Compress String

dp, strings

Twisted Circuit

*special problem, brute force, implementation

Ghosts

geometry, math

Inverse Coloring

combinatorics, dp, math

The Fair Nut and Strings

greedy, strings

Characteristics of Rectangles

binary search, bitmasks, brute force, implementation, sortings

Theseus and labyrinth

graphs, implementation, shortest paths

Congruence Equation

chinese remainder theorem, math, number theory

Santa Claus and a Palindrome

constructive algorithms, data structures, greedy

Mike and Geometry Problem

combinatorics, data structures, dp, geometry, implementation

Dispute

dfs and similar, graphs, greedy

Two Pizzas

bitmasks, brute force

Water Taps

binary search, greedy, sortings

Beaver Game

dp, games, number theory

Giving Awards

dfs and similar

Digits

dp, math, number theory

Degenerate Matrix

binary search, math

Geo Game

greedy, interactive, math

Addition Robot

data structures, math, matrices

Transitive Graph

dfs and similar, dp, dsu, graphs, implementation

Pretty Song

math, strings

Topforces Strikes Back

brute force, math, sortings

Microtransactions (easy version)

binary search, greedy

Sereja and Subsequences

data structures, dp

Yet another 2D Walking

dp

Little Elephant and LCM

binary search, combinatorics, dp, math

Polycarp and Hay

dfs and similar, dsu, graphs, greedy, sortings

Broken BST

data structures, dfs and similar

Key Storage

combinatorics, math

Destroy it!

dp, implementation, sortings

GukiZ and Binary Operations

combinatorics, implementation, math, matrices, number theory

Restoration of string

constructive algorithms, graphs, implementation

Gifts by the List

constructive algorithms, dfs and similar, graphs, trees

Is It Flower?

dfs and similar, graphs, implementation

Big Maximum Sum

data structures, dp, greedy, implementation, math, trees

Order book

combinatorics, data structures, greedy

Sereja and the Arrangement of Numbers

graphs, greedy, sortings

Permutation recovery

constructive algorithms, data structures, dfs and similar, graphs, greedy, math, sortings

Chip 'n Dale Rescue Rangers

binary search, geometry, math

Full Binary Tree Queries

brute force, implementation, trees

Colorful Points

data structures, greedy, implementation

Jamie and Binary Sequence (changed after round)

bitmasks, greedy, math

Restore Cube

brute force, geometry

Light Bulbs (Easy Version)

brute force, combinatorics, dfs and similar, dp, dsu, graphs, math, trees

Greg and Friends

combinatorics, dp, graphs, shortest paths

Substitutes in Number

dp

Mahmoud and Ehab and the binary string

binary search, divide and conquer, interactive

Desk Disorder

combinatorics, dfs and similar, dsu, graphs, trees

Distributing Parts

greedy, sortings

International Olympiad

constructive algorithms, greedy, implementation, math

Minimal Diameter Forest

constructive algorithms, dfs and similar, greedy, trees

DNA Evolution

data structures, strings

Berland and the Shortest Paths

brute force, dfs and similar, graphs, shortest paths

Special Matrices

combinatorics, dp

Flawed Flow

constructive algorithms, flows, graphs, greedy

Vanya and Field

math

Nastya and a Game

brute force, implementation, math

Build String

flows, graphs

Beard Graph

data structures, dsu, trees

Chris and Road

geometry, implementation

Sockets

greedy, sortings

Presents in Bankopolis

dp, graphs, shortest paths

Invariance of Tree

constructive algorithms, dfs and similar, greedy, trees

Letters Removing

data structures, strings

Bubble Strike

combinatorics, math, probabilities, ternary search

Wires

dfs and similar, graphs, greedy

Ants

brute force, implementation

Little Girl and Problem on Trees

data structures, graphs, trees

Cactus

data structures, dfs and similar, dp, graphs, trees

Circular Mirror

binary search, combinatorics, geometry, math, two pointers

Cubes

games, greedy, implementation

Vladik and Favorite Game

constructive algorithms, dfs and similar, graphs, interactive

Olya and magical square

constructive algorithms, implementation, math

Happy Sets

combinatorics

Follow Traffic Rules

implementation, math

Second price auction

bitmasks, probabilities

Restoring Increasing Sequence

binary search, brute force, greedy, implementation

Changing a String

dp

Vasya's Function

binary search, implementation, math

Tesla

constructive algorithms, implementation

Grouped Carriages

binary search, data structures, dp, flows, greedy

New Year Letter

bitmasks, brute force, dp

Careful Maneuvering

bitmasks, brute force, geometry

Devu and Birthday Celebration

combinatorics, dp, math

The Unbearable Lightness of Weights

dp, math

Nice table

brute force, constructive algorithms, greedy, math

Sereja and Periods

binary search, dfs and similar, strings

Rectangle Puzzle

geometry

Santa Claus and Tangerines

binary search, data structures, greedy, two pointers

Counter Attack

data structures, dsu, graphs, hashing, sortings

Ilya and Roads

dp

Okabe and El Psy Kongroo

dp, matrices

Vanya and Brackets

brute force, dp, expression parsing, greedy, implementation, strings

MYSTERIOUS LANGUAGE

*special problem

Magic Trick

combinatorics, math, probabilities

Police Patrol

greedy, implementation, math, ternary search

Digital Root

number theory

Mahmoud and Ehab and the function

binary search, data structures, sortings

Boredom

data structures

Caisa and Tree

brute force, dfs and similar, math, number theory, trees