Inna and Sequence

binary search, data structures, dp, trees

Inna and Pink Pony

greedy, implementation

Watching Fireworks is Fun

data structures, dp, math

Subway Innovation

greedy, math, two pointers

Summer Reading

dp, greedy

Broken Monitor

brute force, constructive algorithms, greedy, implementation

Valera and Queries

binary search, data structures

Valera and Fools

dfs and similar, dp, graphs, shortest paths

Sereja and Sets

bitmasks, dfs and similar

Sereja and the Arrangement of Numbers

graphs, greedy, sortings

Dima and Magic Guitar

brute force, implementation, math

Dima and Trap Graph

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

Beautiful Set

brute force, number theory

Free Market

dp, greedy

Two Circles

brute force, data structures, implementation

Petya and Pipes

flows, graphs, shortest paths

Fools and Foolproof Roads

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

Levko and Strings

combinatorics, dp

Levko and Array

binary search, dp

Neatness

constructive algorithms, dfs and similar

Pair of Numbers

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

Dima and Kicks

brute force, dsu, graphs, implementation

Dima and Containers

constructive algorithms, greedy, implementation

Compartments

combinatorics, constructive algorithms, greedy, implementation

Lucky Number Representation

constructive algorithms, dfs and similar, dp

Vasya and Beautiful Arrays

brute force, dp, number theory

Game with Strings

bitmasks, dp, games

Antichain

dp, graph matchings, greedy

Queue

constructive algorithms, dp

Jeff and Permutation

greedy

Jeff and Brackets

dp, matrices

Wrong Floyd

brute force, constructive algorithms, dfs and similar, graphs

Looking for Owls

binary search, data structures, geometry, hashing, sortings

Turtles

dp, matrices

Subset Sums

brute force, data structures

Apple Tree

dfs and similar, number theory, trees

Number Transformation II

greedy, math

Lucky Common Subsequence

dp, strings

Suffix Subgroup

*special problem, strings

Chain Letter

*special problem, dfs and similar, graphs

Counting Fridays

*special problem

Triskaidekaphobia

*special problem

Water Tree

data structures, dfs and similar, graphs, trees

Xenia and Tree

data structures, divide and conquer, trees

Xenia and Dominoes

bitmasks, dfs and similar, dp

Iahub and Xors

data structures

Iahub and Permutations

combinatorics, math

Maximal Area Quadrilateral

brute force, geometry

Divisor Tree

brute force, number theory, trees

Book of Evil

dfs and similar, divide and conquer, dp, trees

Vasily the Bear and Beautiful Strings

combinatorics, math, number theory

Rectangles and Square

brute force, dp

More Reclamation

games

Summer Earnings

binary search, bitmasks, brute force, geometry, sortings

Characteristics of Rectangles

binary search, bitmasks, brute force, implementation, sortings

Binary Key

dp, greedy, implementation

Theft of Blueprints

graphs, math

Students' Revenge

data structures, greedy, sortings

Escaping on Beaveractor

dfs and similar, implementation

The Great Julya Calendar

dp

The Great Julya Calendar

dp

The Evil Temple and the Moving Rocks

constructive algorithms

Graph Reconstruction

constructive algorithms

Axis Walking

bitmasks, combinatorics, constructive algorithms, dp, meet-in-the-middle

Two permutations

data structures

Tournament-graph

constructive algorithms, graphs

Ciel the Commander

constructive algorithms, dfs and similar, divide and conquer, greedy, trees

Kalila and Dimna in the Logging Industry

dp, geometry

Game with Powers

dp, games

Balance

constructive algorithms, dfs and similar, graphs, trees

Ants

brute force, implementation

Good Substrings

string suffix structures

Good Substrings

string suffix structures

Suns and Rays

constructive algorithms, dfs and similar, implementation

Suns and Rays

Suns and Rays

dfs and similar, implementation

Summer Homework

data structures, math

Summer Homework

data structures, math

PE Lesson

dp, math

PE Lesson

dp

PE Lesson

brute force, dp

Tidying Up

flows, graph matchings

Tidying Up

flows

Sereja and Straight Lines

binary search, data structures, geometry, sortings, two pointers

Sereja and Subsequences

data structures, dp

Sereja and Periods

binary search, dfs and similar, strings

Ilya and Two Numbers

constructive algorithms, data structures, dsu, greedy

Ilya and Roads

dp

Biologist

flows

Fetch the Treasure

brute force, data structures, graphs, shortest paths

Cats Transport

data structures, dp

Context Advertising

dp, two pointers

Morning run

binary search, math, two pointers

Polygon

constructive algorithms, geometry

White, Black and White Again

combinatorics, number theory

Optimizer

data structures, greedy, sortings

Playing with String

games

Olya and Graph

combinatorics, math

Minimum Modular

brute force, graphs, math, number theory

Yaroslav and Divisors

data structures