Towers

dp, greedy, two pointers

Triangles

combinatorics, graphs, math

The Road to Berland is Paved With Good Intentions

2-sat, dfs and similar, dsu, graphs

Zigzag

data structures

Fractal Detector

dp, hashing

The table

constructive algorithms, greedy

Naughty Stone Piles

greedy

Unsolvable

math, number theory

Partial Sums

combinatorics, math, number theory

Two Strings

data structures, dp, strings

Decoding Genome

dp, matrices

Olympiad

binary search, greedy, sortings, two pointers

Little Elephant and Shifts

data structures

Blackboard Fibonacci

brute force, math

Martian Luck

math, number theory

Periodical Numbers

combinatorics, dp, number theory

Hot Days

greedy

Crosses

brute force, implementation

Relay Race

dp

Numbers

combinatorics, dp

Cowboys

combinatorics, dp, math

Pixels

constructive algorithms, math

Blood Cousins

binary search, data structures, dfs and similar, trees

Police Station

dp, graphs, shortest paths

Solitaire

dfs and similar, dp

The Beaver's Problem - 3

The Beaver's Problem - 3

The Beaver's Problem - 3

The Beaver's Problem - 3

The Beaver's Problem - 3

Game with Two Trees

Military Trainings

Beaver's Calculator 1.0

greedy

Little Elephant and Furik and Rubik

math, probabilities

Fragile Bridges

dp

Special Olympics

geometry

Infinite Maze

dfs and similar, graphs

Building Forest

data structures, dsu, graphs

Analyzing Polyline

geometry, math, sortings

Xor

brute force

Fools and Roads

data structures, dfs and similar, trees

Counter Attack

data structures, dsu, graphs, hashing, sortings

Non-Secret Cypher

two pointers

Weak Memory

dfs and similar, dsu

Optimal Sum

data structures, greedy

Name

greedy, strings

The Beaver's Problem - 2

The Beaver's Problem - 2

Magic Squares

Magic Squares

Smart Beaver and Resolving Collisions

Smart Beaver and Resolving Collisions

Space Voyage

binary search

Playing with Superglue

combinatorics, constructive algorithms

Spiral Maximum

brute force, dp

MYSTERIOUS LANGUAGE

*special problem

A Piece of Cake

*special problem, implementation

Polygons

geometry, sortings

Beard Graph

data structures, dsu, trees

Ancient Berland Hieroglyphs

two pointers

Conveyor

sortings, two pointers

Lemmings

binary search

Truncatable primes

*special problem

Non-decimal sum

*special problem

Remove digits

*special problem

Phone Talks

*special problem, dp, sortings

Cipher

combinatorics, dp

Euclidean Distance

*special problem

Date Change

*special problem

Coloring Brackets

dp

Porcelain

dp

Lucky Subsequence

combinatorics, dp, math

Missile Silos

data structures, dfs and similar, graphs, shortest paths

Digits Permutations

greedy

Last Chance

data structures, implementation, strings

Palindromes

dp, strings

Zero-One

constructive algorithms, games, greedy

Pairs of Numbers

brute force, dfs and similar, math, number theory

Constants in the language of Shakespeare

constructive algorithms, dp, greedy

Piet

implementation

Present to Mom

binary search, two pointers

Numbers

constructive algorithms, implementation

Games with Rectangle

combinatorics, dp

String

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

E-reader Display

constructive algorithms, greedy

Hot Bath

binary search, brute force, math

Lucky Permutation

brute force, combinatorics, number theory

Minimum Sum

divide and conquer, geometry, sortings

Education Reform

dp

Before Exam

constructive algorithms, implementation, sortings

Bertown roads

dfs and similar, graphs

Fancy Number

brute force, greedy, sortings, strings

Cycle

dfs and similar, graphs

Petr#

brute force, data structures, hashing, strings

Petya and Spiders

bitmasks, dp, dsu

Petya and Divisors

binary search, data structures, number theory

Lucky Sorting

constructive algorithms, sortings

Lucky Tree

dp, dsu, trees

Lucky Probability

brute force, probabilities

Space Rescuers

geometry, ternary search