Tell Your World

brute force, geometry

Rooter's Song

constructive algorithms, data structures, geometry, implementation, sortings, two pointers

From Y to Y

constructive algorithms

Travel Cards

greedy, implementation, sortings

Noise Level

dfs and similar, implementation, math

Load Testing

greedy

Packmen

binary search, dp

Sum of Nestings

constructive algorithms

Preparing for Merge Sort

binary search, data structures

Union of Doubly Linked Lists

implementation

Random Query

data structures, math, probabilities, two pointers

Monitor

binary search, data structures

Four Segments

brute force, data structures, dp

Math Show

brute force, greedy

Curriculum Vitae

brute force, implementation

Driving Test

data structures, dp, greedy

Two TVs

data structures, greedy, sortings

Luba And The Ticket

brute force, greedy, implementation

Rectangles

combinatorics, math

Sorting by Subsequences

dfs and similar, dsu, implementation, math, sortings

Leha and Function

combinatorics, greedy, math, number theory, sortings

Journey

dfs and similar, dp, graphs, probabilities, trees

Game of the Rows

brute force, greedy, implementation

Binary Blocks

brute force

Two Seals

brute force, implementation

Flag of Berland

brute force, implementation

Palindromic characteristics

brute force, dp, hashing, strings

Star sky

dp, implementation

The Meaningless Game

math, number theory

Misha, Grisha and Underground

dfs and similar, graphs, trees

Petya and Exam

implementation, strings

Jury Marks

brute force, constructive algorithms

Cards Sorting

data structures, implementation, sortings

Office Keys

binary search, brute force, dp, greedy, sortings

Black Square

implementation

High Load

constructive algorithms, greedy, implementation, trees

String Reconstruction

data structures, greedy, sortings, strings

Suitable Replacement

binary search, greedy, implementation

Multi-judge Solving

greedy, implementation

Five-In-a-Row

brute force, implementation

My pretty girl Noora

brute force, dp, greedy, math, number theory

Hacker, pack your bags!

binary search, greedy, implementation, sortings

Okabe and Boxes

data structures, greedy, trees

Okabe and Banana Trees

brute force, math

Mister B and Angle in Polygon

constructive algorithms, geometry, math

Mister B and PR Shifts

data structures, implementation, math

Card Game Again

binary search, data structures, number theory, two pointers

Multicolored Cars

data structures, implementation

Permutation Game

implementation

Imbalanced Array

data structures, divide and conquer, dsu, sortings

Really Big Numbers

binary search, brute force, dp, math

Makes And The Product

combinatorics, implementation, math, sortings

Karen and Coffee

binary search, data structures, implementation

Karen and Game

brute force, greedy, implementation

An impassioned circulation of affection

brute force, dp, strings, two pointers

An express train to reveries

constructive algorithms

The Tag Game

dfs and similar, graphs

The Golden Age

brute force, math

Sagheer and Nubian Market

binary search, sortings

Sagheer, the Hausmeister

bitmasks, brute force, dp

Vladik and Memorable Trip

dp, implementation

Summer sell-off

greedy, sortings

Do you want a date?

implementation, math, sortings

Array Division

binary search, data structures, implementation

Tea Party

constructive algorithms, greedy, sortings

Average Sleep Time

data structures, implementation, math

T-Shirt Hunt

brute force, implementation

Minimum number of steps

combinatorics, greedy, implementation, math

Magazine Ad

binary search, greedy

Maximal GCD

constructive algorithms, greedy, math

Maximal Binary Matrix

constructive algorithms

Send the Fool Further! (easy)

dfs and similar, graphs, trees

Heidi and Library (medium)

data structures, greedy

Heidi and Library (easy)

greedy

Fountains

binary search, data structures, implementation

T-shirt buying

data structures, implementation

Mike and gcd problem

dp, greedy, number theory

Mike and strings

brute force, dp, strings

Minimal string

data structures, greedy, strings

Odd sum

dp, greedy, implementation

Bank Hacking

constructive algorithms, data structures, dp, trees

Find The Bone

implementation

Naming Company

games, greedy, sortings

Igor and his way to work

dfs and similar, graphs, implementation, shortest paths

Paths in a Complete Binary Tree

bitmasks, trees

Counting-out Rhyme

implementation

Masha and geometric depression

brute force, implementation, math

Functions again

dp, two pointers

Not Afraid

greedy, implementation, math

Anton and Fairy Tale

binary search, math

Crunching Numbers Just for You

*special problem, implementation

Touchy-Feely Palindromes

*special problem, implementation

INTERCALC

*special problem, implementation

Numbers Joke

*special problem

Innokenty and a Football League

2-sat, graphs, greedy, implementation, shortest paths, strings

Andryusha and Colored Balloons

dfs and similar, graphs, greedy, trees

The Meeting Place Cannot Be Changed

binary search

Bitwise Formula

bitmasks, brute force, dfs and similar, expression parsing, implementation

String Game

binary search, greedy, strings

Cloud of Hashtags

binary search, greedy, implementation, strings