Duff in Mafia

2-sat, binary search

Duff in the Army

data structures, trees

Duff in Beach

dp

Digits of Number Pi

dp, implementation, strings

Present for Vitalik the Philatelist

combinatorics, math, number theory

Lizard Era: Beginning

meet-in-the-middle

Alice, Bob, Oranges and Apples

number theory

Phillip and Trains

dfs and similar, graphs, shortest paths

Gennady the Dentist

brute force, implementation

Anton and Ira

constructive algorithms, greedy, math

Dima and Lisa

brute force, math, number theory

Marina and Vasya

constructive algorithms, greedy, strings

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

Kefa and Watch

data structures, hashing, strings

Kefa and Dishes

bitmasks, dp

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

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

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 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

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

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

Max and Min

geometry

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 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

Ann and Half-Palindrome

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

Vitaly and Cycle

combinatorics, dfs and similar, graphs, math

Arthur and Table

brute force, data structures, dp, greedy, math, sortings

Case of Computer Network

dfs and similar, graphs, trees

Case of a Top Secret

binary search, implementation, math

Case of Chocolate

data structures

Case of Fugitive

data structures, greedy, sortings

Kyoya and Train

dp, fft, graphs, math, probabilities

Nudist Beach

binary search, graphs, greedy

Love Triangles

dfs and similar, dsu, graphs

Kyoya and Permutation

binary search, combinatorics, constructive algorithms, greedy, implementation, math

Vanya and Brackets

brute force, dp, expression parsing, greedy, implementation, strings

Vanya and Triangles

brute force, combinatorics, data structures, geometry, math, sortings

Vanya and Scales

brute force, dp, greedy, math, meet-in-the-middle, number theory

GukiZ and GukiZiana

binary search, data structures, implementation

GukiZ and Binary Operations

combinatorics, implementation, math, matrices, number theory

GukiZ hates Boxes

binary search, greedy

ZgukistringZ

brute force, constructive algorithms, implementation, strings

Brackets in Implications

constructive algorithms, greedy, implementation, math

Regular Bridge

constructive algorithms, graphs, implementation

Degenerate Matrix

binary search, math

Happy Line

constructive algorithms, greedy, sortings

Yura and Developers

data structures, divide and conquer