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

Choosing Subtree is Fun

binary search, data structures, dfs and similar, trees, two pointers

Watching Fireworks is Fun

data structures, dp, math

Counting Rectangles is Fun

brute force, divide and conquer, dp

Counting Kangaroos is Fun

binary search, greedy, sortings, two pointers

Subway Innovation

greedy, math, two pointers

Vessels

data structures, dsu, implementation, trees

Hamburgers

binary search, brute force

Fox Dividing Cheese

math, number theory

K-Periodic Array

greedy, implementation, math

Summer Reading

dp, greedy

Broken Monitor

brute force, constructive algorithms, greedy, implementation

Mittens

constructive algorithms, greedy, sortings

Berland Bingo

implementation

Rook, Bishop and King

graphs, math, shortest paths

Valera and Queries

binary search, data structures

Valera and Fools

dfs and similar, dp, graphs, shortest paths

Valera and Elections

dfs and similar, graphs, trees

Valera and Contest

constructive algorithms, implementation, math

Valera and Plates

greedy, implementation

Sereja and Suffixes

data structures, dp

Sereja and Coat Rack

implementation

Sereja and Intervals

combinatorics, dp

Sereja and Sets

bitmasks, dfs and similar

Sereja and the Arrangement of Numbers

graphs, greedy, sortings

Sereja ans Anagrams

binary search, data structures

Sereja and Algorithm

data structures, implementation

Dima and Magic Guitar

brute force, implementation, math

Dima and Trap Graph

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

Dima and Salad

dp

Dima and To-do List

brute force, implementation

Dima and Guards

implementation

The Fibonacci Segment

implementation

Good Number

implementation

Empty Rectangles

divide and conquer, two pointers

Ghd

brute force, math, probabilities

Beautiful Set

brute force, number theory

Free Market

dp, greedy

Matrix

combinatorics, data structures, implementation

Two Circles

brute force, data structures, implementation

Renting Bikes

binary search, greedy

Fixing Typos

greedy, implementation

Fence

brute force, dp

Soroban

implementation

Petya and Pipes

flows, graphs, shortest paths

Fools and Foolproof Roads

data structures, dfs and similar, dsu, graphs, greedy

Insertion Sort

data structures, dp, implementation, math

Petya and Staircases

implementation, sortings

Two Semiknights Meet

greedy, math

Levko and Permutation

constructive algorithms, math, number theory

Levko and Table

constructive algorithms, implementation

Levko and Game

graphs, greedy, shortest paths

Levko and Sets

number theory

Levko and Strings

combinatorics, dp

Levko and Array

binary search, dp

Levko and Array Recovery

greedy, implementation

Neatness

constructive algorithms, dfs and similar

Pair of Numbers

binary search, brute force, data structures, math, two pointers

Prime Number

math, number theory