Dima and Containers

constructive algorithms, greedy, implementation

RPD and Rap Sheet (Hard Version)

brute force, constructive algorithms, interactive, math

Omkar and Landslide

binary search, constructive algorithms, data structures, greedy, math

Ski Accidents

constructive algorithms, graphs, greedy

Integer Game

constructive algorithms, games, interactive, math

Tree Queries (Hard Version)

constructive algorithms, dfs and similar, dp, greedy, trees

Discounts

constructive algorithms, greedy, sortings

Lie or Truth

*special problem, constructive algorithms, implementation, sortings

Dasha and Puzzle

constructive algorithms, dfs and similar, graphs, greedy, trees

3-cycles

constructive algorithms, graphs, greedy

One-Way Reform

constructive algorithms, dfs and similar, flows, graphs, greedy

Between

constructive algorithms, dfs and similar, graphs, greedy

Mike and distribution

constructive algorithms, sortings

Tree Compass

constructive algorithms, dfs and similar, greedy, trees

Rooter's Song

constructive algorithms, data structures, geometry, implementation, sortings, two pointers

Santa Claus and a Palindrome

constructive algorithms, data structures, greedy

Nastia Plays with a Tree

constructive algorithms, data structures, dfs and similar, dp, dsu, greedy, implementation, trees

Tablecity

constructive algorithms, implementation

T-shirts Distribution

constructive algorithms, flows, greedy

Red-Blue Operations (Hard Version)

binary search, constructive algorithms, greedy, implementation, math

Excellent Arrays

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

Colors and Intervals

constructive algorithms, data structures, greedy, sortings

Lights

brute force, constructive algorithms, dfs and similar, graphs, greedy, implementation

Domino

constructive algorithms, implementation

Xor of 3

brute force, constructive algorithms, greedy, two pointers

Minimum Sum

constructive algorithms, greedy, math

Make It Connected

binary search, brute force, constructive algorithms, dsu, graphs, greedy, matrices, trees, two pointers

Tests for problem D

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

Ehab's Last Theorem

constructive algorithms, dfs and similar, graphs, greedy

Restoration of string

constructive algorithms, graphs, implementation

Gifts by the List

constructive algorithms, dfs and similar, graphs, trees

K and Medians

constructive algorithms, greedy, math

Too Many Impostors (hard version)

constructive algorithms, implementation, interactive, math

Permutation recovery

constructive algorithms, data structures, dfs and similar, graphs, greedy, math, sortings

Towers

constructive algorithms, dfs and similar, dp, greedy, trees

Anya's Simultaneous Exhibition

constructive algorithms, graphs, greedy, interactive, sortings

Great Grids

2-sat, constructive algorithms, dfs and similar, dsu, graphs

Phoenix and Earthquake

constructive algorithms, dfs and similar, dsu, graphs, greedy, trees

The Beach

constructive algorithms, dfs and similar, graphs, shortest paths

Hemose on the Tree

bitmasks, constructive algorithms, dfs and similar, trees

Delete a Segment

brute force, constructive algorithms, data structures, dp, graphs, sortings, trees, two pointers

A-Z Graph

constructive algorithms, data structures, graphs, hashing

Earth Wind and Fire

constructive algorithms, greedy, math, sortings, two pointers

Chopping Carrots (Hard Version)

brute force, constructive algorithms, data structures, dp, greedy, math, number theory, two pointers

DIY Garland

constructive algorithms, greedy, trees

Tree Modification

brute force, constructive algorithms, dfs and similar, graph matchings, graphs, trees

Disposition

constructive algorithms, math

Arthur and Walls

constructive algorithms, data structures, graphs, greedy, shortest paths

Minimal Diameter Forest

constructive algorithms, dfs and similar, greedy, trees

Changing Brackets

constructive algorithms, data structures, dp, greedy

Network Coverage

binary search, constructive algorithms, data structures, greedy

Flawed Flow

constructive algorithms, flows, graphs, greedy

International Olympiad

constructive algorithms, greedy, implementation, math

Ice cream coloring

constructive algorithms, dfs and similar, greedy

Cactus Wall

constructive algorithms, dfs and similar, graphs, shortest paths

Egor in the Republic of Dagestan

constructive algorithms, dfs and similar, dp, graphs, greedy, shortest paths

Fair Share

constructive algorithms, data structures, dfs and similar, graph matchings, graphs

Minimum Array

binary search, brute force, constructive algorithms, data structures, greedy, hashing, two pointers

Square Root of Permutation

combinatorics, constructive algorithms, dfs and similar, graphs, math

Serval and Shift-Shift-Shift

bitmasks, brute force, constructive algorithms, implementation

Invariance of Tree

constructive algorithms, dfs and similar, greedy, trees

Little Pony and Summer Sun Celebration

constructive algorithms, dfs and similar, graphs

ace5 and Task Order

constructive algorithms, divide and conquer, implementation, interactive, probabilities, sortings

Tree Destruction

constructive algorithms, dfs and similar, graphs, greedy, trees

Modular Sequence

brute force, constructive algorithms, dp, graphs, greedy, math, number theory

Drazil Likes Heap

constructive algorithms, data structures, greedy, implementation

Vladik and Favorite Game

constructive algorithms, dfs and similar, graphs, interactive

Olya and magical square

constructive algorithms, implementation, math

Half Queen Cover

constructive algorithms, math

Flipping Range

constructive algorithms, dp, greedy, number theory

Tesla

constructive algorithms, implementation

Mittens

constructive algorithms, greedy, sortings

Amazing Trick

constructive algorithms, graph matchings, math, probabilities

Wizard's Tour

constructive algorithms, dfs and similar, graphs

Road to 1600

brute force, constructive algorithms

Looksery Party

constructive algorithms, dfs and similar, graphs, greedy

Cooperative Game

constructive algorithms, interactive, number theory

AND-MEX Walk

bitmasks, brute force, constructive algorithms, dfs and similar, dsu, graphs

Beautiful Rectangle

brute force, combinatorics, constructive algorithms, data structures, greedy, math

Nice table

brute force, constructive algorithms, greedy, math

Plan of Lectures

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

Practice

constructive algorithms, divide and conquer, implementation

Decypher the String

bitmasks, chinese remainder theorem, constructive algorithms, interactive, math

Ehab and the Big Finale

constructive algorithms, divide and conquer, graphs, implementation, interactive, trees

Vika and Segments

constructive algorithms, data structures, geometry, two pointers

Folding Strip

constructive algorithms, greedy, strings

Four Points

brute force, constructive algorithms, flows, geometry, greedy, implementation, math, ternary search

Pairs of Pairs

constructive algorithms, dfs and similar, graphs, greedy, trees

Searching Rectangles

binary search, constructive algorithms, interactive

Cost Equilibrium

combinatorics, constructive algorithms, math, sortings

Red-Blue Matrix

brute force, constructive algorithms, implementation, sortings

The Fox and the Complete Tree Traversal

constructive algorithms, dp, implementation, math, trees

Anton and Ira

constructive algorithms, greedy, math

Sonya and Matrix

brute force, constructive algorithms, implementation

Mastermind

constructive algorithms, graph matchings, greedy, implementation, sortings, two pointers

It's a bird! No, it's a plane! No, it's AaParsa!

constructive algorithms, graphs, shortest paths

Johnny and Megan's Necklace

binary search, bitmasks, constructive algorithms, dfs and similar, dsu, graphs

Interactive Treasure Hunt

brute force, constructive algorithms, geometry, interactive, math

King's Puzzle

constructive algorithms

Brackets in Implications

constructive algorithms, greedy, implementation, math