Fountains

binary search, data structures, implementation

Debate

greedy

Brain Network (medium)

dfs and similar, graphs, trees

Tree Construction

data structures, trees

Strange Housing

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

Alena And The Heater

binary search, implementation

01 Tree

constructive algorithms, data structures, dsu, greedy, sortings, trees

Social Circles

greedy, math

Unlucky Numbers

brute force, dp, greedy, implementation

Da Vinci Powers

*special problem

N Problems During K Days

constructive algorithms, greedy, math

Coloring Brackets

dp

Cottage Village

implementation, sortings

Magic, Wizardry and Wonders

constructive algorithms, greedy

Height All the Same

combinatorics, constructive algorithms, math, matrices

Ciel and Robot

binary search, implementation, math

Punctuation

implementation, strings

Maximum Diameter Graph

constructive algorithms, graphs, implementation

Eight Point Sets

sortings

Portal

brute force, data structures, dp, greedy, implementation

Sum of Paths

combinatorics, dp, math

Petya and Divisors

binary search, data structures, number theory

MUH and House of Cards

binary search, brute force, greedy, math

Edge Split

brute force, constructive algorithms, dfs and similar, dsu, graphs, probabilities, trees

T-Shirt Hunt

brute force, implementation

T-shirts from Sponsor

implementation

0-1-Tree

dfs and similar, divide and conquer, dp, dsu, trees

Down the Hatch!

implementation

Weight the Tree

constructive algorithms, dfs and similar, dp, implementation, trees

Where Are My Flakes?

implementation, two pointers

DZY Loves Modification

brute force, data structures, greedy

Clique in the Divisibility Graph

dp, math, number theory

Guess the Permutation

binary search, combinatorics, interactive, math

Prime Permutation

implementation, number theory, strings

Errich-Tac-Toe (Hard Version)

constructive algorithms, math

Tree Reconstruction

constructive algorithms, data structures, graphs, greedy

Spiders

dp, greedy, trees

Problems for Round

greedy, implementation

PFAST Inc.

bitmasks, brute force, graphs

Non-Decreasing Dilemma

data structures, divide and conquer, math

Connected Component on a Chessboard

constructive algorithms, implementation

One Occurrence

data structures, divide and conquer

Palindrome Degree

hashing, strings

Quadcopter Competition

greedy, math

Carrots for Rabbits

binary search, data structures, greedy, math, sortings

Phillip and Trains

dfs and similar, graphs, shortest paths

Salyg1n and Array (simple version)

constructive algorithms, interactive, math

MADMAX

dfs and similar, dp, games, graphs

Shopping

brute force

Railway System

constructive algorithms, graphs, greedy, interactive, sortings

Multitasking

greedy, implementation, sortings, two pointers

Tell Your World

brute force, geometry

Magical Boxes

greedy, math

Increasing Matrix

greedy

To Go Or Not To Go?

brute force, dfs and similar, graphs, greedy, implementation, shortest paths

Optimal Partition

data structures, dp

Stars Drawing (Hard Edition)

binary search, dp, greedy

Game on Tree

implementation, math, probabilities, trees

Newspaper Headline

greedy, strings

Easy As ABC

brute force

Inna and Alarm Clock

implementation

Cracking the Code

implementation, math

Fish Weight

constructive algorithms, greedy

The Sum of the k-th Powers

math

Shifts

brute force, two pointers

High Load

constructive algorithms, greedy, implementation, trees

Soldier and Traveling

flows, graphs, math

Cyclic MEX

data structures, implementation, math, two pointers

Tufurama

data structures

GukiZ hates Boxes

binary search, greedy

Two Tables

brute force, implementation

Power Transmission (Hard Edition)

data structures, geometry, implementation, math

The Monster

dp, greedy, implementation, math

New Problem

brute force, strings

XK Segments

binary search, math, sortings, two pointers

Money Transfers

constructive algorithms, data structures, greedy, sortings

Reberland Linguistics

dp, implementation, strings

Three Logos

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

Decreasing Debts

constructive algorithms, data structures, graphs, greedy, implementation, math, two pointers

Square

math

Ilya And The Tree

dfs and similar, graphs, math, number theory, trees

The Butcher

geometry, greedy, implementation, sortings, two pointers

Kirill and Mushrooms

data structures, sortings

Bus Number

brute force, combinatorics, math

Cashback

data structures, dp, greedy, math

Yet Another Minimization Problem

divide and conquer, dp

Feed with Candy

greedy

Team Building

bitmasks, dp, greedy, sortings

Tokitsukaze and Two Colorful Tapes

constructive algorithms, dfs and similar, graphs, greedy

Johnny and Grandmaster

greedy, implementation, math, sortings

Multicolored Cars

data structures, implementation

Lazy Student

constructive algorithms, data structures, graphs

Find Pair

implementation, math, sortings

Sum of Progression

brute force, data structures, dp, implementation, math

Xor Tree

binary search, bitmasks, data structures, divide and conquer, dp, trees

Tree Diameter

bitmasks, graphs, interactive

Chess

brute force, implementation, math

Puzzles

dfs and similar, math, probabilities, trees

Glass Half Spilled

dp

DZY Loves Physics

greedy, math