Correct Bracket Sequence Editor

data structures, dsu, strings

Scrambled

*special problem, implementation

Processing Queries

*special problem, constructive algorithms, data structures, two pointers

The Smallest String Concatenation

sortings, strings

Report

data structures, sortings

Pyramids

geometry, math

Parking Lot

combinatorics, math

Factory Repairs

data structures

XOR Equation

dp, math

Guest From the Past

implementation, math

Not Equal on a Segment

data structures, implementation

Wet Shark and Flowers

combinatorics, math, number theory, probabilities

Polyline

constructive algorithms, implementation

Lazy Student

constructive algorithms, data structures, graphs

Igor In the Museum

dfs and similar, graphs, shortest paths

Wilbur and Points

combinatorics, greedy, sortings

Median Smoothing

implementation

Phillip and Trains

dfs and similar, graphs, shortest paths

Marina and Vasya

constructive algorithms, greedy, strings

GCD Table

constructive algorithms, greedy, number theory

Three Logos

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

"Or" Game

brute force, greedy

A Problem about Polyline

geometry, math

Tablecity

constructive algorithms, implementation

One-Dimensional Battle Ships

binary search, data structures, greedy, sortings

Geometric Progression

binary search, data structures, dp

Equivalent Strings

divide and conquer, hashing, sortings, strings

Soldier and Number Game

constructive algorithms, dp, math, number theory

School Marks

greedy, implementation

Board Game

games, greedy, implementation, math

Sum and product

*special problem

Фото на память - 2 (round version)

dp, greedy

Ilya and Escalator

combinatorics, dp, math, probabilities

Guess Your Way Out!

implementation, math, trees

Crazy Town

geometry

Vasya and Chess

constructive algorithms, games, math

Hacking Cypher

brute force, math, number theory, strings

Unbearable Controversy of Being

brute force, combinatorics, dfs and similar, graphs

Palindrome Transformation

brute force, greedy, implementation

Bits

bitmasks, constructive algorithms

Long Jumps

binary search, greedy, implementation

Flowers

dp

MUH and House of Cards

binary search, brute force, greedy, math

George and Job

dp, implementation

Number of Ways

binary search, brute force, data structures, dp, two pointers

No to Palindromes!

greedy, strings

Present

binary search, data structures, greedy

Golden System

math, meet-in-the-middle

Predict Outcome of the Game

brute force, implementation, math

Jzzhu and Chocolate

greedy, math

Borya and Hanabi

bitmasks, brute force, implementation

Devu and his Brother

binary search, sortings, ternary search, two pointers

Devu and Partitioning of the Array

brute force, constructive algorithms, implementation, number theory

Checkposts

dfs and similar, graphs, two pointers

Kicker

implementation

Big Data

*special problem

Magnum Opus

*special problem

Mysterious Language

*special problem

The Great Game

*special problem

Toy Sum

greedy, implementation, math

George and Number

greedy, implementation

Bear and Prime Numbers

binary search, brute force, data structures, dp, implementation, math, number theory

Arithmetic Progression

implementation, sortings

Levko and Array Recovery

greedy, implementation

Color the Fence

data structures, dp, greedy, implementation

Xenia and Bit Operations

data structures, trees

Xenia and Weights

constructive algorithms, dfs and similar, dp, graphs, greedy, shortest paths

Shave Beaver!

implementation

Magic Five

combinatorics, math

Ciel and Robot

binary search, implementation, math

Good Substrings

hashing, strings

Continued Fractions

brute force, implementation, math

Rectangle Puzzle II

implementation, math

Parity Game

constructive algorithms

Greg and Graph

dp, graphs, shortest paths

Shaass and Bookshelf

dp, greedy

WTF?

*special problem, graph matchings, implementation, trees

Polo the Penguin and XOR operation

implementation, math

Pipeline

binary search, math

Cow Program

dfs and similar, dp, graphs

Nearest Fraction

brute force, implementation, two pointers

Ladder

dp, implementation, two pointers

Little Girl and Maximum XOR

bitmasks, dp, greedy, implementation, math

Convex Shape

constructive algorithms, implementation

Greenhouse Effect

dp

Balls and Boxes

constructive algorithms, greedy, implementation

Game with Coins

greedy

Planets

binary search, data structures, graphs, shortest paths

Barcode

dp, matrices

Bracket Sequence

data structures, expression parsing, implementation

Choosing Capital for Treeland

dfs and similar, dp, graphs, trees

Spider's Web

binary search, sortings, two pointers

Forming Teams

dfs and similar, implementation

Game

dfs and similar, greedy

Military Trainings

Hit Ball

geometry, implementation, math

Brand New Easy Problem

brute force

Clear Symmetry

constructive algorithms, dp, math

About Bacteria

implementation, math

Cutting Figure

constructive algorithms, graphs, trees