Trails and Glades

constructive algorithms, dsu, graphs, greedy

Pixels

constructive algorithms, math

Clear Symmetry

constructive algorithms, dp, math

Hexadecimal's theorem

brute force, constructive algorithms, implementation, number theory

Cube Snake

constructive algorithms

Plate Game

constructive algorithms, games, math

Paint Tree

constructive algorithms, divide and conquer, geometry, sortings, trees

Hamming Distance

constructive algorithms, greedy, math, matrices

Cutting Figure

constructive algorithms, graphs, trees

Headquarters

constructive algorithms, math

Mathematical Analysis Rocks!

constructive algorithms, implementation, math

Playing with Superglue

combinatorics, constructive algorithms

Deputies

constructive algorithms, graphs, greedy, implementation

Mysterious numbers - 1

*special problem, constructive algorithms

Discounts

constructive algorithms, greedy, sortings

Suspects

constructive algorithms, data structures, implementation

Terse princess

constructive algorithms, greedy

Insomnia cure

constructive algorithms, implementation, math

Lucky Number 2

constructive algorithms

Help General

constructive algorithms, greedy, implementation

Clearing Up

constructive algorithms, dp, dsu, graphs

Queue

constructive algorithms, greedy, sortings

Zero-One

constructive algorithms, games, greedy

Swaps

constructive algorithms, graphs, greedy

Constants in the language of Shakespeare

constructive algorithms, dp, greedy

Numbers

constructive algorithms, implementation

String

brute force, constructive algorithms, hashing, implementation, string suffix structures, strings

E-reader Display

constructive algorithms, greedy

Two progressions

constructive algorithms, greedy

Hobbits' Party

constructive algorithms, greedy

Before Exam

constructive algorithms, implementation, sortings

Present from Lena

constructive algorithms, implementation

Lucky String

constructive algorithms, strings

Lucky Sorting

constructive algorithms, sortings

Russian Roulette

constructive algorithms, greedy

Help Monks

constructive algorithms

Superset

constructive algorithms, divide and conquer

Grocer's Problem

constructive algorithms, graphs, greedy

Tetris revisited

constructive algorithms, graph matchings, greedy, math

Domino

constructive algorithms, implementation

Sets

constructive algorithms, hashing, implementation

Polycarp's Picture Gallery

constructive algorithms, greedy

Easter Eggs

constructive algorithms, implementation

Shift It!

constructive algorithms

Petya and His Friends

constructive algorithms, math, number theory

Dividing Island

constructive algorithms

Team Arrangement

constructive algorithms, greedy, implementation

Little Frog

constructive algorithms

Disposition

constructive algorithms, math

Black and White

constructive algorithms

Planting Trees

constructive algorithms

Director

constructive algorithms, greedy

Triminoes

constructive algorithms, greedy

Journey

brute force, constructive algorithms, implementation

Strange town

constructive algorithms, math

Safe cracking

brute force, constructive algorithms

3-cycles

constructive algorithms, graphs, greedy

Find Color

constructive algorithms, geometry, implementation, math

Two Paths

constructive algorithms, dsu, graphs, implementation

Tricky and Clever Password

binary search, constructive algorithms, data structures, greedy, hashing, strings

Ant on the Tree

constructive algorithms, dfs and similar, trees

Unordered Subsequence

constructive algorithms, greedy

Multithreading

constructive algorithms

Parquet

combinatorics, constructive algorithms, greedy, implementation

Oranges and Apples

constructive algorithms, sortings

Party

constructive algorithms, graphs, math

Four Segments

brute force, constructive algorithms, geometry, implementation, math

Start of the session

constructive algorithms

Increasing Sequence

constructive algorithms, implementation, math

Greedy Change

constructive algorithms

Obsession with Robots

constructive algorithms, graphs, implementation

Kalevitch and Chess

brute force, constructive algorithms

Longest Regular Bracket Sequence

constructive algorithms, data structures, dp, greedy, sortings, strings

Before an Exam

constructive algorithms, greedy