Block Towers

brute force, greedy, math, number theory

Cards

constructive algorithms, dp, math

K-special Tables

constructive algorithms, implementation

Guest From the Past

implementation, math

Graph and String

constructive algorithms, graphs

Optimal Number Permutation

constructive algorithms

Not Equal on a Segment

data structures, implementation

Wet Shark and Flowers

combinatorics, math, number theory, probabilities

Wet Shark and Bishops

combinatorics, implementation

Pearls in a Row

greedy

Constellation

geometry, implementation

Polyline

constructive algorithms, implementation

Watering Flowers

implementation

Chocolate

combinatorics

Longest k-Good Segment

binary search, data structures, two pointers

The Labyrinth

dfs and similar

Longtail Hedgehog

dp, graphs

Gena's Code

implementation, math

Link/Cut Tree

brute force, implementation

Skills

binary search, brute force, dp, greedy, sortings, two pointers

Peter and Snow Blower

binary search, geometry, ternary search

The Union of k-Segments

greedy, sortings

Replace To Make Regular Bracket Sequence

data structures, expression parsing, math

The Text Splitting

brute force, implementation, strings

New Year and Domino

dp, implementation

New Year and Old Property

bitmasks, brute force, implementation

Harmony Analysis

constructive algorithms

Vika and Squares

constructive algorithms, implementation

Load Balancing

implementation, math

Hamming Distance Sum

combinatorics, strings

Zuma

dp

Chain Reaction

binary search, dp

Testing Robots

implementation

Lazy Student

constructive algorithms, data structures, graphs

Sorting Railway Cars

constructive algorithms, greedy

More Cowbell

binary search, greedy

Moodular Arithmetic

combinatorics, dfs and similar, dsu, math, number theory

Alternative Thinking

dp, greedy, math

Approximating a Constant Range

dp, implementation, two pointers

The Two Routes

graphs, shortest paths

Make Palindrome

constructive algorithms, greedy, strings

Queries about less or equal elements

binary search, data structures, sortings, two pointers

Extract Numbers

implementation, strings

Spongebob and Squares

brute force, math

Day at the Beach

sortings

Spongebob and Joke

implementation

Igor In the Museum

dfs and similar, graphs, shortest paths

Queries on a String

implementation, strings

Subsequences

data structures, dp

Restaurant

dp, greedy, sortings

Divisibility

math

Wilbur and Points

combinatorics, greedy, sortings

Pasha and Phone

binary search, math

Anton and Lines

geometry, sortings

The Big Race

math

Median Smoothing

implementation

Duff in Love

math

Duff and Weight Lifting

greedy

Laurenty and Shop

implementation

Phillip and Trains

dfs and similar, graphs, shortest paths

Gennady the Dentist

brute force, implementation

Dima and Lisa

brute force, math, number theory

Marina and Vasya

constructive algorithms, greedy, strings

Kolya and Tanya

combinatorics

Once Again...

constructive algorithms, dp, matrices

GCD Table

constructive algorithms, greedy, number theory

Three Logos

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

Developing Skills

implementation, math, sortings

Kefa and Dishes

bitmasks, dp

Kefa and Park

dfs and similar, graphs, trees

Kefa and Company

binary search, sortings, two pointers

Finding Team Member

brute force, implementation, sortings

"Or" Game

brute force, greedy

A Problem about Polyline

geometry, math

Modulo Sum

combinatorics, data structures, dp, two pointers

Vasya and Petya's Game

math, number theory

Bots

combinatorics, dp, math, number theory

Tablecity

constructive algorithms, implementation

Bear and Three Musketeers

brute force, dfs and similar, graphs, hashing

Bear and Blocks

binary search, data structures, dp, math

Bear and Poker

implementation, math, number theory

Order Book

data structures, greedy, implementation, sortings

Replacement

constructive algorithms, data structures, implementation

Simple Game

constructive algorithms, games, greedy, implementation, math

Music

implementation, math

Symmetric and Transitive

combinatorics, dp, math

Primes or Palindromes?

brute force, implementation, math, number theory

One-Dimensional Battle Ships

binary search, data structures, greedy, sortings

Geometric Progression

binary search, data structures, dp

Berland National Library

implementation

Clique in the Divisibility Graph

dp, math, number theory

Restructuring Company

data structures, dsu

Equivalent Strings

divide and conquer, hashing, sortings, strings

Gerald's Hexagon

brute force, geometry, math

Amr and Chemistry

brute force, graphs, greedy, math, shortest paths

Amr and The Large Array

implementation

Arthur and Table

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

Pasha and Tea

constructive algorithms, implementation, math, sortings

Case of Matryoshkas

implementation

Kyoya and Permutation

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