Permutation Transformation

dfs and similar, divide and conquer, implementation

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

Parsa's Humongous Tree

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

Lost Numbers

brute force, divide and conquer, interactive, math

Pashmak and Parmida's problem

data structures, divide and conquer, sortings

Divide and Summarize

binary search, brute force, data structures, divide and conquer, implementation, 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

Beautiful Array

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

Code For 1

constructive algorithms, dfs and similar, divide and conquer

Xenia and Tree

data structures, divide and conquer, trees

Ciel the Commander

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

Path Queries

divide and conquer, dsu, graphs, sortings, trees

Book of Evil

dfs and similar, divide and conquer, dp, trees

Petya and Array

data structures, divide and conquer, two pointers

Maximum Subsequence

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

Clear the Multiset

data structures, divide and conquer, dp, greedy

Pokémon Army (hard version)

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

Balanced Removals (Harder)

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

Moving Points

data structures, divide and conquer, implementation, sortings

XOR Inverse

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

Imbalanced Array

data structures, divide and conquer, dsu, sortings

Ciel and Gondolas

data structures, divide and conquer, dp

Perfect Triples

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

Permutations

bitmasks, divide and conquer, math

The Bakery

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

0-1-Tree

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

Xor Tree

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

Merge Sort

constructive algorithms, divide and conquer

How many trees?

combinatorics, divide and conquer, dp

Points on Plane

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

Counting Rectangles is Fun

brute force, divide and conquer, dp

Tricky Function

data structures, divide and conquer, geometry

Skyline Photo

data structures, divide and conquer, dp

Dogeforces

constructive algorithms, data structures, dfs and similar, divide and conquer, dsu, greedy, sortings, trees

Minimal Segment Cover

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

Permutation Separation

data structures, divide and conquer

Tokitsukaze and Strange Rectangle

data structures, divide and conquer, sortings, two pointers

Mashmokh and Reverse Operation

combinatorics, divide and conquer

Two Different

constructive algorithms, divide and conquer

Special Segments of Permutation

data structures, divide and conquer, dsu, two pointers

Beautiful Subarrays

data structures, divide and conquer, strings, trees

Digits Sequence (Hard Edition)

binary search, divide and conquer, implementation

One Occurrence

data structures, divide and conquer

Fruit Sequences

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

Palindrome-less Arrays

combinatorics, divide and conquer, dp

High Cry

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

Hongcow's Game

bitmasks, divide and conquer, interactive

Fib-tree

brute force, dfs and similar, divide and conquer, number theory, trees

Mahmoud and Ehab and the binary string

binary search, divide and conquer, interactive

Till I Collapse

data structures, divide and conquer

New Year Tree

data structures, divide and conquer, trees

Thief in a Shop

divide and conquer, dp, fft, math

Addition on Segments

bitmasks, data structures, divide and conquer, dp

Tests for problem D

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

Yet Another Minimization Problem

divide and conquer, dp

Kingdom and its Cities

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

Vowels

combinatorics, divide and conquer, dp

Digit Tree

dfs and similar, divide and conquer, dsu, trees

Practice

constructive algorithms, divide and conquer, implementation

Binary Table

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

Greedy Shopping

binary search, data structures, divide and conquer, greedy, implementation

Alternating Tree

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

Please, another Queries on Array?

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

The Child and Binary Tree

combinatorics, divide and conquer, fft, number theory

Ray in the tube

data structures, divide and conquer, dp, math

GCD Counting

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

Package Delivery

data structures, divide and conquer, greedy

Pudding Monsters

data structures, divide and conquer

New Year and Old Subsequence

data structures, divide and conquer, dp, matrices

Fairy

dfs and similar, divide and conquer, dsu

Lucky Tickets

divide and conquer, dp, fft

Ehab and the Big Finale

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

Ivan and Burgers

data structures, divide and conquer, greedy, math

Yurii Can Do Everything

binary search, bitmasks, brute force, constructive algorithms, divide and conquer, two pointers

Partition Game

binary search, data structures, divide and conquer, dp

Three Occurrences

data structures, divide and conquer, hashing, two pointers

Palindromes in a Tree

bitmasks, data structures, divide and conquer, trees

Close Vertices

data structures, divide and conquer, trees

The Number of Subpermutations

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

Goodbye Souvenir

data structures, divide and conquer

Stack Exterminable Arrays

data structures, divide and conquer, dp, hashing

Sum

data structures, divide and conquer, dp, greedy

Minimum Sum

divide and conquer, geometry, sortings

X-OR

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

One-Based Arithmetic

brute force, dfs and similar, divide and conquer

Paint Tree

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

Song of the Sirens

combinatorics, divide and conquer, hashing, math, string suffix structures, strings

Yura and Developers

data structures, divide and conquer

Hot is Cold

bitmasks, data structures, divide and conquer, implementation

Permutation

data structures, divide and conquer, hashing

Superset

constructive algorithms, divide and conquer

Sum the Fibonacci

bitmasks, divide and conquer, dp, fft, math

Find a car

combinatorics, divide and conquer, dp

Magic Matrix

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

Pawns

data structures, divide and conquer, greedy

Extending Set of Points

data structures, divide and conquer, dsu