Permutations

greedy

Maximize Sum of Digits

*special problem, implementation, math

Queue

constructive algorithms, dp

Anya and Cubes

binary search, bitmasks, brute force, dp, math, meet-in-the-middle

Splitting money

implementation

Turing Tape

implementation

Keyboard Purchase

bitmasks, dp

Testing Robots

implementation

Famil Door and Brackets

dp, strings

Segments Removal

data structures, dsu, flows, implementation, two pointers

Special Segments of Permutation

data structures, divide and conquer, dsu, two pointers

Guilty --- to the kitchen!

greedy, implementation

Portals

data structures, dp, greedy, implementation, sortings

Simple XML

implementation

Video Cards

brute force, data structures, implementation, math, number theory

Rectangular Congruence

constructive algorithms, number theory

Malek Dance Club

combinatorics, math

Ehab and another another xor problem

bitmasks, constructive algorithms, implementation, interactive

Jon and Orbs

dp, math, probabilities

Robot Rapping Results Report

binary search, dp, graphs

Drazil and Tiles

constructive algorithms, greedy

Destiny

data structures, probabilities

Collective Mindsets (easy)

Inversion SwapSort

constructive algorithms, greedy, sortings

Tree with Small Distances

dp, graphs, greedy

Array Without Local Maximums

dp

Encryption (easy)

brute force

Balanced String

dp

Arithmetic Progression

binary search, interactive, number theory, probabilities

DZY Loves Colors

data structures

Potion Brewing Class

dfs and similar, math, number theory, trees

Telepanting

binary search, data structures, dp, sortings

Boundary

brute force, math

Harmony Analysis

constructive algorithms

Convex Shape

constructive algorithms, implementation

Counting Rhyme

dp, math, number theory

Red-Blue Operations (Easy Version)

binary search, greedy, implementation, math

Surrounded

geometry

Spelling Check

hashing, implementation, strings

Bear and Tree Jumps

dfs and similar, dp, trees

Dwarves, Hats and Extrasensory Abilities

binary search, constructive algorithms, geometry, interactive

Cards Sorting

data structures, implementation, sortings

Paired Payment

binary search, brute force, constructive algorithms, dp, flows, graphs, shortest paths

Euclid's nightmare

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

Dima and Bacteria

dsu, graphs, shortest paths

OpenStreetMap

data structures, two pointers

Weird Game

games, greedy

Funny Substrings

data structures, hashing, implementation, matrices, strings

Serega and Fun

data structures

Mahmoud and a xor trip

bitmasks, constructive algorithms, data structures, dfs and similar, dp, math, trees

Optimal Number Permutation

constructive algorithms

Placing Rooks

combinatorics, fft, math

Chladni Figure

brute force, strings

Square Earth?

dfs and similar, greedy, implementation

Orchestra

brute force, implementation

Traffic Lights

implementation

Up the hill

constructive algorithms, implementation

Sum Graph

brute force, constructive algorithms, graphs, implementation, interactive, shortest paths, trees

Paint the Middle

dp, greedy, sortings, two pointers

Bitwise Queries (Hard Version)

bitmasks, constructive algorithms, interactive, math

Great Vova Wall (Version 2)

data structures, implementation

Rectangular Game

number theory

Completely Searching for Inversions

dfs and similar, dp, graphs

Treelabeling

bitmasks, constructive algorithms, dfs and similar, games, greedy, implementation, trees

Solution for Cube

brute force, implementation

Increase Sequence

combinatorics, dp

Ravioli Sort

implementation

Little Artem and Dance

brute force, constructive algorithms, implementation

Inna and Pink Pony

greedy, implementation

Moving Both Hands

dp, graphs, shortest paths

How Many Paths?

dfs and similar, dp, graphs, trees

Innokenty and a Football League

2-sat, graphs, greedy, implementation, shortest paths, strings

Wonderful Randomized Sum

greedy

Polo the Penguin and Houses

combinatorics

The Parade

binary search, greedy

The Tower is Going Home

binary search, two pointers

Lexicography

constructive algorithms, strings

Chamber of Secrets

dfs and similar, shortest paths

Kirk and a Binary String (easy version)

brute force, greedy, strings

Guest Student

math

Beautiful Subarrays

data structures, divide and conquer, strings, trees

Roman Digits

brute force, combinatorics, dp, greedy, math

Tyler and Strings

combinatorics, data structures, implementation

Into Blocks (easy version)

data structures, dsu, greedy, implementation, two pointers

Buses Between Cities

implementation

Rudolph and Mimic

constructive algorithms, implementation, interactive

Rudolf and Subway

constructive algorithms, dfs and similar, graphs, shortest paths

Pictures with Kittens (hard version)

data structures, dp

Elimination

dp, implementation, math

MEX vs MED

math, two pointers

Inna and Huge Candy Matrix

implementation, math

Fibonacci Strings

greedy, implementation, math, number theory

Workout plan

data structures, greedy

No Palindromes

brute force, constructive algorithms, divide and conquer, greedy, hashing, implementation, math, strings

Intercity Travelling

combinatorics, math, probabilities

Number of Triplets

binary search, brute force

Antimatter

dp

Guess the K-th Zero (Hard version)

binary search, constructive algorithms, data structures, interactive

Unusual Entertainment

data structures, dfs and similar, dsu, shortest paths, sortings, trees, two pointers

Minimax

constructive algorithms, greedy, strings