Regular Bridge

constructive algorithms, graphs, implementation

Vladik and Memorable Trip

dp, implementation

Recover the String

constructive algorithms, greedy, implementation, math

GCD on a grid

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

Build a Tree and That Is It

constructive algorithms, implementation, trees

New Year and Fireworks

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

Flag

brute force, combinatorics, dp, implementation

Let's Play the Words?

data structures, hashing, implementation, math

Expand the Path

brute force, combinatorics, data structures, implementation, math

Credit Card

data structures, dp, greedy, implementation

Vlad and Trouble at MIT

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

Tyler and Strings

combinatorics, data structures, implementation

Innokenty and a Football League

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

Video Cards

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

Inna and Dima

dfs and similar, dp, graphs, implementation

Barcelonian Distance

geometry, implementation

Spy Syndrome 2

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

Fox and Minimal path

bitmasks, constructive algorithms, graphs, implementation, math

Changing Array

greedy, implementation

Two Heaps

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

Haar Features

greedy, implementation

Kyoya and Permutation

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

Minesweeper 1D

dp, implementation

Xenia and Hamming

implementation, math

Accumulator Apex

data structures, implementation, sortings

Rooter's Song

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

Jabber ID

implementation, strings

Numbers Exchange

greedy, implementation, math

Insertion Sort

data structures, dp, implementation, math

Bear and Up-Down

brute force, implementation

Mister B and PR Shifts

data structures, implementation, math

Diana and Liana

greedy, implementation, two pointers

Logging

implementation, strings

Permutation Sum

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

Noise Level

dfs and similar, implementation, math

Washer, Dryer, Folder

greedy, implementation

Bug in Code

data structures, graphs, implementation, two pointers

Before Exam

constructive algorithms, implementation, sortings

Crunching Numbers Just for You

*special problem, implementation

Dependency management

*special problem, graphs, implementation

E-mail Addresses

implementation

Vasya the Architect

implementation

Touchy-Feely Palindromes

*special problem, implementation

Odd-Even Subsequence

binary search, dp, dsu, greedy, implementation

Yet Another Yet Another Task

data structures, dp, implementation, two pointers

Compress Words

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

Captain Flint and Treasure

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

505

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

Berserk And Fireball

constructive algorithms, greedy, implementation, math, two pointers

Omkar and Medians

data structures, greedy, implementation

Subsequences (easy version)

dp, graphs, implementation, shortest paths

Accommodation

brute force, dp, greedy, implementation

Expression Evaluation Error

constructive algorithms, greedy, implementation, math

AB Graph

brute force, constructive algorithms, graphs, greedy, implementation

Cheap Dinner

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

The Strongest Build

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

Robot Collisions

data structures, greedy, implementation, sortings

Orac and Game of Life

dfs and similar, graphs, implementation, shortest paths

Different Arrays

brute force, dp, implementation

Searchlights

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

Cut and Stick

binary search, data structures, greedy, implementation, sortings

Big Brush

constructive algorithms, data structures, greedy, implementation

Reverse

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

Robot in a Hallway

data structures, dp, greedy, implementation, ternary search

Masha-forgetful

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

Balanced Playlist

binary search, data structures, implementation

Time to Run

constructive algorithms, graphs, implementation

Repetitions Decoding

constructive algorithms, implementation, sortings

Koxia and Game

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

Weight the Tree

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

Cyclic MEX

data structures, implementation, math, two pointers

Decreasing Debts

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

Unshuffling a Deck

constructive algorithms, implementation

Nash Matrix

constructive algorithms, dfs and similar, graphs, implementation

Circular Spanning Tree

constructive algorithms, implementation, trees

Linguistics

greedy, implementation, sortings, strings

Non-Palindromic Substring

hashing, implementation, math, strings

Vlad and the Mountains

binary search, data structures, dsu, graphs, implementation, sortings, trees, two pointers

Nene and the Mex Operator

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

No Palindromes

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

Fibonacci Strings

greedy, implementation, math, number theory

Into Blocks (easy version)

data structures, dsu, greedy, implementation, two pointers

Inna and Pink Pony

greedy, implementation

Sum Graph

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

Ehab and another another xor problem

bitmasks, constructive algorithms, implementation, interactive

Segments Removal

data structures, dsu, flows, implementation, two pointers

Fibonacci-ish

brute force, dp, hashing, implementation, math

Stack Sorting

constructive algorithms, data structures, greedy, implementation

Polycarp and Snakes

brute force, implementation

Freedom of Choice

brute force, greedy, implementation

Pinball

binary search, data structures, implementation, math, two pointers

Mars rover

dfs and similar, graphs, implementation, trees

TV Shows

data structures, greedy, implementation, sortings

The World Is Just a Programming Task (Easy Version)

brute force, dp, greedy, implementation

Candy Box (hard version)

greedy, implementation, sortings

Copy of a Copy of a Copy

constructive algorithms, dfs and similar, graphs, implementation, sortings

PLEASE

combinatorics, dp, implementation, math, matrices

Microtransactions (hard version)

binary search, greedy, implementation

Sums of Digits

dp, greedy, implementation

Dima and Containers

constructive algorithms, greedy, implementation