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

Alternative Thinking

dp, greedy, math

Approximating a Constant Range

dp, implementation, two pointers

The Two Routes

graphs, shortest paths

Queries about less or equal elements

binary search, data structures, sortings, two pointers

Extract Numbers

implementation, strings

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

Restaurant

dp, greedy, sortings

Divisibility

math

Wilbur and Points

combinatorics, greedy, sortings

Pasha and Phone

binary search, math

Anton and Lines

geometry, sortings

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

Marina and Vasya

constructive algorithms, greedy, strings

Kolya and Tanya

combinatorics

GCD Table

constructive algorithms, greedy, number theory

Three Logos

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

Developing Skills

implementation, math, sortings

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

Vasya and Petya's Game

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

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

Equivalent Strings

divide and conquer, hashing, sortings, strings

Gerald's Hexagon

brute force, geometry, math

Amr and The Large Array

implementation

Pasha and Tea

constructive algorithms, implementation, math, sortings

Case of Matryoshkas

implementation

Kyoya and Colored Balls

combinatorics, dp, math

Divisibility by Eight

brute force, dp, math

Preparing Olympiad

bitmasks, brute force

Two Substrings

brute force, dp, greedy, implementation, strings

Mike and Fun

brute force, dp, greedy, implementation

Soldier and Number Game

constructive algorithms, dp, math, number theory

Soldier and Cards

brute force, dfs and similar, games

Queue

greedy, implementation, sortings

Woodcutters

dp, greedy

Sea and Islands

constructive algorithms, implementation

School Marks

greedy, implementation

Tourist's Notes

binary search, brute force, greedy, implementation, math

Quasi Binary

constructive algorithms, dp, greedy, implementation

Cutting Banner

brute force, implementation

Polycarpus' Dice

math

Covered Path

dp, greedy, math

Board Game

games, greedy, implementation, math

Sum and product

*special problem

Set subtraction

*special problem

Diophantine equation

*special problem

String inside out

*special problem

Quadratic equation

*special problem

Glass Carving

binary search, data structures, implementation

Error Correct System

greedy

Om Nom and Dark Park

dfs and similar, greedy, implementation

King of Thieves

brute force, implementation

Ilya and Sticks

greedy, math, sortings

Pasha and String

constructive algorithms, greedy, math, strings

Фото на память - 2 (round version)

dp, greedy

Возможно, вы знаете этих людей?

implementation

Statistics of Recompressing Videos

*special problem, data structures, implementation

Name Quest

*special problem, greedy

Mean Requests

*special problem, implementation

DNA Alignment

math, strings

Two Buttons

dfs and similar, graphs, greedy, implementation, math, shortest paths

A and B and Team Training

greedy, implementation, math, number theory

Ilya and Escalator

combinatorics, dp, math, probabilities

Anya and Smartphone

constructive algorithms, data structures, implementation

Tanya and Postcard

greedy, implementation, strings

Vitaly and Strings

constructive algorithms, strings

Drazil and Factorial

greedy, math, sortings

Drazil and His Happy Friends

brute force, dsu, meet-in-the-middle, number theory

Han Solo and Lazer Gun

brute force, data structures, geometry, implementation, math

Permutations

brute force

Fox And Names

dfs and similar, graphs, sortings

Fox And Two Dots

dfs and similar

Painting Pebbles

constructive algorithms, greedy, implementation