Random Teams

combinatorics, constructive algorithms, greedy, math

Dreamoon and WiFi

bitmasks, brute force, combinatorics, dp, math, probabilities

Design Tutorial: Learn from Life

MUH and Important Things

implementation, sortings

Chat Online

implementation

Appleman and Card Game

greedy

Pashmak and Flowers

combinatorics, implementation, sortings

Sort the Array

implementation, sortings

Jzzhu and Sequences

implementation, math

The Child and Homework

implementation

Xor-tree

dfs and similar, trees

Sereja and Mirroring

implementation

Art Union

brute force, dp, implementation

Spyke Chatting

implementation

Semifinals

implementation, sortings

I.O.U.

implementation

Fox Dividing Cheese

math, number theory

Berland Bingo

implementation

Jeff and Periods

implementation, sortings

Difference Row

constructive algorithms, implementation, sortings

Down the Hatch!

implementation

Road Construction

constructive algorithms, graphs

Strings of Power

implementation, strings, two pointers

Archer

math, probabilities

The Closest Pair

constructive algorithms, implementation

Calendar

brute force, implementation

Lucky Permutation Triple

constructive algorithms, implementation, math

Snow Footprints

greedy, implementation

Command Line Arguments

*special problem, implementation, strings

Polo the Penguin and Strings

greedy

Little Girl and Game

games, greedy

Prime Matrix

binary search, brute force, math, number theory

Playing Cubes

games, greedy, implementation

Points on Line

binary search, combinatorics, two pointers

Increase and Decrease

greedy, math

Old Peykan

greedy

Not Wool Sequences

constructive algorithms, math

Easy Number Challenge

implementation, number theory

Weather

dp, implementation

T-primes

binary search, implementation, math, number theory

Where do I Turn?

geometry

Cosmic Tables

data structures, implementation

Little Elephant and Numbers

implementation

Little Elephant and Problem

implementation, sortings

Olympic Medal

greedy, math

Game on Paper

brute force, implementation

After Training

data structures, implementation, math

Funky Numbers

binary search, brute force, implementation

Counting Rhombi

brute force, math

Cut Ribbon

brute force, dp

A + Reverse B

*special problem, implementation

Plant

math

Number of Triplets

binary search, brute force

Rock-Paper-Scissors

implementation, math

Broken checker

*special problem, brute force

Star

*special problem, combinatorics

Dress'em in Vests!

binary search, brute force, greedy, two pointers

Ice Sculptures

*special problem, brute force, number theory

Steps

binary search, implementation

Punctuation

implementation, strings

Lucky Mask

brute force, implementation

Meeting

implementation

Replacement

greedy, implementation, sortings

Turing Tape

implementation

Prime Permutation

implementation, number theory, strings

Elevator

implementation, math

Help Chef Gerasim

implementation, sortings

Lucky Numbers (easy)

binary search, bitmasks, brute force

Friends

graphs, implementation, math

Binary Number

greedy

Domino

constructive algorithms, implementation

Magical Array

math

Progress Bar

implementation, math

Cookies

math

Petya and Java

implementation, strings

Factorial

*special problem, implementation

A Student's Dream

greedy, math

Hard Work

strings

Where Are My Flakes?

implementation, two pointers

Coins

greedy

Square Earth?

dfs and similar, greedy, implementation

Spoilt Permutation

implementation

Presents

implementation

Cheaterius's Problem

implementation

Holidays

implementation

Lucky Tickets

greedy

Email address

expression parsing, implementation

Find Color

constructive algorithms, geometry, implementation, math

Multiplication Table

implementation

Pacifist frogs

implementation

Company Income Growth

greedy

Extra-terrestrial Intelligence

implementation

Page Numbers

expression parsing, implementation, sortings, strings

Tournament

bitmasks, brute force, dfs and similar, greedy

IQ test

brute force

Registration System

data structures, hashing, implementation