DZY Loves Fibonacci Numbers

data structures, math, number theory

DZY Loves Modification

brute force, data structures, greedy

DZY Loves Sequences

dp, implementation, two pointers

DZY Loves Chemistry

dfs and similar, dsu, greedy

DZY Loves Planting

binary search, dsu, trees

DZY Loves Strings

binary search, hashing, strings, two pointers

DZY Loves Colors

data structures

DZY Loves FFT

probabilities

DZY Loves Physics

greedy, math

Kolya and Tandem Repeat

brute force, implementation, strings

Gena and Second Distance

geometry

Adam and Tree

data structures, trees

Artem and Array

data structures, greedy

Andrey and Problem

greedy, math, probabilities

Borya and Hanabi

bitmasks, brute force, implementation

Valera and Number

bitmasks, dp, math, probabilities

Valera and Swaps

constructive algorithms, dsu, graphs, implementation, math, string suffix structures

Valera and Tubes

constructive algorithms, dfs and similar, implementation

Valera and Fruits

greedy, implementation

Berland Federalization

dp, trees

One-Based Arithmetic

brute force, dfs and similar, divide and conquer

Balancer

greedy, implementation

Devu and Birthday Celebration

combinatorics, dp, math

Devu and his Brother

binary search, sortings, ternary search, two pointers

Devu and Partitioning of the Array

brute force, constructive algorithms, implementation, number theory

The Child and Binary Tree

combinatorics, divide and conquer, fft, number theory

The Child and Sequence

data structures, math

The Child and Polygon

dp, geometry

The Child and Zoo

dsu, sortings

The Child and Toy

graphs, greedy, sortings

The Child and Set

bitmasks, greedy, implementation, sortings

Banners

brute force, data structures, dp

Cardboard Box

data structures, greedy

Pudding Monsters

dp

Dungeons and Candies

dsu, graphs, greedy, trees

Om Nom and Spiders

implementation, math

Feed with Candy

greedy

Special Graph

Special Grid

brute force, dp, greedy

Cardiogram

implementation

Pasha Maximizes

greedy

Furukawa Nagisa's Tree

binary search, divide and conquer, sortings, trees

Nanami's Power Plant

flows

Tachibana Kanade's Tofu

dp

Nanami's Digital Board

dsu, implementation

Ryouko's Memory Note

implementation, math, sortings

Square Tiling

constructive algorithms, greedy

Prefixes and Suffixes

dp, string suffix structures, strings, two pointers

Prime Swaps

greedy, sortings

Chemistry Experiment

binary search, data structures, ternary search

Random Task

binary search, bitmasks, combinatorics, dp, math

k-Tree

dp, implementation, trees

Balls Game

brute force, two pointers

Points and Segments (easy)

constructive algorithms, sortings

Points and Segments

graphs

Tricky Function

data structures, divide and conquer, geometry

Guess the Tree

bitmasks, constructive algorithms, dp, greedy, trees

Working out

dp

Police Patrol

greedy, implementation, math, ternary search

Match & Catch

dp, string suffix structures, strings

Checkposts

dfs and similar, graphs, two pointers

Sereja and Sets

dp

Sereja and Squares

binary search, data structures, hashing

Sereja and Two Sequences

data structures, dp

Sereja and Table

bitmasks, greedy

Sereja and Swaps

brute force, sortings

Colored Jenga

dfs and similar, dp, probabilities

Biathlon Track

binary search, brute force, constructive algorithms, data structures, dp

Magic Formulas

math

Bug in Code

binary search, data structures, sortings

Playing the ball

geometry

Cup Trick

data structures

Bug in Code

data structures, graphs, implementation, two pointers

Online Meeting

implementation

Tricky Password

data structures

Big Problems for Organizers

data structures, graphs, trees

Square Table

constructive algorithms, math, probabilities

Cunning Gena

bitmasks, dp, greedy, sortings

Football

constructive algorithms, graphs, implementation

Crash

implementation

Elimination

dp, implementation, math

President's Path

dp, graphs, shortest paths

Population Size

greedy, implementation, math

Booking System

binary search, dp, greedy, implementation

Guess a number!

greedy, implementation, two pointers

Mashmokh and Tokens

binary search, greedy, implementation, math

Mashmokh's Designed Problem

data structures

Mashmokh and Water Tanks

binary search, data structures, greedy, trees, two pointers

Mashmokh and Reverse Operation

combinatorics, divide and conquer

Mashmokh and ACM

combinatorics, dp, number theory

Mashmokh and Numbers

constructive algorithms, number theory

Maze 2D

data structures, divide and conquer

2048

bitmasks, dp

Jeopardy!

greedy, math

E-mail Addresses

implementation

Giving Awards

dfs and similar

Kicker

implementation

Multi-core Processor

implementation

Feed the Golorp

*special problem

A + B Strikes Back

*special problem, brute force, constructive algorithms, dsu, implementation