Anton and Ira

constructive algorithms, greedy, math

Dima and Lisa

brute force, math, number theory

Marina and Vasya

constructive algorithms, greedy, strings

Kolya and Tanya

combinatorics

Olesya and Rodion

math

Robot's Task

greedy, implementation

Asphalting Roads

implementation

Boolean Function

bitmasks, dp, expression parsing

Number of Binominal Coefficients

dp, math, number theory

Superior Periodic Subarrays

number theory

Once Again...

constructive algorithms, dp, matrices

GCD Table

constructive algorithms, greedy, number theory

Zublicanes and Mumocrates

dp, trees, two pointers

Kojiro and Furrari

dp, greedy

Three Logos

bitmasks, brute force, constructive algorithms, geometry, implementation, math

Developing Skills

implementation, math, sortings

Luxurious Houses

implementation, math

Vasya the Hipster

implementation, math

Kefa and Watch

data structures, hashing, strings

Kefa and Dishes

bitmasks, dp

Kefa and Park

dfs and similar, graphs, trees

Kefa and Company

binary search, sortings, two pointers

Kefa and First Steps

brute force, dp, implementation

Finding Team Member

brute force, implementation, sortings

Raising Bacteria

bitmasks

Mirror Box

matrices, trees

Walking!

constructive algorithms, greedy

LCS Again

dp, greedy

Weakness and Poorness

ternary search

"Or" Game

brute force, greedy

A Problem about Polyline

geometry, math

Modulo Sum

combinatorics, data structures, dp, two pointers

Multiplication Table

implementation, number theory

Painting Edges

binary search, data structures

Flights for Regular Customers

dp, matrices

Points on Plane

constructive algorithms, divide and conquer, geometry, greedy, sortings

Invariance of Tree

constructive algorithms, dfs and similar, greedy, trees

Vasya and Petya's Game

math, number theory

Robots protection

data structures

Bots

combinatorics, dp, math, number theory

Run for beer

dfs and similar, shortest paths

Bulbo

dp, greedy

Spectator Riots

geometry

Tablecity

constructive algorithms, implementation

Party

bitmasks, brute force, graph matchings

Bribes

dfs and similar, graphs, trees

Fibonotci

data structures, math, matrices

Bear and Three Musketeers

brute force, dfs and similar, graphs, hashing

Bear and Elections

greedy, implementation

Bear and Bowling

data structures, greedy

Bear and Cavalry

data structures, divide and conquer, dp

Bear and Drawing

constructive algorithms, dfs and similar, trees

Bear and Blocks

binary search, data structures, dp, math

Bear and Poker

implementation, math, number theory

Order Book

data structures, greedy, implementation, sortings

Arrays

sortings

Geometric Progressions

math

Campus

binary search, data structures, dsu, trees

CNF 2

constructive algorithms, dfs and similar, graphs, greedy

Minimization

dp, greedy, sortings

Lengthening Sticks

combinatorics, implementation, math

Pig and Palindromes

combinatorics, dp

Tree Requests

binary search, bitmasks, constructive algorithms, dfs and similar, graphs, trees

Replacement

constructive algorithms, data structures, implementation

Simple Game

constructive algorithms, games, greedy, implementation, math

Elections

implementation

Inventory

greedy, math

Music

implementation, math

Longest Increasing Subsequence

data structures, dp

Sign Posts

brute force, geometry, math

New Language

2-sat, greedy

Symmetric and Transitive

combinatorics, dp, math

Primes or Palindromes?

brute force, implementation, math, number theory

Mausoleum

dp

President and Roads

dfs and similar, graphs, hashing, shortest paths

One-Dimensional Battle Ships

binary search, data structures, greedy, sortings

Geometric Progression

binary search, data structures, dp

Berland National Library

implementation

Lineland Mail

greedy, implementation

Max and Min

geometry

Clique in the Divisibility Graph

dp, math, number theory

Restoring Map

bitmasks, constructive algorithms, trees

Restructuring Company

data structures, dsu

Logistical Questions

dfs and similar, divide and conquer, trees

Replicating Processes

constructive algorithms, greedy

Matching Names

dfs and similar, strings, trees

Gerald is into Art

constructive algorithms, implementation

Currency System in Geraldion

implementation, sortings

Gerald and Path

dp, sortings

Randomizer

combinatorics, geometry, probabilities

Gerald and Giant Chess

combinatorics, dp, math, number theory

Equivalent Strings

divide and conquer, hashing, sortings, strings

Gerald's Hexagon

brute force, geometry, math

A Simple Task

data structures, sortings, strings

Guess Your Way Out! II

data structures, implementation, sortings

Amr and Chemistry

brute force, graphs, greedy, math, shortest paths

Amr and The Large Array

implementation

Lala Land and Apple Trees

brute force, implementation, sortings

Ann and Half-Palindrome

data structures, dp, graphs, string suffix structures, strings, trees

Vitaly and Cycle

combinatorics, dfs and similar, graphs, math