Non-Secret Cypher

two pointers

Staircases

brute force, combinatorics, data structures, dfs and similar, dp, implementation, math

Tourist Reform

dfs and similar, graphs

Rearrange Brackets

brute force, dp, greedy, sortings, strings

Symmetric and Transitive

combinatorics, dp, math

Om Nom and Candies

brute force, greedy, math

Young Table

implementation, sortings

Martian Clock

implementation

Copy of a Copy of a Copy

constructive algorithms, dfs and similar, graphs, implementation, sortings

Points and Segments (easy)

constructive algorithms, sortings

Not Escaping

data structures, dp, implementation, shortest paths, two pointers

Hamsters and Tigers

two pointers

Restoring Table

constructive algorithms, greedy

Mocha and Stars

combinatorics, dp, fft, math, number theory

Changing Array

greedy, implementation

Count Seconds

brute force, constructive algorithms, dp, graphs, implementation, math

In Search of Truth (Easy Version)

constructive algorithms, interactive, math, meet-in-the-middle, probabilities

Tokitsukaze and Strange Rectangle

data structures, divide and conquer, sortings, two pointers

k-Interesting Pairs Of Integers

*special problem, bitmasks, brute force, meet-in-the-middle

Domino Principle

binary search, data structures, sortings

Multi-Colored Segments

binary search, data structures, math, sortings

Envy

data structures, dsu, graphs

Weights Division (hard version)

binary search, dfs and similar, greedy, sortings, trees, two pointers

Block Tower

constructive algorithms, dfs and similar, graphs

Old Peykan

greedy

Random Query

data structures, math, probabilities, two pointers

Nezzar and Nice Beatmap

constructive algorithms, geometry, greedy, math, sortings

Divide Points

constructive algorithms, geometry, math

Product Sum

data structures, dp, geometry

Jzzhu and Apples

constructive algorithms, number theory

Rock-Paper-Scissors

implementation, math

New Year Contest

greedy, sortings

Yaroslav and Divisors

data structures

File List

dp, greedy, implementation

Another MEX Problem

bitmasks, brute force, dp, shortest paths

Cartons of milk

binary search, data structures, greedy, sortings, two pointers

Privatization of Roads in Treeland

binary search, constructive algorithms, dfs and similar, graphs, greedy, trees

Rain and Umbrellas

dp

AND Graph

bitmasks, dfs and similar, dsu, graphs

Suspects

constructive algorithms, data structures, implementation

Case of Computer Network

dfs and similar, graphs, trees

Resource Distribution

binary search, implementation, sortings

Skills

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

Divan and Kostomuksha (hard version)

dp, number theory

Two Heaps

combinatorics, constructive algorithms, greedy, implementation, math, sortings

Two Types of Spells

binary search, data structures, greedy, implementation, math, sortings

Make It One

bitmasks, combinatorics, dp, math, number theory, shortest paths

Correcting Mistakes

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

The Harmonization of XOR

bitmasks, constructive algorithms, greedy, math

Mashmokh and Reverse Operation

combinatorics, divide and conquer

Ball Sorting

data structures, dp, sortings

Cars

2-sat, constructive algorithms, dfs and similar, dsu, graphs, greedy, sortings

Pawn

dp

Test

hashing, strings

Fruit Sequences

binary search, data structures, divide and conquer, dp, two pointers

Well played!

greedy, sortings

Moment of Bloom

constructive algorithms, dfs and similar, graph matchings, graphs, greedy, trees

George and Number

greedy, implementation

Sign on Fence

binary search, constructive algorithms, data structures

Industrial Nim

games

Hemose in ICPC ?

binary search, dfs and similar, implementation, interactive, math, number theory, trees

Divide Square

data structures, geometry, implementation, sortings

Treasure Hunting

binary search, dp, greedy, implementation

Wrong Answer

constructive algorithms

Lucky Number 2

constructive algorithms

Vasya and Binary String

dp

Board Game

games, greedy, implementation, math

Anya and the Mysterious String

binary search, data structures

Fox And Dinner

flows

Ralph and Mushrooms

dp, graphs

Square and Rectangles

implementation

Turtle Mission: Robot and the Earthquake

dfs and similar, dp, graphs, shortest paths

Subordinates

constructive algorithms, data structures, graphs, greedy, sortings

Interactive LowerBound

brute force, interactive, probabilities

Fedor and coupons

binary search, data structures, greedy, sortings

Vitaly and Cycle

combinatorics, dfs and similar, graphs, math

Area of Two Circles' Intersection

geometry

Petya, Petya, Petr, and Palindromes

binary search, brute force, data structures, two pointers

Jury Size

brute force, implementation

Help General

constructive algorithms, greedy, implementation

Olympiad

binary search, greedy, sortings, two pointers

An overnight dance in discotheque

dfs and similar, dp, geometry, greedy, trees

Haar Features

greedy, implementation

Infinite Maze

dfs and similar, graphs

A rectangle

math

Autosynthesis

constructive algorithms, dfs and similar, graphs, greedy, sortings

Polygons

geometry, sortings

Tourists

data structures, dfs and similar, graphs, trees

Array and Segments (Hard version)

data structures, implementation

Bear and Tower of Cubes

binary search, dp, greedy

Tree of Life (easy)

Complicated Computations

binary search, data structures, two pointers

New Year Tree

data structures, divide and conquer, trees

The Queue

brute force, greedy

Yaroslav and Time

binary search, graphs, shortest paths

Random Task

binary search, bitmasks, combinatorics, dp, math

Car Repair Shop

implementation

Ray Tracing

greedy, hashing, implementation, math, number theory, sortings

Construct the Binary Tree

brute force, constructive algorithms, trees

Special Task

math