Inflation

binary search, brute force, greedy, math

K-divisible Sum

binary search, constructive algorithms, greedy, math

Strange Beauty

dp, math, number theory, sortings

Unusual Matrix

2-sat, brute force, constructive algorithms

Advertising Agency

combinatorics, math, sortings

Cleaning the Phone

binary search, dp, sortings, two pointers

Ball in Berland

combinatorics, graphs, math

New Year's Number

brute force, dp, math

Odd Divisor

math, number theory

1 2 3 4 ...

dp, math, matrices

What Is It?

constructive algorithms, greedy

Cleaning

data structures, dp, greedy, math

Array Destruction

brute force, constructive algorithms, data structures, greedy, implementation, sortings

Different Divisors

binary search, constructive algorithms, greedy, math, number theory

Puzzle From the Future

greedy

Tiles

combinatorics, dp, fft, math

Strange Set

flows, math

Minimum Path

graphs, shortest paths

Program

data structures, dp, implementation, strings

No More Inversions

constructive algorithms, math

String LCM

brute force, math, number theory, strings

Replacing Elements

greedy, implementation, math, sortings

Moving to the Capital

dfs and similar, dp, graphs, shortest paths

New Year's Puzzle

brute force, dp, graph matchings, greedy, sortings

Correct Placement

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

Even-Odd Game

dp, games, greedy, sortings

Long Jumps

dp, graphs

Fair Division

dp, greedy, math

Cards for Friends

greedy, math

Strange List

brute force, greedy, implementation, math

Strange Partition

greedy, math, number theory

Strange Covering

divide and conquer

Strange Permutation

binary search, combinatorics, data structures, dp, graphs, implementation, two pointers

Strange Housing

constructive algorithms, dfs and similar, graph matchings, graphs, greedy

Strange Shuffle

binary search, brute force, constructive algorithms, interactive

Strange Definition

bitmasks, graphs, hashing, math, number theory

Strange Birthday Party

binary search, dp, greedy, sortings, two pointers

Power Sockets

binary search, data structures, greedy

A Bit Similar

bitmasks, brute force, hashing, string suffix structures, strings, two pointers

Ceil Divisions

brute force, constructive algorithms, math, number theory

Building a Fence

dp, greedy, implementation, two pointers

Red and Blue

dp, greedy

Regular Bracket Sequence

constructive algorithms, greedy

Waste Sorting

greedy, implementation

Similar Sets

data structures, graphs, implementation

Prime Divisors Selection

binary search, greedy, math, number theory

The Robot

brute force, implementation

Road Reform

dsu, graphs, greedy

Plane Tiling

geometry, implementation, math

K and Medians

constructive algorithms, greedy, math

Hobbits

binary search, geometry

Full Turn

geometry, hashing, number theory

Four Segments

greedy

Firecrackers

binary search, sortings

Berpizza

data structures, implementation

Bakery

data structures, dsu

LaIS

data structures, dp, greedy

Distinctive Roots in a Tree

data structures, dfs and similar, dp, trees

Sum of Paths

combinatorics, dp, math

Three Bags

constructive algorithms, greedy

Hills And Valleys

brute force, implementation

Wizard of Orz

constructive algorithms, greedy, math

The Riddle of the Sphinx

binary search, data structures, data structures, interactive

Finding satisfactory solutions

combinatorics, dp, graphs, greedy, math

Song of the Sirens

combinatorics, divide and conquer, hashing, math, string suffix structures, strings

Euclid's nightmare

bitmasks, dfs and similar, dsu, graphs, greedy, math, sortings

Apollo versus Pan

bitmasks, brute force, math

13th Labour of Heracles

data structures, greedy, sortings, trees

Canine poetry

dp, greedy, strings

Last minute enhancements

dp, greedy

Bovine Dilemma

brute force, geometry, math

My Beautiful Madness

data structures, trees

Max Correct Set

bitmasks, dp, math

Plan of Lectures

constructive algorithms, dfs and similar, dsu, graphs, implementation, sortings, trees

Pairs

binary search, constructive algorithms, greedy, two pointers

Busy Robot

implementation

Find The Array

bitmasks, constructive algorithms, greedy

Dungeon

binary search, math

The Treasure of The Segments

binary search, data structures, greedy

Close Tuples (hard version)

binary search, combinatorics, implementation, math, sortings, two pointers

Close Tuples (easy version)

binary search, combinatorics, math, sortings, two pointers

Add to Neighbour and Remove

greedy, math, number theory

Unique Number

brute force, greedy, math

Last Year's Substring

dp, implementation, strings

Favorite Sequence

implementation, two pointers

Mathematical Expression

constructive algorithms, dp, greedy

Water Level

brute force, graphs, greedy, implementation, math

Divide and Summarize

binary search, brute force, data structures, divide and conquer, implementation, sortings

Random Events

dp, math, probabilities

Find the Spruce

brute force, dp, implementation

String Generation

constructive algorithms, greedy

Move and Turn

dp, math

Red-Blue Shuffle

math, probabilities

Range Diameter Sum

data structures, trees

Nim Shortcuts

data structures, games

Flip and Reverse

data structures, graphs, greedy

Latin Square

math, matrices

Glass Half Spilled

dp

Row GCD

math, number theory

XOR-ranges

dp, greedy