a-Good String

bitmasks, brute force, divide and conquer, dp, implementation

Maximum Sum on Even Positions

divide and conquer, dp, greedy, implementation

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

Dr. Evil Underscores

bitmasks, brute force, dfs and similar, divide and conquer, dp, greedy, strings, trees

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

Ciel the Commander

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

Book of Evil

dfs and similar, divide and conquer, dp, trees

Path Queries

divide and conquer, dsu, graphs, sortings, trees

Petya and Array

data structures, divide and conquer, two pointers

Maximum Subsequence

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

Balanced Removals (Harder)

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

Clear the Multiset

data structures, divide and conquer, dp, greedy

Moving Points

data structures, divide and conquer, implementation, sortings

Permutations

bitmasks, divide and conquer, math

Perfect Triples

bitmasks, brute force, constructive algorithms, divide and conquer, math

Imbalanced Array

data structures, divide and conquer, dsu, sortings

Ciel and Gondolas

data structures, divide and conquer, dp

The Bakery

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

0-1-Tree

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

Counting Rectangles is Fun

brute force, divide and conquer, dp

Points on Plane

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

How many trees?

combinatorics, divide and conquer, dp

Merge Sort

constructive algorithms, divide and conquer

Tricky Function

data structures, divide and conquer, geometry

Tokitsukaze and Strange Rectangle

data structures, divide and conquer, sortings, two pointers

Permutation Separation

data structures, divide and conquer

Mashmokh and Reverse Operation

combinatorics, divide and conquer

Minimal Segment Cover

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

Special Segments of Permutation

data structures, divide and conquer, dsu, two pointers

Digits Sequence (Hard Edition)

binary search, divide and conquer, implementation

Hongcow's Game

bitmasks, divide and conquer, interactive

Palindrome-less Arrays

combinatorics, divide and conquer, dp

Beautiful Subarrays

data structures, divide and conquer, strings, trees

High Cry

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

Mahmoud and Ehab and the binary string

binary search, divide and conquer, interactive

New Year Tree

data structures, divide and conquer, trees

One Occurrence

data structures, divide and conquer

Thief in a Shop

divide and conquer, dp, fft, math

Addition on Segments

bitmasks, data structures, divide and conquer, dp

Till I Collapse

data structures, divide and conquer

Tests for problem D

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

Practice

constructive algorithms, divide and conquer, implementation

Digit Tree

dfs and similar, divide and conquer, dsu, trees

Binary Table

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

Vowels

combinatorics, divide and conquer, dp

Kingdom and its Cities

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

Please, another Queries on Array?

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

Ray in the tube

data structures, divide and conquer, dp, math

Yet Another Minimization Problem

divide and conquer, dp

Alternating Tree

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

Package Delivery

data structures, divide and conquer, greedy

The Child and Binary Tree

combinatorics, divide and conquer, fft, number theory

New Year and Old Subsequence

data structures, divide and conquer, dp, matrices

GCD Counting

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

Fairy

dfs and similar, divide and conquer, dsu

Ehab and the Big Finale

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

Lucky Tickets

divide and conquer, dp, fft

Pudding Monsters

data structures, divide and conquer

Palindromes in a Tree

bitmasks, data structures, divide and conquer, trees

Ivan and Burgers

data structures, divide and conquer, greedy, math

Minimum Sum

divide and conquer, geometry, sortings

Close Vertices

data structures, divide and conquer, trees

Stack Exterminable Arrays

data structures, divide and conquer, dp, hashing

Paint Tree

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

One-Based Arithmetic

brute force, dfs and similar, divide and conquer

The Number of Subpermutations

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

Goodbye Souvenir

data structures, divide and conquer

X-OR

bitmasks, constructive algorithms, divide and conquer, interactive, probabilities

Yura and Developers

data structures, divide and conquer

Hot is Cold

bitmasks, data structures, divide and conquer, implementation

Superset

constructive algorithms, divide and conquer

Permutation

data structures, divide and conquer, hashing

Find a car

combinatorics, divide and conquer, dp

Sum the Fibonacci

bitmasks, divide and conquer, dp, fft, math

Magic Matrix

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

Abracadabra

divide and conquer

Pawns

data structures, divide and conquer, greedy

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

Pastoral Oddities

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

Lena and Queries

data structures, divide and conquer, geometry

Divisor Set

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

Number Clicker

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

Maze 2D

data structures, divide and conquer

Surprise me!

divide and conquer, math, number theory, trees

Dynamic Diameter

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

Parking Lot

data structures, divide and conquer

PolandBall and Many Other Balls

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

Freezing with Style

binary search, data structures, divide and conquer, trees

Sum of Prefix Sums

data structures, divide and conquer, geometry, trees

Pumping Stations

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

Candies and Stones

divide and conquer, dp

Logistical Questions

dfs and similar, divide and conquer, trees