New Year Concert

binary search, data structures, greedy, math, number theory, two pointers

Range and Partition

binary search, constructive algorithms, data structures, greedy, two pointers

Not Escaping

data structures, dp, implementation, shortest paths, two pointers

Replace the Numbers

constructive algorithms, data structures, dsu, implementation

Trader Problem

data structures, dsu, greedy, sortings

Lexicographically Small Enough

brute force, data structures, greedy, strings

ATM and Students

binary search, data structures, two pointers

Frog Traveler

data structures, dfs and similar, dp, graphs, shortest paths, two pointers

Staircases

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

Changing Brackets

constructive algorithms, data structures, dp, greedy

Yet Another Sorting Problem

data structures, math

Pchelyonok and Segments

binary search, data structures, dp, greedy, math

Train Maintenance

brute force, data structures, implementation

Longest Array Deconstruction

data structures, divide and conquer, dp, sortings

The Strongest Build

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

Book

binary search, brute force, data structures, dp, graphs, implementation, sortings

Inconvenient Pairs

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

Non-Decreasing Dilemma

data structures, divide and conquer, math

Two Hundred Twenty One (hard version)

data structures, math

Ezzat and Grid

data structures, dp, greedy

Equilibrium

data structures, dp, greedy

Boring Segments

data structures, sortings, trees, two pointers

Telepanting

binary search, data structures, dp, sortings

Integers Have Friends

binary search, data structures, divide and conquer, math, number theory, two pointers

Array Stabilization (GCD version)

binary search, brute force, data structures, divide and conquer, number theory, two pointers

Funny Substrings

data structures, hashing, implementation, matrices, strings

Erase and Extend (Hard Version)

binary search, data structures, greedy, hashing, string suffix structures, strings, two pointers

Omkar and Medians

data structures, greedy, implementation

Gold Transfer

binary search, data structures, dp, greedy, interactive, trees

Playoff Tournament

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

Kill Anton

brute force, constructive algorithms, data structures, math, strings

Robot Collisions

data structures, greedy, implementation, sortings

Guess the K-th Zero (Hard version)

binary search, constructive algorithms, data structures, interactive

Cut

binary search, data structures, dp, graphs, number theory, two pointers

Cut and Stick

binary search, data structures, greedy, implementation, sortings

Maximize the Remaining String

brute force, data structures, dp, greedy, strings

Travelling Salesman Problem

binary search, data structures, dp, greedy, shortest paths, sortings, two pointers

GCD of an Array

brute force, data structures, hashing, implementation, math, number theory, sortings, two pointers

Old Floppy Drive

binary search, data structures, math

Palindromic Doubles

*special problem, data structures, dp

Cheap Dinner

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

Max Median

binary search, data structures, dp

Skyline Photo

data structures, divide and conquer, dp

Playlist

data structures, dsu, implementation, shortest paths

Painting the Array II

constructive algorithms, data structures, dp, greedy, implementation

Painting the Array I

constructive algorithms, data structures, dp, greedy, implementation

Nezzar and Binary String

data structures, greedy

Cleaning

data structures, dp, greedy, math

LaIS

data structures, dp, greedy

The Treasure of The Segments

binary search, data structures, greedy

Array Partition

binary search, data structures, greedy, two pointers

Rating Compression

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

Xor Tree

binary search, bitmasks, data structures, divide and conquer, dp, trees

Identify the Operations

combinatorics, data structures, dsu, greedy, implementation

Make It Increasing

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

String Reversal

data structures, greedy, strings

Carrots for Rabbits

binary search, data structures, greedy, math, sortings

Rescue Nibel!

combinatorics, data structures, sortings

Pokémon Army (hard version)

data structures, divide and conquer, dp, greedy, implementation

Trash Problem

data structures, implementation

XOR Inverse

bitmasks, data structures, divide and conquer, dp, greedy, math, sortings, strings, trees

Searchlights

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

Discrete Centrifugal Jumps

data structures, dp, graphs

Three Sequences

constructive algorithms, data structures, greedy, math

Fancy Fence

*special problem, data structures, dsu, implementation, math, sortings

Clear the Multiset

data structures, divide and conquer, dp, greedy

Zigzags

brute force, combinatorics, data structures, math, two pointers

Weights Division (easy version)

data structures, dfs and similar, greedy, trees

Two Types of Spells

binary search, data structures, greedy, implementation, math, sortings

Captain Flint and Treasure

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

Choosing flowers

binary search, brute force, data structures, dfs and similar, dp, greedy, sortings, two pointers

Binary Subsequence Rotation

binary search, constructive algorithms, data structures, greedy

Yet Another Yet Another Task

data structures, dp, implementation, two pointers

Multiset

binary search, data structures

Dune II: Battle For Arrakis

*special problem, data structures, greedy, math

Multiple Testcases

binary search, constructive algorithms, data structures, greedy, sortings, two pointers

Robots on a Grid

data structures, dfs and similar, dsu, graphs, greedy, matrices

Three Blocks Palindrome (hard version)

brute force, data structures, dp, two pointers

Present

binary search, bitmasks, constructive algorithms, data structures, math, sortings

World of Darkraft: Battle for Azathoth

brute force, data structures, sortings

Skyscrapers (hard version)

data structures, dp, greedy

Moving Points

data structures, divide and conquer, implementation, sortings

Cow and Fields

binary search, data structures, dfs and similar, graphs, greedy, shortest paths, sortings

1-Trees and Queries

data structures, dfs and similar, shortest paths, trees

Water Balance

data structures, geometry, greedy

String Coloring (hard version)

data structures, dp

Permutation Separation

data structures, divide and conquer

Irreducible Anagrams

binary search, constructive algorithms, data structures, strings, two pointers

Messenger Simulator

data structures

Numbers on Tree

constructive algorithms, data structures, dfs and similar, graphs, greedy, trees

New Year and Conference

binary search, data structures, hashing, sortings

Segment Tree

data structures, dsu, graphs, trees

Let's Play the Words?

data structures, hashing, implementation, math

Portals

data structures, dp, greedy, implementation, sortings

Spaceship Solitaire

data structures, greedy, implementation

Decreasing Debts

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

Beautiful Mirrors

data structures, dp, math, probabilities

Editor

data structures, implementation

The Contest

data structures, dp, greedy

Antenna Coverage

data structures, dp, greedy, sortings