No Palindromes

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

Nene and the Mex Operator

bitmasks, brute force, constructive algorithms, divide and conquer, dp, greedy, implementation, math

Linguistics

greedy, implementation, sortings, strings

Circular Spanning Tree

constructive algorithms, implementation, trees

Non-Palindromic Substring

hashing, implementation, math, strings

Nash Matrix

constructive algorithms, dfs and similar, graphs, implementation

Unshuffling a Deck

constructive algorithms, implementation

Decreasing Debts

constructive algorithms, data structures, graphs, greedy, implementation, math, two pointers

Cyclic MEX

data structures, implementation, math, two pointers

Weight the Tree

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

Koxia and Game

constructive algorithms, data structures, dfs and similar, dsu, flows, games, graph matchings, graphs, implementation

Repetitions Decoding

constructive algorithms, implementation, sortings

Balanced Playlist

binary search, data structures, implementation

Time to Run

constructive algorithms, graphs, implementation

Masha-forgetful

brute force, constructive algorithms, dp, hashing, implementation, strings

Robot in a Hallway

data structures, dp, greedy, implementation, ternary search

Reverse

bitmasks, constructive algorithms, dfs and similar, implementation, math, strings

Big Brush

constructive algorithms, data structures, greedy, implementation

Cut and Stick

binary search, data structures, greedy, implementation, sortings

Searchlights

binary search, brute force, data structures, dp, implementation, sortings, two pointers

Different Arrays

brute force, dp, implementation

Orac and Game of Life

dfs and similar, graphs, implementation, shortest paths

Robot Collisions

data structures, greedy, implementation, sortings

The Strongest Build

binary search, brute force, data structures, dfs and similar, graphs, greedy, hashing, implementation

Cheap Dinner

brute force, data structures, graphs, greedy, implementation, sortings, two pointers

AB Graph

brute force, constructive algorithms, graphs, greedy, implementation

Expression Evaluation Error

constructive algorithms, greedy, implementation, math

Accommodation

brute force, dp, greedy, implementation

Subsequences (easy version)

dp, graphs, implementation, shortest paths

Omkar and Medians

data structures, greedy, implementation

Berserk And Fireball

constructive algorithms, greedy, implementation, math, two pointers

505

bitmasks, brute force, constructive algorithms, dp, greedy, implementation

Captain Flint and Treasure

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

Compress Words

brute force, hashing, implementation, string suffix structures, strings

Yet Another Yet Another Task

data structures, dp, implementation, two pointers

Odd-Even Subsequence

binary search, dp, dsu, greedy, implementation

Touchy-Feely Palindromes

*special problem, implementation

Vasya the Architect

implementation

E-mail Addresses

implementation

Dependency management

*special problem, graphs, implementation

Crunching Numbers Just for You

*special problem, implementation

Before Exam

constructive algorithms, implementation, sortings

Bug in Code

data structures, graphs, implementation, two pointers

Washer, Dryer, Folder

greedy, implementation

Noise Level

dfs and similar, implementation, math

Permutation Sum

bitmasks, combinatorics, dp, implementation, meet-in-the-middle

Logging

implementation, strings

Diana and Liana

greedy, implementation, two pointers

Mister B and PR Shifts

data structures, implementation, math

Bear and Up-Down

brute force, implementation

Insertion Sort

data structures, dp, implementation, math

Numbers Exchange

greedy, implementation, math

Jabber ID

implementation, strings

Rooter's Song

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

Accumulator Apex

data structures, implementation, sortings

Xenia and Hamming

implementation, math

Minesweeper 1D

dp, implementation

Kyoya and Permutation

binary search, combinatorics, constructive algorithms, greedy, implementation, math

Haar Features

greedy, implementation

Two Heaps

combinatorics, constructive algorithms, greedy, implementation, math, sortings

Changing Array

greedy, implementation

Fox and Minimal path

bitmasks, constructive algorithms, graphs, implementation, math

Spy Syndrome 2

data structures, dp, hashing, implementation, sortings, string suffix structures, strings

Barcelonian Distance

geometry, implementation

Inna and Dima

dfs and similar, dp, graphs, implementation

Video Cards

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

Innokenty and a Football League

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

Tyler and Strings

combinatorics, data structures, implementation

Vlad and Trouble at MIT

dfs and similar, dp, flows, graphs, greedy, implementation, trees

Credit Card

data structures, dp, greedy, implementation

Expand the Path

brute force, combinatorics, data structures, implementation, math

Let's Play the Words?

data structures, hashing, implementation, math

Flag

brute force, combinatorics, dp, implementation

New Year and Fireworks

brute force, data structures, dfs and similar, dp, implementation

Build a Tree and That Is It

constructive algorithms, implementation, trees

Recover the String

constructive algorithms, greedy, implementation, math

Vladik and Memorable Trip

dp, implementation

Regular Bridge

constructive algorithms, graphs, implementation

Game on Axis

combinatorics, dfs and similar, dsu, graphs, implementation

Game of the Rows

brute force, greedy, implementation

GCD on a grid

brute force, dfs and similar, dp, implementation, math, number theory

Mahmoud and Ehab and the xor-MST

bitmasks, dp, graphs, implementation, math

Shuffling Songs

bitmasks, dfs and similar, dp, graphs, hashing, implementation, strings

Johnny and Grandmaster

greedy, implementation, math, sortings

Sum of Progression

brute force, data structures, dp, implementation, math

The Butcher

geometry, greedy, implementation, sortings, two pointers

Power Transmission (Hard Edition)

data structures, geometry, implementation, math

Unlucky Numbers

brute force, dp, greedy, implementation

Professor Higashikata

data structures, dsu, greedy, implementation, strings

Robot Queries

binary search, data structures, dp, implementation

Li Hua and Tree

brute force, data structures, dfs and similar, dp, implementation, trees

Concatenated Multiples

implementation, math

Playlist

data structures, dsu, implementation, shortest paths

Microcycle

data structures, dfs and similar, dsu, graphs, greedy, implementation, sortings, trees

Reverse Sort Sum

constructive algorithms, data structures, greedy, implementation, math, two pointers

White Lines

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

Moving Points

data structures, divide and conquer, implementation, sortings

Birthday Gift

bitmasks, brute force, constructive algorithms, greedy, implementation

Kilani and the Game

dfs and similar, graphs, implementation, shortest paths

Almost Regular Bracket Sequence

implementation