Tricky Interactor

constructive algorithms, implementation, interactive

Safe cracking

brute force, constructive algorithms

Button Pressing

bitmasks, constructive algorithms, hashing

Birthday

constructive algorithms, greedy, math

Mike and code of a permutation

constructive algorithms, data structures, graphs, sortings

Swaps

constructive algorithms, graphs, greedy

Neatness

constructive algorithms, dfs and similar

Yaroslav and Algorithm

constructive algorithms

AquaMoon and Wrong Coordinate

constructive algorithms, interactive, math

Playing with Superglue

combinatorics, constructive algorithms

Egor and an RPG game

constructive algorithms, greedy

Yui and Mahjong Set

constructive algorithms, interactive

New Year and Finding Roots

constructive algorithms, implementation, interactive, trees

Three Horses

constructive algorithms, math, number theory

New Year Presents

constructive algorithms, data structures

Chips Puzzle

constructive algorithms, implementation, math

Aztec Catacombs

constructive algorithms

Nauuo and Portals

constructive algorithms

Parquet Re-laying

constructive algorithms

Exact Neighbours (Medium)

constructive algorithms

Balance

constructive algorithms, dfs and similar, graphs, trees

Sum of Matchings

brute force, combinatorics, constructive algorithms, dfs and similar, graph matchings, greedy, math

Hamming Distance

constructive algorithms, greedy, math, matrices

Two Paths

constructive algorithms, dsu, graphs, implementation

Color the Carpet

constructive algorithms

Mashtali: a Space Oddysey

constructive algorithms, dfs and similar, graphs

Mister B and Flight to the Moon

constructive algorithms, graphs

Fox And Polygon

constructive algorithms, divide and conquer

Crop Squares

constructive algorithms, geometry, interactive, math

Inna and Sweet Matrix

constructive algorithms

Japanese Game

constructive algorithms, math

Lost Array

bitmasks, combinatorics, constructive algorithms, dp, math

Dominoes

constructive algorithms, greedy

Madoka and The First Session

constructive algorithms, flows, graph matchings, graphs, implementation

AND-permutations

constructive algorithms

Too Many Constraints

2-sat, constructive algorithms, graphs, implementation

Ants on a Circle

constructive algorithms, math

To Make 1

bitmasks, constructive algorithms, dp, greedy, number theory

Этажи

constructive algorithms

Director

constructive algorithms, greedy

Headquarters

constructive algorithms, math

Mathematical Expression

constructive algorithms, dp, greedy

Swap Pass

constructive algorithms, geometry, sortings

Nezzar and Hidden Permutations

constructive algorithms, dfs and similar, graphs

Rectangular Polyline

constructive algorithms, dp, geometry

Three Swaps

constructive algorithms, dfs and similar, greedy

Challenging Balloons

constructive algorithms

Ilya and Two Numbers

constructive algorithms, data structures, dsu, greedy

Colored Cubes

constructive algorithms, implementation, matrices

Black, White and Grey Tree

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

Triminoes

constructive algorithms, greedy

Renovation

constructive algorithms, greedy, sortings

Merging Two Decks

constructive algorithms, greedy

Biathlon Track

binary search, brute force, constructive algorithms, data structures, dp

Unordered Swaps

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

Startup Funding

binary search, constructive algorithms, data structures, probabilities, two pointers

Mark and the Online Exam

bitmasks, constructive algorithms, interactive, probabilities

New Year and Forgotten Tree

constructive algorithms, flows, graphs

Euclid Guess

constructive algorithms, flows, graph matchings, math, number theory

Equal Reversal

constructive algorithms, graphs, implementation, math

Hidden Bipartite Graph

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

AquaMoon and Permutations

2-sat, brute force, combinatorics, constructive algorithms, graph matchings, graphs

Minegraphed

constructive algorithms, graphs

Наибольший подъем

constructive algorithms, implementation

Quadratic Set

constructive algorithms, hashing, math, number theory

Restoring Map

bitmasks, constructive algorithms, trees

Team Arrangement

constructive algorithms, greedy, implementation

Constants in the language of Shakespeare

constructive algorithms, dp, greedy

Tree-Tac-Toe

constructive algorithms, games, trees

Madhouse (Hard version)

brute force, constructive algorithms, hashing, interactive, math

Knights

constructive algorithms

CNF 2

constructive algorithms, dfs and similar, graphs, greedy

Broken Monitor

brute force, constructive algorithms, greedy, implementation

Lucky Sorting

constructive algorithms, sortings

Divisibility

constructive algorithms, dp, greedy, number theory

Almost All

constructive algorithms, trees

Company Acquisitions

constructive algorithms, math

Walking!

constructive algorithms, greedy

Finals in arithmetic

constructive algorithms, implementation, math

Polycarp's Picture Gallery

constructive algorithms, greedy

Inverse Transformation

constructive algorithms, implementation, math

Santa Clauses and a Soccer Championship

constructive algorithms, dfs and similar, graphs, trees

Cook and Porridge

binary search, constructive algorithms, data structures, implementation

Weights

constructive algorithms, greedy, two pointers

Rearrange

brute force, constructive algorithms, graphs, greedy, sortings

Edge Elimination

constructive algorithms, dfs and similar, dp, trees

Tree Weights

bitmasks, constructive algorithms, data structures, dfs and similar, implementation, math, matrices, number theory, trees

Симметричный амфитеатр

*special problem, constructive algorithms, dp

Magical Permutation

bitmasks, brute force, constructive algorithms, data structures, graphs, math

Nastia and a Beautiful Matrix

binary search, constructive algorithms, dp, greedy

Inversion Composition

constructive algorithms, data structures, greedy

Bracket Xoring

constructive algorithms, greedy, implementation, math

Square Tiling

constructive algorithms, greedy

Winding polygonal line

constructive algorithms, geometry, greedy, math

Alice and Recoloring 2

constructive algorithms, flows, graph matchings, greedy

Coffee Varieties (hard version)

constructive algorithms, graphs, interactive

Exact Neighbours (Easy)

constructive algorithms

Degree Set

constructive algorithms, graphs, implementation

Toy Machine

constructive algorithms, games, implementation

Tricky and Clever Password

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