"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

Kyoya and Colored Balls

combinatorics, dp, math

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

ZgukistringZ

brute force, constructive algorithms, implementation, strings

Regular Bridge

constructive algorithms, graphs, implementation

Divisibility by Eight

brute force, dp, math

Preparing Olympiad

bitmasks, brute force

Two Substrings

brute force, dp, greedy, implementation, strings

Haar Features

greedy, implementation

Mike and Fun

brute force, dp, greedy, implementation

Mike and Feet

binary search, data structures, dp, dsu

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

Writing Code

dp

Bad Luck Island

dp, probabilities

School Marks

greedy, implementation

Weird Chess

brute force, constructive algorithms, implementation

Tourist's Notes

binary search, brute force, greedy, implementation, math

Quasi Binary

constructive algorithms, dp, greedy, implementation

Cutting Banner

brute force, implementation

Tavas and Malekas

greedy, hashing, string suffix structures, strings

Tavas and Karafs

binary search, greedy, math

Handshakes

binary search, constructive algorithms, data structures, greedy

Polycarpus' Dice

math

Covered Path

dp, greedy, math

Correcting Mistakes

constructive algorithms, dp, greedy, hashing, strings, two pointers

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

Group Photo 2 (online mirror version)

brute force, greedy, sortings

Clique Problem

data structures, dp, greedy, implementation, sortings

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

The Art of Dealing with ATM

binary search, sortings

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 Interesting Substrings

data structures, dp, two pointers

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

Inversions problem

brute force, dfs and similar, dp, meet-in-the-middle

Permutations

bitmasks, divide and conquer, math

Permutations

brute force

Fox And Jumping

bitmasks, brute force, dp, math

Fox And Names

dfs and similar, graphs, sortings

Fox And Two Dots

dfs and similar

Painting Pebbles

constructive algorithms, greedy, implementation

Anya and Ghosts

constructive algorithms, greedy

Anton and currency you all know

greedy, math, strings

Guess Your Way Out!

implementation, math, trees

Amr and Pins

geometry, math

Mr. Kitayuta, the Treasure Hunter

dfs and similar, dp, two pointers