String Journey

data structures, dp, string suffix structures

Lasers and Mirrors

constructive algorithms, math

Candies for Children

brute force, math

Upgrading Cities

dfs and similar, graphs

Lost Root

interactive, probabilities

Politics

flows, graphs

Sophisticated Device

constructive algorithms

Balls and Pockets

data structures

Shrinking Tree

combinatorics, dp

Split the Tree

binary search, data structures, dp, greedy, trees

Detect Robots

data structures, strings

Take Metro

brute force, data structures, graphs

Write The Contest

binary search, dp, math

Jellyfish Nightmare

Tree and XOR

strings, trees

Segments on the Line

binary search, dp

Refactoring

greedy, implementation, strings

Epic Convolution

chinese remainder theorem, fft, math, number theory

New Road Network

constructive algorithms, greedy, math

Electric Scheme

flows, graph matchings

Chips Puzzle

constructive algorithms, implementation, math

Euler tour

constructive algorithms, trees

Distinctification

data structures, dsu, greedy

The Shortest Statement

graphs, shortest paths, trees

Vasya and Big Integers

binary search, data structures, dp, hashing, strings

Moonwalk challenge

data structures, strings, trees

Self-exploration

math

Shady Lady

geometry, math

Ancient civilizations

constructive algorithms, geometry

Space Isaac

hashing, number theory

Last chance

data structures, flows, graph matchings, graphs, trees

DFS

data structures

Grid Sort

implementation

Deduction Queries

data structures, dsu

Speckled Band

data structures, divide and conquer, hashing, string suffix structures, strings

Make It One

bitmasks, combinatorics, dp, math, number theory, shortest paths

Leaf Sets

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

Ray in the tube

data structures, divide and conquer, dp, math

Summer Oenothera Exhibition

data structures

You Are Given a Tree

data structures, dp, trees

Wrap Around

dp, strings

Maximum Matching

bitmasks, brute force, dfs and similar, dp, graphs

Security

data structures, string suffix structures

A Game on Strings

games

Maximum Reduction

combinatorics, data structures, math

Sources and Sinks

bitmasks, brute force, dfs and similar

Relatively Prime Powers

combinatorics, math, number theory

Covered Points

fft, geometry, number theory

Little C Loves 3 III

bitmasks, dp, math

Intervals of Intervals

binary search, data structures, two pointers

Region Separation

combinatorics, dp, number theory, trees

Chip Game

games

Boolean Computer

bitmasks, brute force, fft, math

Hidden Bipartite Graph

binary search, constructive algorithms, dfs and similar, graphs, interactive

Chattering

Vasya and Maximum Matching

dp, trees

Familiar Operations

brute force, graphs, math

Triple Flips

constructive algorithms

Linear Congruential Generator

number theory

Putting Boxes Together

data structures

Make Square

math

Guess the number

dp, interactive

Make Symmetrical

brute force

Restore Array

constructive algorithms

X-mouse in the Campus

bitmasks, math, number theory

Session in BSU

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

Company Acquisitions

constructive algorithms, math

Disjoint Triangles

geometry

Colored Cubes

constructive algorithms, implementation, matrices

Pisces

data structures, flows, trees

Mobile Phone Network

dfs and similar, dsu, graphs, trees

Raining season

data structures, divide and conquer, trees

Large Triangle

binary search, geometry, sortings

Sergey's problem

constructive algorithms, graphs

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

Passports

dp, implementation

Cycle sort

dsu, math

AB-Strings

constructive algorithms, strings

Tree

fft, graphs, trees

Store

data structures

Allowed Letters

bitmasks, flows, graph matchings, graphs, greedy

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

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

Two-Paths

data structures, dp, trees

One Occurrence

data structures, divide and conquer

Good Subsegments

data structures

Cycles in product

combinatorics, divide and conquer, trees

Sky Full of Stars

combinatorics, math

Cowmpany Cowmpensation

combinatorics, dp, math, trees