Long Path

dp, implementation

Triangle

brute force, geometry, implementation, math

Hamming Triples

implementation, math, two pointers

Hill Climbing

dfs and similar, geometry, trees

Graph Cutting

dfs and similar, graphs

Toy Sum

greedy, implementation, math

Unusual Product

implementation, math

Domino Effect

Gravity Flip

greedy, implementation, sortings

Maze 1D

binary search, greedy, implementation

Minesweeper 1D

dp, implementation

Restore Graph

dfs and similar, graphs, sortings

Marathon

implementation, math

Valera and X

implementation

Two Rooted Trees

data structures, implementation, trees

Beautiful Pairs of Numbers

combinatorics, dp

Strictly Positive Matrix

graphs, math

Upgrading Array

dp, greedy, math, number theory

Searching for Graph

brute force, constructive algorithms, graphs

Trees in a Row

brute force, implementation

Nuts

greedy, math

Olympic Games

math

Roman and Numbers

bitmasks, brute force, combinatorics, dp, number theory

Team

constructive algorithms, greedy, implementation

Sereja and Contests

greedy, implementation, math

Vanya and Cards

implementation, math

Inna and Binary Logic

binary search, bitmasks, data structures

Dima and Bacteria

dsu, graphs, shortest paths

Inna and Huge Candy Matrix

implementation, math

Inna and New Matrix of Candies

brute force, implementation, schedules

Inna and Choose Options

implementation

Fox and Cross

greedy, implementation

Fox and Number Game

greedy, math

Fox and Meteor Shower

geometry

Fox and Perfect Sets

math

Fox and Card Game

games, greedy, sortings

Fox and Minimal path

bitmasks, constructive algorithms, graphs, implementation, math

Fox and Box Accumulation

greedy, sortings

George and Cards

binary search, data structures

George and Interesting Graph

graph matchings

George and Number

greedy, implementation

George and Round

brute force, greedy, two pointers

George and Sleep

implementation

Game with Points

dp, graphs, implementation, shortest paths

Diverse Substrings

dp, strings, two pointers

Fly, freebies, fly!

binary search, brute force, implementation

Second-Price Auction

implementation

Bear in the Field

math, matrices

Bear and Floodlight

bitmasks, dp, geometry

Bear and Prime Numbers

binary search, brute force, data structures, dp, implementation, math, number theory

Bear and Strings

brute force, greedy, implementation, math, strings

Bear and Raspberry

brute force, greedy, implementation

Multitasking

greedy, implementation, sortings, two pointers

Coder

implementation

Vowels

combinatorics, divide and conquer, dp

Antimatter

dp

Propagating tree

data structures, dfs and similar, trees

Volcanoes

binary search, implementation, sortings, two pointers

Milking cows

data structures, greedy

Ksenia and Combinatorics

combinatorics, dp

Ksenia and Pawns

dfs and similar, graphs, implementation, trees

Arithmetic Progression

implementation, sortings

Number Busters

binary search, math

Ksenia and Pan Scales

greedy, implementation

Sereja and Stairs

greedy, implementation, sortings

Sereja and Dima

greedy, implementation, two pointers

Sereja and Dividing

data structures

Sereja and Cinema

combinatorics, math

Sereja and Brackets

data structures, schedules

Sereja and Tree

graphs, implementation

Sereja and Prefixes

binary search, brute force

New Year Cactus

dp

New Year Tree

data structures, divide and conquer, trees

New Year Tree Decorations

geometry, schedules, sortings

New Year Letter

bitmasks, brute force, dp

New Year Ratings Change

greedy, sortings

New Year Present

constructive algorithms, implementation

New Year Candles

implementation

Semifinals

implementation, sortings

Playing with Dice

brute force

Cookie Clicker

dp, geometry

Developing Game

data structures

Captains Mode

bitmasks, dp, games

Preparing for the Contest

binary search, data structures, greedy, sortings

Maze

dfs and similar

I.O.U.

implementation

Lever

implementation, math

Red and Black Tree

dp, implementation, math

Tree and Queries

data structures, dfs and similar, trees

Circling Round Treasures

bitmasks, shortest paths

Maximum Submatrix 2

data structures, dp, implementation, sortings

Divisible by Seven

math, number theory

Inna and Babies

binary search, data structures, dsu, geometry, implementation

Inna and Sequence

binary search, data structures, dp, trees

Inna and Dima

dfs and similar, dp, graphs, implementation

Inna and Nine

combinatorics, greedy

Inna and Pink Pony

greedy, implementation

Making Sequences is Fun

binary search, implementation, math

Collecting Beats is Fun

implementation

Drawing Circles is Fun

combinatorics, geometry