Chattering

Vasya and Maximum Matching

dp, trees

The Unbearable Lightness of Weights

dp, math

Familiar Operations

brute force, graphs, math

Triple Flips

constructive algorithms

Linear Congruential Generator

number theory

Putting Boxes Together

data structures

Vasya and Good Sequences

bitmasks, dp

Multicolored Markers

binary search, brute force, math, number theory

Tree with Small Distances

dp, graphs, greedy

Make Square

math

Guess the number

dp, interactive

Make Symmetrical

brute force

Restore Array

constructive algorithms

Order book

combinatorics, data structures, greedy

X-mouse in the Campus

bitmasks, math, number theory

Session in BSU

binary search, dfs and similar, dsu, graph matchings, graphs

Inverse Coloring

combinatorics, dp, math

Company Acquisitions

constructive algorithms, math

Disjoint Triangles

geometry

Colored Cubes

constructive algorithms, implementation, matrices

Recovering BST

brute force, dp, math, number theory, trees

Pisces

data structures, flows, trees

Mobile Phone Network

dfs and similar, dsu, graphs, trees

Down or Right

constructive algorithms, interactive, matrices

Raining season

data structures, divide and conquer, trees

Large Triangle

binary search, geometry, sortings

Sergey's problem

constructive algorithms, graphs

The hat

binary search, interactive

The Films

brute force

The Tree

data structures

The Neutral Zone

brute force, math

The Supersonic Rocket

geometry, hashing, strings

Appropriate Team

bitmasks, math, number theory

Road Projects

dfs and similar, dp, trees

Rest In The Shades

binary search, geometry

Bracket Substring

dp, strings

Passports

dp, implementation

Cycle sort

dsu, math

AB-Strings

constructive algorithms, strings

Tree

fft, graphs, trees

Store

data structures

Mars rover

dfs and similar, graphs, implementation, trees

Allowed Letters

bitmasks, flows, graph matchings, graphs, greedy

Dominant Indices

data structures, dsu, trees

Intercity Travelling

combinatorics, math, probabilities

Mini Metro

dp

Ants

2-sat, data structures, trees

Guess two numbers

binary search, interactive

Pave the Parallelepiped

bitmasks, brute force, combinatorics, math, number theory

Xor-Paths

bitmasks, brute force, dp, meet-in-the-middle

Berland and the Shortest Paths

brute force, dfs and similar, graphs, shortest paths

Median on Segments (General Case Edition)

sortings

Sonya and Bitwise OR

bitmasks, data structures, divide and conquer

Sonya and Ice Cream

binary search, data structures, dp, greedy, shortest paths, trees

Sonya and Matrix

brute force, constructive algorithms, implementation

Abbreviation

dp, hashing, strings

Tree Constructing

constructive algorithms, graphs

Two-Paths

data structures, dp, trees

One Occurrence

data structures, divide and conquer

We Need More Bosses

dfs and similar, graphs, trees

Cards and Joy

dp

Reachability from the Capital

dfs and similar, graphs, greedy

Good Subsegments

data structures

Cycles in product

combinatorics, divide and conquer, trees

Sky Full of Stars

combinatorics, math

Roman Digits

brute force, combinatorics, dp, greedy, math

Cowmpany Cowmpensation

combinatorics, dp, math, trees

Number Clicker

divide and conquer, graphs, meet-in-the-middle, number theory

Game

math

Leaving the Bar

brute force, data structures, geometry, greedy, math, sortings

Tesla

constructive algorithms, implementation

The Moral Dilemma

Nikita and Order Statistics

chinese remainder theorem, fft, math

Compute Power

binary search, dp, greedy

Careful Maneuvering

bitmasks, brute force, geometry

Nastya and King-Shamans

binary search, data structures

Nastya and a Game

brute force, implementation, math

Concise and clear

brute force, greedy, implementation, math

GCD Counting

divide and conquer, dp, dsu, number theory, trees

Flow Control

dfs and similar, dp, greedy, trees

Post Lamps

brute force, greedy

A Trance of Nightfall

dp, geometry, matrices, probabilities

A Shade of Moonlight

binary search, geometry, math, sortings, two pointers

Rain and Umbrellas

dp

Divisibility by 25

brute force, greedy

Oppa Funcan Style Remastered

graphs, math, number theory, shortest paths

Prince's Problem

brute force, data structures, math, number theory, trees

Perfect Encoding

fft, math

AND Graph

bitmasks, dfs and similar, dsu, graphs

Team Players

combinatorics

Isomorphic Strings

hashing, strings

Pencils and Boxes

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

Sand Fortress

binary search, constructive algorithms, math

NN country

binary search, data structures, trees

Arkady and Rectangles

data structures

Elevator

dp, graphs, shortest paths

The Meeting Place Cannot Be Changed

dfs and similar, graphs

Billiard

geometry, number theory

K Paths

combinatorics, data structures, dp, fft, math