, math

Verifying Kingdom

binary search, divide and conquer, interactive, trees

Varying Kibibits

bitmasks, dp

Vulnerable Kerbals

constructive algorithms, dp, graphs, math, number theory

Volatile Kite

geometry

Voltage Keepsake

binary search, math

Bear and Isomorphic Points

geometry, two pointers

Bear and Rectangle Strips

dp, greedy

Bear and Company

dp

Bear and Tree Jumps

dfs and similar, dp, trees

k-Interesting Pairs Of Integers

*special problem, bitmasks, brute force, meet-in-the-middle

Cycle In Maze

*special problem, dfs and similar, graphs, greedy, shortest paths

The Winds of Winter

binary search, data structures

Barrels and boxes

brute force, combinatorics, math, number theory, probabilities

Game of Stones

bitmasks, dp, games

Jon and Orbs

dp, math, probabilities

Jon Snow and his Favourite Number

brute force, dp, implementation, sortings

Code For 1

constructive algorithms, dfs and similar, divide and conquer

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