The World is a Theatre

combinatorics, math

Opposites Attract

implementation, math

cAPS lOCK

implementation, strings

Date calculation

*special problem

Array sorting

*special problem, sortings

Balanced brackets

*special problem

CAPS LOCK ON

*special problem

Prime factorization

*special problem

Tribonacci numbers

*special problem

Exponentiation

*special problem

Decimal sum

*special problem

Gnikool Ssalg

*special problem, implementation, strings

Hexagonal numbers

*special problem, implementation

Students and Shoelaces

brute force, dfs and similar, graphs, implementation

Cookies

implementation

Birthday

geometry, math

Numbers

constructive algorithms, implementation

Games with Rectangle

combinatorics, dp

String

brute force, constructive algorithms, hashing, implementation, string suffix structures, strings

Statues

dfs and similar

Canvas Frames

implementation

Wasted Time

geometry

Pills

brute force, flows

Fibonacci Sums

dp, math

E-reader Display

constructive algorithms, greedy

Password

binary search, dp, hashing, string suffix structures, strings

Hot Bath

binary search, brute force, math

MST Company

binary search, graphs

Two progressions

constructive algorithms, greedy

Hobbits' Party

constructive algorithms, greedy

Simple XML

implementation

Measuring Lengths in Baden

math

Permutations

brute force, combinatorics, implementation

The number of positions

math

Maze

dfs and similar, dp, probabilities, trees

String

string suffix structures

Brackets

combinatorics, dp, greedy

Squares

math

Prime Permutation

implementation, number theory, strings

Lucky Substring

brute force, implementation

Lucky Division

brute force, number theory

Lucky Array

data structures

Lucky Segments

binary search, implementation, two pointers

Lucky Permutation

brute force, combinatorics, number theory

Lucky Transformation

strings

Lucky Sum

implementation

Minimum Sum

divide and conquer, geometry, sortings

Luck is in Numbers

greedy

Brevity is Soul of Wit

graph matchings

Boom

implementation

Spiders

dp, greedy, trees

Put Knight!

games, math

Three Sons

brute force

Winnie-the-Pooh and honey

implementation, math

Quiz League

implementation

Elevator

brute force, implementation, math

Alternative Reality

geometry

String Transformation

hashing, strings

Education Reform

dp

Before Exam

constructive algorithms, implementation, sortings

Epic Game

implementation

Bertown roads

dfs and similar, graphs

Caesar's Legions

dp

Fancy Number

brute force, greedy, sortings, strings

Present from Lena

constructive algorithms, implementation

String Task

implementation, strings

Tree or not Tree

data structures, divide and conquer, implementation, trees

Not Quick Transformation

divide and conquer, math

Cycle

dfs and similar, graphs

Very Interesting Game

brute force, number theory

Elevator

implementation, math

Little Pigs and Wolves

greedy, implementation

Tram

implementation

Linear Kingdom Races

data structures, dp

Unambiguous Arithmetic Expression

dp, expression parsing

Plumber

math

Lawnmower

greedy, sortings

Party

dfs and similar, graphs, trees

PFAST Inc.

bitmasks, brute force, graphs

Cifera

math

Sleeping

combinatorics, implementation, math

Museum

math, matrices, probabilities

Double Happiness

brute force, math, number theory

Petr#

brute force, data structures, hashing, strings

Grammar Lessons

implementation, strings

Petya and Square

implementation, math

Petya and Strings

implementation, strings

Petya and Rectangle

Petya and Coloring

combinatorics, dp

Petya and Spiders

bitmasks, dp, dsu

Petya and Divisors

binary search, data structures, number theory

Petya and Inequiations

greedy

Lucky String

constructive algorithms, strings

Nearly Lucky Number

implementation

Lucky Interval

brute force, math

Lucky Sorting

constructive algorithms, sortings

Lucky Tree

dp, dsu, trees

Lucky Probability

brute force, probabilities

Lucky Sum of Digits

brute force, implementation

Datatypes

math, sortings