Concise and clear

brute force, greedy, implementation, math

Sagheer and Kindergarten

dfs and similar, graphs, implementation, trees

Pairs

dfs and similar, dp, dsu, graphs, implementation, trees

You Are Given Some Letters...

binary search, implementation, math

Once in a casino

constructive algorithms, greedy, implementation, math

Tasty Cookie

binary search, constructive algorithms, greedy, implementation

Information Reform

dp, implementation, trees

Serval and Brain Power

bitmasks, brute force, dp, greedy, implementation, strings

Strange Instructions

data structures, greedy, implementation

Colored Cubes

constructive algorithms, implementation, matrices

Not Splitting

geometry, graphs, greedy, implementation, shortest paths

Farmer John's Favorite Function

brute force, data structures, implementation, math

Magician and Pigs (Hard Version)

binary search, brute force, data structures, implementation

Toy Machine

constructive algorithms, games, implementation

Swedish Heroes

brute force, dp, implementation

Nene vs. Monsters (Hard Version)

brute force, greedy, implementation, math

One-Four Overload

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

Minlexes

dp, greedy, implementation, strings

Misha and Paintings

constructive algorithms, data structures, greedy, implementation, math

Christmas Chocolates

dfs and similar, dp, games, graphs, implementation, math, number theory, shortest paths, trees

Tree Generator™

data structures, implementation, trees

PermuTree (hard version)

bitmasks, dfs and similar, dp, fft, greedy, implementation, math, trees

Fibonacci Additions

brute force, data structures, hashing, implementation, math

Inna and Babies

binary search, data structures, dsu, geometry, implementation

Encoded message

*special problem, implementation

Amanda the Amoeba

graphs, implementation, trees, two pointers

Dasha and Photos

brute force, data structures, dp, implementation

Tricky Interactor

constructive algorithms, implementation, interactive

Kay and Eternity

brute force, implementation, sortings

Two Paths

constructive algorithms, dsu, graphs, implementation

Strange Sorting

implementation, math

Bracket Xoring

constructive algorithms, greedy, implementation, math

Defining Macros

dp, expression parsing, implementation

Timofey and remoduling

brute force, implementation, math, number theory

Intriguing Selection

brute force, constructive algorithms, implementation, interactive, sortings

Vika and Stone Skipping

brute force, implementation, math, number theory

Number Challenge

combinatorics, dp, implementation, math, number theory

Counting Prefixes

combinatorics, constructive algorithms, dp, implementation, math

Playoff Restoration

bitmasks, brute force, hashing, implementation, meet-in-the-middle

Survival of the Weakest (easy version)

binary search, brute force, implementation, math, sortings

Lamps on a Circle

games, implementation, interactive, math

Points Movement

data structures, dp, greedy, implementation, sortings

Super Jaber

dfs and similar, graphs, implementation, shortest paths

Rebrending

brute force, data structures, divide and conquer, implementation

Greedy Shopping

binary search, data structures, divide and conquer, greedy, implementation

Graph and Queries

data structures, dsu, graphs, implementation, trees

Combostone

games, implementation

Two Circles

brute force, data structures, implementation

Deputies

constructive algorithms, graphs, greedy, implementation

Lucky Segments

binary search, implementation, two pointers

Cycle

brute force, dfs and similar, implementation

Shaass and Painter Robot

brute force, implementation, number theory

Shooting Gallery

data structures, implementation

Digits

brute force, implementation, math

Game with Tokens

data structures, games, implementation

Azembler

brute force, implementation

Keen Tree Calculation

binary search, data structures, dp, geometry, graphs, implementation, trees

One Node is Gone

constructive algorithms, implementation, trees

Strange Radiation

binary search, implementation, math

New Year and Cleaning

binary search, implementation

Interactive Factorial Guessing

brute force, games, implementation, interactive

Plane Tiling

geometry, implementation, math

Double Elimination

dp, implementation

Madoka and The First Session

constructive algorithms, flows, graph matchings, graphs, implementation

Vus the Cossack and a Field

divide and conquer, implementation, math

Inverse Transformation

constructive algorithms, implementation, math

Cook and Porridge

binary search, constructive algorithms, data structures, implementation

Volcanoes

binary search, implementation, sortings, two pointers

Hossam and a Letter

brute force, dp, implementation, two pointers

Degree Set

constructive algorithms, graphs, implementation

Traveling in Berland

binary search, data structures, graphs, greedy, implementation

Map

data structures, implementation, sortings

Misha and Palindrome Degree

binary search, combinatorics, implementation

Serval and Music Game

brute force, dp, implementation, math, number theory

Brukhovich and Exams

brute force, greedy, implementation, math, sortings

Caterpillar on a Tree

dfs and similar, graphs, greedy, implementation, sortings, trees

XOR, Tree, and Queries

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

Tree Queries

data structures, dfs and similar, graphs, implementation, trees

Case of a Top Secret

binary search, implementation, math

Coloring

combinatorics, constructive algorithms, implementation, math

Points

combinatorics, data structures, implementation, math, matrices

Reading Books (hard version)

data structures, greedy, implementation, sortings, ternary search, two pointers

Game with Cards

binary search, constructive algorithms, data structures, dp, greedy, implementation

Group Photo

binary search, data structures, implementation, two pointers

Curious Array

brute force, combinatorics, implementation, math

The World Is Just a Programming Task (Hard Version)

implementation

Gojou and Matrix Game

data structures, dp, games, hashing, implementation, math, number theory, sortings

Working routine

data structures, implementation

Cow and Treats

binary search, combinatorics, dp, greedy, implementation, math

Picking Strings

constructive algorithms, implementation, strings

Museums Tour

dp, graphs, implementation

Almost Fault-Tolerant Database

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

Happy New Year

bitmasks, dp, implementation

Add on a Tree: Revolution

constructive algorithms, dfs and similar, implementation, trees

Nene vs. Monsters (Easy Version)

brute force, implementation, math

Nanosoft

binary search, data structures, dp, implementation

Boxes and Balls

dp, implementation, math

Anton and School

bitmasks, constructive algorithms, implementation, math

Mastermind

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

MinimizOR

bitmasks, brute force, data structures, divide and conquer, greedy, implementation, two pointers