Coloring a Tree

dfs and similar, dsu, greedy

Visiting a Friend

greedy, implementation

Cyclic Cipher

fft, math

Weighting a Tree

constructive algorithms, dfs and similar, graphs

Bipartite Segments

binary search, data structures, dfs and similar, dsu, graphs, two pointers

GCD of Polynomials

constructive algorithms, math

Hashing Trees

constructive algorithms, trees

Maximum Questions

data structures, dp, strings

Unusual Sequences

bitmasks, combinatorics, dp, math, number theory

Remove Extra One

brute force, data structures, math

Position in Fraction

math, number theory

Find Extra One

geometry, implementation

Letters Removing

data structures, strings

Segments Removal

data structures, dsu, flows, implementation, two pointers

Shovel Sale

constructive algorithms, math

Dividing the numbers

constructive algorithms, graphs, math

Months and Years

implementation

Splitting in Teams

constructive algorithms, greedy, math

Restoring the Expression

brute force, hashing, math

Squares and not squares

constructive algorithms, greedy

Alarm Clock

greedy

Phone Numbers

implementation, strings

Proper Nutrition

brute force, implementation, number theory

Rounding

implementation, math

Chtholly's request

brute force

Scarborough Fair

implementation

Welcome home, Chtholly

data structures, dsu

Nephren Runs a Cinema

chinese remainder theorem, combinatorics, math, number theory

Willem, Chtholly and Seniorious

data structures, probabilities

Ithea Plays With Chtholly

binary search, constructive algorithms, games, greedy, interactive

Nephren gives a riddle

binary search, dfs and similar

Eyes Closed

data structures, probabilities

String Mark

combinatorics, math, strings

Square Subsets

bitmasks, combinatorics, dp, math

XK Segments

binary search, math, sortings, two pointers

Pizza Separation

brute force, implementation

Ralph and Mushrooms

dp, graphs

Ralph And His Tour in Binary Country

brute force, data structures, trees

Marco and GCD Sequence

constructive algorithms, math

Ralph And His Magic Field

combinatorics, constructive algorithms, math, number theory

QAQ

brute force, dp

Subtree Minimum Query

data structures, trees

Counting Arrays

combinatorics, dp, math, number theory

Credit Card

data structures, dp, greedy, implementation

Rumor

dfs and similar, graphs, greedy

Beautiful Divisors

brute force, implementation

Chess For Three

implementation

Wrath

greedy, implementation, two pointers

Greed

greedy, implementation

Lust

combinatorics, math, matrices

Sloth

dfs and similar, dp, graph matchings, trees

Envy

data structures, dsu, graphs

Gluttony

constructive algorithms, greedy

Pride

brute force, dp, greedy, math, number theory

Mod Mod Mod

binary search, dp, math

Xor-MST

bitmasks, constructive algorithms, data structures

Connecting Vertices

dp, graphs

Maximum Subsequence

bitmasks, divide and conquer, meet-in-the-middle

Almost Identity Permutations

combinatorics, dp, math

K-Dominant Character

binary search, implementation, two pointers

Buggy Robot

greedy

Local Extrema

brute force, implementation

Row of Models

greedy, sortings

Little Brother

binary search, geometry, sortings

Ratings and Reality Shows

data structures, two pointers

Solution for Cube

brute force, implementation

Cubes for Masha

brute force, implementation

Div. 64

implementation

Symmetric Projections

geometry

Maximum Element

combinatorics, dp, math

Restoration of string

constructive algorithms, graphs, implementation

Petya and Catacombs

dsu, greedy, implementation, trees

Vlad and Cafes

ACM ICPC

brute force

Anti-Palindromize

flows, graphs, greedy

Binary Matrix

dsu

Boxes And Balls

data structures, greedy

Bertown Subway

dfs and similar, greedy, math

Japanese Crosswords Strike Back

implementation

Book Reading

implementation

Quadcopter Competition

greedy, math

Berland.Taxi

data structures

Road Widening

constructive algorithms, greedy, implementation

Renovation

constructive algorithms, greedy, sortings

Photo Processing

binary search, dp

Palindromic Cut

brute force, implementation, strings

Orientation of Edges

dfs and similar, graphs

Lost in Transliteration

implementation

Field of Wonders

implementation, strings

Packmen Strike Back

binary search, dp, math

Downloading B++

binary search, implementation

Berland Army

constructive algorithms, graphs, greedy

Automatic Door

implementation

Table Tennis

data structures, implementation

Borya's Diagnosis

implementation

Numbers on the blackboard

combinatorics, dp

Magic Breeding

bitmasks

Tournament

data structures, graphs

Teams Formation

data structures, implementation

Short Program

bitmasks, constructive algorithms