Sereja and the Arrangement of Numbers

graphs, greedy, sortings

Jamie and Binary Sequence (changed after round)

bitmasks, greedy, math

Restore Cube

brute force, geometry

Mahmoud and Ehab and the binary string

binary search, divide and conquer, interactive

Minimal Diameter Forest

constructive algorithms, dfs and similar, greedy, trees

International Olympiad

constructive algorithms, greedy, implementation, math

Build String

flows, graphs

Vanya and Field

math

Bubble Strike

combinatorics, math, probabilities, ternary search

Wires

dfs and similar, graphs, greedy

Ants

brute force, implementation

Circular Mirror

binary search, combinatorics, geometry, math, two pointers

Olya and magical square

constructive algorithms, implementation, math

Second price auction

bitmasks, probabilities

Restoring Increasing Sequence

binary search, brute force, greedy, implementation

New Year Letter

bitmasks, brute force, dp

Sereja and Periods

binary search, dfs and similar, strings

Rectangle Puzzle

geometry

MYSTERIOUS LANGUAGE

*special problem

Police Patrol

greedy, implementation, math, ternary search

Digital Root

number theory

Number Busters

binary search, math

Neural Network country

dp, matrices

Interesting Game

dp, games, math

Intersection

implementation, math

Weak Memory

dfs and similar, dsu

Fragile Bridges

dp

Tree-String Problem

*special problem, dfs and similar, hashing, strings

Dima and Trap Graph

binary search, data structures, dfs and similar, dsu, shortest paths, two pointers

Berland University

greedy, math

First Digit Law

dp, math, probabilities

Sofa Thief

brute force, implementation

Subway Innovation

greedy, math, two pointers

Something with XOR Queries

brute force, interactive, probabilities

Last Chance

data structures, implementation, strings

Hydra

graphs, sortings

Dynamic Problem Scoring

brute force, greedy

Encryption (medium)

dp

Knights

geometry, graphs, shortest paths, sortings

Idempotent functions

constructive algorithms, graphs, math

Numbers

constructive algorithms, implementation

Little Elephant and Furik and Rubik

math, probabilities

Circle of Numbers

brute force, dfs and similar, implementation

A Piece of Cake

*special problem, implementation

Right Expansion Of The Mind

math

Journey

brute force, constructive algorithms, implementation

Lemmings

binary search

Nanami's Digital Board

dsu, implementation

Seller Bob

brute force, dp, greedy

Minimal Product

Flag 2

dp

Number Transformation

dp, greedy, number theory

Chocolate

dfs and similar, implementation

Xor

brute force

Beautiful IP Addresses

brute force

Death Stars (medium)

hashing, strings

Tanya and Colored Candies

*special problem, dp

Log Stream Analysis

binary search, brute force, implementation, strings

Education Reform

dp

What Has Dirichlet Got to Do with That?

dp, games

Inna and Sequence

binary search, data structures, dp, trees

Closing ceremony

greedy

Letter A

geometry, implementation

Kids' Riddle

*special problem

Parquet

combinatorics, constructive algorithms, greedy, implementation

Table with Letters - 2

brute force, two pointers

General Mobilization

data structures, dfs and similar, sortings

Robo-Footballer

binary search, geometry

Maxim and Matrix

constructive algorithms, dp, math

2048

bitmasks, dp

Special Grid

brute force, dp, greedy

Diverse Substrings

dp, strings, two pointers

Crossword

implementation

BF Calculator

*special problem

Happy Farm 5

geometry

Arrow

geometry

Out of Controls

*special problem

Sweets Game

bitmasks, dfs and similar, dp, games, implementation

Calendar

greedy, strings

E-reader Display

constructive algorithms, greedy

Optimal Sum

data structures, greedy

Capture Valerian

math

Building Forest

data structures, dsu, graphs

Vectors

implementation, math

Petya and Post

data structures, dp

Without Text

*special problem

C*++ Calculations

expression parsing, greedy

Cheese Board

Lucky Sorting

constructive algorithms, sortings

Dominoes

dfs and similar, graphs

Harvester

implementation

Team Arrangement

constructive algorithms, greedy, implementation

Present to Mom

binary search, two pointers

Collisions

brute force, implementation, math

Game

implementation

Merging Two Decks

constructive algorithms, greedy

Triminoes

constructive algorithms, greedy

T-decomposition

dfs and similar, graphs, greedy, trees

Martian Luck

math, number theory

Director

constructive algorithms, greedy