Permutation Transformation

dfs and similar, divide and conquer, implementation

Lost Numbers

brute force, divide and conquer, interactive, math

a-Good String

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

Maximum Crossings (Hard Version)

data structures, divide and conquer, sortings

Maximum Sum on Even Positions

divide and conquer, dp, greedy, implementation

Parsa's Humongous Tree

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

Divide and Summarize

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

Code For 1

constructive algorithms, dfs and similar, divide and conquer

Practice

constructive algorithms, divide and conquer, implementation

Equivalent Strings

divide and conquer, hashing, sortings, strings

Creative Snap

binary search, brute force, divide and conquer, math

Pashmak and Parmida's problem

data structures, divide and conquer, sortings

Integers Have Friends

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

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

Permutations

bitmasks, divide and conquer, math

Merge Sort

constructive algorithms, divide and conquer

Digits Sequence (Hard Edition)

binary search, divide and conquer, implementation

One-Based Arithmetic

brute force, dfs and similar, divide and conquer

Painting Fence

divide and conquer, dp, greedy

Dr. Evil Underscores

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

Beautiful Array

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

Array Stabilization (GCD version)

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

Balanced Removals (Harder)

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

Imbalanced Array

data structures, divide and conquer, dsu, sortings

Moving Points

data structures, divide and conquer, implementation, sortings

How many trees?

combinatorics, divide and conquer, dp

Counting Rectangles is Fun

brute force, divide and conquer, dp

Hongcow's Game

bitmasks, divide and conquer, interactive

Minimum Sum

divide and conquer, geometry, sortings

Book of Evil

dfs and similar, divide and conquer, dp, trees

XOR Inverse

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

Tokitsukaze and Strange Rectangle

data structures, divide and conquer, sortings, two pointers

Mahmoud and Ehab and the binary string

binary search, divide and conquer, interactive

Ciel the Commander

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

Pokémon Army (hard version)

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

Xor Tree

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

Points on Plane

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

Skyline Photo

data structures, divide and conquer, dp

Beautiful Subarrays

data structures, divide and conquer, strings, trees

Mashmokh and Reverse Operation

combinatorics, divide and conquer

Preorder

combinatorics, divide and conquer, dp, dsu, hashing, sortings, trees

Longest Array Deconstruction

data structures, divide and conquer, dp, sortings

Clear the Multiset

data structures, divide and conquer, dp, greedy

The Bakery

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

Non-Decreasing Dilemma

data structures, divide and conquer, math

Perfect Triples

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

0-1-Tree

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

Minimal Segment Cover

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

Tricky Function

data structures, divide and conquer, geometry

Special Segments of Permutation

data structures, divide and conquer, dsu, two pointers

Permutation Separation

data structures, divide and conquer

Palindrome-less Arrays

combinatorics, divide and conquer, dp

High Cry

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

Addition on Segments

bitmasks, data structures, divide and conquer, dp

Tests for problem D

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

Package Delivery

data structures, divide and conquer, greedy

Paint Tree

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

Maze 2D

data structures, divide and conquer

Dogeforces

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

Two Different

constructive algorithms, divide and conquer

Optimal Insertion

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

Alternating Tree

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

Superset

constructive algorithms, divide and conquer

Xenia and Tree

data structures, divide and conquer, trees

One Occurrence

data structures, divide and conquer

Fruit Sequences

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

Thief in a Shop

divide and conquer, dp, fft, math

New Year Tree

data structures, divide and conquer, trees

Till I Collapse

data structures, divide and conquer

Fib-tree

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

Please, another Queries on Array?

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

GCD Counting

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

Lucky Tickets

divide and conquer, dp, fft

Ehab and the Big Finale

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

Palindromes in a Tree

bitmasks, data structures, divide and conquer, trees

Permutation and Queries

brute force, data structures, divide and conquer, two pointers

Hot is Cold

bitmasks, data structures, divide and conquer, implementation

Magic Matrix

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

Abracadabra

divide and conquer

Anti-Theft Road Planning

bitmasks, constructive algorithms, divide and conquer, greedy, interactive, math

Xor Spanning Tree

divide and conquer, fft, graphs

Yet Another Minimization Problem

divide and conquer, dp

Partition Game

binary search, data structures, divide and conquer, dp

Ray in the tube

data structures, divide and conquer, dp, math

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

Bear and Bowling 4

binary search, data structures, divide and conquer, geometry, ternary search

The Number of Subpermutations

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

Three Occurrences

data structures, divide and conquer, hashing, two pointers

MinimizOR

bitmasks, brute force, data structures, divide and conquer, greedy, implementation, two pointers

Defender of Childhood Dreams

bitmasks, constructive algorithms, divide and conquer

Cats on the Upgrade (easy version)

brute force, data structures, dfs and similar, divide and conquer, dp, graphs, trees

Lena and Queries

data structures, divide and conquer, geometry

Vus the Cossack and a Field

divide and conquer, implementation, math

Virus

data structures, divide and conquer, dsu, graphs

A Story of One Country (Easy)

brute force, divide and conquer, sortings

Half-decay tree

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

Candies and Stones

divide and conquer, dp