Shovel Sale

constructive algorithms, math

Sum of Remainders

implementation, math, number theory

Tree Master

brute force, data structures, dfs and similar, trees

Train Hard, Win Easy

constructive algorithms, greedy, math, sortings

Ability To Convert

constructive algorithms, dp, greedy, math, strings

Brain Network (easy)

Pseudorandom Sequence Period

*special problem, implementation, number theory

Winter is here

combinatorics, dp, math, number theory

Time Travel

binary search, graphs, shortest paths

Choosing The Commander

bitmasks, data structures, trees

Games with Rectangle

combinatorics, dp

Unordered Subsequence

constructive algorithms, greedy

Sum of Digits

brute force, constructive algorithms, dp, greedy

Team Work

combinatorics, dp, math

Destruction of a Tree

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

Levko and Array

binary search, dp

Trees and Segments

brute force, data structures, dp, greedy, two pointers

Mike and Foam

bitmasks, combinatorics, dp, math, number theory

Factorial

*special problem, implementation

Array Collapse

data structures, divide and conquer, dp, trees

STL

dfs and similar

Rotate Columns (easy version)

bitmasks, brute force, dp, greedy, sortings

They Have Fooled

brute force, schedules

Permutations

greedy

Splitting money

implementation

Petr#

brute force, data structures, hashing, strings

Queue

constructive algorithms, dp

Maximize Sum of Digits

*special problem, implementation, math

Wet Shark and Blocks

dp, matrices

Testing Robots

implementation

Turing Tape

implementation

Packmen

binary search, dp

Relay Race

dp

Segments Removal

data structures, dsu, flows, implementation, two pointers

Famil Door and Brackets

dp, strings

Keyboard Purchase

bitmasks, dp

Vowels

combinatorics, divide and conquer, dp

Anya and Cubes

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

Guilty --- to the kitchen!

greedy, implementation

Portals

data structures, dp, greedy, implementation, sortings

Special Segments of Permutation

data structures, divide and conquer, dsu, two pointers

Video Cards

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

Malek Dance Club

combinatorics, math

Simple XML

implementation

Ehab and another another xor problem

bitmasks, constructive algorithms, implementation, interactive

Drazil and Tiles

constructive algorithms, greedy

Rectangular Congruence

constructive algorithms, number theory

Robot Rapping Results Report

binary search, dp, graphs

Arithmetic Progression

binary search, interactive, number theory, probabilities

Collective Mindsets (easy)

Jon and Orbs

dp, math, probabilities

Inversion SwapSort

constructive algorithms, greedy, sortings

Encryption (easy)

brute force

Tree with Small Distances

dp, graphs, greedy

Lynyrd Skynyrd

data structures, dfs and similar, dp, math, trees

DZY Loves Colors

data structures

Potion Brewing Class

dfs and similar, math, number theory, trees

Harmony Analysis

constructive algorithms

The LCMs Must be Large

bitmasks, brute force, constructive algorithms, math, number theory

Convex Shape

constructive algorithms, implementation

Telepanting

binary search, data structures, dp, sortings

Array Without Local Maximums

dp

Surrounded

geometry

Destiny

data structures, probabilities

Dwarves, Hats and Extrasensory Abilities

binary search, constructive algorithms, geometry, interactive

Bear and Tree Jumps

dfs and similar, dp, trees

Balanced String

dp

Red-Blue Operations (Easy Version)

binary search, greedy, implementation, math

Euclid's nightmare

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

Spelling Check

hashing, implementation, strings

Paired Payment

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

Cards Sorting

data structures, implementation, sortings

Dima and Bacteria

dsu, graphs, shortest paths

Weird Game

games, greedy

Boundary

brute force, math

Funny Substrings

data structures, hashing, implementation, matrices, strings

Counting Rhyme

dp, math, number theory

Chladni Figure

brute force, strings

Serega and Fun

data structures

Placing Rooks

combinatorics, fft, math

Square Earth?

dfs and similar, greedy, implementation

Optimal Number Permutation

constructive algorithms

Orchestra

brute force, implementation

Up the hill

constructive algorithms, implementation

Rectangular Game

number theory

Mahmoud and a xor trip

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

Bitwise Queries (Hard Version)

bitmasks, constructive algorithms, interactive, math

Solution for Cube

brute force, implementation

Great Vova Wall (Version 2)

data structures, implementation

Traffic Lights

implementation

Paint the Middle

dp, greedy, sortings, two pointers

Treelabeling

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

Innokenty and a Football League

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

Increase Sequence

combinatorics, dp

Little Artem and Dance

brute force, constructive algorithms, implementation

Inna and Pink Pony

greedy, implementation

Polo the Penguin and Houses

combinatorics

Lexicography

constructive algorithms, strings

Sum Graph

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

Kirk and a Binary String (easy version)

brute force, greedy, strings