Equivalent Strings

divide and conquer, hashing, sortings, strings

Lost Numbers

brute force, divide and conquer, interactive, math

Pashmak and Parmida's problem

data structures, divide and conquer, sortings

Painting Fence

divide and conquer, dp, greedy

Creative Snap

binary search, brute force, divide and conquer, math

Code For 1

constructive algorithms, dfs and similar, divide and conquer

Beautiful Array

brute force, data structures, divide and conquer, dp, greedy

Xenia and Tree

data structures, divide and conquer, trees

Book of Evil

dfs and similar, divide and conquer, dp, trees

Ciel the Commander

constructive algorithms, dfs and similar, divide and conquer, greedy, trees

Petya and Array

data structures, divide and conquer, two pointers

Path Queries

divide and conquer, dsu, graphs, sortings, trees

Balanced Removals (Harder)

binary search, constructive algorithms, divide and conquer, greedy, implementation, sortings

Maximum Subsequence

bitmasks, divide and conquer, meet-in-the-middle

Permutations

bitmasks, divide and conquer, math

Points on Plane

constructive algorithms, divide and conquer, geometry, greedy, sortings

Counting Rectangles is Fun

brute force, divide and conquer, dp

The Bakery

binary search, data structures, divide and conquer, dp, two pointers

Imbalanced Array

data structures, divide and conquer, dsu, sortings

Ciel and Gondolas

data structures, divide and conquer, dp

How many trees?

combinatorics, divide and conquer, dp

Tricky Function

data structures, divide and conquer, geometry

Mashmokh and Reverse Operation

combinatorics, divide and conquer

0-1-Tree

dfs and similar, divide and conquer, dp, dsu, trees

Tokitsukaze and Strange Rectangle

data structures, divide and conquer, sortings, two pointers

Merge Sort

constructive algorithms, divide and conquer

Hongcow's Game

bitmasks, divide and conquer, interactive

Minimal Segment Cover

data structures, dfs and similar, divide and conquer, dp, greedy, implementation, trees

High Cry

binary search, bitmasks, combinatorics, data structures, divide and conquer

Special Segments of Permutation

data structures, divide and conquer, dsu, two pointers

Palindrome-less Arrays

combinatorics, divide and conquer, dp

Digits Sequence (Hard Edition)

binary search, divide and conquer, implementation

Addition on Segments

bitmasks, data structures, divide and conquer, dp

Mahmoud and Ehab and the binary string

binary search, divide and conquer, interactive

New Year Tree

data structures, divide and conquer, trees

Beautiful Subarrays

data structures, divide and conquer

Practice

constructive algorithms, divide and conquer, implementation

Till I Collapse

data structures, divide and conquer

Thief in a Shop

divide and conquer, dp, fft, math

One Occurrence

data structures, divide and conquer

Ray in the tube

data structures, divide and conquer, dp, math

Digit Tree

dfs and similar, divide and conquer, dsu, trees

Please, another Queries on Array?

bitmasks, data structures, divide and conquer, math, number theory

Binary Table

bitmasks, brute force, divide and conquer, dp, fft, math

Package Delivery

data structures, divide and conquer, greedy

New Year and Old Subsequence

data structures, divide and conquer, dp, matrices

Alternating Tree

combinatorics, dfs and similar, divide and conquer, dp, probabilities, trees

Vowels

combinatorics, divide and conquer, dp

GCD Counting

divide and conquer, dp, dsu, number theory, trees

Yet Another Minimization Problem

divide and conquer, dp

Kingdom and its Cities

dfs and similar, divide and conquer, dp, graphs, sortings, trees

The Child and Binary Tree

combinatorics, divide and conquer, fft, number theory

Ehab and the Big Finale

constructive algorithms, divide and conquer, graphs, implementation, interactive, trees

Fairy

dfs and similar, divide and conquer, dsu

Minimum Sum

divide and conquer, geometry, sortings

Palindromes in a Tree

bitmasks, data structures, divide and conquer, trees

Lucky Tickets

divide and conquer, dp, fft

Paint Tree

constructive algorithms, divide and conquer, geometry, sortings, trees

One-Based Arithmetic

brute force, dfs and similar, divide and conquer

Ivan and Burgers

data structures, divide and conquer, greedy, math

Close Vertices

data structures, divide and conquer, trees

Stack Exterminable Arrays

data structures, divide and conquer, dp, hashing

Pudding Monsters

data structures, divide and conquer

Goodbye Souvenir

data structures, divide and conquer

Yura and Developers

data structures, divide and conquer

Hot is Cold

bitmasks, data structures, divide and conquer, implementation

The Number of Subpermutations

brute force, data structures, divide and conquer, hashing, math

Superset

constructive algorithms, divide and conquer

Permutation

data structures, divide and conquer, hashing

Find a car

combinatorics, divide and conquer, dp

Abracadabra

divide and conquer

Magic Matrix

brute force, divide and conquer, graphs, matrices, trees

Sum the Fibonacci

bitmasks, divide and conquer, dp, fft, math

Vus the Cossack and a Field

divide and conquer, implementation, math

New Year Shopping

divide and conquer, dp

Extending Set of Points

data structures, divide and conquer, dsu

Number Clicker

divide and conquer, graphs, meet-in-the-middle, number theory

Parking Lot

data structures, divide and conquer

Maze 2D

data structures, divide and conquer

Lena and Queries

data structures, divide and conquer, geometry

Not Quick Transformation

divide and conquer, math

Candies and Stones

divide and conquer, dp

Surprise me!

divide and conquer, math, number theory, trees

Half-decay tree

data structures, divide and conquer, dp, math, probabilities

Divisor Set

divide and conquer, fft, greedy, math, number theory

Pastoral Oddities

data structures, divide and conquer, dsu, math, trees

A Story of One Country (Easy)

brute force, divide and conquer, sortings

Pumping Stations

brute force, dfs and similar, divide and conquer, flows, graphs, greedy, trees

Freezing with Style

binary search, data structures, divide and conquer, trees

Travelling Through the Snow Queen's Kingdom

bitmasks, brute force, divide and conquer, graphs

Formurosa

divide and conquer, dp, expression parsing

Timofey and our friends animals

data structures, divide and conquer, dsu

Quick Tortoise

bitmasks, divide and conquer, dp

SmartGarden

constructive algorithms, divide and conquer

PolandBall and Many Other Balls

combinatorics, divide and conquer, dp, fft, math, number theory

Dynamic Diameter

*special problem, data structures, dfs and similar, divide and conquer, trees

Sherlock's bet to Moriarty

constructive algorithms, data structures, divide and conquer, geometry, graphs, implementation, trees

Cycles in product

combinatorics, divide and conquer, trees

Tavas on the Path

data structures, divide and conquer, trees

Sonya and Bitwise OR

bitmasks, data structures, divide and conquer